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[vsnet-grb-info 43276] Fermi trigger No 804552016: Global MASTER-Net observations report
by GCN Circulars 01 Jul '26

01 Jul '26

TITLE: GCN CIRCULAR NUMBER: 45061 SUBJECT: Fermi trigger No 804552016: Global MASTER-Net observations report DATE: 26/07/01 04:03:47 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), M. Segura, 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 GRB260630.94 (trigger No 804552016,12h 45m 31.92s , -37d 28m 01.2s, R=50) errorbox 1803 sec after notice time and 1868 sec after trigger time at 2026-06-30 23:11:19 UT, with upper limit up to 19.9 mag. The observations began at zenith distance = 13 deg. The sun altitude is -18.4 deg. MASTER-OAGH robotic telescope located in Mexico (OAGH National Institute for Astrophysics, Optics and Electronics) started inspect of the Fermi GRB260630.94 errorbox 17793 sec after notice time and 17858 sec after trigger time at 2026-07-01 03:37:49 UT, with upper limit up to 18.5 mag. Observations started at twilight. The observations began at zenith distance = 56 deg. The sun altitude is -13.4 deg. The galactic latitude b = 25 deg., longitude l = 302 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3408638 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 1898 | 2026-06-30 23:11:19 | MASTER-OAFA | (12h 11m 25.61s , -30d 50m 47.7s) | C | 60 | 19.5 | 1958 | 2026-06-30 23:11:19 | MASTER-OAFA | (12h 11m 25.61s , -30d 50m 47.8s) | C | 180 | 19.9 | Coadd 1978 | 2026-06-30 23:12:39 | MASTER-OAFA | (12h 11m 31.14s , -30d 50m 34.0s) | C | 60 | 19.4 | 2059 | 2026-06-30 23:14:00 | MASTER-OAFA | (12h 11m 28.06s , -30d 49m 04.0s) | C | 60 | 19.4 | 2138 | 2026-06-30 23:15:19 | MASTER-OAFA | (12h 11m 28.19s , -30d 50m 41.2s) | C | 60 | 19.3 | 2216 | 2026-06-30 23:16:37 | MASTER-OAFA | (12h 11m 32.25s , -30d 48m 51.7s) | C | 60 | 19.2 | 2294 | 2026-06-30 23:17:55 | MASTER-OAFA | (12h 02m 07.33s , -30d 49m 49.7s) | C | 60 | 19.0 | 2354 | 2026-06-30 23:17:55 | MASTER-OAFA | (12h 02m 07.33s , -30d 49m 49.7s) | C | 180 | 19.0 | Coadd 2372 | 2026-06-30 23:19:13 | MASTER-OAFA | (12h 11m 24.61s , -30d 48m 48.1s) | C | 60 | 18.9 | 2448 | 2026-06-30 23:20:29 | MASTER-OAFA | (12h 02m 12.98s , -30d 49m 50.1s) | C | 60 | 18.9 | 2749 | 2026-06-30 23:25:30 | MASTER-OAFA | (12h 58m 02.91s , -08d 06m 38.4s) | C | 60 | 19.1 | 2809 | 2026-06-30 23:25:30 | MASTER-OAFA | (12h 58m 02.90s , -08d 06m 38.4s) | C | 180 | 19.6 | Coadd 2826 | 2026-06-30 23:26:46 | MASTER-OAFA | (12h 58m 02.37s , -08d 08m 12.8s) | C | 60 | 19.0 | 2904 | 2026-06-30 23:28:05 | MASTER-OAFA | (12h 58m 04.68s , -08d 06m 41.8s) | C | 60 | 19.1 | 2980 | 2026-06-30 23:29:21 | MASTER-OAFA | (13h 06m 04.75s , -08d 07m 00.9s) | C | 60 | 19.0 | 3040 | 2026-06-30 23:29:21 | MASTER-OAFA | (13h 06m 04.74s , -08d 07m 00.9s) | C | 180 | 19.0 | Coadd 3134 | 2026-06-30 23:31:55 | MASTER-OAFA | (12h 58m 04.43s , -08d 07m 27.2s) | C | 60 | 19.0 | 3194 | 2026-06-30 23:31:55 | MASTER-OAFA | (12h 58m 04.43s , -08d 07m 27.2s) | C | 180 | 19.4 | Coadd 3212 | 2026-06-30 23:33:12 | MASTER-OAFA | (12h 57m 59.16s , -08d 08m 30.6s) | C | 60 | 18.8 | 3288 | 2026-06-30 23:34:28 | MASTER-OAFA | (13h 06m 11.15s , -08d 08m 08.0s) | C | 60 | 18.8 | 3364 | 2026-06-30 23:35:44 | MASTER-OAFA | (12h 58m 00.86s , -08d 06m 45.7s) | C | 60 | 18.8 | 3708 | 2026-06-30 23:41:28 | MASTER-OAFA | (13h 29m 34.56s , -32d 43m 04.8s) | C | 60 | 19.4 | 3768 | 2026-06-30 23:41:28 | MASTER-OAFA | (13h 29m 34.56s , -32d 43m 04.8s) | C | 180 | 19.7 | Coadd 3784 | 2026-06-30 23:42:45 | MASTER-OAFA | (13h 29m 35.05s , -32d 44m 23.8s) | C | 60 | 19.4 | 3862 | 2026-06-30 23:44:02 | MASTER-OAFA | (13h 29m 38.07s , -32d 43m 17.3s) | C | 60 | 19.4 | 3939 | 2026-06-30 23:45:20 | MASTER-OAFA | (13h 39m 02.97s , -32d 44m 06.5s) | C | 60 | 19.3 | 3999 | 2026-06-30 23:45:20 | MASTER-OAFA | (13h 39m 02.97s , -32d 44m 06.5s) | C | 180 | 19.6 | Coadd 4017 | 2026-06-30 23:46:38 | MASTER-OAFA | (13h 39m 02.76s , -32d 43m 06.1s) | C | 60 | 19.2 | 4094 | 2026-06-30 23:47:55 | MASTER-OAFA | (13h 39m 07.91s , -32d 44m 05.9s) | C | 60 | 19.3 | 4172 | 2026-06-30 23:49:13 | MASTER-OAFA | (13h 29m 32.87s , -32d 44m 51.7s) | C | 60 | 19.4 | 4232 | 2026-06-30 23:49:13 | MASTER-OAFA | (13h 29m 32.86s , -32d 44m 51.7s) | C | 180 | 19.3 | Coadd 4250 | 2026-06-30 23:50:30 | MASTER-OAFA | (13h 39m 08.83s , -32d 44m 50.3s) | C | 60 | 19.2 | 4310 | 2026-06-30 23:50:30 | MASTER-OAFA | (13h 39m 08.81s , -32d 44m 50.5s) | C | 180 | 19.1 | Coadd 4328 | 2026-06-30 23:51:49 | MASTER-OAFA | (13h 29m 36.06s , -32d 43m 17.9s) | C | 60 | 19.1 | 4411 | 2026-06-30 23:53:12 | MASTER-OAFA | (12h 11m 32.66s , -30d 50m 22.0s) | C | 60 | 19.0 | 4471 | 2026-06-30 23:53:12 | MASTER-OAFA | (12h 11m 32.66s , -30d 50m 22.1s) | C | 180 | 19.6 | Coadd 4488 | 2026-06-30 23:54:29 | MASTER-OAFA | (12h 11m 34.87s , -30d 48m 42.2s) | C | 60 | 18.9 | 4564 | 2026-06-30 23:55:44 | MASTER-OAFA | (12h 11m 29.95s , -30d 49m 39.6s) | C | 60 | 19.0 | 4642 | 2026-06-30 23:57:03 | MASTER-OAFA | (12h 11m 30.45s , -30d 48m 40.6s) | C | 60 | 18.9 | 4702 | 2026-06-30 23:57:03 | MASTER-OAFA | (12h 11m 30.45s , -30d 48m 40.6s) | C | 180 | 19.0 | Coadd 4717 | 2026-06-30 23:58:18 | MASTER-OAFA | (12h 11m 37.03s , -30d 49m 41.0s) | C | 60 | 19.0 | 4838 | 2026-07-01 00:00:19 | MASTER-OAFA | (12h 02m 16.96s , -30d 53m 15.9s) | C | 60 | 19.1 | 4913 | 2026-07-01 00:01:34 | MASTER-OAFA | (12h 02m 22.35s , -30d 52m 45.4s) | C | 60 | 19.1 | 4973 | 2026-07-01 00:01:34 | MASTER-OAFA | (12h 02m 22.35s , -30d 52m 45.4s) | C | 180 | 19.8 | Coadd 4992 | 2026-07-01 00:02:53 | MASTER-OAFA | (12h 02m 19.87s , -30d 51m 37.4s) | C | 60 | 19.2 | 5069 | 2026-07-01 00:04:10 | MASTER-OAFA | (12h 02m 19.89s , -30d 52m 56.2s) | C | 60 | 19.1 | 5147 | 2026-07-01 00:05:27 | MASTER-OAFA | (12h 02m 22.84s , -30d 51m 33.7s) | C | 60 | 19.1 | 5229 | 2026-07-01 00:06:49 | MASTER-OAFA | (13h 06m 33.42s , -08d 06m 03.6s) | C | 60 | 19.3 | 5307 | 2026-07-01 00:08:08 | MASTER-OAFA | (13h 06m 33.42s , -08d 05m 01.6s) | C | 60 | 19.3 | 5367 | 2026-07-01 00:08:08 | MASTER-OAFA | (13h 06m 33.42s , -08d 05m 01.6s) | C | 180 | 19.7 | Coadd 5385 | 2026-07-01 00:09:26 | MASTER-OAFA | (13h 06m 39.16s , -08d 05m 59.4s) | C | 60 | 19.3 | 5461 | 2026-07-01 00:10:42 | MASTER-OAFA | (13h 06m 32.29s , -08d 06m 57.7s) | C | 60 | 19.2 | 5538 | 2026-07-01 00:11:58 | MASTER-OAFA | (13h 06m 38.41s , -08d 06m 40.7s) | C | 60 | 19.1 | 5615 | 2026-07-01 00:13:16 | MASTER-OAFA | (12h 58m 30.86s , -08d 05m 10.5s) | C | 60 | 19.0 | 5675 | 2026-07-01 00:13:16 | MASTER-OAFA | (12h 58m 30.86s , -08d 05m 10.6s) | C | 180 | 19.5 | Coadd 5694 | 2026-07-01 00:14:35 | MASTER-OAFA | (12h 58m 30.88s , -08d 06m 11.4s) | C | 60 | 19.1 | 5772 | 2026-07-01 