GCN Circular 40636
Subject
Fermi trigger No 770867684: Global MASTER-Net observations report
Date
2025-06-06T04:16:29Z (2 days ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
email
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-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB250606.08 (trigger No 770867684,11h 54m 36.00s , -54d 01m 12.0s, R=8.02) errorbox 145 sec after notice time and 170 sec after trigger time at 2025-06-06 01:57:29 UT, with upper limit up to 18.0 mag. The observations began at zenith distance = 81 deg. The sun altitude is -44.9 deg.
MASTER-OAFA robotic telescope located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB250606.08 errorbox 146 sec after notice time and 171 sec after trigger time at 2025-06-06 01:57:30 UT, with upper limit up to 19.4 mag. The observations began at zenith distance = 33 deg. The sun altitude is -54.5 deg.
The galactic latitude b = 8 deg., longitude l = 295 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2893923
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
185 | 2025-06-06 01:57:29 | MASTER-SAAO | (12h 05m 40.89s , -53d 37m 11.1s) | C | 30 | 16.5 |
235 | 2025-06-06 01:57:29 | MASTER-SAAO | (12h 05m 40.89s , -53d 37m 11.2s) | C | 130 | 17.2 | Coadd
185 | 2025-06-06 01:57:29 | MASTER-SAAO | (12h 08m 35.38s , -53d 52m 45.4s) | C | 30 | 17.3 |
235 | 2025-06-06 01:57:29 | MASTER-SAAO | (12h 08m 35.39s , -53d 52m 45.4s) | C | 130 | 18.0 | Coadd
187 | 2025-06-06 01:57:30 | MASTER-OAFA | (12h 08m 13.05s , -53d 38m 46.7s) | C | 30 | 18.6 |
228 | 2025-06-06 01:58:06 | MASTER-OAFA | (12h 08m 13.09s , -53d 38m 46.8s) | C | 40 | 18.8 |
239 | 2025-06-06 01:58:18 | MASTER-SAAO | (12h 05m 41.09s , -53d 37m 07.5s) | C | 40 | 16.7 |
239 | 2025-06-06 01:58:18 | MASTER-SAAO | (12h 08m 35.55s , -53d 52m 43.0s) | C | 40 | 17.5 |
279 | 2025-06-06 01:58:53 | MASTER-OAFA | (12h 08m 13.22s , -53d 38m 46.8s) | C | 50 | 19.0 |
308 | 2025-06-06 01:59:17 | MASTER-SAAO | (12h 05m 41.36s , -53d 37m 03.8s) | C | 60 | 16.8 |
308 | 2025-06-06 01:59:17 | MASTER-SAAO | (12h 08m 35.78s , -53d 52m 40.3s) | C | 60 | 17.6 |
341 | 2025-06-06 01:59:49 | MASTER-OAFA | (12h 08m 13.38s , -53d 38m 46.5s) | C | 60 | 18.9 |
387 | 2025-06-06 02:00:36 | MASTER-SAAO | (12h 05m 41.68s , -53d 37m 00.3s) | C | 60 | 16.8 |
387 | 2025-06-06 02:00:36 | MASTER-SAAO | (12h 08m 36.14s , -53d 52m 38.0s) | C | 60 | 17.6 |
419 | 2025-06-06 02:01:08 | MASTER-OAFA | (12h 31m 47.57s , -49d 44m 44.7s) | C | 60 | 19.0 |
754 | 2025-06-06 02:06:43 | MASTER-OAFA | (12h 44m 15.34s , -49d 44m 12.4s) | C | 60 | 19.2 |
932 | 2025-06-06 02:09:40 | MASTER-OAFA | (12h 31m 52.61s , -49d 44m 50.8s) | C | 60 | 19.3 |
