[vsnet-grb-info 38136] Fermi GRB 250407A: Global MASTER-Net observations report

TITLE: GCN CIRCULAR NUMBER: 40112 SUBJECT: Fermi GRB 250407A: Global MASTER-Net observations report DATE: 25/04/07 22:31:13 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs lipunov@xray.sai.msu.ru

V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko, A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, 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. 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-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.

MASTER-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.

The galactic latitude b = 24 deg., longitude l = 176 deg.

Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2835912

We obtain a following upper limits.

Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________

52 | 2025-04-07 15:49:07 | MASTER-Tunka | (07h 31m 43.27s , +43d 36m 20.3s) | C | 10 | 16.5 | 594 | 2025-04-07 15:58:06 | MASTER-Tunka | (07h 18m 01.14s , +44d 15m 13.8s) | C | 15 | 16.8 | 609 | 2025-04-07 15:58:06 | MASTER-Tunka | (07h 18m 01.11s , +44d 15m 13.8s) | C | 45 | 17.3 | Coadd 612 | 2025-04-07 15:58:25 | MASTER-Tunka | (07h 18m 01.10s , +44d 15m 13.6s) | C | 15 | 16.8 | 631 | 2025-04-07 15:58:43 | MASTER-Tunka | (07h 18m 01.05s , +44d 15m 13.2s) | C | 15 | 16.9 | 650 | 2025-04-07 15:59:02 | MASTER-Tunka | (07h 18m 00.98s , +44d 15m 12.7s) | C | 15 | 16.8 | 665 | 2025-04-07 15:59:02 | MASTER-Tunka | (07h 18m 00.96s , +44d 15m 12.7s) | C | 45 | 17.5 | Coadd 668 | 2025-04-07 15:59:21 | MASTER-Tunka | (07h 18m 00.92s , +44d 15m 12.2s) | C | 15 | 16.9 | 687 | 2025-04-07 15:59:40 | MASTER-Tunka | (07h 18m 00.86s , +44d 15m 11.4s) | C | 15 | 17.1 | 706 | 2025-04-07 15:59:58 | MASTER-Tunka | (07h 18m 00.82s , +44d 15m 10.8s) | C | 15 | 17.0 | 721 | 2025-04-07 15:59:58 | MASTER-Tunka | (07h 18m 00.81s , +44d 15m 10.7s) | C | 45 | 17.5 | Coadd 724 | 2025-04-07 16:00:17 | MASTER-Tunka | (07h 18m 00.77s , +44d 15m 10.6s) | C | 15 | 16.9 | 742 | 2025-04-07 16:00:35 | MASTER-Tunka | (07h 18m 00.71s , +44d 15m 10.3s) | C | 15 | 16.9 | 761 | 2025-04-07 16:00:54 | MASTER-Tunka | (07h 18m 00.68s , +44d 15m 10.0s) | C | 15 | 17.0 | 776 | 2025-04-07 16:00:54 | MASTER-Tunka | (07h 18m 00.65s , +44d 15m 09.9s) | C | 45 | 17.4 | Coadd 779 | 2025-04-07 16:01:12 | MASTER-Tunka | (07h 18m 00.61s , +44d 15m 09.7s) | C | 15 | 16.9 | 799 | 2025-04-07 