00:15:53 | MASTER-OAFA | (12h 58m 34.85s , -08d 04m 57.2s) | C | 60 | 19.0 | 5847 | 2026-07-01 00:17:08 | MASTER-OAFA | (12h 58m 28.36s , -08d 05m 36.1s) | C | 60 | 19.1 | 5925 | 2026-07-01 00:18:25 | MASTER-OAFA | (12h 58m 27.98s , -08d 04m 34.8s) | C | 60 | 19.0 | 6062 | 2026-07-01 00:20:43 | MASTER-OAFA | (13h 39m 16.94s , -32d 47m 14.9s) | C | 60 | 19.4 | 6142 | 2026-07-01 00:22:02 | MASTER-OAFA | (13h 39m 11.65s , -32d 48m 11.8s) | C | 60 | 19.4 | 6218 | 2026-07-01 00:23:19 | MASTER-OAFA | (13h 39m 11.42s , -32d 47m 10.5s) | C | 60 | 19.3 | 6278 | 2026-07-01 00:23:19 | MASTER-OAFA | (13h 39m 11.42s , -32d 47m 10.5s) | C | 180 | 19.7 | Coadd 6295 | 2026-07-01 00:24:35 | MASTER-OAFA | (13h 39m 19.09s , -32d 48m 09.4s) | C | 60 | 19.3 | 6371 | 2026-07-01 00:25:51 | MASTER-OAFA | (13h 39m 12.39s , -32d 49m 07.8s) | C | 60 | 19.4 | 6448 | 2026-07-01 00:27:09 | MASTER-OAFA | (13h 29m 47.65s , -32d 48m 43.5s) | C | 60 | 19.3 | 6524 | 2026-07-01 00:28:25 | MASTER-OAFA | (13h 29m 45.29s , -32d 47m 10.8s) | C | 60 | 19.3 | 6584 | 2026-07-01 00:28:25 | MASTER-OAFA | (13h 29m 45.28s , -32d 47m 10.9s) | C | 180 | 19.8 | Coadd 6601 | 2026-07-01 00:29:41 | MASTER-OAFA | (13h 29m 45.34s , -32d 48m 40.8s) | C | 60 | 19.3 | 6676 | 2026-07-01 00:30:57 | MASTER-OAFA | (13h 29m 47.61s , -32d 46m 47.9s) | C | 60 | 19.3 | 6754 | 2026-07-01 00:32:14 | MASTER-OAFA | (13h 29m 42.31s , -32d 47m 40.8s) | C | 60 | 19.3 | 6814 | 2026-07-01 00:32:14 | MASTER-OAFA | (13h 29m 42.31s , -32d 47m 40.8s) | C | 180 | 19.6 | Coadd 6834 | 2026-07-01 00:33:35 | MASTER-OAFA | (12h 11m 36.74s , -30d 51m 08.0s) | C | 60 | 19.1 | 6925 | 2026-07-01 00:35:06 | MASTER-OAFA | (13h 30m 52.07s , -30d 52m 56.4s) | C | 60 | 19.3 | 6985 | 2026-07-01 00:35:06 | MASTER-OAFA | (13h 30m 52.06s , -30d 52m 56.4s) | C | 180 | 19.8 | Coadd 7001 | 2026-07-01 00:36:22 | MASTER-OAFA | (13h 40m 11.04s , -30d 54m 55.4s) | C | 60 | 19.4 | 7061 | 2026-07-01 00:36:22 | MASTER-OAFA | (13h 40m 11.04s , -30d 54m 55.5s) | C | 180 | 19.6 | Coadd 7081 | 2026-07-01 00:37:42 | MASTER-OAFA | (13h 30m 55.07s , -30d 52m 47.7s) | C | 60 | 19.3 | 7159 | 2026-07-01 00:39:00 | MASTER-OAFA | (13h 40m 08.36s , -30d 53m 55.0s) | C | 60 | 19.4 | 7235 | 2026-07-01 00:40:16 | MASTER-OAFA | (13h 30m 49.15s , -30d 52m 34.4s) | C | 60 | 19.4 | 7327 | 2026-07-01 00:41:48 | MASTER-OAFA | (13h 51m 10.27s , -38d 31m 01.8s) | C | 60 | 19.1 | 7387 | 2026-07-01 00:41:48 | MASTER-OAFA | (13h 51m 10.27s , -38d 31m 01.8s) | C | 180 | 19.4 | Coadd 7405 | 2026-07-01 00:43:05 | MASTER-OAFA | (14h 01m 25.47s , -38d 29m 55.5s) | C | 60 | 18.9 | 7465 | 2026-07-01 00:43:05 | MASTER-OAFA | (14h 01m 25.47s , -38d 29m 55.5s) | C | 180 | 19.3 | Coadd 7481 | 2026-07-01 00:44:22 | MASTER-OAFA | (13h 51m 07.32s , -38d 30m 18.7s) | C | 60 | 19.0 | 7558 | 2026-07-01 00:45:39 | MASTER-OAFA | (14h 01m 19.65s , -38d 29m 42.0s) | C | 60 | 18.9 | 7641 | 2026-07-01 00:47:01 | MASTER-OAFA | (13h 51m 14.42s , -38d 30m 16.4s) | C | 60 | 19.1 | 7739 | 2026-07-01 00:48:39 | MASTER-OAFA | (13h 51m 13.52s , -38d 30m 14.6s) | C | 60 | 19.1 | 7799 | 2026-07-01 00:48:39 | MASTER-OAFA | (13h 51m 13.52s , -38d 30m 14.6s) | C | 180 | 19.4 | Coadd 7816 | 2026-07-01 00:49:57 | MASTER-OAFA | (14h 01m 21.32s , -38d 31m 38.0s) | C | 60 | 18.9 | 7895 | 2026-07-01 00:51:15 | MASTER-OAFA | (13h 51m 13.92s , -38d 31m 00.1s) | C | 60 | 19.1 | 