1008 | 2025-06-06 02:10:57 | MASTER-OAFA | (12h 38m 34.16s , -51d 38m 58.0s) | C | 60 | 19.1 |
1341 | 2025-06-06 02:16:30 | MASTER-OAFA | (12h 51m 33.85s , -51d 38m 22.8s) | C | 60 | 19.0 |
1417 | 2025-06-06 02:17:46 | MASTER-OAFA | (12h 44m 10.98s , -49d 45m 06.6s) | C | 60 | 19.3 |
1596 | 2025-06-06 02:20:44 | MASTER-OAFA | (12h 31m 50.62s , -49d 43m 18.2s) | C | 60 | 19.1 |
1672 | 2025-06-06 02:22:01 | MASTER-OAFA | (12h 38m 36.25s , -51d 38m 57.0s) | C | 60 | 18.6 |
1999 | 2025-06-06 02:27:28 | MASTER-OAFA | (12h 51m 34.74s , -51d 38m 15.9s) | C | 60 | 19.4 |
2077 | 2025-06-06 02:28:46 | MASTER-OAFA | (12h 44m 12.10s , -49d 45m 00.3s) | C | 60 | 19.3 |
2255 | 2025-06-06 02:31:43 | MASTER-OAFA | (12h 31m 52.06s , -49d 43m 09.8s) | C | 60 | 18.6 |
2331 | 2025-06-06 02:33:00 | MASTER-OAFA | (12h 38m 37.81s , -51d 38m 37.7s) | C | 60 | 18.2 |
2665 | 2025-06-06 02:38:33 | MASTER-OAFA | (12h 51m 36.64s , -51d 38m 08.1s) | C | 60 | 18.5 |
2740 | 2025-06-06 02:39:48 | MASTER-OAFA | (12h 44m 14.95s , -49d 44m 53.5s) | C | 60 | 18.8 |
2916 | 2025-06-06 02:42:45 | MASTER-OAFA | (12h 31m 53.39s , -49d 43m 00.2s) | C | 60 | 18.8 |
2992 | 2025-06-06 02:44:00 | MASTER-OAFA | (12h 38m 39.38s , -51d 38m 29.8s) | C | 60 | 18.7 |
3322 | 2025-06-06 02:49:30 | MASTER-OAFA | (12h 51m 38.28s , -51d 38m 00.7s) | C | 60 | 18.9 |
3398 | 2025-06-06 02:50:46 | MASTER-OAFA | (12h 44m 15.32s , -49d 44m 46.9s) | C | 60 | 19.1 |
3575 | 2025-06-06 02:53:43 | MASTER-OAFA | (12h 31m 54.88s , -49d 42m 52.8s) | C | 60 | 19.1 |
3650 | 2025-06-06 02:54:59 | MASTER-OAFA | (12h 38m 40.97s , -51d 38m 22.6s) | C | 60 | 19.1 |
3985 | 2025-06-06 03:00:34 | MASTER-OAFA | (12h 51m 38.79s , -51d 37m 54.3s) | C | 60 | 18.7 |
4066 | 2025-06-06 03:01:55 | MASTER-OAFA | (12h 44m 18.16s , -49d 44m 41.8s) | C | 60 | 18.6 |
4245 | 2025-06-06 03:04:54 | MASTER-OAFA | (12h 31m 56.32s , -49d 42m 44.8s) | C | 60 | 18.0 |
4323 | 2025-06-06 03:06:12 | MASTER-OAFA | (12h 38m 42.60s , -51d 38m 21.7s) | C | 60 | 17.8 |
4653 | 2025-06-06 03:11:42 | MASTER-OAFA | (12h 51m 41.88s , -51d 37m 49.9s) | C | 60 | 16.9 |
4729 | 2025-06-06 03:12:57 | MASTER-OAFA | (12h 44m 17.92s , -49d 44m 38.6s) | C | 60 | 17.4 |
4915 | 2025-06-06 03:16:04 | MASTER-OAFA | (12h 31m 57.78s , -49d 42m 33.6s) | C | 60 | 17.7 |
4993 | 2025-06-06 03:17:21 | MASTER-OAFA | (12h 38m 44.26s , -51d 38m 29.4s) | C | 60 | 17.7 |
5321 | 2025-06-06 03:22:50 | MASTER-OAFA | (12h 51m 43.99s , -51d 37m 46.6s) | C | 60 | 18.0 |
5398 | 2025-06-06 03:24:07 | MASTER-OAFA | (12h 44m 19.80s , -49d 44m 36.2s) | C | 60 | 17.8 |
5573 | 2025-06-06 03:27:02 | MASTER-OAFA | (12h 31m 59.29s , -49d 42m 59.2s) | C | 60 | 17.6 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.