{
  "eventId": "GRB 250407A",
  "body": "V.Lipunov, E.Gorbovskoy, N.Tiurina,  P.Balanutsa, , D.Vlasenko, I.Panchenko,\nA.Kuznetsov,  G.Antipov,  A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin,\nV.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU),\nO.Gress, N.Budnev (ISU),\nC.Francile,  F. Podesta, R.Podesta, E. Gonzalez  (Observatorio Astronomico Felix Aguilar (OAFA),\nA. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),\nA. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity)\nD.Buckley (SAAO),\nR.Rebolo (The Instituto de Astrofisica de Canarias),\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) \n\nMASTER-Tunka robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB 250407A ( Fermi GBM team, GCN 40104) errorbox  27 sec after notice time and 46 sec after trigger time at 2025-04-07 15:49:07 UT, with upper limit up to  17.7 mag. The observations began at zenith distance = 42 deg. The sun  altitude  is -29.6 deg. \n\nMASTER-Kislovodsk robotic telescope  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 250407A errorbox  4363 sec after notice time and 4383 sec after trigger time at 2025-04-07 17:01:24 UT, with upper limit up to  16.1 mag. Observations started at twilight.  The observations began at zenith distance = 19 deg. The sun  altitude  is -14.4 deg. \n\nThe galactic latitude b = 24 deg., longitude l = 176 deg.\n\n\nReal time updated cover map and OT discovered available here: \nhttps://master.sai.msu.ru/site/master2/observ.php?id=2835912\n\nWe obtain a following upper limits.  \n\nTmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n      52 | 2025-04-07 15:49:07 |        MASTER-Tunka | (07h 31m 43.27s , +43d 36m 20.3s) |   C |    10 | 16.5 |        \n     594 | 2025-04-07 15:58:06 |        MASTER-Tunka | (07h 18m 01.14s , +44d 15m 13.8s) |   C |    15 | 16.8 |        \n     609 | 2025-04-07 15:58:06 |        MASTER-Tunka | (07h 18m 01.11s , +44d 15m 13.8s) |   C |    45 | 17.3 |  Coadd \n     612 | 2025-04-07 15:58:25 |        MASTER-Tunka | (07h 18m 01.10s , +44d 15m 13.6s) |   C |    15 | 16.8 |        \n     631 | 2025-04-07 15:58:43 |        MASTER-Tunka | (07h 18m 01.05s , +44d 15m 13.2s) |   C |    15 | 16.9 |        \n     650 | 2025-04-07 15:59:02 |        MASTER-Tunka | (07h 18m 00.98s , +44d 15m 12.7s) |   C |    15 | 16.8 |        \n     665 | 2025-04-07 15:59:02 |        MASTER-Tunka | (07h 18m 00.96s , +44d 15m 12.7s) |   C |    45 | 17.5 |  Coadd \n     668 | 2025-04-07 15:59:21 |        MASTER-Tunka | (07h 18m 00.92s , +44d 15m 12.2s) |   C |    15 | 16.9 |        \n     687 | 2025-04-07 15:59:40 |        MASTER-Tunka | (07h 18m 00.86s , +44d 15m 11.4s) |   C |    15 | 17.1 |        \n     706 | 2025-04-07 15:59:58 |        MASTER-Tunka | (07h 18m 00.82s , +44d 15m 10.8s) |   C |    15 | 17.0 |        \n     721 | 2025-04-07 15:59:58 |        MASTER-Tunka | (07h 18m 00.81s , +44d 15m 10.7s) |   C |    45 | 17.5 |  Coadd \n     724 | 2025-04-07 16:00:17 |        MASTER-Tunka | (07h 18m 00.77s , +44d 15m 10.6s) |   C |    15 | 16.9 |        \n     742 | 2025-04-07 16:00:35 |        MASTER-Tunka | (07h 18m 00.71s , +44d 15m 10.3s) |   C |    15 | 16.9 |        \n     761 | 2025-04-07 16:00:54 |        MASTER-Tunka | (07h 18m 00.68s , +44d 15m 10.0s) |   C |    15 | 17.0 |        \n     776 | 2025-04-07 16:00:54 |        MASTER-Tunka | (07h 18m 00.65s , +44d 15m 09.9s) |   C |    45 | 17.4 |  Coadd \n     779 | 2025-04-07 16:01:12 |        MASTER-Tunka | (07h 18m 00.61s , +44d 15m 09.7s) |   C |    15 | 16.9 |        \n     799 | 2025-04-07 16:01:31 |        MASTER-Tunka | (07h 18m 00.55s , +44d 15m 09.2s) |   C |    15 | 16.6 |        \n     817 | 2025-04-07 16:01:50 |        MASTER-Tunka | (07h 18m 00.46s , +44d 15m 08.1s) |   C |    15 | 16.4 |        \n     832 | 2025-04-07 16:01:50 |        MASTER-Tunka | (07h 18m 00.45s , +44d 15m 08.0s) |   C |    45 | 16.6 |  Coadd \n     835 | 2025-04-07 16:02:08 |        MASTER-Tunka | (07h 18m 00.45s , +44d 15m 07.8s) |   C |    15 | 16.3 |        \n     854 | 2025-04-07 16:02:27 |        MASTER-Tunka | (07h 18m 00.39s , +44d 15m 07.6s) |   C |    15 | 16.2 |        \n     870 | 2025-04-07 16:02:45 |        MASTER-Tunka | (07h 18m 00.33s , +44d 15m 07.3s) |   C |    10 | 15.9 |        \n     880 | 2025-04-07 16:02:45 |        MASTER-Tunka | (07h 18m 00.32s , +44d 15m 07.3s) |   C |    30 | 16.6 |  Coadd \n     883 | 2025-04-07 16:02:58 |        MASTER-Tunka | (07h 18m 00.28s , +44d 15m 07.0s) |   C |    10 | 16.0 |        \n     896 | 2025-04-07 16:03:12 |        MASTER-Tunka | (07h 18m 00.22s , +44d 15m 07.0s) |   C |    10 | 16.2 |        \n     910 | 2025-04-07 16:03:25 |        MASTER-Tunka | (07h 18m 00.20s , +44d 15m 06.6s) |   C |    10 | 16.2 |        \n     920 | 2025-04-07 16:03:25 |        MASTER-Tunka | (07h 18m 00.20s , +44d 15m 06.6s) |   C |    30 | 16.5 |  Coadd \n     924 | 2025-04-07 16:03:39 |        MASTER-Tunka | (07h 18m 00.21s , +44d 15m 07.0s) |   C |    10 | 16.2 |        \n     937 | 2025-04-07 16:03:53 |        MASTER-Tunka | (07h 18m 00.17s , +44d 15m 06.7s) |   C |    10 | 16.2 |        \n     951 | 2025-04-07 16:04:06 |        MASTER-Tunka | (07h 18m 00.16s , +44d 15m 06.5s) |   C |    10 | 16.2 |        \n     961 | 2025-04-07 16:04:06 |        MASTER-Tunka | (07h 18m 00.15s , +44d 15m 06.5s) |   C |    30 | 16.8 |  Coadd \n     964 | 2025-04-07 16:04:20 |        MASTER-Tunka | (07h 18m 00.11s , +44d 15m 06.2s) |   C |    10 | 16.3 |        \n     978 | 2025-04-07 16:04:33 |        MASTER-Tunka | (07h 18m 00.08s , +44d 15m 05.8s) |   C |    10 | 16.4 |        \n     992 | 2025-04-07 16:04:47 |        MASTER-Tunka | (07h 18m 00.06s , +44d 15m 05.5s) |   C |    10 | 16.5 |        \n    1002 | 2025-04-07 16:04:47 |        MASTER-Tunka | (07h 18m 00.06s , +44d 15m 05.4s) |   C |    30 | 16.9 |  Coadd \n    1005 | 2025-04-07 16:05:01 |        MASTER-Tunka | (07h 18m 00.03s , +44d 15m 05.1s) |   C |    10 | 16.5 |        \n    1019 | 2025-04-07 16:05:14 |        MASTER-Tunka | (07h 17m 59.92s , +44d 15m 04.5s) |   C |    10 | 16.3 |        \n    1032 | 2025-04-07 16:05:28 |        MASTER-Tunka | (07h 17m 59.88s , +44d 15m 04.1s) |   C |    10 | 16.2 |        \n    1042 | 2025-04-07 16:05:28 |        MASTER-Tunka | (07h 17m 59.88s , +44d 15m 04.0s) |   C |    30 | 16.6 |  Coadd \n    1046 | 2025-04-07 16:05:42 |        MASTER-Tunka | (07h 17m 59.83s , +44d 15m 03.8s) |   C |    10 | 16.1 |        \n    1060 | 2025-04-07 16:05:56 |        MASTER-Tunka | (07h 17m 59.82s , +44d 15m 03.7s) |   C |    10 | 16.1 |        \n    1074 | 2025-04-07 16:06:09 |        MASTER-Tunka | (07h 17m 59.75s , +44d 15m 03.5s) |   C |    10 | 16.1 |        \n    1084 | 2025-04-07 16:06:09 |        MASTER-Tunka | (07h 17m 59.75s , +44d 15m 03.6s) |   C |    30 | 16.6 |  Coadd \n    1087 | 2025-04-07 16:06:23 |        MASTER-Tunka | (07h 17m 59.74s , +44d 15m 03.4s) |   C |    10 | 16.2 |        \n    1101 | 2025-04-07 16:06:37 |        MASTER-Tunka | (07h 17m 59.68s , +44d 15m 03.0s) |   C |    10 | 16.2 |        \n    1115 | 2025-04-07 16:06:50 |        MASTER-Tunka | (07h 17m 59.64s , +44d 15m 03.1s) |   C |    10 | 16.4 |        \n    1125 | 2025-04-07 16:06:50 |        MASTER-Tunka | (07h 17m 59.64s , +44d 15m 03.1s) |   C |    30 | 17.0 |  Coadd \n    1128 | 2025-04-07 16:07:04 |        MASTER-Tunka | (07h 17m 59.60s , +44d 15m 02.5s) |   C |    10 | 16.5 |        \n    1142 | 2025-04-07 16:07:17 |        MASTER-Tunka | (07h 17m 59.60s , +44d 15m 01.8s) |   C |    10 | 16.7 |        \n    1156 | 2025-04-07 16:07:31 |        MASTER-Tunka | (07h 17m 59.57s , +44d 15m 02.0s) |   C |    10 | 16.7 |        \n    1166 | 2025-04-07 16:07:31 |        MASTER-Tunka | (07h 17m 59.57s , +44d 15m 01.9s) |   C |    30 | 17.3 |  Coadd \n    1169 | 2025-04-07 16:07:45 |        MASTER-Tunka | (07h 17m 59.54s , +44d 15m 02.1s) |   C |    10 | 16.8 |        \n    1183 | 2025-04-07 16:07:58 |        MASTER-Tunka | (07h 17m 59.49s , +44d 15m 01.4s) |   C |    10 | 16.8 |        \n    1199 | 2025-04-07 16:08:12 |        MASTER-Tunka | (07h 17m 59.47s , +44d 15m 01.1s) |   C |    15 | 16.8 |        \n    1214 | 2025-04-07 16:08:12 |        MASTER-Tunka | (07h 17m 59.45s , +44d 15m 01.1s) |   C |    45 | 17.4 |  Coadd \n    1218 | 2025-04-07 16:08:30 |        MASTER-Tunka | (07h 17m 59.40s , +44d 15m 00.9s) |   C |    15 | 16.7 |        \n    1237 | 2025-04-07 16:08:49 |        MASTER-Tunka | (07h 17m 59.37s , +44d 15m 00.1s) |   C |    15 | 16.9 |        \n    1255 | 2025-04-07 16:09:08 |        MASTER-Tunka | (07h 17m 59.35s , +44d 15m 00.0s) |   C |    15 | 17.0 |        \n    1270 | 2025-04-07 16:09:08 |        MASTER-Tunka | (07h 17m 59.35s , +44d 15m 00.1s) |   C |    45 | 17.6 |  Coadd \n    1274 | 2025-04-07 16:09:27 |        MASTER-Tunka | (07h 17m 59.31s , +44d 14m 59.5s) |   C |    15 | 17.2 |        \n    1293 | 2025-04-07 16:09:46 |        MASTER-Tunka | (07h 17m 59.25s , +44d 14m 59.2s) |   C |    15 | 17.2 |        \n    1312 | 2025-04-07 16:10:04 |        MASTER-Tunka | (07h 17m 59.17s , +44d 14m 58.5s) |   C |    15 | 17.0 |        \n    1327 | 2025-04-07 16:10:04 |        MASTER-Tunka | (07h 17m 59.16s , +44d 14m 58.3s) |   C |    45 | 17.5 |  Coadd \n    1330 | 2025-04-07 16:10:22 |        MASTER-Tunka | (07h 17m 59.11s , +44d 14m 58.2s) |   C |    15 | 16.9 |        \n    1349 | 2025-04-07 16:10:41 |        