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GCN Circular 39328

Subject
Fermi GRB 250215A: Global MASTER-Net observations report
Date
2025-02-15T03:17:00Z (8 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-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 250215A ( Fermi GBM team, GCN 39327Loading...
 
 ) errorbox  553 sec after notice time and 587 sec after trigger time at 2025-02-15 02:41:42 UT, with upper limit up to  18.7 mag. The observations began at zenith distance = 40 deg. The sun  altitude  is -19.3 deg. 

The galactic latitude b = 20 deg., longitude l = 273 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2779054

We obtain a following upper limits.  

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

     617 | 2025-02-15 02:41:42 |         MASTER-SAAO | (10h 29m 47.15s , -34d 28m 22.2s) |   C |    60 | 18.3 |        
     677 | 2025-02-15 02:41:42 |         MASTER-SAAO | (10h 29m 47.15s , -34d 28m 22.1s) |   C |   180 | 18.7 |  Coadd 
     697 | 2025-02-15 02:43:01 |         MASTER-SAAO | (10h 29m 47.06s , -34d 28m 20.0s) |   C |    60 | 18.2 |        
     776 | 2025-02-15 02:44:20 |         MASTER-SAAO | (10h 29m 46.95s , -34d 28m 17.6s) |   C |    60 | 18.2 |        
     855 | 2025-02-15 02:45:39 |         MASTER-SAAO | (10h 29m 46.86s , -34d 28m 15.1s) |   C |    60 | 18.1 |        
Filter C is a clear (unfiltred) band. 


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