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[vsnet-grb-info 42457] GRB 260418A: Fermi GBM Final Real-time Localization
by GCN Circulars 18 Apr '26

18 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44335 SUBJECT: GRB 260418A: Fermi GBM Final Real-time Localization DATE: 26/04/18 05:00:17 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply(a)GIOC.nsstc.nasa.gov> The Fermi GBM team reports the detection of a likely SHORT GRB At 04:49:35 UT on 18 Apr 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260418A (trigger 798180580.203356 / 260418201). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 140.6, Dec = 29.3 (J2000 degrees, equivalent to J2000 09h 22m, 29d 18'), with a statistical uncertainty of 18.1 degrees. The angle from the Fermi LAT boresight is 60.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260418201/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260418201/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260418201/… View this GCN Circular online at https://gcn.nasa.gov/circulars/44335. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42456] EP260416a: GMG Optical Observation
by GCN Circulars 18 Apr '26

18 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44334 SUBJECT: EP260416a: GMG Optical Observation DATE: 26/04/18 01:02:53 GMT FROM: Rui-Zhi Li at Yunnan Observatories, CAS <liruizhi(a)ynao.ac.cn> R.-Z. Li, B.-T. Wang, F.-F. Song, J. Mao, J.-G Wang and B. Wang (YNAO, CAS) report: We observed the field of EP260416a (Hu et al., GCN 44307, T0 at 2026-04-16T05:29:32) using the GMG-2.4m telescope at the Lijiang Observatory. The observation began at 2026-04-17T15:58:05, about 34.48 hours after the trigger. The optical counterpart of EP260416a (Ducoin et al., GCN 44310; Li et al., GCN 44315; Hua et al., GCN 44318; Lee et al., GCN 44319; Zheng et al., GCN 44321; Martin-Carrillo et al., GCN 44328) was well detected. The preliminary analysis results are shown as follows: +---------------+------------+----------+--------------+----------------+ | Tmid-T0 [h] | Exp. [s] | Filter | Mag | 5-sigma U.L. | +===============+============+==========+==============+================+ | 34.50 | 180 | r | 20.91 ± 0.07 | 22.3 | +---------------+------------+----------+--------------+----------------+ The given magnitudes are derived based on calibration against Pan-STARRS1 field stars, and are not corrected for the expected Galactic foreground extinction, corresponding to a reddening of E(B-V) = 0.008 mag in the direction of the optical counterpart (Schlafly & Finkbeiner 2011). View this GCN Circular online at https://gcn.nasa.gov/circulars/44334. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42455] Fermi GRB 260417A: Global MASTER-Net observations report
by GCN Circulars 17 Apr '26

17 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44333 SUBJECT: Fermi GRB 260417A: Global MASTER-Net observations report DATE: 26/04/17 21:30:34 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko, G.Antipov, A.Sankovich, Yu.Tselik, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A.Sosnovskij (CrAO), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity), D.Buckley (SAAO), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) MASTER-OAFA robotic telescope [1] located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 260417A ( Fermi GBM team, GCN 44317) errorbox 14312 sec after notice time and 14368 sec after trigger time at 2026-04-17 04:09:33 UT, with upper limit up to 19.8 mag. The observations began at zenith distance = 45 deg. The sun altitude is -68.6 deg. MASTER-OAGH robotic telescope located in Mexico (OAGH National Institute for Astrophysics, Optics and Electronics) started inspect of the Fermi GRB 260417A errorbox 29871 sec after notice time and 29926 sec after trigger time at 2026-04-17 08:28:52 UT, with upper limit up to 19.2 mag. The observations began at zenith distance = 57 deg. The sun altitude is -45.3 deg. The galactic latitude b = 15 deg., longitude l = 0 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3255373 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 740 | 2026-04-17 00:21:24 | MASTER- | (16h 47m 57.82s , -19d 41m 25.5s) | C | 120 | 18.4 | 870 | 2026-04-17 00:23:35 | MASTER- | (16h 47m 57.86s , -19d 41m 30.5s) | C | 120 | 17.7 | 982 | 2026-04-17 00:25:57 | MASTER- | (16h 41m 27.04s , -19d 45m 05.5s) | C | 60 | 16.7 | 1061 | 2026-04-17 00:27:16 | MASTER- | (16h 38m 52.56s , -21d 03m 50.4s) | C | 60 | 17.4 | 1135 | 2026-04-17 00:28:30 | MASTER- | (16h 52m 35.98s , -19d 46m 01.7s) | C | 60 | 18.1 | 1886 | 2026-04-17 00:41:00 | MASTER- | (16h 48m 15.35s , -17d 09m 21.3s) | C | 60 | 16.8 | 1966 | 2026-04-17 00:42:21 | MASTER- | (16h 37m 18.54s , -17d 09m 12.5s) | C | 60 | 17.6 | 2807 | 2026-04-17 00:56:22 | MASTER- | (16h 41m 21.64s , -15d 53m 39.3s) | C | 60 | 17.0 | 2892 | 2026-04-17 00:57:46 | MASTER- | (16h 46m 18.69s , -23d 39m 40.4s) | C | 60 | 17.6 | 2970 | 2026-04-17 00:59:05 | MASTER- | (16h 52m 17.13s , -15d 52m 05.1s) | C | 60 | 18.4 | 4185 | 2026-04-17 01:19:20 | MASTER- | (16h 59m 10.68s , -17d 13m 44.6s) | C | 60 | 16.9 | 5170 | 2026-04-17 01:35:44 | MASTER- | (16h 