16:01:31 | MASTER-Tunka | (07h 18m 00.55s , +44d 15m 09.2s) | C | 15 | 16.6 | 817 | 2025-04-07 16:01:50 | MASTER-Tunka | (07h 18m 00.46s , +44d 15m 08.1s) | C | 15 | 16.4 | 832 | 2025-04-07 16:01:50 | MASTER-Tunka | (07h 18m 00.45s , +44d 15m 08.0s) | C | 45 | 16.6 | Coadd 835 | 2025-04-07 16:02:08 | MASTER-Tunka | (07h 18m 00.45s , +44d 15m 07.8s) | C | 15 | 16.3 | 854 | 2025-04-07 16:02:27 | MASTER-Tunka | (07h 18m 00.39s , +44d 15m 07.6s) | C | 15 | 16.2 | 870 | 2025-04-07 16:02:45 | MASTER-Tunka | (07h 18m 00.33s , +44d 15m 07.3s) | C | 10 | 15.9 | 880 | 2025-04-07 16:02:45 | MASTER-Tunka | (07h 18m 00.32s , +44d 15m 07.3s) | C | 30 | 16.6 | Coadd 883 | 2025-04-07 16:02:58 | MASTER-Tunka | (07h 18m 00.28s , +44d 15m 07.0s) | C | 10 | 16.0 | 896 | 2025-04-07 16:03:12 | MASTER-Tunka | (07h 18m 00.22s , +44d 15m 07.0s) | C | 10 | 16.2 | 910 | 2025-04-07 16:03:25 | MASTER-Tunka | (07h 18m 00.20s , +44d 15m 06.6s) | C | 10 | 16.2 | 920 | 2025-04-07 16:03:25 | MASTER-Tunka | (07h 18m 00.20s , +44d 15m 06.6s) | C | 30 | 16.5 | Coadd 924 | 2025-04-07 16:03:39 | MASTER-Tunka | (07h 18m 00.21s , +44d 15m 07.0s) | C | 10 | 16.2 | 937 | 2025-04-07 16:03:53 | MASTER-Tunka | (07h 18m 00.17s , +44d 15m 06.7s) | C | 10 | 16.2 | 951 | 2025-04-07 16:04:06 | MASTER-Tunka | (07h 18m 00.16s , +44d 15m 06.5s) | C | 10 | 16.2 | 961 | 2025-04-07 16:04:06 | MASTER-Tunka | (07h 18m 00.15s , +44d 15m 06.5s) | C | 30 | 16.8 | Coadd 964 | 2025-04-07 16:04:20 | MASTER-Tunka | (07h 18m 00.11s , +44d 15m 06.2s) | C | 10 | 16.3 | 978 | 2025-04-07 16:04:33 | MASTER-Tunka | (07h 18m 00.08s , +44d 15m 05.8s) | C | 10 | 16.4 | 992 | 2025-04-07 16:04:47 | MASTER-Tunka | (07h 18m 00.06s , +44d 15m 05.5s) | C | 10 | 16.5 | 1002 | 2025-04-07 16:04:47 | MASTER-Tunka | (07h 18m 00.06s , +44d 15m 05.4s) | C | 30 | 16.9 | Coadd 1005 | 2025-04-07 16:05:01 | MASTER-Tunka | (07h 18m 00.03s , +44d 15m 05.1s) | C | 10 | 16.5 | 1019 | 2025-04-07 16:05:14 | MASTER-Tunka | (07h 17m 59.92s , +44d 15m 04.5s) | C | 10 | 16.3 | 1032 | 2025-04-07 16:05:28 | MASTER-Tunka | (07h 17m 59.88s , +44d 15m 04.1s) | C | 10 | 16.2 | 1042 | 2025-04-07 16:05:28 | MASTER-Tunka | (07h 17m 59.88s , +44d 15m 04.0s) | C | 30 | 16.6 | Coadd 1046 | 2025-04-07 16:05:42 | MASTER-Tunka | (07h 17m 59.83s , +44d 15m 03.8s) | C | 10 | 16.1 | 1060 | 2025-04-07 16:05:56 | MASTER-Tunka | (07h 17m 59.82s , +44d 15m 03.7s) | C | 10 | 16.1 | 1074 | 2025-04-07 16:06:09 | MASTER-Tunka | (07h 17m 59.75s , +44d 15m 03.5s) | C | 10 | 16.1 | 1084 | 2025-04-07 16:06:09 | MASTER-Tunka | (07h 17m 59.75s , +44d 15m 03.6s) | C | 30 | 16.6 | Coadd 1087 | 2025-04-07 16:06:23 | MASTER-Tunka | (07h 17m 59.74s , +44d 15m 03.4s) | C | 10 | 16.2 | 1101 | 2025-04-07 16:06:37 | MASTER-Tunka | (07h 17m 59.68s , +44d 15m 03.0s) | C | 10 | 16.2 | 1115 | 2025-04-07 16:06:50 | MASTER-Tunka | (07h 17m 59.64s , +44d 15m 03.1s) | C | 10 | 16.4 | 1125 | 2025-04-07 16:06:50 | MASTER-Tunka | (07h 17m 59.64s , +44d 15m 03.1s) | C | 30 | 17.0 | Coadd 1128 | 2025-04-07 16:07:04 | MASTER-Tunka | (07h 17m 59.60s , +44d 15m 02.5s) | C | 10 | 16.5 | 1142 | 2025-04-07 16:07:17 | MASTER-Tunka | (07h 17m 59.60s , +44d 15m 01.8s) | C | 10 | 16.7 | 1156 | 2025-04-07 16:07:31 | MASTER-Tunka | (07h 17m 59.57s , +44d 15m 02.0s) | C | 10 | 16.7 | 1166 | 2025-04-07 16:07:31 | MASTER-Tunka | (07h 17m 59.57s , +44d 15m 01.9s) | C | 30 | 17.3 | Coadd 1169 | 2025-04-07 16:07:45 | MASTER-Tunka | (07h 17m 59.54s , +44d 15m 02.1s) | C | 10 | 16.8 | 1183 | 2025-04-07 16:07:58 | MASTER-Tunka | (07h 17m 59.49s , +44d 15m 01.4s) | C | 10 | 16.8 | 1199 | 2025-04-07 16:08:12 | MASTER-Tunka | (07h 17m 59.47s , +44d 15m 01.1s) | C | 15 | 16.8 | 1214 | 2025-04-07 16:08:12 | MASTER-Tunka | (07h 17m 59.45s , +44d 15m 01.1s) | C | 45 | 17.4 | Coadd 1218 | 2025-04-07 16:08:30 | MASTER-Tunka | (07h 17m 59.40s , +44d 15m 00.9s) | C | 15 | 16.7 | 1237 | 2025-04-07 16:08:49 | MASTER-Tunka | (07h 17m 59.37s , +44d 15m 00.1s) | C | 15 | 16.9 | 1255 | 2025-04-07 16:09:08 | MASTER-Tunka | (07h 17m 59.35s , +44d 15m 00.0s) | C | 15 | 17.0 | 1270 | 2025-04-07 16:09:08 | MASTER-Tunka | (07h 17m 59.35s , +44d 15m 00.1s) | C | 45 | 17.6 | Coadd 1274 | 2025-04-07 16:09:27 | MASTER-Tunka | (07h 17m 59.31s , +44d 14m 59.5s) | C | 15 | 17.2 | 1293 | 2025-04-07 16:09:46 | MASTER-Tunka | (07h 17m 59.25s , +44d 14m 59.2s) | C | 15 | 17.2 | 1312 | 2025-04-07 16:10:04 | MASTER-Tunka | (07h 17m 59.17s , +44d 14m 58.5s) | C | 15 | 17.0 | 1327 | 2025-04-07 16:10:04 | MASTER-Tunka | (07h 17m 59.16s , +44d 14m 58.3s) | C | 45 | 17.5 | Coadd 1330 | 2025-04-07 16:10:22 | MASTER-Tunka | (07h 17m 59.11s , +44d 14m 58.2s) | C | 15 | 16.9 | 1349 | 2025-04-07 16:10:41 | MASTER-Tunka | (07h 17m 59.07s , +44d 14m 58.1s) | C | 15 | 17.1 | 1367 | 2025-04-07 16:11:00 | MASTER-Tunka | (07h 17m 59.06s , +44d 14m 57.8s) | C | 15 | 17.1 | 1382 | 2025-04-07 16:11:00 | MASTER-Tunka | (07h 17m 59.03s , +44d 14m 57.5s) | C | 45 | 17.6 | Coadd 1386 | 2025-04-07 16:11:19 | MASTER-Tunka | (07h 17m 58.96s , +44d 14m 56.9s) | C | 15 | 17.0 | 1405 | 2025-04-07 16:11:37 | MASTER-Tunka | (07h 17m 58.88s , +44d 14m 56.5s) | C | 15 | 16.9 | 1423 | 2025-04-07 16:11:56 | MASTER-Tunka | (07h 17m 58.84s , +44d 14m 56.1s) | C | 15 | 17.0 | 1438 | 2025-04-07 16:11:56 | MASTER-Tunka | (07h 17m 58.82s , +44d 14m 55.9s) | C | 45 | 17.7 | Coadd 1442 | 2025-04-07 16:12:14 | MASTER-Tunka | (07h 17m 58.77s , +44d 14m 55.3s) | C | 15 | 17.1 | 1460 | 2025-04-07 16:12:33 | MASTER-Tunka | (07h 17m 58.72s , +44d 14m 55.3s) | C | 15 | 17.0 | 1479 | 2025-04-07 16:12:52 | MASTER-Tunka | (07h 17m 58.66s , +44d 14m 55.3s) | C | 15 | 17.1 | 1494 | 2025-04-07 16:12:52 | MASTER-Tunka | (07h 17m 58.65s , +44d 14m 55.2s) | C | 45 | 17.6 | Coadd 1498 | 2025-04-07 16:13:10 | MASTER-Tunka | (07h 17m 58.60s , +44d 14m 54.3s) | C | 15 | 17.0 | 1516 | 2025-04-07 16:13:29 | MASTER-Tunka | (07h 17m 58.58s , +44d 14m 54.0s) | C | 15 | 17.0 | 4413 | 2025-04-07 17:01:24 | MASTER-Kislovodsk | (07h 15m 35.87s , +39d 19m 33.6s) | C | 60 | 16.1 | 5084 | 2025-04-07 17:12:35 | MASTER-Kislovodsk | (07h 15m 35.05s , +39d 18m 41.9s) | C | 60 | 15.1 | 18929 | 2025-04-07 21:03:19 | MASTER-Kislovodsk | (07h 24m 40.96s , +39d 08m 54.1s) | C | 60 | 16.1 | 18925 | 2025-04-07 21:03:31 | MASTER-Tunka | (07h 21m 45.98s , +43d 01m 33.5s) | C | 30 | 16.1 | 18955 | 2025-04-07 21:03:31 | MASTER-Tunka | (07h 21m 45.98s , +43d 01m 33.5s) | C | 90 | 16.8 | Coadd 18968 | 2025-04-07 21:04:14 | MASTER-Tunka | (07h 21m 45.94s , +43d 02m 33.2s) | C | 30 | 16.2 | 19010 | 2025-04-07 21:04:56 | MASTER-Tunka | (07h 21m 51.95s , +43d 01m 32.7s) | C | 30 | 16.4 | 19054 | 2025-04-07 21:05:40 | MASTER-Tunka | (07h 21m 47.61s , +43d 00m 31.0s) | C | 30 | 16.5 | 19096 | 2025-04-07 21:06:22 | MASTER-Tunka | (07h 21m 53.31s , +43d 00m 50.5s) | C | 30 | 16.6 | 19139 | 2025-04-07 21:07:05 | MASTER-Tunka | (07h 21m 49.60s , +43d 02m 03.7s) | C | 30 | 16.6 | 19178 | 2025-04-07 21:07:29 | MASTER-Kislovodsk | (07h 27m 46.98s , +41d 04m 05.2s) | C | 60 | 15.7 | 19183 | 2025-04-07 21:07:48 | MASTER-Tunka | (07h 21m 49.75s , +43d 00m 42.4s) | C | 30 | 16.7 | 19213 | 2025-04-07 21:07:48 | MASTER-Tunka | (07h 21m 49.74s , +43d 00m 41.9s) | C | 90 | 17.4 | Coadd 