Back
GCN Circular 39747

Subject
Fermi GRB 250316A: Global MASTER-Net observations report
Date
2025-03-16T19:32:26Z (19 days ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
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-Kislovodsk robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 250316A ( Fermi GBM team, GCN 39741Loading...
 
 ) errorbox  36240 sec after notice time and 36276 sec after trigger time at 2025-03-16 19:04:34 UT, with upper limit up to  17.3 mag. The observations began at zenith distance = 55 deg. The sun  altitude  is -38.8 deg. 

The galactic latitude b = 75 deg., longitude l = 24 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2813565

We obtain a following upper limits.  

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

   36307 | 2025-03-16 19:04:34 |   MASTER-Kislovodsk | (13h 45m 52.80s , +24d 09m 52.7s) |   C |    60 | 16.2 |        
   36387 | 2025-03-16 19:05:54 |   MASTER-Kislovodsk | (13h 54m 40.28s , +24d 10m 54.0s) |   C |    60 | 16.5 |        
   36527 | 2025-03-16 19:08:14 |   MASTER-Kislovodsk | (13h 41m 50.76s , +26d 03m 19.9s) |   C |    60 | 17.3 |        
   36609 | 2025-03-16 19:09:36 |   MASTER-Kislovodsk | (13h 50m 50.40s , +26d 03m 08.2s) |   C |    60 | 17.0 |        
   36689 | 2025-03-16 19:10:56 |   MASTER-Kislovodsk | (13h 58m 47.69s , +26d 02m 55.6s) |   C |    60 | 17.1 |        
   36769 | 2025-03-16 19:12:16 |   MASTER-Kislovodsk | (14h 07m 45.91s , +26d 04m 05.9s) |   C |    60 | 16.8 |        
   36849 | 2025-03-16 19:13:36 |   MASTER-Kislovodsk | (14h 02m 29.99s , +24d 10m 37.1s) |   C |    60 | 16.8 |        
   36928 | 2025-03-16 19:14:55 |   MASTER-Kislovodsk | (14h 11m 21.21s , +24d 09m 17.3s) |   C |    60 | 16.4 |        
   37235 | 2025-03-16 19:20:02 |   MASTER-Kislovodsk | (13h 45m 55.17s , +24d 10m 08.5s) |   C |    60 | 16.9 |        
   37315 | 2025-03-16 19:21:22 |   MASTER-Kislovodsk | (13h 54m 37.47s , +24d 11m 22.2s) |   C |    60 | 16.8 |        
   37394 | 2025-03-16 19:22:41 |   MASTER-Kislovodsk | (13h 41m 51.58s , +26d 04m 40.2s) |   C |    60 | 17.0 |        
   37474 | 2025-03-16 19:24:01 |   MASTER-Kislovodsk | (13h 50m 48.05s , +26d 05m 34.6s) |   C |    60 | 16.9 |        
   37553 | 2025-03-16 19:25:21 |   MASTER-Kislovodsk | (13h 58m 42.08s , +26d 04m 34.8s) |   C |    60 | 16.8 |        
Filter C is a clear (unfiltred) band. 


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