46m 07.39s , -14d 39m 25.0s) | C | 60 | 17.8 | 5246 | 2026-04-17 01:37:01 | MASTER- | (16h 45m 26.27s , -25d 02m 33.4s) | C | 60 | 18.4 | 5924 | 2026-04-17 01:48:19 | MASTER- | (17h 06m 41.90s , -18d 34m 04.5s) | C | 60 | 18.1 | 14398 | 2026-04-17 04:09:33 | MASTER-OAFA | (16h 29m 03.49s , -19d 43m 08.6s) | C | 60 | 19.5 | 14458 | 2026-04-17 04:09:33 | MASTER-OAFA | (16h 29m 03.49s , -19d 43m 08.6s) | C | 180 | 19.8 | Coadd 14552 | 2026-04-17 04:12:06 | MASTER-OAFA | (16h 28m 56.24s , -19d 43m 02.7s) | C | 60 | 19.5 | 14779 | 2026-04-17 04:15:54 | MASTER-OAFA | (16h 38m 39.66s , -23d 31m 48.1s) | C | 60 | 19.5 | 14839 | 2026-04-17 04:15:54 | MASTER-OAFA | (16h 38m 39.65s , -23d 31m 48.1s) | C | 180 | 19.8 | Coadd 14933 | 2026-04-17 04:18:28 | MASTER-OAFA | (16h 38m 41.76s , -23d 32m 12.6s) | C | 60 | 19.5 | 15084 | 2026-04-17 04:20:58 | MASTER-OAFA | (16h 32m 49.20s , -21d 38m 08.4s) | C | 60 | 19.3 | 15144 | 2026-04-17 04:20:58 | MASTER-OAFA | (16h 32m 49.20s , -21d 38m 08.4s) | C | 180 | 19.8 | Coadd 15160 | 2026-04-17 04:22:14 | MASTER-OAFA | (16h 41m 19.99s , -21d 39m 40.4s) | C | 60 | 19.2 | 15220 | 2026-04-17 04:22:14 | MASTER-OAFA | (16h 41m 19.99s , -21d 39m 40.4s) | C | 180 | 19.6 | Coadd 15235 | 2026-04-17 04:23:29 | MASTER-OAFA | (16h 32m 50.94s , -21d 39m 03.8s) | C | 60 | 19.4 | 15310 | 2026-04-17 04:24:45 | MASTER-OAFA | (16h 41m 23.57s , -21d 37m 54.0s) | C | 60 | 19.3 | 15386 | 2026-04-17 04:26:00 | MASTER-OAFA | (16h 32m 46.94s , -21d 38m 37.5s) | C | 60 | 19.5 | 16850 | 2026-04-17 04:50:25 | MASTER-OAFA | (16h 28m 56.55s , -19d 42m 02.5s) | C | 60 | 19.3 | 16925 | 2026-04-17 04:51:40 | MASTER-OAFA | (16h 29m 02.98s , -19d 43m 01.7s) | C | 60 | 18.9 | 16985 | 2026-04-17 04:51:40 | MASTER-OAFA | (16h 29m 02.97s , -19d 43m 01.8s) | C | 180 | 18.1 | Coadd 16998 | 2026-04-17 04:52:53 | MASTER-OAFA | (16h 28m 57.16s , -19d 43m 59.2s) | C | 60 | 16.6 | 17301 | 2026-04-17 04:57:55 | MASTER-OAFA | (16h 38m 42.29s , -23d 30m 44.7s) | C | 60 | 19.3 | 17375 | 2026-04-17 04:59:10 | MASTER-OAFA | (16h 38m 36.15s , -23d 31m 34.8s) | C | 60 | 19.3 | 17435 | 2026-04-17 04:59:10 | MASTER-OAFA | (16h 38m 36.15s , -23d 31m 34.8s) | C | 180 | 19.7 | Coadd 17453 | 2026-04-17 05:00:27 | MASTER-OAFA | (16h 38m 35.44s , -23d 30m 32.8s) | C | 60 | 19.3 | 17754 | 2026-04-17 05:05:29 | MASTER-OAFA | (16h 41m 22.90s , -21d 36m 58.6s) | C | 60 | 19.2 | 17831 | 2026-04-17 05:06:46 | MASTER-OAFA | (16h 41m 22.86s , -21d 37m 58.9s) | C | 60 | 19.3 | 17891 | 2026-04-17 05:06:46 | MASTER-OAFA | (16h 41m 22.86s , -21d 37m 58.9s) | C | 180 | 19.2 | Coadd 17908 | 2026-04-17 05:08:03 | MASTER-OAFA | (16h 41m 25.06s , -21d 36m 28.2s) | C | 60 | 18.8 | 17984 | 2026-04-17 05:09:18 | MASTER-OAFA | (16h 32m 42.35s , -21d 36m 55.9s) | C | 60 | 18.8 | 18044 | 2026-04-17 05:09:18 | MASTER-OAFA | (16h 32m 42.34s , -21d 36m 55.9s) | C | 180 | 19.4 | Coadd 18060 | 2026-04-17 05:10:35 | MASTER-OAFA | (16h 32m 43.80s , -21d 35m 53.7s) | C | 60 | 18.6 | 18136 | 2026-04-17 05:11:50 | MASTER-OAFA | (16h 32m 49.52s , -21d 36m 53.1s) | C | 60 | 19.2 | 19599 | 2026-04-17 05:36:13 | MASTER-OAFA | (16h 28m 58.57s , -19d 41m 32.5s) | C | 60 | 14.5 | 19676 | 2026-04-17 05:37:31 | MASTER-OAFA | (16h 28m 58.56s , -19d 43m 06.6s) | C | 60 | 19.1 | 19736 | 2026-04-17 05:37:31 | MASTER-OAFA | (16h 28m 58.56s , -19d 43m 06.6s) | C | 180 | 19.5 | Coadd 19751 | 2026-04-17 05:38:46 | MASTER-OAFA | (16h 29m 01.46s , -19d 41m 18.4s) | C | 60 | 18.9 | 20056 | 2026-04-17 05:43:51 | MASTER-OAFA | (16h 38m 36.75s , -23d 31m 41.7s) | C | 60 | 18.9 | 20131 | 2026-04-17 05:45:06 | MASTER-OAFA | (16h 38m 41.80s , -23d 31m 32.2s) | C | 60 | 19.0 | 20191 | 2026-04-17 05:45:06 | MASTER-OAFA | (16h 38m 41.80s , -23d 31m 32.2s) | C | 180 | 19.3 | Coadd 20206 | 2026-04-17 05:46:21 | MASTER-OAFA | (16h 38m 38.94s , -23d 29m 52.9s) | C | 60 | 19.3 | 20509 | 2026-04-17 05:51:24 | MASTER-OAFA | (16h 41m 20.29s , -21d 35m 43.1s) | C | 60 | 14.1 | 20584 | 2026-04-17 05:52:39 | MASTER-OAFA | (16h 41m 24.57s , -21d 36m 41.8s) | C | 60 | 15.4 | 20659 | 2026-04-17 05:53:54 | MASTER-OAFA | (16h 41m 19.16s , -21d 37m 41.1s) | C | 60 | 18.4 | 20734 | 2026-04-17 05:55:09 | MASTER-OAFA | (16h 32m 48.78s , -21d 37m 05.4s) | C | 60 | 19.2 | 20794 | 2026-04-17 05:55:09 | MASTER-OAFA | (16h 32m 48.80s , -21d 37m 05.3s) | C | 180 | 18.4 | Coadd 20812 | 2026-04-17 05:56:27 | MASTER-OAFA | (16h 32m 45.89s , -21d 35m 38.2s) | C | 60 | 18.1 | 20888 | 2026-04-17 05:57:43 | MASTER-OAFA | (16h 32m 45.82s , -21d 37m 12.7s) | C | 60 | 16.2 | 22370 | 2026-04-17 06:22:25 | MASTER-OAFA | (16h 28m 53.83s , -19d 42m 20.8s) | C | 60 | 19.1 | 22445 | 2026-04-17 06:23:39 | MASTER-OAFA | (16h 28m 54.52s , -19d 41m 20.3s) | C | 60 | 18.6 | 22526 | 2026-04-17 06:25:01 | MASTER-OAFA | (16h 28m 59.87s , -19d 42m 20.3s) | C | 60 | 18.4 | 22604 | 2026-04-17 06:26:18 | MASTER-OAFA | (16h 38m 35.62s , -23d 31m 33.0s) | C | 60 | 17.6 | 22682 | 2026-04-17 06:27:36 | MASTER-OAFA | (16h 38m 43.18s , -23d 31m 05.7s) | C | 60 | 15.2 | 29957 | 2026-04-17 08:28:52 | MASTER-OAGH | (16h 36m 33.19s , -19d 47m 23.6s) | C | 60 | 18.9 | 29957 | 2026-04-17 08:28:52 | MASTER-OAGH | (16h 37m 50.69s , -20d 20m 45.0s) | C | 60 | 18.7 | 30029 | 2026-04-17 08:30:04 | MASTER-OAGH | (16h 44m 56.42s , -19d 48m 38.0s) | C | 60 | 18.8 | 30029 | 2026-04-17 08:30:04 | MASTER-OAGH | (16h 46m 13.73s , -20d 22m 00.2s) | C | 60 | 18.5 | 30167 | 2026-04-17 08:32:21 | MASTER-OAGH | (16h 52m 42.81s , -19d 47m 51.8s) | C | 60 | 18.7 | 30167 | 2026-04-17 08:32:21 | MASTER-OAGH | (16h 53m 59.94s , -20d 21m 15.2s) | C | 60 | 18.5 | 30238 | 2026-04-17 08:33:33 | MASTER-OAGH | (17h 01m 06.21s , -19d 49m 06.7s) | C | 60 | 18.6 | 30238 | 2026-04-17 08:33:33 | MASTER-OAGH | (17h 02m 23.12s , -20d 22m 30.8s) | C | 60 | 18.4 | 30368 | 2026-04-17 08:35:42 | MASTER-OAGH | (16h 41m 21.49s , -17d 53m 37.9s) | C | 60 | 19.2 | 30368 | 2026-04-17 08:35:42 | MASTER-OAGH | (16h 42m 38.31s , -18d 26m 58.0s) | C | 60 | 18.9 | 30439 | 2026-04-17 08:36:54 | MASTER-OAGH | (16h 49m 40.61s , -17d 54m 51.2s) | C | 60 | 19.0 | 30439 | 2026-04-17 08:36:54 | MASTER-OAGH | (16h 50m 57.29s , -18d 28m 12.0s) | C | 60 | 18.7 | 30579 | 2026-04-17 08:39:13 | MASTER-OAGH | (16h 36m 25.99s , -19d 46m 31.3s) | C | 60 | 19.0 | 30579 | 2026-04-17 08:39:13 | MASTER-OAGH | (16h 37m 43.64s , -20d 19m 50.6s) | C | 60 | 18.7 | 30651 | 2026-04-17 08:40:26 | MASTER-OAGH | (16h 45m 03.36s , -19d 47m 45.4s) | C | 60 | 18.9 | 30651 | 2026-04-17 08:40:26 | MASTER-OAGH | (16h 46m 20.86s , -20d 21m 05.7s) | C | 60 | 18.6 | 30789 | 2026-04-17 08:42:43 | MASTER-OAGH | (16h 52m 35.27s , -19d 46m 58.1s) | C | 60 | 18.6 | 30789 | 2026-04-17 08:42:43 | MASTER-OAGH | (16h 53m 52.67s , -20d 20m 19.7s) | C | 60 | 18.3 | 30860 | 2026-04-17 08:43:55 | MASTER-OAGH | (17h 01m 11.22s , -19d 48m 13.0s) | C | 60 | 18.6 | 30860 | 2026-04-17 08:43:55 | MASTER-OAGH | (17h 02m 28.42s , -20d 21m 35.4s) | C | 60 | 18.5 | 31050 | 2026-04-17 08:47:05 | MASTER-OAGH | (16h 41m 16.84s , -17d 52m 41.9s) | C | 60 | 19.1 | 31050 | 2026-04-17 08:47:05 | MASTER-OAGH | (16h 42m 34.04s , -18d 26m 00.5s) | C | 60 | 18.9 | 31122 | 2026-04-17 08:48:17 | MASTER-OAGH | (16h 49m 47.00s , -17d 53m 56.4s) | C | 60 | 19.1 | 31122 | 2026-04-17 08:48:17 | MASTER-OAGH | (16h 51m 04.07s , -18d 27m 15.7s) | C | 60 | 18.6 | 31260 | 2026-04-17 08:50:34 | MASTER-OAGH | (16h 36m 26.98s , -19d 46m 35.0s) | C | 60 | 19.0 | 31260 | 2026-04-17 08:50:34 | MASTER-OAGH | (16h 37m 44.96s , -20d 19m 52.8s) | C | 60 | 18.7 | 31331 | 2026-04-17 08:51:45 | MASTER-OAGH | (16h 45m 02.69s , -19d 47m 50.4s) | C | 60 | 18.8 | 31331 | 2026-04-17 08:51:46 | MASTER-OAGH | (16h 46m 20.56s , -20d 21m 09.2s) | C | 60 | 18.7 | 31468 | 2026-04-17 08:54:03 | MASTER-OAGH | (16h 52m 35.52s , -19d 47m 03.7s) | C | 60 | 18.9 | 31468 | 2026-04-17 08:54:03 | MASTER-OAGH | (16h 53m 53.26s , -20d 20m 23.4s) | C | 60 | 18.6 | 31539 | 2026-04-17 08:55:14 | MASTER-OAGH | (17h 01m 10.49s , -19d 48m 19.4s) | C | 60 | 18.5 | 31539 | 2026-04-17 08:55:14 | MASTER-OAGH | (17h 02m 28.05s , -20d 21m 39.9s) | C | 60 | 18.3 | 31730 | 2026-04-17 08:58:25 | MASTER-OAGH | (16h 41m 15.86s , -17d 52m 46.1s) | C | 60 | 19.1 | 31730 | 2026-04-17 08:58:25 | MASTER-OAGH | (16h 42m 33.35s , -18d 26m 03.0s) | C | 60 | 18.8 | 31802 | 2026-04-17 08:59:37 | MASTER-OAGH | (16h 49m 46.34s , -17d 54m 01.2s) | C | 60 | 19.1 | 31802 | 2026-04-17 08:59:37 | MASTER-OAGH | (16h 51m 03.72s , -18d 27m 18.9s) | C | 60 | 18.7 | 31941 | 2026-04-17 09:01:56 | MASTER-OAGH | (16h 36m 25.67s , -19d 46m 37.8s) | C | 60 | 19.1 | 31942 | 2026-04-17 09:01:56 | MASTER-OAGH | (16h 37m 44.02s , -20d 19m 54.4s) | C | 60 | 18.7 | 32013 | 2026-04-17 09:03:08 | MASTER-OAGH | (16h 45m 01.71s , -19d 47m 54.4s) | C | 60 | 18.9 | 32013 | 2026-04-17 09:03:08 | MASTER-OAGH | (16h 46m 19.93s , -20d 21m 11.7s) | C | 60 | 18.6 | 32203 | 2026-04-17 09:06:18 | MASTER-OAGH | (16h 52m 34.62s , -19d 47m 08.4s) | C | 60 | 18.8 | 32203 | 2026-04-17 09:06:18 | MASTER-OAGH | (16h 53m 52.79s , -20d 20m 26.6s) | C | 60 | 18.5 | 32275 | 2026-04-17 09:07:29 | MASTER-OAGH | (17h 01m 10.22s , -19d 48m 25.0s) | C | 60 | 18.6 | 32275 | 2026-04-17 09:07:30 | MASTER-OAGH | (17h 02m 28.23s , -20d 21m 43.8s) | C | 60 | 18.5 | 32413 | 2026-04-17 09:09:48 | MASTER-OAGH | (16h 41m 15.97s , -17d 52m 49.5s) | C | 60 | 19.1 | 32413 | 2026-04-17 09:09:48 | MASTER-OAGH | (16h 42m 33.77s , -18d 26m 05.1s) | C | 60 | 18.9 | 32485 | 2026-04-17 09:11:00 | MASTER-OAGH | (16h 49m 46.18s , -17d 54m 05.0s) | C | 60 | 18.8 | 32485 | 2026-04-17 09:11:00 | MASTER-OAGH | (16h 51m 03.92s , -18d 27m 21.4s) | C | 60 | 18.5 | 32556 | 2026-04-17 09:12:11 | MASTER-OAGH | (16h 36m 25.00s , -19d 48m 39.6s) | C | 60 | 18.7 | 32556 | 2026-04-17 09:12:11 | MASTER-OAGH | (16h 37m 43.65s , -20d 21m 55.1s) | C | 60 | 18.6 | 32628 | 2026-04-17 09:13:23 | MASTER-OAGH | (16h 45m 01.47s , -19d 48m 46.4s) | C | 60 | 18.6 | 32628 | 2026-04-17 09:13:23 | MASTER-OAGH | (16h 46m 20.00s , -20d 22m 02.6s) | C | 60 | 18.4 | 32700 | 2026-04-17 09:14:35 | MASTER-OAGH | (16h 48m 58.70s , -21d 42m 47.7s) | C | 60 | 18.8 | 32700 | 2026-04-17 09:14:35 | MASTER-OAGH | (16h 50m 17.92s , -22d 16m 05.3s) | C | 60 | 18.4 | 32771 | 2026-04-17 09:15:46 | MASTER-OAGH | (16h 57m 38.81s , -21d 41m 35.9s) | C | 60 | 18.5 | 32771 | 2026-04-17 09:15:46 | MASTER-OAGH | (16h 58m 57.88s , -22d 14m 54.5s) | C | 60 | 18.4 | 32844 | 2026-04-17 09:16:58 | MASTER-OAGH | (16h 52m 34.06s , -19d 48m 12.2s) | C | 60 | 18.9 | 32844 | 2026-04-17 09:16:58 | MASTER-OAGH | (16h 53m 52.48s , -20d 21m 29.1s) | C | 60 | 18.5 | 32915 | 2026-04-17 09:18:10 | MASTER-OAGH | (17h 01m 04.38s , -19d 47m 28.3s) | C | 60 | 18.6 | 32915 | 2026-04-17 09:18:10 | MASTER-OAGH | (17h 02m 22.65s , -20d 20m 46.1s) | C | 60 | 18.5 | 32987 | 2026-04-17 09:19:22 | MASTER-OAGH | (16h 32m 33.11s , -21d 42m 33.0s) | C | 60 | 18.7 | 32987 | 2026-04-17 09:19:22 | MASTER-OAGH | (16h 33m 52.63s , -22d 15m 48.3s) | C | 60 | 18.5 | 33060 | 2026-04-17 09:20:35 | MASTER-OAGH | (16h 41m 17.47s , -21d 42m 27.3s) | C | 60 | 18.9 | 33060 | 2026-04-17 09:20:35 | MASTER-OAGH | (16h 42m 36.89s , -22d 15m 43.2s) | C | 60 | 18.7 | 33131 | 2026-04-17 09:21:46 | MASTER-OAGH | (16h 41m 17.42s , -17d 53m 13.2s) | C | 60 | 18.9 | 33132 | 2026-04-17 09:21:46 | MASTER-OAGH | (16h 42m 35.50s , -18d 26m 27.3s) | C | 60 | 18.9 | 33203 | 2026-04-17 09:22:58 | MASTER-OAGH | (16h 49m 41.56s , -17d 54m 40.7s) | C | 60 | 19.0 | 33203 | 2026-04-17 09:22:58 | MASTER-OAGH | (16h 50m 59.53s , -18d 27m 55.6s) | C | 60 | 18.6 | 33275 | 2026-04-17 09:24:10 | MASTER-OAGH | (16h 36m 29.72s , -19d 46m 57.4s) | C | 60 | 18.9 | 33275 | 2026-04-17 09:24:10 | MASTER-OAGH | (16h 37m 48.54s , -20d 20m 11.6s) | C | 60 | 18.6 | 33411 | 2026-04-17 09:26:25 | MASTER-OAGH | (16h 44m 54.82s , -19d 46m 58.7s) | C | 60 | 18.8 | 33411 | 2026-04-17 09:26:25 | MASTER-OAGH | (16h 46m 13.61s , -20d 20m 13.5s) | C | 60 | 18.5 | 33482 | 2026-04-17 09:27:37 | MASTER-OAGH | (16h 49m 01.73s , -21d 42m 06.9s) | C | 60 | 18.6 | 33482 | 2026-04-17 09:27:37 | MASTER-OAGH | (16h 50m 21.20s , -22d 15m 23.1s) | C | 60 | 18.5 | 33623 | 2026-04-17 09:29:57 | MASTER-OAGH | (16h 57m 31.70s , -21d 41m 24.1s) | C | 60 | 18.4 | 33623 | 2026-04-17 09:29:57 | MASTER-OAGH | (16h 58m 51.05s , -22d 14m 41.2s) | C | 60 | 18.4 | 33707 | 2026-04-17 09:31:22 | MASTER-OAGH | (16h 52m 40.16s , -19d 48m 15.7s) | C | 60 | 18.3 | 33707 | 2026-04-17 09:31:22 | MASTER-OAGH | (16h 53m 58.91s , -20d 21m 31.2s) | C | 60 | 18.2 | 33829 | 2026-04-17 09:33:24 | MASTER-OAGH | (17h 01m 02.95s , -19d 47m 31.7s) | C | 60 | 18.3 | 33829 | 2026-04-17 09:33:24 | MASTER-OAGH | (17h 02m 21.63s , -20d 20m 48.3s) | C | 60 | 18.2 | 33903 | 2026-04-17 09:34:38 | MASTER-OAGH | (16h 32m 37.41s , -21d 41m 32.3s) | C | 60 | 18.8 | 33903 | 2026-04-17 09:34:38 | MASTER-OAGH | (16h 33m 57.28s , -22d 14m 46.5s) | C | 60 | 18.4 | 34040 | 2026-04-17 09:36:54 | MASTER-OAGH | (16h 41m 08.87s , -21d 40m 50.5s) | C | 60 | 18.8 | 34040 | 2026-04-17 09:36:54 | MASTER-OAGH | (16h 42m 28.69s , -22d 14m 05.1s) | C | 60 | 18.5 | 34111 | 2026-04-17 09:38:06 | MASTER-OAGH | (16h 41m 19.27s , -17d 53m 52.1s) | C | 60 | 19.0 | 34111 | 2026-04-17 09:38:06 | MASTER-OAGH | (16h 42m 37.77s , -18d 27m 05.1s) | C | 60 | 18.8 | 34250 | 2026-04-17 09:40:25 | MASTER-OAGH | (16h 49m 38.03s , -17d 53m 08.4s) | C | 60 | 19.0 | 34250 | 2026-04-17 09:40:25 | MASTER-OAGH | (16h 50m 56.55s , -18d 26m 22.3s) | C | 60 | 18.7 | 34323 | 2026-04-17 09:41:37 | MASTER-OAGH | (16h 48m 59.07s , -21d 42m 07.0s) | C | 60 | 18.8 | 34323 | 2026-04-17 09:41:37 | MASTER-OAGH | (16h 50m 18.95s , -22d 15m 22.2s) | C | 60 | 18.5 | 34452 | 2026-04-17 09:43:47 | MASTER-OAGH | (16h 57m 30.68s , -21d 41m 25.0s) | C | 60 | 18.4 | 34452 | 2026-04-17 09:43:47 | MASTER-OAGH | (16h 58m 50.48s , -22d 14m 40.9s) | C | 60 | 18.3 | 34525 | 2026-04-17 09:45:00 | MASTER-OAGH | (16h 32m 37.27s , -21d 41m 30.9s) | C | 60 | 18.5 | 34525 | 2026-04-17 09:45:00 | MASTER-OAGH | (16h 33m 57.36s , -22d 14m 44.6s) | C | 60 | 18.4 | 34669 | 2026-04-17 09:47:23 | MASTER-OAGH | (16h 41m 07.06s , -21d 40m 49.7s) | C | 60 | 18.9 | 34669 | 2026-04-17 09:47:23 | MASTER-OAGH | (16h 42m 27.11s , -22d 14m 03.8s) | C | 60 | 18.3 | 34743 | 2026-04-17 09:48:38 | MASTER-OAGH | (16h 57m 12.13s , -17d 55m 25.8s) | C | 60 | 18.5 | 34743 | 2026-04-17 09:48:38 | MASTER-OAGH | (16h 58m 30.72s , -18d 28m 39.2s) | C | 60 | 18.4 | 34814 | 2026-04-17 09:49:49 | MASTER-OAGH | (17h 05m 40.56s , -17d 55m 27.6s) | C | 60 | 18.4 | 34814 | 2026-04-17 09:49:49 | MASTER-OAGH | (17h 06m 59.07s , -18d 28m 41.9s) | C | 60 | 18.2 | 34890 | 2026-04-17 09:51:05 | MASTER-OAGH | (16h 47m 08.33s , -16d 00m 04.5s) | C | 60 | 18.8 | 34890 | 2026-04-17 09:51:05 | MASTER-OAGH | (16h 48m 26.55s , -16d 33m 16.5s) | C | 60 | 18.4 | 34962 | 2026-04-17 09:52:16 | MASTER-OAGH | (16h 55m 21.65s , -16d 01m 22.1s) | C | 60 | 18.8 | 34962 | 2026-04-17 09:52:16 | MASTER-OAGH | (16h 56m 39.82s , -16d 34m 34.4s) | C | 60 | 18.4 | 35100 | 2026-04-17 09:54:35 | MASTER-OAGH | (16h 48m 51.47s , -21d 41m 06.9s) | C | 60 | 18.7 | 35100 | 2026-04-17 09:54:35 | MASTER-OAGH | (16h 50m 11.53s , -22d 14m 21.4s) | C | 60 | 18.2 | 35172 | 2026-04-17 09:55:47 | MASTER-OAGH | (16h 57m 36.62s , -21d 42m 25.9s) | C | 60 | 18.3 | 35172 | 2026-04-17 09:55:47 | MASTER-OAGH | (16h 58m 56.66s , -22d 15m 40.8s) | C | 60 | 18.1 | 35365 | 2026-04-17 09:59:00 | MASTER-OAGH | (16h 32m 