MASTER-Tunka | (07h 17m 59.07s , +44d 14m 58.1s) |   C |    15 | 17.1 |        \n    1367 | 2025-04-07 16:11:00 |        MASTER-Tunka | (07h 17m 59.06s , +44d 14m 57.8s) |   C |    15 | 17.1 |        \n    1382 | 2025-04-07 16:11:00 |        MASTER-Tunka | (07h 17m 59.03s , +44d 14m 57.5s) |   C |    45 | 17.6 |  Coadd \n    1386 | 2025-04-07 16:11:19 |        MASTER-Tunka | (07h 17m 58.96s , +44d 14m 56.9s) |   C |    15 | 17.0 |        \n    1405 | 2025-04-07 16:11:37 |        MASTER-Tunka | (07h 17m 58.88s , +44d 14m 56.5s) |   C |    15 | 16.9 |        \n    1423 | 2025-04-07 16:11:56 |        MASTER-Tunka | (07h 17m 58.84s , +44d 14m 56.1s) |   C |    15 | 17.0 |        \n    1438 | 2025-04-07 16:11:56 |        MASTER-Tunka | (07h 17m 58.82s , +44d 14m 55.9s) |   C |    45 | 17.7 |  Coadd \n    1442 | 2025-04-07 16:12:14 |        MASTER-Tunka | (07h 17m 58.77s , +44d 14m 55.3s) |   C |    15 | 17.1 |        \n    1460 | 2025-04-07 16:12:33 |        MASTER-Tunka | (07h 17m 58.72s , +44d 14m 55.3s) |   C |    15 | 17.0 |        \n    1479 | 2025-04-07 16:12:52 |        MASTER-Tunka | (07h 17m 58.66s , +44d 14m 55.3s) |   C |    15 | 17.1 |        \n    1494 | 2025-04-07 16:12:52 |        MASTER-Tunka | (07h 17m 58.65s , +44d 14m 55.2s) |   C |    45 | 17.6 |  Coadd \n    1498 | 2025-04-07 16:13:10 |        MASTER-Tunka | (07h 17m 58.60s , +44d 14m 54.3s) |   C |    15 | 17.0 |        \n    1516 | 2025-04-07 16:13:29 |        MASTER-Tunka | (07h 17m 58.58s , +44d 14m 54.0s) |   C |    15 | 17.0 |        \n    4413 | 2025-04-07 17:01:24 |   MASTER-Kislovodsk | (07h 15m 35.87s , +39d 19m 33.6s) |   C |    60 | 16.1 |        \n    5084 | 2025-04-07 17:12:35 |   MASTER-Kislovodsk | (07h 15m 35.05s , +39d 18m 41.9s) |   C |    60 | 15.1 |        \n   18929 | 2025-04-07 21:03:19 |   MASTER-Kislovodsk | (07h 24m 40.96s , +39d 08m 54.1s) |   C |    60 | 16.1 |        \n   18925 | 2025-04-07 21:03:31 |        MASTER-Tunka | (07h 21m 45.98s , +43d 01m 33.5s) |   C |    30 | 16.1 |        \n   18955 | 2025-04-07 21:03:31 |        MASTER-Tunka | (07h 21m 45.98s , +43d 01m 33.5s) |   C |    90 | 16.8 |  Coadd \n   18968 | 2025-04-07 21:04:14 |        MASTER-Tunka | (07h 21m 45.94s , +43d 02m 33.2s) |   C |    30 | 16.2 |        \n   19010 | 2025-04-07 21:04:56 |        MASTER-Tunka | (07h 21m 51.95s , +43d 01m 32.7s) |   C |    30 | 16.4 |        \n   19054 | 2025-04-07 21:05:40 |        MASTER-Tunka | (07h 21m 47.61s , +43d 00m 31.0s) |   C |    30 | 16.5 |        \n   19096 | 2025-04-07 21:06:22 |        MASTER-Tunka | (07h 21m 53.31s , +43d 00m 50.5s) |   C |    30 | 16.6 |        \n   19139 | 2025-04-07 21:07:05 |        MASTER-Tunka | (07h 21m 49.60s , +43d 02m 03.7s) |   C |    30 | 16.6 |        \n   19178 | 2025-04-07 21:07:29 |   MASTER-Kislovodsk | (07h 27m 46.98s , +41d 04m 05.2s) |   C |    60 | 15.7 |        \n   19183 | 2025-04-07 21:07:48 |        MASTER-Tunka | (07h 21m 49.75s , +43d 00m 42.4s) |   C |    30 | 16.7 |        \n   19213 | 2025-04-07 21:07:48 |        MASTER-Tunka | (07h 21m 49.74s , +43d 00m 41.9s) |   C |    90 | 17.4 |  Coadd \n   19226 | 2025-04-07 