GCN Circular 43627

Subject

Fermi trigger No 792135758: Global MASTER-Net observations report

Event

GRB 260207A

Date

2026-02-07T06:16:25Z (3 days ago)

Edited On

2026-02-09T14:27:14Z (a day ago)

From

Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>

Edited By

Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Vladimir Lipunov at Lomonosov Moscow State University <lipunov@sai.msu.ru>

Via

V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko, 
G.Antipov,  A.Sankovich, Yu.Tselik, 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.Sosnovskij (CrAO),
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  [1]  located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB260207.24 (trigger No 792135758,10h 41m 48.00s , -34d 26m 24.0s, R=3.29) errorbox  110 sec after notice time and 142 sec after trigger time at 2026-02-07 05:44:56 UT, with upper limit up to  20.7 mag. The observations began at zenith distance =  7 deg. The sun  altitude  is -41.7 deg. 

The galactic latitude b = 21 deg., longitude l = 275 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3124959

We obtain a following upper limits.  

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

     158 | 2026-02-07 05:44:56 |         MASTER-OAFA | (10h 51m 33.24s , -33d 38m 46.3s) |   C |    30 | 19.5 |        
     203 | 2026-02-07 05:44:56 |         MASTER-OAFA | (10h 51m 33.24s , -33d 38m 46.4s) |   C |   120 | 20.0 |  Coadd 
     198 | 2026-02-07 05:45:32 |         MASTER-OAFA | (10h 51m 33.30s , -33d 38m 44.9s) |   C |    40 | 19.6 |        
     250 | 2026-02-07 05:46:18 |         MASTER-OAFA | (10h 51m 33.38s , -33d 38m 43.0s) |   C |    50 | 19.7 |        
     311 | 2026-02-07 05:47:14 |         MASTER-OAFA | (10h 51m 33.48s , -33d 38m 40.8s) |   C |    60 | 19.8 |        
     382 | 2026-02-07 05:48:20 |         MASTER-OAFA | (10h 51m 33.59s , -33d 38m 38.3s) |   C |    70 | 19.8 |        
     644 | 2026-02-07 05:52:17 |         MASTER-OAFA | (10h 42m 03.76s , -34d 05m 23.7s) |   C |   120 | 19.9 |        
     799 | 2026-02-07 05:52:17 |         MASTER-OAFA | (10h 42m 03.76s , -34d 05m 23.7s) |   C |   430 | 20.7 |  Coadd 
     781 | 2026-02-07 05:54:24 |         MASTER-OAFA | (10h 42m 04.00s , -34d 05m 19.4s) |   C |   140 | 19.9 |        
     942 | 2026-02-07 05:56:50 |         MASTER-OAFA | (10h 42m 04.28s , -34d 05m 14.5s) |   C |   170 | 19.9 |        
    1064 | 2026-02-07 05:59:47 |         MASTER-OAFA | (10h 42m 04.50s , -34d 05m 10.9s) |   C |    60 | 19.7 |        
    1129 | 2026-02-07 06:00:52 |         MASTER-OAFA | (10h 42m 04.62s , -34d 05m 08.8s) |   C |    60 | 19.7 |        
    1194 | 2026-02-07 06:01:58 |         MASTER-OAFA | (10h 42m 04.73s , -34d 05m 07.0s) |   C |    60 | 19.7 |        
Filter C is a clear (unfiltred) band. 


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

[1] - V.M. Lipunov, V.G. Kornilov, E.S. Gorbovskoy, N.A. Tiurina & A.S.Kuznetsov, 2023,  Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591pp.
http : // www.pereplet.ru/lipunov/625.html