28.88s , -21d 40m 27.7s) | C | 60 | 18.6 | 35365 | 2026-04-17 09:59:00 | MASTER-OAGH | (16h 33m 49.14s , -22d 13m 40.8s) | C | 60 | 18.5 | 35437 | 2026-04-17 10:00:12 | MASTER-OAGH | (16h 41m 11.93s , -21d 41m 48.2s) | C | 60 | 18.8 | 35437 | 2026-04-17 10:00:12 | MASTER-OAGH | (16h 42m 32.17s , -22d 15m 01.2s) | C | 60 | 18.5 | 35572 | 2026-04-17 10:02:26 | MASTER-OAGH | (16h 57m 09.74s , -17d 53m 25.2s) | C | 60 | 18.3 | 35572 | 2026-04-17 10:02:26 | MASTER-OAGH | (16h 58m 28.54s , -18d 26m 37.5s) | C | 60 | 18.2 | 35645 | 2026-04-17 10:03:39 | MASTER-OAGH | (17h 05m 40.51s , -17d 54m 44.2s) | C | 60 | 18.5 | 35645 | 2026-04-17 10:03:39 | MASTER-OAGH | (17h 06m 59.29s , -18d 27m 57.1s) | C | 60 | 18.3 | 35783 | 2026-04-17 10:05:58 | MASTER-OAGH | (16h 47m 01.28s , -15d 59m 01.9s) | C | 60 | 18.6 | 35783 | 2026-04-17 10:05:58 | MASTER-OAGH | (16h 48m 19.78s , -16d 32m 13.0s) | C | 60 | 18.5 | 35855 | 2026-04-17 10:07:09 | MASTER-OAGH | (16h 55m 27.36s , -16d 00m 20.8s) | C | 60 | 18.7 | 35855 | 2026-04-17 10:07:10 | MASTER-OAGH | (16h 56m 45.83s , -16d 33m 32.1s) | C | 60 | 18.3 | 35994 | 2026-04-17 10:09:29 | MASTER-OAGH | (16h 48m 51.27s , -21d 41m 03.9s) | C | 60 | 18.2 | 35994 | 2026-04-17 10:09:29 | MASTER-OAGH | (16h 50m 11.66s , -22d 14m 17.1s) | C | 60 | 18.0 | 36066 | 2026-04-17 10:10:40 | MASTER-OAGH | (16h 57m 33.67s , -21d 42m 23.9s) | C | 60 | 18.3 | 36066 | 2026-04-17 10:10:40 | MASTER-OAGH | (16h 58m 54.02s , -22d 15m 37.6s) | C | 60 | 18.2 | 36205 | 2026-04-17 10:13:00 | MASTER-OAGH | (16h 32m 27.34s , -21d 40m 22.7s) | C | 60 | 18.7 | 36205 | 2026-04-17 10:13:00 | MASTER-OAGH | (16h 33m 47.73s , -22d 13m 35.0s) | C | 60 | 18.5 | 36277 | 2026-04-17 10:14:12 | MASTER-OAGH | (16h 41m 10.39s , -21d 41m 43.7s) | C | 60 | 18.6 | 36277 | 2026-04-17 10:14:12 | MASTER-OAGH | (16h 42m 30.81s , -22d 14m 56.0s) | C | 60 | 18.3 | 36415 | 2026-04-17 10:16:30 | MASTER-OAGH | (16h 57m 09.16s , -17d 53m 23.0s) | C | 60 | 18.4 | 36415 | 2026-04-17 10:16:30 | MASTER-OAGH | (16h 58m 28.16s , -18d 26m 34.5s) | C | 60 | 18.3 | 36487 | 2026-04-17 10:17:42 | MASTER-OAGH | (17h 05m 39.73s , -17d 54m 43.0s) | C | 60 | 18.4 | 36487 | 2026-04-17 10:17:42 | MASTER-OAGH | (17h 06m 58.72s , -18d 27m 55.2s) | C | 60 | 18.3 | 36629 | 2026-04-17 10:20:03 | MASTER-OAGH | (16h 46m 59.46s , -15d 58m 58.3s) | C | 60 | 18.8 | 36629 | 2026-04-17 10:20:03 | MASTER-OAGH | (16h 48m 18.03s , -16d 32m 09.1s) | C | 60 | 18.5 | 36703 | 2026-04-17 10:21:18 | MASTER-OAGH | (16h 55m 25.86s , -16d 00m 18.3s) | C | 60 | 18.7 | 36703 | 2026-04-17 10:21:18 | MASTER-OAGH | (16h 56m 44.47s , -16d 33m 29.4s) | C | 60 | 18.4 | 36837 | 2026-04-17 10:23:31 | MASTER-OAGH | (16h 48m 49.03s , -21d 41m 00.1s) | C | 60 | 18.6 | 36837 | 2026-04-17 10:23:31 | MASTER-OAGH | (16h 50m 09.50s , -22d 14m 13.3s) | C | 60 | 18.3 | 36908 | 2026-04-17 10:24:43 | MASTER-OAGH | (16h 57m 32.40s , -21d 42m 21.3s) | C | 60 | 18.5 | 36908 | 2026-04-17 10:24:43 | MASTER-OAGH | (16h 58m 52.86s , -22d 15m 34.6s) | C | 60 | 18.4 | 37066 | 2026-04-17 10:27:21 | MASTER-OAGH | (16h 32m 33.54s , -21d 38m 42.0s) | C | 60 | 18.5 | 37066 | 2026-04-17 10:27:21 | MASTER-OAGH | (16h 31m 24.17s , -21d 05m 13.0s) | C | 60 | 18.2 | 37142 | 2026-04-17 10:28:37 | MASTER-OAGH | (16h 41m 16.30s , -21d 40m 15.8s) | C | 60 | 18.6 | 37142 | 2026-04-17 10:28:37 | MASTER-OAGH | (16h 40m 07.03s , -21d 06m 46.5s) | C | 60 | 18.3 | 39314 | 2026-04-17 11:04:49 | MASTER-OAGH | (16h 57m 11.67s , -17d 51m 44.4s) | C | 60 | 18.1 | 39314 | 2026-04-17 11:04:49 | MASTER-OAGH | (16h 56m 03.06s , -17d 18m 22.3s) | C | 60 | 18.0 | 39387 | 2026-04-17 11:06:01 | MASTER-OAGH | (17h 05m 42.07s , -17d 53m 17.1s) | C | 60 | 18.4 | 39387 | 2026-04-17 11:06:01 | MASTER-OAGH | (17h 04m 33.48s , -17d 19m 55.0s) | C | 60 | 18.1 | 39525 | 2026-04-17 11:08:20 | MASTER-OAGH | (16h 47m 04.61s , -15d 57m 26.8s) | C | 60 | 18.8 | 39525 | 2026-04-17 11:08:20 | MASTER-OAGH | (16h 45m 56.53s , -15d 24m 06.0s) | C | 60 | 18.5 | 39607 | 2026-04-17 11:09:42 | MASTER-OAGH | (16h 55m 29.68s , -15d 58m 54.6s) | C | 60 | 18.8 | 39607 | 2026-04-17 11:09:42 | MASTER-OAGH | (16h 54m 21.53s , -15d 25m 33.9s) | C | 60 | 18.6 | 39730 | 2026-04-17 11:11:44 | MASTER-OAGH | (16h 46m 23.07s , -23d 33m 54.5s) | C | 60 | 19.1 | 39730 | 2026-04-17 11:11:44 | MASTER-OAGH | (16h 45m 14.38s , -23d 00m 36.8s) | C | 60 | 18.6 | 39806 | 2026-04-17 11:13:01 | MASTER-OAGH | (16h 54m 59.24s , -23d 35m 22.5s) | C | 60 | 18.7 | 39806 | 2026-04-17 11:13:01 | MASTER-OAGH | (16h 53m 50.49s , -23d 02m 04.7s) | C | 60 | 18.3 | 39939 | 2026-04-17 11:15:14 | MASTER-OAGH | (16h 57m 12.00s , -17d 51m 51.3s) | C | 60 | 18.4 | 39939 | 2026-04-17 11:15:14 | MASTER-OAGH | (16h 56m 04.23s , -17d 18m 33.2s) | C | 60 | 18.1 | 40010 | 2026-04-17 11:16:25 | MASTER-OAGH | (17h 05m 41.32s , -17d 53m 18.8s) | C | 60 | 18.5 | 40010 | 2026-04-17 11:16:25 | MASTER-OAGH | (17h 04m 33.46s , -17d 20m 00.4s) | C | 60 | 18.3 | 40764 | 2026-04-17 11:28:58 | MASTER-OAGH | (16h 47m 07.63s , -15d 58m 21.3s) | C | 60 | 19.0 | 40764 | 2026-04-17 11:28:59 | MASTER-OAGH | (16h 46m 00.12s , -15d 24m 52.6s) | C | 60 | 18.6 | 40836 | 2026-04-17 