7972 | 2026-07-01 00:52:32 | MASTER-OAFA | (14h 01m 24.56s , -38d 30m 01.9s) | C | 60 | 18.9 | 8032 | 2026-07-01 00:52:32 | MASTER-OAFA | (14h 01m 24.56s , -38d 30m 01.9s) | C | 180 | 19.3 | Coadd 8050 | 2026-07-01 00:53:51 | MASTER-OAFA | (13h 51m 12.09s , -38d 30m 58.1s) | C | 60 | 19.1 | 8134 | 2026-07-01 00:55:14 | MASTER-OAFA | (13h 29m 00.78s , -17d 35m 39.1s) | C | 60 | 19.1 | 8194 | 2026-07-01 00:55:14 | MASTER-OAFA | (13h 29m 00.77s , -17d 35m 39.2s) | C | 180 | 19.7 | Coadd 8210 | 2026-07-01 00:56:31 | MASTER-OAFA | (13h 37m 24.55s , -17d 34m 52.7s) | C | 60 | 19.0 | 8288 | 2026-07-01 00:57:49 | MASTER-OAFA | (13h 29m 07.73s , -17d 35m 36.1s) | C | 60 | 19.1 | 8366 | 2026-07-01 00:59:07 | MASTER-OAFA | (13h 37m 23.96s , -17d 36m 49.7s) | C | 60 | 19.0 | 8444 | 2026-07-01 01:00:24 | MASTER-OAFA | (13h 29m 06.38s , -17d 36m 28.6s) | C | 60 | 18.9 | 8525 | 2026-07-01 01:01:45 | MASTER-OAFA | (13h 39m 18.46s , -32d 46m 40.9s) | C | 60 | 19.2 | 8585 | 2026-07-01 01:01:45 | MASTER-OAFA | (13h 39m 18.46s , -32d 46m 40.9s) | C | 180 | 19.6 | Coadd 8600 | 2026-07-01 01:03:01 | MASTER-OAFA | (13h 39m 18.53s , -32d 48m 05.0s) | C | 60 | 19.3 | 8675 | 2026-07-01 01:04:16 | MASTER-OAFA | (13h 39m 22.21s , -32d 46m 34.7s) | C | 60 | 19.2 | 8755 | 2026-07-01 01:05:35 | MASTER-OAFA | (13h 39m 16.17s , -32d 47m 27.7s) | C | 60 | 19.3 | 8815 | 2026-07-01 01:05:35 | MASTER-OAFA | (13h 39m 16.17s , -32d 47m 27.8s) | C | 180 | 19.6 | Coadd 8831 | 2026-07-01 01:06:52 | MASTER-OAFA | (13h 39m 16.64s , -32d 46m 26.5s) | C | 60 | 19.4 | 8913 | 2026-07-01 01:08:14 | MASTER-OAFA | (13h 29m 51.36s , -32d 47m 09.4s) | C | 60 | 19.2 | 8991 | 2026-07-01 01:09:32 | MASTER-OAFA | (13h 29m 45.00s , -32d 48m 08.2s) | C | 60 | 19.1 | 9067 | 2026-07-01 01:10:47 | MASTER-OAFA | (13h 29m 50.84s , -32d 47m 47.2s) | C | 60 | 19.2 | 9127 | 2026-07-01 01:10:47 | MASTER-OAFA | (13h 29m 50.84s , -32d 47m 47.2s) | C | 180 | 19.7 | Coadd 9145 | 2026-07-01 01:12:05 | MASTER-OAFA | (13h 29m 48.76s , -32d 46m 34.4s) | C | 60 | 19.2 | 9223 | 2026-07-01 01:13:24 | MASTER-OAFA | (13h 29m 48.84s , -32d 47m 47.3s) | C | 60 | 19.0 | 9302 | 2026-07-01 01:14:43 | MASTER-OAFA | (13h 40m 17.47s , -30d 52m 37.2s) | C | 60 | 19.1 | 9381 | 2026-07-01 01:16:02 | MASTER-OAFA | (13h 40m 11.75s , -30d 53m 21.5s) | C | 60 | 19.1 | 9441 | 2026-07-01 01:16:02 | MASTER-OAFA | (13h 40m 11.75s , -30d 53m 21.5s) | C | 180 | 19.6 | Coadd 9459 | 2026-07-01 01:17:20 | MASTER-OAFA | (13h 40m 10.41s , -30d 52m 20.2s) | C | 60 | 19.1 | 9535 | 2026-07-01 01:18:36 | MASTER-OAFA | (13h 30m 58.31s , -30d 53m 04.4s) | C | 60 | 19.0 | 9595 | 2026-07-01 01:18:36 | MASTER-OAFA | (13h 30m 58.30s , -30d 53m 04.4s) | C | 180 | 19.6 | Coadd 9618 | 2026-07-01 01:19:59 | MASTER-OAFA | (13h 30m 51.91s , -30d 54m 03.6s) | C | 60 | 19.0 | 9693 | 2026-07-01 01:21:14 | MASTER-OAFA | (13h 30m 58.11s , -30d 53m 41.0s) | C | 60 | 19.1 | 9772 | 2026-07-01 01:22:33 | MASTER-OAFA | (14h 01m 27.59s , -38d 29m 07.2s) | C | 60 | 18.8 | 9849 | 2026-07-01 01:23:50 | MASTER-OAFA | (14h 01m 27.70s , -38d 30m 30.8s) | C | 60 | 18.8 | 9928 | 2026-07-01 01:25:08 | MASTER-OAFA | (14h 01m 30.73s , -38d 29m 04.0s) | C | 60 | 18.8 | 9988 | 2026-07-01 01:25:08 | MASTER-OAFA | (14h 01m 30.72s , -38d 29m 04.0s) | C | 180 | 19.4 | Coadd 10007 | 2026-07-01 01:26:27 | MASTER-OAFA | (13h 51m 12.13s , -38d 29m 36.3s) | C | 60 | 18.9 | 10067 | 2026-07-01 01:26:27 | MASTER-OAFA | (13h 51m 12.13s , -38d 29m 36.3s) | C | 180 | 19.3 | Coadd 10082 | 2026-07-01 01:27:43 | MASTER-OAFA | (13h 51m 12.62s , -38d 28m 35.1s) | C | 60 | 18.8 | 10162 | 2026-07-01 01:29:02 | MASTER-OAFA | (13h 51m 17.78s , -38d 29m 34.3s) | C | 60 | 18.8 | 10240 | 2026-07-01 01:30:21 | MASTER-OAFA | (14h 01m 25.20s , -38d 30m 53.5s) | C | 60 | 18.8 | 10317 | 2026-07-01 01:31:38 | MASTER-OAFA | (14h 01m 31.41s , -38d 30m 29.4s) | C | 60 | 19.0 | 10394 | 2026-07-01 01:32:55 | MASTER-OAFA | (14h 01m 28.69s , -38d 29m 07.7s) | C | 60 | 19.0 | 10454 | 2026-07-01 01:32:55 | MASTER-OAFA | (14h 01m 28.69s , -38d 29m 07.7s) | C | 180 | 19.1 | Coadd 10474 | 2026-07-01 01:34:14 | MASTER-OAFA | (13h 51m 16.14s , -38d 30m 06.1s) | C | 60 | 19.0 | 10534 | 2026-07-01 01:34:14 | MASTER-OAFA | (13h 51m 16.14s , -38d 30m 06.1s) | C | 180 | 19.4 | Coadd 10549 | 2026-07-01 01:35:30 | MASTER-OAFA | (13h 51m 20.22s , -38d 28m 38.4s) | C | 60 | 19.0 | 10628 | 2026-07-01 01:36:48 | MASTER-OAFA | (13h 51m 13.53s , -38d 29m 29.0s) | C | 60 | 19.0 | 10711 | 2026-07-01 01:38:11 | MASTER-OAFA | (13h 39m 17.94s , -32d 48m 04.9s) | C | 60 | 19.0 | 10785 | 2026-07-01 01:39:25 | MASTER-OAFA | (13h 39m 24.50s , -32d 48m 00.2s) | C | 60 | 19.0 | 10845 | 2026-07-01 01:39:25 | MASTER-OAFA | (13h 39m 24.49s , -32d 48m 00.2s) | C | 180 | 19.5 | Coadd 10861 | 2026-07-01 01:40:42 | MASTER-OAFA | (13h 39m 21.37s , -32d 46m 32.7s) | C | 60 | 19.0 | 10938 | 2026-07-01 01:41:59 | MASTER-OAFA | (13h 39m 21.43s , -32d 47m 37.2s) | C | 60 | 19.0 | 11016 | 2026-07-01 01:43:17 | MASTER-OAFA | (13h 39m 25.10s , -32d 46m 17.0s) | C | 60 | 19.0 | 11095 | 2026-07-01 01:44:36 | MASTER-OAFA | (13h 59m 55.70s , -23d 16m 44.9s) | C | 60 | 19.1 | 11155 | 2026-07-01 01:44:36 | MASTER-OAFA | (13h 59m 55.70s , -23d 16m 44.9s) | C | 180 | 19.5 | Coadd 11173 | 2026-07-01 01:45:54 | MASTER-OAFA | (14h 08m 44.02s , -23d 18m 00.3s) | C | 60 | 19.0 | 11248 | 2026-07-01 01:47:09 | MASTER-OAFA | (13h 59m 56.14s , -23d 18m 42.7s) | C | 60 | 18.9 | 11328 | 2026-07-01 01:48:29 | MASTER-OAFA | (14h 00m 01.59s , -23d 18m 36.0s) | C | 60 | 18.7 | 11405 | 2026-07-01 01:49:46 | MASTER-OAFA | (13h 59m 59.10s , -23d 16m 43.4s) | C | 60 | 18.3 | 11481 | 2026-07-01 01:51:01 | MASTER-OAFA | (14h 08m 41.35s , -23d 18m 33.7s) | C | 60 | 19.1 | 11557 | 2026-07-01 01:52:18 | MASTER-OAFA | (14h 00m 02.44s , -23d 16m 56.2s) | C | 60 | 18.9 | 11634 | 2026-07-01 01:53:35 | MASTER-OAFA | (13h 40m 14.42s , -30d 52m 59.4s) | C | 60 | 19.2 | 11711 | 2026-07-01 01:54:52 | MASTER-OAFA | (13h 40m 13.42s , -30d 51m 59.2s) | C | 60 | 18.5 | 11789 | 2026-07-01 01:56:09 | MASTER-OAFA | (13h 40m 19.61s , -30d 52m 59.3s) | C | 60 | 18.5 | 11869 | 2026-07-01 01:57:30 | MASTER-OAFA | (14h 01m 34.40s , -38d 30m 30.0s) | C | 60 | 18.4 | 11947 | 2026-07-01 01:58:48 | MASTER-OAFA | (14h 01m 30.97s , -38d 28m 35.6s) | C | 60 | 18.8 | 12023 | 2026-07-01 02:00:04 | MASTER-OAFA | (14h 01m 31.06s , -38d 30m 30.1s) | C | 60 | 19.0 | 12083 | 2026-07-01 02:00:04 | MASTER-OAFA | (14h 01m 31.06s , -38d 30m 30.1s) | C | 180 | 19.4 | Coadd 12097 | 2026-07-01 02:01:18 | MASTER-OAFA | (13h 51m 20.96s , -38d 28m 15.8s) | C | 60 | 19.1 | 12157 | 2026-07-01 02:01:18 | MASTER-OAFA | (13h 51m 20.96s , -38d 28m 15.8s) | C | 180 | 19.4 | Coadd 12175 | 2026-07-01 02:02:36 | MASTER-OAFA | (13h 51m 16.39s , -38d 29m 13.8s) | C | 60 | 19.1 | 12254 | 2026-07-01 02:03:55 | MASTER-OAFA | (13h 51m 16.50s , -38d 28m 13.3s) | C | 60 | 19.1 | 12332 | 2026-07-01 02:05:13 | MASTER-OAFA | (14h 01m 35.46s , -38d 29m 29.3s) | C | 60 | 19.1 | 12411 | 2026-07-01 02:06:31 | MASTER-OAFA | (14h 01m 29.11s , -38d 30m 28.6s) | C | 60 | 19.1 | 12487 | 2026-07-01 02:07:47 | MASTER-OAFA | (14h 01m 34.26s , -38d 30m 15.1s) | C | 60 | 19.1 | 12565 | 2026-07-01 02:09:05 | MASTER-OAFA | (13h 51m 19.17s , -38d 28m 34.1s) | C | 60 | 19.1 | 12625 | 2026-07-01 02:09:05 | MASTER-OAFA | (13h 51m 19.16s , -38d 28m 34.0s) | C | 180 | 19.4 | Coadd 12643 | 2026-07-01 02:10:23 | MASTER-OAFA | (13h 51m 19.26s , -38d 30m 06.1s) | C | 60 | 19.1 | 12720 | 2026-07-01 02:11:41 | MASTER-OAFA | (13h 51m 22.61s , -38d 28m 15.2s) | C | 60 | 19.1 | 12796 | 2026-07-01 02:12:57 | MASTER-OAFA | (13h 51m 16.98s , -38d 29m 10.7s) | C | 60 | 19.1 | 12873 | 2026-07-01 02:14:14 | MASTER-OAFA | (13h 51m 17.09s , -38d 28m 10.0s) | C | 60 | 19.0 | 12954 | 2026-07-01 02:15:34 | MASTER-OAFA | (14h 26m 33.09s , -19d 31m 23.2s) | C | 60 | 19.4 | 13014 | 2026-07-01 02:15:34 | MASTER-OAFA | (14h 26m 33.08s , -19d 31m 23.2s) | C | 180 | 19.6 | Coadd 13033 | 2026-07-01 02:16:53 | MASTER-OAFA | (14h 35m 09.05s , -19d 31m 09.9s) | C | 60 | 19.2 | 13109 | 2026-07-01 02:18:09 | MASTER-OAFA | (14h 26m 37.10s , -19d 29m 32.6s) | C | 60 | 19.3 | 13289 | 2026-07-01 02:21:10 | MASTER-OAFA | (14h 35m 04.14s , -19d 29m 35.6s) | C | 60 | 19.0 | 13366 | 2026-07-01 02:22:27 | MASTER-OAFA | (14h 26m 39.75s , -19d 30m 17.3s) | C | 60 | 19.1 | 13579 | 2026-07-01 02:25:59 | MASTER-OAFA | (14h 58m 49.12s , -19d 30m 26.3s) | C | 60 | 18.9 | 13639 | 2026-07-01 02:25:59 | MASTER-OAFA | (14h 58m 49.13s , -19d 30m 26.3s) | C | 180 | 19.5 | Coadd 13658 | 2026-07-01 02:27:19 | MASTER-OAFA | (15h 07m 25.10s , -19d 31m 47.1s) | C | 60 | 19.0 | 14356 | 2026-07-01 02:38:57 | MASTER-OAFA | (14h 58m 54.99s , -19d 32m 10.5s) | C | 60 | 19.0 | 14431 | 2026-07-01 02:40:11 | MASTER-OAFA | (15h 07m 27.00s , -19d 31m 12.4s) | C | 60 | 19.0 | 14508 | 2026-07-01 02:41:29 | MASTER-OAFA | (14h 58m 52.88s , -19d 31m 27.7s) | C | 60 | 19.1 | 14661 | 2026-07-01 02:44:02 | MASTER-OAFA | (16h 51m 03.50s , -59d 31m 12.5s) | C | 60 | 18.0 | 14739 | 2026-07-01 02:45:20 | MASTER-OAFA | (17h 06m 44.47s , -59d 32m 36.6s) | C | 60 | 18.1 | 14799 | 2026-07-01 02:45:20 | MASTER-OAFA | (17h 06m 44.46s , -59d 32m 36.6s) | C | 180 | 18.5 | Coadd 14816 | 2026-07-01 02:46:37 | MASTER-OAFA | (17h 06m 44.29s , -59d 31m 36.1s) | C | 60 | 18.1 | 14894 | 2026-07-01 02:47:54 | MASTER-OAFA | (17h 06m 49.03s , -59d 32m 35.6s) | C | 60 | 18.1 | 14972 | 2026-07-01 02:49:13 | MASTER-OAFA | (16h 50m 58.69s , -59d 32m 44.7s) | C | 60 | 18.0 | 15047 | 2026-07-01 02:50:28 | MASTER-OAFA | (16h 51m 03.50s , -59d 32m 19.6s) | C | 60 | 18.0 | 15128 | 2026-07-01 02:51:49 | MASTER-OAFA | (17h 06m 50.12s , -59d 31m 58.9s) | C | 60 | 18.1 | 17948 | 2026-07-01 03:37:49 | MASTER-OAGH | (11h 33m 19.71s , +01d 24m 59.1s) | C | 180 | 17.9 | 17948 | 2026-07-01 03:37:49 | MASTER-OAGH | (11h 31m 57.03s , +01d 57m 36.7s) | C | 180 | 18.5 | 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/45061. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43275] GRB 260701A: Fermi GBM Final Real-time Localization
by GCN Circulars 01 Jul '26

