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GCN Circular 38917

Subject
Fermi trigger No 758442826: Global MASTER-Net observations report
Date
2025-01-13T07:16:53Z (20 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-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 GRB250113.27 (trigger No 758442826,07h 04m 33.60s , -27d 46m 12.0s, R=6.15) errorbox  86 sec after notice time and 112 sec after trigger time at 2025-01-13 06:35:33 UT, with upper limit up to  19.0 mag. The observations began at zenith distance = 28 deg. The sun  altitude  is -31.0 deg. 

The galactic latitude b = -9 deg., longitude l = 240 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2741637

We obtain a following upper limits.  

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

     122 | 2025-01-13 06:35:33 |         MASTER-OAFA | (07h 22m 47.71s , -30d 20m 23.7s) |   C |    20 | 17.1 |        
     123 | 2025-01-13 06:35:34 |         MASTER-OAFA | (07h 12m 10.44s , -30d 42m 28.8s) |   C |    20 | 18.5 |        
     157 | 2025-01-13 06:36:13 |         MASTER-OAFA | (07h 22m 47.78s , -30d 20m 22.3s) |   C |    10 | 16.8 |        
     167 | 2025-01-13 06:36:13 |         MASTER-OAFA | (07h 12m 10.49s , -30d 42m 28.2s) |   C |    30 | 18.7 |        
     198 | 2025-01-13 06:36:49 |         MASTER-OAFA | (07h 22m 47.77s , -30d 20m 21.5s) |   C |    20 | 17.1 |        
     208 | 2025-01-13 06:36:49 |         MASTER-OAFA | (07h 12m 10.51s , -30d 42m 27.8s) |   C |    40 | 18.8 |        
     248 | 2025-01-13 06:37:35 |         MASTER-OAFA | (07h 22m 47.82s , -30d 20m 20.3s) |   C |    30 | 17.3 |        
     259 | 2025-01-13 06:37:35 |         MASTER-OAFA | (07h 12m 10.55s , -30d 42m 27.3s) |   C |    50 | 18.9 |        
     309 | 2025-01-13 06:38:30 |         MASTER-OAFA | (07h 22m 47.86s , -30d 20m 19.2s) |   C |    40 | 17.4 |        
     319 | 2025-01-13 06:38:31 |         MASTER-OAFA | (07h 12m 10.60s , -30d 42m 26.6s) |   C |    60 | 19.0 |        
     381 | 2025-01-13 06:39:37 |         MASTER-OAFA | (07h 22m 47.91s , -30d 20m 18.3s) |   C |    50 | 17.5 |        
     391 | 2025-01-13 06:39:37 |         MASTER-OAFA | (07h 12m 10.66s , -30d 42m 26.1s) |   C |    70 | 19.0 |        
Filter C is a clear (unfiltred) band. 


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