11:30:11 | MASTER-OAGH | (16h 55m 24.77s , -15d 57m 26.6s) | C | 60 | 19.0 | 40836 | 2026-04-17 11:30:11 | MASTER-OAGH | (16h 54m 17.25s , -15d 23m 58.6s) | C | 60 | 18.8 | 40975 | 2026-04-17 11:32:30 | MASTER-OAGH | (16h 46m 14.22s , -23d 32m 25.7s) | C | 60 | 19.2 | 40975 | 2026-04-17 11:32:30 | MASTER-OAGH | (16h 45m 06.50s , -22d 58m 59.6s) | C | 60 | 18.6 | 41047 | 2026-04-17 11:33:42 | MASTER-OAGH | (16h 55m 05.07s , -23d 33m 56.5s) | C | 60 | 18.8 | 41047 | 2026-04-17 11:33:42 | MASTER-OAGH | (16h 53m 57.29s , -23d 00m 30.7s) | C | 60 | 18.4 | 41777 | 2026-04-17 11:45:52 | MASTER-OAGH | (17h 05m 34.84s , -17d 51m 28.6s) | C | 60 | 18.4 | 41777 | 2026-04-17 11:45:52 | MASTER-OAGH | (17h 04m 27.36s , -17d 18m 01.6s) | C | 60 | 18.0 | 41849 | 2026-04-17 11:47:03 | MASTER-OAGH | (16h 47m 07.80s , -15d 57m 31.8s) | C | 60 | 18.5 | 41849 | 2026-04-17 11:47:03 | MASTER-OAGH | (16h 46m 00.89s , -15d 24m 06.5s) | C | 60 | 18.1 | 41978 | 2026-04-17 11:49:13 | MASTER-OAGH | (16h 55m 21.03s , -15d 57m 01.0s) | C | 60 | 18.0 | 41978 | 2026-04-17 11:49:13 | MASTER-OAGH | (16h 54m 13.96s , -15d 23m 37.2s) | C | 60 | 17.9 | 42051 | 2026-04-17 11:50:26 | MASTER-OAGH | (16h 46m 19.67s , -23d 33m 05.3s) | C | 60 | 18.7 | 42051 | 2026-04-17 11:50:26 | MASTER-OAGH | (16h 45m 12.17s , -22d 59m 44.3s) | C | 60 | 18.1 | 42239 | 2026-04-17 11:53:34 | MASTER-OAGH | (16h 54m 57.43s , -23d 32m 33.4s) | C | 60 | 18.3 | 42239 | 2026-04-17 11:53:34 | MASTER-OAGH | (16h 53m 49.94s , -22d 59m 13.4s) | C | 60 | 17.9 | 42464 | 2026-04-17 11:57:19 | MASTER-OAGH | (17h 05m 18.40s , -21d 40m 12.2s) | C | 60 | 17.9 | 42464 | 2026-04-17 11:57:19 | MASTER-OAGH | (17h 04m 11.01s , -21d 06m 52.2s) | C | 60 | 17.5 | 42673 | 2026-04-17 12:00:48 | MASTER-OAGH | (16h 46m 14.08s , -23d 31m 54.8s) | C | 60 | 17.4 | 42673 | 2026-04-17 12:00:48 | MASTER-OAGH | (16h 45m 06.83s , -22d 58m 35.4s) | C | 60 | 16.9 | 42747 | 2026-04-17 12:02:02 | MASTER-OAGH | (17h 08m 38.03s , -19d 47m 26.3s) | C | 60 | 17.6 | 42747 | 2026-04-17 12:02:02 | MASTER-OAGH | (17h 07m 31.18s , -19d 14m 06.8s) | C | 60 | 17.3 | 42892 | 2026-04-17 12:04:27 | MASTER-OAGH | (16h 54m 57.84s , -23d 32m 21.8s) | C | 60 | 17.3 | 42892 | 2026-04-17 12:04:27 | MASTER-OAGH | (16h 53m 50.53s , -22d 59m 02.3s) | C | 60 | 16.8 | 43102 | 2026-04-17 12:07:57 | MASTER-OAGH | (16h 39m 31.20s , -15d 55m 41.1s) | C | 60 | 16.8 | 43102 | 2026-04-17 12:07:57 | MASTER-OAGH | (16h 38m 25.45s , -15d 22m 21.9s) | C | 60 | 16.5 | 43180 | 2026-04-17 12:09:14 | MASTER-OAGH | (17h 05m 18.13s , -21d 39m 56.8s) | C | 60 | 17.0 | 43180 | 2026-04-17 12:09:14 | MASTER-OAGH | (17h 04m 11.09s , -21d 06m 38.0s) | C | 60 | 16.5 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. [1] - V.M. Lipunov, V.G. Kornilov, E.S. Gorbovskoy, N.A. Tiurina & A.S.Kuznetsov, 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591pp. http : // www.pereplet.ru/lipunov/625.html View this GCN Circular online at https://gcn.nasa.gov/circulars/44333. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42454] Konus-Wind detection of GRB 260411B
by GCN Circulars 17 Apr '26

17 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44332 SUBJECT: Konus-Wind detection of GRB 260411B DATE: 26/04/17 17:11:27 GMT FROM: Anna Ridnaia at Ioffe Institute <ridnaia(a)mail.ioffe.ru> A. Ridnaia, D. Frederiks, A. Lysenko, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The long-duration GRB 260411B (Fermi-GBM detection: The Fermi GBM team, GCN 44262, Pathak & Sonawane, GCN 44266; BALROG localization: Preis & Greiner, GCN 44263; SVOM-GRM detection: Wang et al., GCN 44268; Fermi-LAT detection: Longo et al., GCN 44277; GECAM-B detection: Zao et al., GCN 44285; Glowbug detection: Woolf et al., GCN 44312; IPN triangulation: Kozyrev et al., GCN 44329) triggered Konus-Wind at T0=29079.388 s UT (08:04:39.388). The burst light curve shows a multipeaked structure which starts at ~T0-8.7 s and has a total duration of ~55.6 s. The emission is seen up to ~10 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB260411_T29079/ As observed by Konus-Wind, the burst had a fluence of 4.50(-0.50,+0.50)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0+1.440 s, of 1.15(-0.14,+0.14)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum of the burst (measured from T0 to T0+49.408 s) is best fit in the 20 keV - 10 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.62(-0.18,+0.19), the high energy photon index beta = -2.12(-0.19,+0.12), the peak energy Ep = 290(-38,+52) keV (chi2 = 82/98 dof). The spectrum near the maximum count rate (measured from T0+0.256 to T0+8.448 s) is best fit in the 20 keV - 10 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.16(-0.15,+0.16), the high energy photon index beta = -2.19(-0.10,+0.08), the peak energy Ep = 248(-19,+23) keV (chi2 = 87/82 dof). All the quoted errors are at the 68% confidence level. All the quoted values are preliminary. View this GCN Circular online at https://gcn.nasa.gov/circulars/44332. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42453] GRB 260417B: Fermi GBM Final Real-time Localization
by GCN Circulars 17 Apr '26

