Back
GCN Circular 39263

Subject
Fermi GRB 250210A: Global MASTER-Net observations report
Date
2025-02-10T05:46:02Z (a month 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-OAFA robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 250210A ( Fermi GBM team, GCN 39262Loading...
 
 ) errorbox  87 sec after notice time and 123 sec after trigger time at 2025-02-10 05:33:43 UT, with upper limit up to  19.3 mag. The observations began at zenith distance =  6 deg. The sun  altitude  is -43.4 deg. 

The galactic latitude b = 23 deg., longitude l = 262 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2774098

We obtain a following upper limits.  

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

     133 | 2025-02-10 05:33:43 |         MASTER-OAFA | (09h 54m 55.98s , -29d 23m 26.3s) |   C |    20 | 17.7 |        
     133 | 2025-02-10 05:33:43 |         MASTER-OAFA | (10h 05m 22.08s , -28d 58m 37.7s) |   C |    20 | 19.2 |        
     175 | 2025-02-10 05:34:29 |         MASTER-OAFA | (10h 00m 11.61s , -27d 39m 32.1s) |   C |    10 | 17.1 |        
     185 | 2025-02-10 05:34:30 |         MASTER-OAFA | (10h 10m 27.82s , -27d 14m 47.7s) |   C |    30 | 19.3 |        
Filter C is a clear (unfiltred) band. 


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