01 Jul '26

TITLE: GCN CIRCULAR NUMBER: 45060 SUBJECT: GRB 260701A: Fermi GBM Final Real-time Localization DATE: 26/07/01 02:27:30 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 02:16:36 UT on 1 Jul 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260701A (trigger 804565001.437744 / 260701095). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 294.2, Dec = -51.3 (J2000 degrees, equivalent to J2000 19h 36m, -51d 17'), with a statistical uncertainty of 6.7 degrees. The angle from the Fermi LAT boresight is 68.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260701095/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260701095/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260701095/… View this GCN Circular online at https://gcn.nasa.gov/circulars/45060. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43274] Fermi GBM trigger 804552016/260630945 is not a GRB
by GCN Circulars 01 Jul '26

01 Jul '26

TITLE: GCN CIRCULAR NUMBER: 45059 SUBJECT: Fermi GBM trigger 804552016/260630945 is not a GRB DATE: 26/07/01 01:26:30 GMT FROM: rhamburg(a)usra.edu R. Hamburg (USRA) reports on behalf of the Fermi Gamma-ray Burst Monitor Team: "The Fermi Gamma-ray Burst Monitor (GBM) trigger 804552016/260630945 at 22:40:11.17 UT on 30 June 2026, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is likely due to statistical fluctuations in opposite-facing detectors." View this GCN Circular online at https://gcn.nasa.gov/circulars/45059. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43273] Fermi-LAT Gamma-ray Observations of IceCube-260622A
by GCN Circulars 30 Jun '26

30 Jun '26

TITLE: GCN CIRCULAR NUMBER: 45058 SUBJECT: Fermi-LAT Gamma-ray Observations of IceCube-260622A DATE: 26/06/30 23:04:48 GMT FROM: Simone Garrappa at Weizmann Institute of Science <simone.garrappa(a)weizmann.ac.il> S. Garrappa (Weizmann Institute of Science), L. Pfeiffer (Univ. of Wuerzburg), S. Buson (DESY, Univ. of Wuerzburg), J. Valverde (Marquette University) and C. Bartolini (University of Trento, INFN Bari) on behalf of the Fermi-LAT collaboration: We report an analysis of observations of the vicinity of the high-energy IC260622A neutrino event (GCN 45018) with all-sky survey data from the Large Area Telescope (LAT), on board the Fermi Gamma-ray Space Telescope. The IceCube event was detected on 2026-06-22 at 15:41:54.81 UTC (T0) with J2000 position RA = 173.36 (+0.5, -0.52) deg, Decl. = 1.34 (+0.58, -0.58) deg, 90% PSF containment. No cataloged >100 MeV gamma-ray sources are located within the 90% IC260622A localization error (4FGL-DR4; The Fourth Fermi-LAT catalog Data Release 4, The Fermi-LAT collaboration 2023, arXiv:2307.12546). In the preliminary list of the upcoming 5FGL catalog (FL16Y, Ballet et al. 2026), we find the gamma-ray source FL16Y 1134.2+0051 within the neutrino 90% PSF containment, at 0.53 deg from the best-fit neutrino position. From a preliminary analysis of Fermi-LAT data integrated on 1 month before T0, the source is significantly detected (> 5 sigma) in gamma-rays. The source is detected with a flux F = (1 +/- 0.3)e-7 ph cm^-2 s^-1 and best-fit power-law index 2.9 +/- 0.2, statistical errors only. A tentative counterpart to FL16Y 1134.2+0051 is the flat-spectrum radio source CRATES J1133+0058 (Healey et al. 2007, ApJS 171 1 61), ~9 arcmin from the Fermi-LAT best-fit localization and within its 68% error. We note that the localization region of IceCube-260622A is very close to the ecliptic; therefore the aforementioned results could be partially contaminated by the emission from the Moon. Time intervals with the Sun in the region of interest have been excluded from the analysis. We searched for the existence of intermediate (days to years) timescale emission from a new gamma-ray transient source. Preliminary analysis indicates no significant (>5sigma) new excess emission (> 100 MeV) within the IC260622A 90% confidence localization. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC260622A best-fit position, the >100 MeV flux upper limit (95% confidence) is < 2.2e-10 ph cm^-2 s^-1 for ~18-years (2008-08-04 / T0), <1.2e-08 (<8.4e-07) ph cm^-2 s^-1 for a 1-month (1-day) integration time before T0. Since Fermi normally operates in an all-sky scanning mode, regular monitoring of this source will continue. For this source the Fermi-LAT contact person is Simone Garrappa (simone.garrappa at weizmann.ac.il). The Fermi LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden. View this GCN Circular online at https://gcn.nasa.gov/circulars/45058. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43272] EP260628a: EP-FXT follow-up observation
by GCN Circulars 30 Jun '26

30 Jun '26

TITLE: GCN CIRCULAR NUMBER: 45057 SUBJECT: EP260628a: EP-FXT follow-up observation DATE: 26/06/30 02:51:19 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> X. Mao (NAO, CAS), C. Y. Dai (NJU), H. N. Yang, C. C. Jin (NAO, CAS) on behalf of the Einstein Probe (EP) team: EP-FXT performed a follow-up observation of EP260628a (X. Mao et al., GCN 45054) starting at 2026-06-29T06:40:57 (UTC), approximately 13.5 hours after the WXT detection. With an exposure time of 1.5 ks, no significant X-ray source was detected within the 2.8 arcmin radius of the EP-WXT position. The derived 0.5-10 keV upper limit is about 3.7 x 10^(-13) erg cm^-2 s^-1. 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/45057. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43271] GRB 260629A: Fermi GBM Final Real-time Localization
by GCN Circulars 29 Jun '26

29 Jun '26

TITLE: GCN CIRCULAR NUMBER: 45056 SUBJECT: GRB 260629A: Fermi GBM Final Real-time Localization DATE: 26/06/29 15:19:19 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 15:06:58 UT on 29 Jun 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260629A (trigger 804438423.955606 / 260629630). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 146.1, Dec = 70.6 (J2000 degrees, equivalent to J2000 09h 44m, 70d 35'), with a statistical uncertainty of 10.5 degrees. The angle from the Fermi LAT boresight is 49.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260629630/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260629630/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260629630/… View this GCN Circular online at https://gcn.nasa.gov/circulars/45056. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43270] Fermi GRB 260628A: Global MASTER-Net observations report
by GCN Circulars 29 Jun '26