17 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44331 SUBJECT: GRB 260417B: Fermi GBM Final Real-time Localization DATE: 26/04/17 15:54:29 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply(a)GIOC.nsstc.nasa.gov> The Fermi GBM team reports the detection of a likely LONG GRB At 15:43:55 UT on 17 Apr 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260417B (trigger 798133440.23068 / 260417655). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 264.8, Dec = -27.4 (J2000 degrees, equivalent to J2000 17h 39m, -27d 23'), with a statistical uncertainty of 8.4 degrees. The angle from the Fermi LAT boresight is 29.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260417655/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260417655/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260417655/… View this GCN Circular online at https://gcn.nasa.gov/circulars/44331. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42452] GRB 260417A: AstroSat CZTI detection
by GCN Circulars 17 Apr '26

17 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44330 SUBJECT: GRB 260417A: AstroSat CZTI detection DATE: 26/04/17 15:23:26 GMT FROM: Anuraag Arya at IIT Bombay <aryaanuraag910(a)gmail.com> S. Salunke (IUCAA), M. Tembhurnikar (IUCAA), Harsha K. H. (IUCAA), A. Goyal (IITB), A. Arya (IITB), G. Waratkar (Caltech/IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration: Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long GRB 260417A which was also detected by Fermi GBM (Fermi GBM Team, GCN Circ. 44317). The source was clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2026-04-17 00:10:09.33 UTC. The measured peak count rate associated with the burst is 117 (+25, -18) counts/s above the background in the combined data of all quadrants, with a total of 1532 (+379, -412) counts. The local mean background count rate was 744 (+3, -3) counts/s. We measure a T90 of 29 (+3, -15) s from the cumulative Veto light curve. The source was also faintly detected in the 20-200 keV energy range. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project. CZTI GRB detections are reported regularly on the payload site at: http://astrosat.iucaa.in/czti/?q=grb View this GCN Circular online at https://gcn.nasa.gov/circulars/44330. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42451] IPN triangulation of GRB 260411B
by GCN Circulars 17 Apr '26

17 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44329 SUBJECT: IPN triangulation of GRB 260411B DATE: 26/04/17 15:16:20 GMT FROM: Anna Ridnaia at Ioffe Institute <ridnaia(a)mail.ioffe.ru> A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin on behalf of the HEND/Mars Odyssey team, A. Ridnaia, D. Frederiks, A. Lysenko, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, A. Goldstein, M. S. Briggs, C. Wilson-Hodge, and E. Burns on behalf of the Fermi-GBM team, and W. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr, and A.S. Gardner on on behalf of the GRS-Odyssey GRB team, report: The long-duration GRB 260411B (Fermi-GBM detection: The Fermi GBM team, GCN 44262, Pathak & Sonawane, GCN 44266; BALROG localization: Preis & Greiner, GCN 44263; SVOM-GRM detection: Wang et al., GCN 44268; Fermi-LAT detection: Longo et al., GCN 44277; GECAM-B detection: Zao et al., GCN 44285; Glowbug detection: Woolf et al., GCN 44312) was detected by Fermi (GBM, LAT), Konus-Wind, SVOM (GRM), GECAM-B, Glowbug, and Mars-Odyssey (HEND) at about 29075 s UT (08:04:35). We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 85.558 (05h 42m 14s) +2.297 ( +2d 17' 50") Corners: 85.572 (05h 42m 17s) -0.527 ( +0d 31' 39") 85.610 (05h 42m 26s) -0.425 ( +0d 25' 29") 85.523 (05h 42m 05s) +5.509 ( +5d 30' 32") 85.486 (05h 41m 57s) +5.372 ( +5d 22' 20") --------------------------------------------- The error box area is 844 sq. arcmin, and its maximum dimension is 6.0 deg (the minimum one is 2.4 arcmin). The Sun distance was 65 deg. This localization may be improved. The OT reported by GOTO (GOTO26dam, GCN 44265) is inside the IPN box, strengthening the association of the OT and GRB 260411B. A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB260411_T29079/IPN/ The HEALPix triangulation map is the multi-order HEALPix in units of probability density. The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular. View this GCN Circular online at https://gcn.nasa.gov/circulars/44329. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42450] EP260416a: LCO observations confirm end of flaring phase
by GCN Circulars 17 Apr '26

