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[vsnet-grb-info 42135] EP260314a: Global MASTER-Net observations report
by GCN Circulars 15 Mar '26

15 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44014 SUBJECT: EP260314a: Global MASTER-Net observations report DATE: 26/03/15 09:18:43 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) was pointed to the EP260314a ( EP Team et al., GCN 44010) errorbox 18771 sec after notice time and 31448 sec after trigger time at 2026-03-15 07:35:44 UT, with upper limit up to 20.4 mag. The observations began at zenith distance = 10 deg. The sun altitude is -37.3 deg. The galactic latitude b = 36 deg., longitude l = 325 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3187114 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 31478 | 2026-03-15 07:35:44 | MASTER-OAFA | (14h 03m 09.70s , -23d 05m 06.7s) | C | 60 | 20.1 | 31538 | 2026-03-15 07:35:44 | MASTER-OAFA | (14h 03m 09.70s , -23d 05m 06.8s) | C | 180 | 20.4 | Coadd 31555 | 2026-03-15 07:37:01 | MASTER-OAFA | (14h 11m 52.28s , -23d 06m 44.8s) | C | 60 | 20.0 | 31615 | 2026-03-15 07:37:01 | MASTER-OAFA | (14h 11m 52.28s , -23d 06m 44.8s) | C | 180 | 20.4 | Coadd 31632 | 2026-03-15 07:38:17 | MASTER-OAFA | (14h 03m 12.03s , -23d 05m 00.4s) | C | 60 | 20.0 | 31707 | 2026-03-15 07:39:33 | MASTER-OAFA | (14h 11m 49.57s , -23d 06m 01.9s) | C | 60 | 20.0 | 31784 | 2026-03-15 07:40:49 | MASTER-OAFA | (14h 03m 07.51s , -23d 04m 36.7s) | C | 60 | 20.0 | 33575 | 2026-03-15 08:10:40 | MASTER-OAFA | (14h 11m 51.09s , -23d 04m 19.3s) | C | 60 | 20.0 | 33650 | 2026-03-15 08:11:56 | MASTER-OAFA | (14h 11m 57.93s , -23d 05m 18.8s) | C | 60 | 19.9 | 33710 | 2026-03-15 08:11:56 | MASTER-OAFA | (14h 11m 57.94s , -23d 05m 18.8s) | C | 180 | 20.4 | Coadd 33726 | 2026-03-15 08:13:11 | MASTER-OAFA | (14h 11m 51.16s , -23d 06m 17.7s) | C | 60 | 19.8 | 33806 | 2026-03-15 08:14:32 | MASTER-OAFA | (14h 03m 15.81s , -23d 05m 54.0s) | C | 60 | 20.0 | 33866 | 2026-03-15 08:14:32 | MASTER-OAFA | (14h 03m 15.81s , -23d 05m 54.1s) | C | 180 | 20.4 | Coadd 33886 | 2026-03-15 08:15:52 | MASTER-OAFA | (14h 03m 12.24s , -23d 04m 20.5s) | C | 60 | 20.1 | 33966 | 2026-03-15 08:17:12 | MASTER-OAFA | (14h 03m 12.30s , -23d 05m 42.2s) | C | 60 | 20.1 | 35185 | 2026-03-15 08:36:30 | MASTER- | (14h 07m 08.18s , -23d 27m 00.1s) | C | 180 | 19.3 | 35185 | 2026-03-15 08:36:30 | MASTER- | (14h 08m 27.19s , -24d 01m 06.3s) | C | 180 | 19.5 | 35377 | 2026-03-15 08:39:42 | MASTER- | (14h 07m 13.49s , -23d 28m 05.1s) | C | 180 | 19.6 | 35377 | 2026-03-15 08:39:42 | MASTER- | (14h 08m 32.57s , -24d 02m 10.3s) | C | 180 | 19.6 | 35568 | 2026-03-15 08:42:54 | MASTER- | (14h 07m 08.52s , -23d 29m 07.4s) | C | 180 | 19.5 | 35568 | 2026-03-15 08:42:54 | MASTER- | (14h 08m 27.64s , -24d 03m 12.2s) | C | 180 | 19.8 | 35534 | 2026-03-15 08:43:20 | MASTER-OAFA | (14h 11m 56.24s , -23d 04m 00.8s) | C | 60 | 19.9 | 35610 | 2026-03-15 08:44:36 | MASTER-OAFA | (14h 11m 56.27s , -23d 