19226 | 2025-04-07 21:08:32 | MASTER-Tunka | (07h 21m 52.80s , +43d 02m 00.8s) | C | 30 | 16.8 | 19268 | 2025-04-07 21:09:14 | MASTER-Tunka | (07h 21m 47.32s , +43d 01m 19.8s) | C | 30 | 16.8 | 19311 | 2025-04-07 21:09:57 | MASTER-Tunka | (07h 21m 46.61s , +43d 02m 19.8s) | C | 30 | 16.7 | 19341 | 2025-04-07 21:09:57 | MASTER-Tunka | (07h 21m 46.59s , +43d 02m 18.6s) | C | 90 | 17.3 | Coadd 19344 | 2025-04-07 21:10:15 | MASTER-Kislovodsk | (07h 20m 26.44s , +42d 57m 56.8s) | C | 60 | 15.8 | 19354 | 2025-04-07 21:10:39 | MASTER-Tunka | (07h 21m 52.13s , +43d 01m 19.1s) | C | 30 | 16.7 | 19398 | 2025-04-07 21:11:23 | MASTER-Tunka | (07h 21m 46.69s , +43d 00m 15.8s) | C | 30 | 16.6 | 19442 | 2025-04-07 21:12:07 | MASTER-Tunka | (07h 28m 37.53s , +42d 02m 35.3s) | C | 30 | 16.3 | 19484 | 2025-04-07 21:12:50 | MASTER-Tunka | (07h 28m 33.74s , +42d 03m 44.2s) | C | 30 | 16.3 | 19527 | 2025-04-07 21:13:32 | MASTER-Tunka | (07h 28m 33.85s , +42d 02m 30.1s) | C | 30 | 16.3 | 19571 | 2025-04-07 21:14:17 | MASTER-Tunka | (07h 28m 36.60s , +42d 03m 41.2s) | C | 30 | 16.2 | 19615 | 2025-04-07 21:15:00 | MASTER-Tunka | (07h 28m 30.97s , +42d 02m 58.7s) | C | 30 | 16.1 | 19659 | 2025-04-07 21:15:45 | MASTER-Tunka | (07h 28m 30.38s , +42d 03m 55.9s) | C | 30 | 16.1 | 19704 | 2025-04-07 21:16:30 | MASTER-Tunka | (07h 21m 53.18s , +43d 00m 59.4s) | C | 30 | 16.2 | 19743 | 2025-04-07 21:17:13 | MASTER-Tunka | (07h 21m 48.54s , +42d 59m 58.8s) | C | 20 | 16.1 | 19774 | 2025-04-07 21:17:45 | MASTER-Tunka | (07h 21m 52.74s , +43d 00m 00.0s) | C | 20 | 16.1 | 19809 | 2025-04-07 21:18:20 | MASTER-Tunka | (07h 21m 50.55s , +43d 01m 39.6s) | C | 20 | 16.2 | 19842 | 2025-04-07 21:18:52 | MASTER-Tunka | (07h 21m 50.60s , +43d 00m 24.5s) | C | 20 | 16.0 | 19875 | 2025-04-07 21:19:25 | MASTER-Tunka | (07h 21m 54.02s , +43d 01m 40.6s) | C | 20 | 15.9 | 19907 | 2025-04-07 21:20:00 | MASTER-Tunka | (07h 21m 47.61s , +43d 00m 52.3s) | C | 15 | 15.8 | 19935 | 2025-04-07 21:20:27 | MASTER-Tunka | (07h 21m 47.97s , +43d 01m 51.2s) | C | 15 | 15.6 | 19964 | 2025-04-07 21:20:57 | MASTER-Tunka | (07h 21m 53.90s , +43d 00m 50.1s) | C | 15 | 15.6 | 19988 | 2025-04-07 21:21:24 | MASTER-Tunka | (07h 21m 47.26s , +42d 59m 49.2s) | C | 10 | 15.6 | Filter C is a clear (unfiltred) band.

The observation and reduction will continue. The message may be cited.

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