17 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44328 SUBJECT: EP260416a: LCO observations confirm end of flaring phase DATE: 26/04/17 13:52:03 GMT FROM: Antonio Martin-Carrillo at UCD,Space Science Group <antonio.martin-carrillo(a)ucd.ie> A. Martin-Carrillo (UCD), L. Cotter (UCD), A. J. Levan (Radboud & Warwick), J. A. Chácon (PUC), D. B. Malesani (DAWN/NBI and Radboud), P. G. Jonker (Radboud) report on behalf of a larger collaboration: We observed the field of EP260416a (Hu et al., GCN Circ. 44307) with the LCO 1m telescope located at the McDonald Observatory (Texas, USA) equipped with the SINISTRO instrument. We obtained 6x300s exposures in the r band starting at 09:58:28.32 UT on the 17th of April 2026, approximately 28.48 hr after the initial trigger. In the stacked images the optical counterpart (Ducoin et al., GCN 44310, Li et al., GCN 44315, Hua et al., GCN 44318, Lee et al., GCN 44319, Zheng et al., GCN 44321) is well detected, and we measure an AB magnitude of r = 20.78 +/- 0.06, calibrated using nearby stars from the Pan-STARRS catalogue and not corrected for Galactic extinction. Compared to the previous observations made by Lee et al. (GCN Circ. 44319) the counterpart seems to have faded by approximately 0.18 AB mag in 5.6 hr. View this GCN Circular online at https://gcn.nasa.gov/circulars/44328. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42449] EP260324a / AT2026hir: Further multiband optical follow-up with the PKU 60cm Telescope
by GCN Circulars 17 Apr '26

17 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44327 SUBJECT: EP260324a / AT2026hir: Further multiband optical follow-up with the PKU 60cm Telescope DATE: 26/04/17 13:01:53 GMT FROM: Qiang Wang at Peking University <2501110280(a)stu.pku.edu.cn> Qiang Wang, Yacheng Kang, Ruize Shi, Xinmiao Zhao, and Fangzhou Ren (PKU) report on behalf of the PKU HiTF (High-energy Transients Follow-up) group: We observed the field of EP260324a (Wu et al., ATel 17728; T0 = 2026-03-24T07:04:20) using the PKU 60cm telescope at Xinglong Observatory, NAOC. Observations were conducted over multiple epochs between 2026 Mar 30 and Apr 11, corresponding to ~ 6.3–18.3 days after the EP-WXT detection, in the g, r, and i bands. In the stacked images, we clearly detect the optical counterpart in the difference images at a position consistent with that of ZTF26aapviim / AT2026hir (Anumarlapudi et al., GCN 44120; Mohan et al., GCN 44128; Kang et al., GCN 44156; Stein et al., GCN 44194; Globus et al., GCN 44196; Watson et al., GCN 44216). Preliminary photometry is calibrated against nearby Pan-STARRS field stars and reported in the AB magnitude system, without correction for Galactic extinction. Combining these data with our earlier observations on 2026 March 27 (Kang et al., GCN 44156), we find that the optical emission likely peaked at ~ 1 week after the EP trigger. Following the peak, we estimate the temporal decay using a simple power-law model, yielding indices of alpha_g ~ 1.13 and alpha_r ~ 0.93. The observation log is summarized below following the time sequence: | Date | Start_UT | T_mid − T0 (days) | Filter | Exposure (s) | Magnitude (AB) | | :--------: | :---------: | :---------------: | :----: | :----------: | :------------: | | 2026-03-30 | 14:03:01.11 | 6.30 | g | 2 * 600 | 17.40 +/- 0.03 | | 2026-03-30 | 14:25:47.00 | 6.31 | r | 2 * 600 | 17.62 +/- 0.04 | | 2026-03-31 | 13:25:47.93 | 7.27 | g | 2 * 600 | 17.31 +/- 0.03 | | 2026-03-31 | 13:48:41.86 | 7.29 | r | 2 * 600 | 17.64 +/- 0.04 | | 2026-03-31 | 14:11:31.90 | 7.34 | i | 12 * 600 | 17.87 +/- 0.03 | | 2026-04-06 | 14:02:29.94 | 13.30 | i | 4 * 600 | 18.11 +/- 0.03 | | 2026-04-06 | 14:45:34.47 | 13.34 | g | 4 * 600 | 17.97 +/- 0.03 | | 2026-04-07 | 13:49:09.03 | 14.30 | g | 4 * 600 | 18.06 +/- 0.03 | | 2026-04-07 | 14:34:49.59 | 14.33 | r | 4 * 600 | 18.27 +/- 0.04 | | 2026-04-10 | 14:10:56.15 | 17.31 | g | 5 * 600 | 18.42 +/- 0.03 | | 2026-04-10 | 15:04:02.07 | 17.35 | r | 5 * 600 | 18.54 +/- 0.04 | | 2026-04-11 | 13:05:42.64 | 18.28 | r | 6 * 600 | 18.57 +/- 0.05 | Further analysis and follow-up observations are ongoing. The PKU 60cm Telescope is operated by the Department of Astronomy, Peking University. The PKU HiTF group is dedicated to rapid follow-up observations of high-energy transients. View this GCN Circular online at https://gcn.nasa.gov/circulars/44327. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42448] EP260417a: TRT optical counterpart detection
by GCN Circulars 17 Apr '26

17 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44326 SUBJECT: EP260417a: TRT optical counterpart detection DATE: 26/04/17 11:48:23 GMT FROM: L. B. He at NAOC <helb(a)bao.ac.cn> L.B. He (NAOC), K. Noysena, K. Chanchaiworawit, S. Tinyanont (NARIT), S.Q. Jiang, X. Liu, Z.P. Zhu, J. An, D. Xu (NAOC), S.Y. Fu (HUST) report: We observed the field of EP260417a detected by EP (Wang et. al, GCN 44325), using the 0.7-m telescope of the Thai Robotic Telescope network, located at Cerro Tololo Inter-American Observatory, Chile (TRT-CTO). We obtained a series of frames in the Sloan-r band. An uncatalogued source is detected within the EP/WXT error circle at coordinates R.A. (J2000) = 16:21:17.47 (245.3228), Dec. (J2000) = -22:01:26.31 (-22.0240) with an uncertainty of ~ 1.0 arcsec. The source had r = 20.30 +/- 0.03 mag at a median time of ~ 7.92 hr post-trigger, calibrated with Pan-STARRS1 DR2 and not corrected for Galactic extinction. No NEO would be at the above position at the observational time by checking MPC. We thus think the source could be the optical counterpart of EP260417a. View this GCN Circular online at https://gcn.nasa.gov/circulars/44326. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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