05m 30.6s) | C | 60 | 19.9 | 35760 | 2026-03-15 08:46:05 | MASTER- | (14h 07m 13.91s , -23d 28m 54.9s) | C | 180 | 19.3 | 35760 | 2026-03-15 08:46:05 | MASTER- | (14h 08m 33.15s , -24d 02m 59.4s) | C | 180 | 19.8 | 35891 | 2026-03-15 08:49:17 | MASTER-OAFA | (14h 03m 17.80s , -23d 04m 26.7s) | C | 60 | 20.0 | 35951 | 2026-03-15 08:49:17 | MASTER- | (14h 07m 10.42s , -23d 27m 22.5s) | C | 180 | 19.4 | 35951 | 2026-03-15 08:49:17 | MASTER- | (14h 08m 29.74s , -24d 01m 26.6s) | C | 180 | 19.9 | 36142 | 2026-03-15 08:52:28 | MASTER- | (14h 07m 10.07s , -23d 29m 05.4s) | C | 180 | 19.6 | 36142 | 2026-03-15 08:52:28 | MASTER- | (14h 08m 29.52s , -24d 03m 08.8s) | C | 180 | 19.8 | 36335 | 2026-03-15 08:55:40 | MASTER- | (14h 07m 12.33s , -23d 27m 15.8s) | C | 180 | 19.7 | 36335 | 2026-03-15 08:55:40 | MASTER- | (14h 08m 31.87s , -24d 01m 18.8s) | C | 180 | 19.9 | 36526 | 2026-03-15 08:58:52 | MASTER- | (14h 07m 05.49s , -23d 28m 09.4s) | C | 180 | 19.8 | 36526 | 2026-03-15 08:58:52 | MASTER- | (14h 08m 25.17s , -24d 02m 11.9s) | C | 180 | 19.8 | 36723 | 2026-03-15 09:02:09 | MASTER- | (14h 07m 05.49s , -23d 27m 09.1s) | C | 180 | 19.8 | 36723 | 2026-03-15 09:02:09 | MASTER- | (14h 08m 25.25s , -24d 01m 11.3s) | C | 180 | 19.8 | 36914 | 2026-03-15 09:05:20 | MASTER- | (14h 07m 12.73s , -23d 28m 09.7s) | C | 180 | 19.7 | 36914 | 2026-03-15 09:05:20 | MASTER- | (14h 08m 32.56s , -24d 02m 11.3s) | C | 180 | 19.8 | 37105 | 2026-03-15 09:08:31 | MASTER- | (14h 07m 05.16s , -23d 29m 09.4s) | C | 180 | 19.7 | 37105 | 2026-03-15 09:08:31 | MASTER- | (14h 08m 25.09s , -24d 03m 10.6s) | C | 180 | 19.6 | 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/44014. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42134] EP260314a: SVOM/VT optical candidate
by GCN Circulars 15 Mar '26

15 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44013 SUBJECT: EP260314a: SVOM/VT optical candidate DATE: 26/03/15 03:58:26 GMT FROM: Huali Li at at NAOC, SVOM <lhl(a)nao.cas.cn> H. L. Li, L. P. Xin, Y. N. Ma, C. Wu, Z. H. Yao, Y. L. Qiu, X. H. Han, J. Wang, Y. Xu, P. P. Zhang, W. J. Xie, Y. J. Xiao, H. B. Cai, L. Lan, J. R. Xu, J. S. Deng, J. Y. Wei (NAOC), J. T. Palmerio (CEA/Irfu) report on behalf of the SVOM/VT team. SVOM/VT performed ToO observation of the field of EP260314a detected by Einstein Probe (Zhao et al., GCN 44010). The observation started at 2026-03-14T23:03:04 UTC, i.e., about 11.5 minutes post trigger in the VT_B (400-650 nm) and VT_R (650-1000 nm) channels simultaneously. An uncatalogued optical source was detected in VT_R stacked image within the error box of FXT (Zhao et al., GCN 44010). The position is at R.A., Dec. = 211.842259, -23.457728 degrees, equivalent to: R.A. (J2000) = +14:07:22.14 Dec. (J2000) = -23:27:27.82 with an uncertainty of 0.5 arcsec. The measurements in AB magnitudes are given below: Mid_time Band Exposure Time Magnitude (AB) 1.07 hour VT_R 29*50 sec 22.70+/-0.26 mag 1.07 hour VT_B 29*50 sec > 23.0 mag With the available data, we could not confirm the fading of the candidate. Our photometry was not corrected for Galactic extinction. The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. VT was jointly developed by Xi'an Institute of Optics and Precision Mechanics (XIOPM), CAS and National astronomical observatories (NAOC), CAS. View this GCN Circular online at https://gcn.nasa.gov/circulars/44013. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42133] Fermi trigger No 795185313: Global MASTER-Net observations report
by GCN Circulars 15 Mar '26

15 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44012 SUBJECT: Fermi trigger No 795185313: Global MASTER-Net observations report DATE: 26/03/15 03:30:44 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 GRB260314.53 (trigger No 795185313,14h 23m 00.00s , -11d 19m 58.8s, R=50) errorbox 48826 sec after notice time and 48862 sec after trigger time at 2026-03-15 02:22:50 UT, with upper limit up to 20.4 mag. The observations began at zenith distance = 45 deg. The sun altitude is -42.8 deg. The galactic latitude b = 45 deg., longitude l = 337 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3186061 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 48883 | 2026-03-15 02:22:50 | MASTER-OAFA | (11h 42m 55.30s , -01d 47m 48.0s) | C | 40 | 19.7 | 48943 | 2026-03-15 02:22:50 | MASTER-OAFA | (11h 42m 55.30s , -01d 47m 48.0s) | C | 160 | 20.4 | Coadd 48934 | 2026-03-15 02:23:36 | MASTER-OAFA | (11h 42m 55.23s , -01d 47m 46.9s) | C | 50 | 19.8 | 48999 | 2026-03-15 02:24:32 | MASTER-OAFA | (11h 42m 55.19s , -01d 47m 45.7s) | C | 70 | 19.9 | 49081 | 2026-03-15 02:25:48 | MASTER-OAFA | (11h 42m 55.10s , -01d 47m 45.0s) | C | 80 | 19.9 | 49191 | 2026-03-15 02:25:48 | MASTER-OAFA | (11h 42m 55.10s , -01d 47m 45.0s) | C | 300 | 20.0 | Coadd 49177 | 2026-03-15 02:27:15 | MASTER-OAFA | (11h 42m 54.96s , -01d 47m 43.8s) | C | 100 | 20.0 | 49293 | 2026-03-15 02:29:01 | MASTER-OAFA | (11h 42m 54.80s , -01d 47m 42.7s) | C | 120 | 20.1 | 49429 | 2026-03-15 02:31:07 | MASTER-OAFA | (11h 42m 54.61s , -01d 47m 41.6s) | C | 140 | 20.2 | 49544 | 2026-03-15 02:31:07 | MASTER-OAFA | (11h 42m 54.61s , -01d 47m 41.6s) | C | 370 | 20.0 | Coadd 49590 | 2026-03-15 02:33:33 | MASTER-OAFA | (11h 42m 54.38s , -01d 47m 40.7s) | C | 170 | 20.3 | 49711 | 2026-03-15 02:36:29 | MASTER-OAFA | (11h 42m 54.21s , -01d 47m 40.3s) | C | 60 | 19.8 | 49777 | 2026-03-15 02:37:35 | MASTER-OAFA | (11h 42m 54.10s , -01d 47m 40.2s) | C | 60 | 19.9 | 49837 | 2026-03-15 02:37:35 | MASTER-OAFA | (11h 42m 54.10s , -01d 47m 40.1s) | C | 180 | 20.4 | Coadd 49843 | 2026-03-15 02:38:40 | MASTER-OAFA | (11h 42m 54.00s , -01d 47m 39.9s) | C | 60 | 19.9 | 49909 | 2026-03-15 02:39:47 | MASTER-OAFA | (11h 42m 53.89s , -01d 47m 39.7s) | C | 60 | 19.9 | 49974 | 2026-03-15 02:40:52 | MASTER-OAFA | (11h 42m 53.81s , -01d 47m 39.7s) | C | 60 | 19.9 | 50034 | 2026-03-15 02:40:52 | MASTER-OAFA | (11h 42m 53.81s , -01d 47m 39.7s) | C | 180 | 20.4 | Coadd 50040 | 2026-03-15 02:41:57 | MASTER-OAFA | (11h 42m 53.70s , -01d 47m 39.5s) | C | 60 | 19.8 | 50106 | 2026-03-15 02:43:04 | MASTER-OAFA | (11h 42m 53.59s , -01d 47m 39.7s) | C | 60 | 19.9 | 50172 | 2026-03-15 02:44:10 | MASTER-OAFA | (11h 42m 53.49s , -01d 47m 39.9s) | C | 60 | 19.9 | 50232 | 2026-03-15 02:44:10 | MASTER-OAFA | (11h 42m 53.49s , -01d 47m 39.9s) | C | 180 | 20.4 | Coadd 50237 | 2026-03-15 02:45:15 | MASTER-OAFA | (11h 42m 53.37s , -01d 47m 40.1s) | C | 60 | 19.9 | 50304 | 2026-03-15 02:46:21 | MASTER-OAFA | (11h 42m 53.26s , -01d 47m 40.2s) | C | 60 | 19.8 | 50369 | 2026-03-15 02:47:27 | MASTER-OAFA | (11h 42m 53.14s , -01d 47m 40.1s) | C | 60 | 19.9 | 50429 | 2026-03-15 02:47:27 | MASTER-OAFA | (11h 42m 53.14s , -01d 47m 40.1s) | C | 180 | 20.0 | Coadd 50434 | 2026-03-15 02:48:32 | MASTER-OAFA | (11h 42m 53.02s , -01d 47m 40.5s) | C | 60 | 19.9 | 50500 | 2026-03-15 02:49:38 | MASTER-OAFA | (11h 42m 52.89s , -01d 47m 40.4s) | C | 60 | 19.9 | 50566 | 2026-03-15 02:50:44 | MASTER-OAFA | (11h 42m 52.77s , -01d 47m 40.4s) | C | 60 | 19.9 | 50626 | 2026-03-15 02:50:44 | MASTER-OAFA | (11h 42m 52.77s , -01d 47m 40.4s) | C | 180 | 20.4 | Coadd 50632 | 2026-03-15 02:51:49 | MASTER-OAFA | (11h 42m 52.64s , -01d 47m 40.6s) | C | 60 | 19.9 | 50698 | 2026-03-15 02:52:56 | MASTER-OAFA | (11h 42m 52.47s , -01d 47m 40.8s) | C | 60 | 19.9 | 50764 | 2026-03-15 02:54:02 | MASTER-OAFA | (11h 42m 52.36s , -01d 47m 41.4s) | C | 60 | 19.9 | 50824 | 2026-03-15 02:54:02 | MASTER-OAFA | (11h 42m 52.36s , -01d 47m 41.4s) | C | 180 | 20.0 | Coadd 50829 | 2026-03-15 02:55:07 | MASTER-OAFA | (11h 42m 52.22s , -01d 47m 41.7s) | C | 60 | 19.9 | 50896 | 2026-03-15 02:56:13 | MASTER-OAFA | (11h 42m 52.09s , -01d 47m 42.1s) | C | 60 | 19.9 | 50961 | 2026-03-15 02:57:19 | MASTER-OAFA | (11h 42m 51.92s , -01d 47m 42.9s) | C | 60 | 19.9 | 51021 | 2026-03-15 02:57:19 | MASTER-OAFA | (11h 42m 51.92s , -01d 47m 42.9s) | C | 180 | 20.0 | Coadd 51027 | 2026-03-15 02:58:24 | MASTER-OAFA | (11h 42m 51.79s , -01d 47m 43.3s) | C | 60 | 19.9 | 51093 | 2026-03-15 02:59:31 | MASTER-OAFA | (11h 42m 51.62s , -01d 47m 43.7s) | C | 60 | 19.9 | 51159 | 2026-03-15 03:00:36 | MASTER-OAFA | (11h 42m 51.50s , -01d 47m 44.1s) | C | 60 | 19.9 | 51219 | 2026-03-15 03:00:36 | MASTER-OAFA | (11h 42m 51.50s , -01d 47m 44.0s) | C | 180 | 20.0 | Coadd 51224 | 2026-03-15 03:01:42 | MASTER-OAFA | (11h 42m 51.36s , -01d 47m 44.9s) | C | 60 | 19.9 | 51291 | 2026-03-15 03:02:48 | MASTER-OAFA | (11h 42m 51.20s , -01d 47m 45.9s) | C | 60 | 19.9 | 51356 | 2026-03-15 03:03:54 | MASTER-OAFA | (11h 42m 51.07s , -01d 47m 46.3s) | C | 60 | 19.9 | 51416 | 2026-03-15 03:03:54 | MASTER-OAFA | (11h 42m 51.07s , -01d 47m 46.3s) | C | 180 | 20.0 | Coadd 51421 | 2026-03-15 03:04:59 | MASTER-OAFA | (11h 42m 50.89s , -01d 47m 46.6s) | C | 60 | 20.0 | 51488 | 2026-03-15 03:06:06 | MASTER-OAFA | (11h 42m 50.76s , -01d 47m 47.3s) | C | 60 | 19.9 | 51553 | 2026-03-15 03:07:11 | MASTER-OAFA | (11h 42m 50.58s , -01d 47m 48.2s) | C | 60 | 19.9 | 51613 | 2026-03-15 03:07:11 | MASTER-OAFA | (11h 42m 50.58s , -01d 47m 48.2s) | C | 180 | 20.0 | Coadd 51619 | 2026-03-15 03:08:17 | MASTER-OAFA | (11h 42m 50.44s , -01d 47m 49.1s) | C | 60 | 19.9 | 51686 | 2026-03-15 03:09:24 | MASTER-OAFA | (11h 42m 50.31s , -01d 47m 49.8s) | C | 60 | 19.9 | 51751 | 2026-03-15 03:10:29 | MASTER-OAFA | (11h 42m 50.15s , -01d 47m 50.8s) | C | 60 | 19.9 | 51811 | 2026-03-15 03:10:29 | MASTER-OAFA | (11h 42m 50.15s , -01d 47m 50.8s) | C | 180 | 20.0 | Coadd 51816 | 2026-03-15 03:11:34 | MASTER-OAFA | (11h 42m 50.01s , -01d 47m 51.7s) | C | 60 | 19.9 | 51883 | 2026-03-15 03:12:40 | MASTER-OAFA | (11h 42m 49.85s , -01d 47m 53.2s) | C | 60 | 19.9 | 51948 | 2026-03-15 03:13:46 | MASTER-OAFA | (11h 42m 49.69s , -01d 47m 53.9s) | C | 60 | 19.9 | 52008 | 2026-03-15 03:13:46 | MASTER-OAFA | (11h 42m 49.69s , -01d 47m 53.9s) | C | 180 | 20.0 | Coadd 52014 | 2026-03-15 03:14:51 | MASTER-OAFA | (11h 42m 49.52s , -01d 47m 54.8s) | C | 60 | 19.9 | 52080 | 2026-03-15 03:15:58 | MASTER-OAFA | (11h 42m 49.36s , -01d 47m 55.6s) | C | 60 | 19.9 | 52146 | 2026-03-15 03:17:03 | MASTER-OAFA | (11h 42m 49.19s , -01d 47m 56.2s) | C | 60 | 19.9 | 52206 | 2026-03-15 03:17:03 | MASTER-OAFA | (11h 42m 49.19s , -01d 47m 56.2s) | C | 180 | 20.0 | Coadd 52211 | 2026-03-15 03:18:09 | MASTER-OAFA | (11h 42m 49.02s , -01d 47m 57.7s) | C | 60 | 19.9 | 52277 | 2026-03-15 03:19:14 | MASTER-OAFA | (11h 42m 48.86s , -01d 47m 58.8s) | C | 60 | 19.9 | 52342 | 2026-03-15 03:20:20 | MASTER-OAFA | (11h 42m 48.71s , -01d 48m 00.4s) | C | 60 | 19.9 | 52408 | 2026-03-15 03:21:26 | MASTER-OAFA | (11h 42m 48.52s , -01d 48m 01.7s) | C | 60 | 19.9 | 52474 | 2026-03-15 03:22:32 | MASTER-OAFA | (11h 42m 48.36s , -01d 48m 02.8s) | C | 60 | 19.9 | 52540 | 2026-03-15 03:23:37 | MASTER-OAFA | (11h 42m 48.20s , -01d 48m 04.0s) | C | 60 | 19.9 | 52605 | 2026-03-15 03:24:43 | MASTER-OAFA | (11h 42m 48.01s , -01d 48m 05.0s) | C | 60 | 19.9 | 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/44012. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42132] IceCube Alert 260315A: Global MASTER-Net observations report
by GCN Circulars 15 Mar '26

15 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44011 SUBJECT: IceCube Alert 260315A: Global MASTER-Net observations report DATE: 26/03/15 02:40:16 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) was pointed to the IceCube Alert 260315A (trigger No 46886533,11h 42m 40.32s , -01d 53m 06.0s, R=0.71) errorbox 105 sec after notice time and 224 sec after trigger time at 2026-03-15 02:22:50 UT, with upper limit up to 20.4 mag. The observations began at zenith distance = 45 deg. The sun altitude is -42.8 deg. The galactic latitude b = 57 deg., longitude l = 272 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3187113 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 244 | 2026-03-15 02:22:50 | MASTER-OAFA | (11h 42m 55.30s , -01d 47m 48.0s) | C | 40 | 19.7 | 304 | 2026-03-15 02:22:50 | MASTER-OAFA | (11h 42m 55.30s , -01d 47m 48.0s) | C | 160 | 20.4 | Coadd 295 | 2026-03-15 02:23:36 | MASTER-OAFA | (11h 42m 55.23s , -01d 47m 46.9s) | C | 50 | 19.8 | 361 | 2026-03-15 02:24:32 | MASTER-OAFA | (11h 42m 55.19s , -01d 47m 45.7s) | C | 70 | 19.9 | 442 | 2026-03-15 02:25:48 | MASTER-OAFA | (11h 42m 55.10s , -01d 47m 45.0s) | C | 80 | 19.9 | 552 | 2026-03-15 02:25:48 | MASTER-OAFA | (11h 42m 55.10s , -01d 47m 45.0s) | C | 300 | 20.0 | Coadd 539 | 2026-03-15 02:27:15 | MASTER-OAFA | (11h 42m 54.96s , -01d 47m 43.8s) | C | 100 | 20.0 | 655 | 2026-03-15 02:29:01 | MASTER-OAFA | (11h 42m 54.80s , -01d 47m 42.7s) | C | 120 | 20.1 | 790 | 2026-03-15 02:31:07 | MASTER-OAFA | (11h 42m 54.61s , -01d 47m 41.6s) | C | 140 | 20.2 | 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/44011. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42131] EP260314a: Einstein Probe detection of an X-ray transient
by GCN Circulars 15 Mar '26

15 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44010 SUBJECT: EP260314a: Einstein Probe detection of an X-ray transient DATE: 26/03/15 02:16:51 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> Yaqi Zhao (USTC, PRIC), Yue Wu (NJU), Rui-Zhi Li (YNAO, CAS) and Hai-Wu Pan (NAOC) on behalf of the Einstein Probe (EP) team: We report on the detection of an X-ray transient by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission, designated EP260314a. The transient triggered EP-WXT (ID: 01709258851) at 2026-03-14T22:51:36 (UTC). The WXT position of the source is R.A. = 211.845 deg, DEC = -23.445 deg (J2000) with an uncertainty of 3 arcmin in radius (90% C.L. statistical and systematic). A follow-up observation with the Follow-up X-ray Telescope (FXT) was performed automatically. Within the WXT error circle, an uncatalogued X-ray source was detected at R.A. = 211.8437 deg, DEC = -23.4601 deg (J2000) with an uncertainty of 20 arcsec in radius (90% C.L. statistical and systematic). Further information will be updated when the telemetry data is received. Launched on January 9, 2024, EP is a space X-ray observatory to monitor the soft X-ray sky with X-ray follow-up capability (Yuan et al. 2022, Handbook of X-ray and Gamma-ray Astrophysics). View this GCN Circular online at https://gcn.nasa.gov/circulars/44010. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42130] The EP-WXT trigger 01709258851: Las Cumbres upper limit
by GCN Circulars 15 Mar '26

15 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44009 SUBJECT: The EP-WXT trigger 01709258851: Las Cumbres upper limit DATE: 26/03/15 01:07:35 GMT FROM: Wenxiong Li at NAOC <liwenxiong1992(a)gmail.com> Wenxiong Li, Runduo Liang (NAOC), Iair Arcavi, Ido Keinan (TAU), David Sand (U of Arizona) We observed the position of the EP-WXT trigger 01709258851 with a Las Cumbres 1m telescope at Sutherland Observatory, South Africa, 50 mins after the Einstein Probe WXT trigger. We took 4x300s exposures in the broad optical w band. We didn’t detect any uncataloged source within the EP-WXT error circle down to a limiting r-band mag of 21.5 mag. View this GCN Circular online at https://gcn.nasa.gov/circulars/44009. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42129] GRB 260314A: GECAM-B observation of a burst
