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GCN Circular 36765

Subject
Fermi GRB 240625B: Global MASTER-Net observations report
Date
2024-06-26T04:15:49Z (5 months ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
legacy email
V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik,  D. Vlasenko,
G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij
(Lomonosov Moscow State University, SAI, Physics Department),

R. Podesta, C.Lopez, F. Podesta, C.Francile
(Observatorio Astronomico Felix Aguilar OAFA),

R. Rebolo, M. Serra
(The Instituto de Astrofisica de Canarias),

D. Buckley
(South African Astronomical Observatory),

O.A. Gress, N.M. Budnev, O.Ershova
(Irkutsk State University, API),

L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez
(INAOE, Guillermo Haro Astrophysics Observatory),

A. Tlatov, D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),

V. Yurkov, A. Gabovich
(Blagoveschensk Educational State University)

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 GRB 240625B ( Fermi GBM team, GCN 36763Not found
 
 
) errorbox  17047 sec after notice time and 17076 sec after trigger time at 2024-06-26 03:43:11 UT, with upper limit up to  18.2 mag. The observations began at zenith distance = 80 deg. The sun  altitude  is -23.9 deg. 

The galactic latitude b = -16 deg., longitude l = 218 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2508418

We obtain a following upper limits.  

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

   17107 | 2024-06-26 03:43:11 |         MASTER-SAAO | (05h 23m 38.92s , -19d 41m 29.1s) |   C |    60 | 17.7 |        
   17265 | 2024-06-26 03:45:50 |         MASTER-SAAO | (05h 19m 55.38s , -17d 48m 33.1s) |   C |    60 | 17.8 |        
   17424 | 2024-06-26 03:48:28 |         MASTER-SAAO | (05h 16m 41.27s , -15d 55m 48.2s) |   C |    60 | 17.8 |        
   17582 | 2024-06-26 03:51:07 |         MASTER-SAAO | (05h 13m 53.84s , -14d 01m 37.5s) |   C |    60 | 17.8 |        
   17741 | 2024-06-26 03:53:46 |         MASTER-SAAO | (05h 11m 24.01s , -12d 06m 09.2s) |   C |    60 | 17.7 |        
   17902 | 2024-06-26 03:56:27 |         MASTER-SAAO | (05h 31m 21.76s , -19d 42m 51.8s) |   C |    60 | 17.7 |        
   18060 | 2024-06-26 03:59:05 |         MASTER-SAAO | (05h 23m 43.61s , -19d 41m 39.5s) |   C |    60 | 18.0 |        
   18302 | 2024-06-26 04:03:07 |         MASTER-SAAO | (05h 20m 03.20s , -17d 48m 39.0s) |   C |    60 | 18.2 |        
   18461 | 2024-06-26 04:05:46 |         MASTER-SAAO | (05h 16m 48.76s , -15d 55m 23.6s) |   C |    60 | 18.1 |        
   18620 | 2024-06-26 04:08:25 |         MASTER-SAAO | (05h 13m 54.54s , -14d 01m 43.8s) |   C |    60 | 18.1 |        
Filter C is a clear (unfiltred) band. 


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