21:08:32 |        MASTER-Tunka | (07h 21m 52.80s , +43d 02m 00.8s) |   C |    30 | 16.8 |        \n   19268 | 2025-04-07 21:09:14 |        MASTER-Tunka | (07h 21m 47.32s , +43d 01m 19.8s) |   C |    30 | 16.8 |        \n   19311 | 2025-04-07 21:09:57 |        MASTER-Tunka | (07h 21m 46.61s , +43d 02m 19.8s) |   C |    30 | 16.7 |        \n   19341 | 2025-04-07 21:09:57 |        MASTER-Tunka | (07h 21m 46.59s , +43d 02m 18.6s) |   C |    90 | 17.3 |  Coadd \n   19344 | 2025-04-07 21:10:15 |   MASTER-Kislovodsk | (07h 20m 26.44s , +42d 57m 56.8s) |   C |    60 | 15.8 |        \n   19354 | 2025-04-07 21:10:39 |        MASTER-Tunka | (07h 21m 52.13s , +43d 01m 19.1s) |   C |    30 | 16.7 |        \n   19398 | 2025-04-07 21:11:23 |        MASTER-Tunka | (07h 21m 46.69s , +43d 00m 15.8s) |   C |    30 | 16.6 |        \n   19442 | 2025-04-07 21:12:07 |        MASTER-Tunka | (07h 28m 37.53s , +42d 02m 35.3s) |   C |    30 | 16.3 |        \n   19484 | 2025-04-07 21:12:50 |        MASTER-Tunka | (07h 28m 33.74s , +42d 03m 44.2s) |   C |    30 | 16.3 |        \n   19527 | 2025-04-07 21:13:32 |        MASTER-Tunka | (07h 28m 33.85s , +42d 02m 30.1s) |   C |    30 | 16.3 |        \n   19571 | 2025-04-07 21:14:17 |        MASTER-Tunka | (07h 28m 36.60s , +42d 03m 41.2s) |   C |    30 | 16.2 |        \n   19615 | 2025-04-07 21:15:00 |        MASTER-Tunka | (07h 28m 30.97s , +42d 02m 58.7s) |   C |    30 | 16.1 |        \n   19659 | 2025-04-07 21:15:45 |        MASTER-Tunka | (07h 28m 30.38s , +42d 03m 55.9s) |   C |    30 | 16.1 |        \n   19704 | 2025-04-07 21:16:30 |        MASTER-Tunka | (07h 21m 53.18s , +43d 00m 59.4s) |   C |    30 | 16.2 |        \n   19743 | 2025-04-07 21:17:13 |        MASTER-Tunka | (07h 21m 48.54s , +42d 59m 58.8s) |   C |    20 | 16.1 |        \n   19774 | 2025-04-07 21:17:45 |        MASTER-Tunka | (07h 21m 52.74s , +43d 00m 00.0s) |   C |    20 | 16.1 |        \n   19809 | 2025-04-07 21:18:20 |        MASTER-Tunka | (07h 21m 50.55s , +43d 01m 39.6s) |   C |    20 | 16.2 |        \n   19842 | 2025-04-07 21:18:52 |        MASTER-Tunka | (07h 21m 50.60s , +43d 00m 24.5s) |   C |    20 | 16.0 |        \n   19875 | 2025-04-07 21:19:25 |        MASTER-Tunka | (07h 21m 54.02s , +43d 01m 40.6s) |   C |    20 | 15.9 |        \n   19907 | 2025-04-07 21:20:00 |        MASTER-Tunka | (07h 21m 47.61s , +43d 00m 52.3s) |   C |    15 | 15.8 |        \n   19935 | 2025-04-07 21:20:27 |        MASTER-Tunka | (07h 21m 47.97s , +43d 01m 51.2s) |   C |    15 | 15.6 |        \n   19964 | 2025-04-07 21:20:57 |        MASTER-Tunka | (07h 21m 53.90s , +43d 00m 50.1s) |   C |    15 | 15.6 |        \n   19988 | 2025-04-07 21:21:24 |        MASTER-Tunka | (07h 21m 47.26s , +42d 59m 49.2s) |   C |    10 | 15.6 |        \nFilter C is a clear (unfiltred) band. \n\n\nThe observation and reduction will continue. \nThe message may be cited.\n",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
  "subject": "Fermi GRB 250407A: Global MASTER-Net observations report",
  "createdOn": 1744065073986,
  "circularId": 40112,
  "bibcode": "2025GCN.40112....1L",
  "submittedHow": "email"
}