by GCN Circulars 15 Mar '26

15 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44008 SUBJECT: GRB 260314A: GECAM-B observation of a burst DATE: 26/03/15 01:04:49 GMT FROM: xueyuan zao <zaoxueyuan(a)gmail.com> Xue-Yuan Zao, Chen-Wei Wang, Shao-Lin Xiong (IHEP) report on behalf of GECAM team: GECAM-B was triggered on-ground by GRB 260314A, at 2026-03-14T00:58:53.100 UTC, which is also detected by Fermi/GBM (Fermi GBM team, GCN #43997). The GECAM-B light curve can be found here: https://www.bursthub.cn//admin/static/gecambgrb260314A.png Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) mission originally consists of two micro-satellites (GECAM-A and GECAM-B) launched in Dec. 2020. As the third member of GECAM constellation, GECAM-C was launched onboard SATech-01 experimental satellite in July 2022. GECAM mission is funded by the Chinese Academy of Sciences (CAS). View this GCN Circular online at https://gcn.nasa.gov/circulars/44008. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42128] Fermi Gamma-ray Burst Monitor trigger 795185313/260314534 is not a GRB
by GCN Circulars 14 Mar '26

14 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44007 SUBJECT: Fermi Gamma-ray Burst Monitor trigger 795185313/260314534 is not a GRB DATE: 26/03/14 18:19:35 GMT FROM: Bagrat Mailyan at Florida Tech <mbagrat(a)gmail.com> B. Mailyan (Florida Tech) reports on behalf of the Fermi Gamma-ray Burst Monitor Team: "The Fermi Gamma-ray Burst Monitor (GBM) trigger 795185313/260314534 at 12:48:28.23 UT on 14 March 2026, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is likely accidental." View this GCN Circular online at https://gcn.nasa.gov/circulars/44007. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42127] GRB 260310A / AT2026fgk: SAO RAS optical observations
by GCN Circulars 14 Mar '26

14 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44006 SUBJECT: GRB 260310A / AT2026fgk: SAO RAS optical observations DATE: 26/03/14 15:46:52 GMT FROM: Alexander Moskvitin at SAO RAS <mosk(a)sao.ru> A. Moskvitin (SAO RAS), O. Spiridonova (SAO RAS), A. Pozanenko (IKI), N. Pankov (IKI), A. Volnova (IKI), report on behalf of GRB follow-up team and IKI-GRB-FuN. We observed the field of the AT2026fgk, potential counterpart of the GRB 260310A (Fermi GBM team, GCN 43951; Hamburg and Meegan, GCN 43975; Salunke et al., GCN 43958) with the Zeiss-1000 1m telescope of the SAO RAS equipped with the CCD photometer. We obtained series of 300 sec images in B, V, Rc, Ic filters on March 12/13 and 13/14. The observations carried out under a good weather conditions and typical seeing of 1".5--2".5. The candidate discovered by GOTO (O'Neill et al. 