29 Jun '26

TITLE: GCN CIRCULAR NUMBER: 45055 SUBJECT: Fermi GRB 260628A: Global MASTER-Net observations report DATE: 26/06/29 03:33:42 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), M. Segura, 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-OAGH robotic telescope [1] located in Mexico (OAGH National Institute for Astrophysics, Optics and Electronics) started inspect of the Fermi GRB 260628A ( Fermi GBM team, GCN 45053) errorbox 19512 sec after notice time and 19564 sec after trigger time at 2026-06-29 03:17:28 UT, with upper limit up to 15.9 mag. Observations started at twilight. The observations began at zenith distance = 81 deg. The sun altitude is -9.9 deg. The galactic latitude b = -26 deg., longitude l = 39 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3405318 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 19595 | 2026-06-29 03:17:28 | MASTER-OAGH | (19h 41m 35.39s , +00d 26m 15.1s) | C | 60 | 14.6 | 19821 | 2026-06-29 03:21:14 | MASTER-OAGH | (19h 41m 18.87s , -01d 27m 54.5s) | C | 60 | 15.0 | 19821 | 2026-06-29 03:21:14 | MASTER-OAGH | (19h 35m 27.78s , -00d 49m 53.7s) | C | 60 | 14.5 | 19901 | 2026-06-29 03:22:35 | MASTER-OAGH | (19h 43m 03.30s , +02d 19m 13.8s) | C | 60 | 15.4 | 20056 | 2026-06-29 03:25:10 | MASTER-OAGH | (19h 47m 54.90s , +02d 57m 54.9s) | C | 60 | 14.9 | 20056 | 2026-06-29 03:25:10 | MASTER-OAGH | (19h 53m 46.15s , +02d 19m 54.0s) | C | 60 | 15.4 | 20137 | 2026-06-29 03:26:30 | MASTER-OAGH | (19h 45m 51.59s , +04d 13m 03.3s) | C | 60 | 15.9 | 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/45055. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43269] EP260628a: EP-WXT detection of a fast X-ray transient
by GCN Circulars 29 Jun '26

29 Jun '26

TITLE: GCN CIRCULAR NUMBER: 45054 SUBJECT: EP260628a: EP-WXT detection of a fast X-ray transient DATE: 26/06/29 03:22:43 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> X. Mao, H. N. Yang (NAO, CAS), C. Y. Dai(NJU), C. C. Jin (NAO, CAS) on behalf of the Einstein Probe (EP) team: We report on the detection of a fast X-ray transient, designated EP260628a, by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission. The transient was identified in the telemetry data. The transient started at 2026-06-28T17:08:08 (UTC) and lasted for about 30s, with a peak flux of ~ 7 x 10^(-9) erg cm^-2 s^-1 in 0.5-4 keV. The position of the transient is R.A. = 312.9884 deg, Dec. = -34.3748 (J2000), with an uncertainty radius of 2.8 arcmin in radius (90% confidence level, including both statistical and systematic uncertainties). There are no known X-ray sources in the WXT error circle. The average WXT 0.5-4 keV spectrum can be fitted by an absorbed power-law model with a fixed Galactic hydrogen column density of 4.86×10^20 cm^-2 and a photon index of 0.67 (-0.52/+0.52). The derived average unabsorbed 0.5-4 keV flux is 1.87 (-0.54/+0.71) x 10^(-9) erg cm^-2 s^-1. The uncertainties are at the 90% confidence level for the above parameters. Follow-up observations by EP-FXT will be arranged. Launched on 2024 January 9, Einstein Probe is a space-based X-ray observatory designed to monitor the dynamic X-ray sky and perform rapid follow-up observations of newly discovered transients (Yuan et al. 2022, Handbook of X-ray and Gamma-ray Astrophysics). View this GCN Circular online at https://gcn.nasa.gov/circulars/45054. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43268] GRB 260628A: Fermi GBM Final Real-time Localization
by GCN Circulars 28 Jun '26

28 Jun '26

TITLE: GCN CIRCULAR NUMBER: 45053 SUBJECT: GRB 260628A: Fermi GBM Final Real-time Localization DATE: 26/06/28 22:03:44 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 21:51:24 UT on 28 Jun 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260628A (trigger 804376289.020238 / 260628911). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 308.2, Dec = -6.9 (J2000 degrees, equivalent to J2000 20h 32m, -6d 54'), with a statistical uncertainty of 14.3 degrees. The angle from the Fermi LAT boresight is 63.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260628911/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260628911/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260628911/… View this GCN Circular online at https://gcn.nasa.gov/circulars/45053. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43267] The EP-WXT trigger 01709272671 is likely a flaring star
by GCN Circulars 28 Jun '26

28 Jun '26

TITLE: GCN CIRCULAR NUMBER: 45052 SUBJECT: The EP-WXT trigger 01709272671 is likely a flaring star DATE: 26/06/28 02:08:13 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> J. P. Chen (SYSU), K. J. Zhang, D. Zhu (YNU), Y. J. Yi (BNU), Z. X. Ling (NAO, CAS) on behalf of the Einstein Probe (EP) team: The EP-WXT trigger 01709272671 at the time of 2026-06-27T17:53:04 (UTC), is likely a stellar flare associated with RX J1942.2-2045. The estimated flux of the flare is around 1.6 x 10^(-10) erg/s/cm^2 in 0.5-4.0 keV, corresponding to an X-ray luminosity of around 4.8 x 10^(30) erg/s. 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/45052. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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