2026, TNS Discovery Report 294132) and observed by numerous observatories (Konno et al., GCN 43974; Hinds et al., GCN 43977; Lipunov et al., GCN 43978; Martin-Carrillo et al., GCN 43979; Moren Méndez et al., GCN 43980; de Ugarte Postigo et al., GCN 43984; Hsu et al., GCN 43986; Pursiainen et al., GCN 43990; Becerra et al., GCN 43991; Li et al., GCN 43993; Jayaraman et al., GCN 43994; Stein et al., GCN 43996; Martin-Carrillo et al., GCN 44000; Watson et al., GCN 44001; Lai et al., GCN 44002; Izzo, GCN 44003; Brivio et al., GCN 44004; Rhodes et al., GCN 44005) is clearly detected in our images with the following brightness. Date UT_start t_mid - T0, filter exp, mag +/- err days s 2026.03.12T23:27:00 2.80565 B 5*300 18.77 +/- 0.01 2026.03.12T23:09:50 2.79577 Rc 6*300 18.00 +/- 0.01 2026.03.13T23:56:42 3.82450 B 5*300 18.92 +/- 0.01 2026.03.13T23:45:30 3.81664 Rc 4*300 18.14 +/- 0.01 This preliminary photometry is based on the nearby stars from PanSTARRS catalogue. Magnitudes of standards converted to B, Rc with the Lupton 2005 equations. The magnitudes of the AT2026fgk are not corrected for Galactic and host extinction and may be contaminated by the host galaxy. We can not trace any colour evolution between the two epochs (2.8 and 3.8 days after GRB trigger). View this GCN Circular online at https://gcn.nasa.gov/circulars/44006. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42126] GRB 260310A/AT 2026fgk: radio detection at 15GHz
by GCN Circulars 14 Mar '26

14 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44005 SUBJECT: GRB 260310A/AT 2026fgk: radio detection at 15GHz DATE: 26/03/14 15:23:56 GMT FROM: Lauren Rhodes at McGill <lauren.rhodes(a)mcgill.ca> Lauren Rhodes (McGill), Andrew Hughes, Rob Fender (Oxford), Joe Bright (Oxford/Breakthrough Listen), Dave Green, Dave Titterington (Cambridge) report: We observed the position of GRB 260310A/AT 2026fgk (Fermi GBM Team, GCN 43951; Konno et al., GCN 43974; Hinds et al., AstroNote 2026-65; O’Neill et al. 2026, TNS Discovery Report 294132) with the Arcminute Microkelvin Imager Large-Array (AMI-LA) at 15.2 GHz beginning at 2026 March 13 23:20:06 for a total of 8 hours. The flux standard 3c286 was used to calibrate the bandpass response and flux scale of the AMI-LA and J1435+7605 was used as an interleaved complex gain calibrator. We detect an unresolved source with coordinates consistent with those of GRB 260310A/AT 2026fgk. We measure a peak flux density of 9.8 +/- 0.5 mJy/beam. Given the high flux density of the source, we cross checked with the VLASS survey and find no preexisting radio emission at the afterglow coordinates down to a 3sigma upper limit of around 0.5mJy/beam. We thank the staff at the Mullard Radio Astronomy Observatory for carrying out these observations and operating the AMI-LA. View this GCN Circular online at https://gcn.nasa.gov/circulars/44005. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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