GRB 260708.42

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),
M. Segura,  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) was pointed to the LAT GRB260708.42 (trigger No 805198281,15h 02m 26.40s , -44d 04m 12.0s, R=0.369833) errorbox  23412 sec after notice time and 44923 sec after trigger time at 2026-07-08 22:40:00 UT, with upper limit up to  18.6 mag. Observations started at twilight.  The observations began at zenith distance = 25 deg. The sun  altitude  is -11.4 deg. 

The galactic latitude b = 12 deg., longitude l = 327 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3420593

We obtain a following upper limits.  

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

   44954 | 2026-07-08 22:40:00 |         MASTER-OAFA | (15h 01m 59.54s , -43d 52m 20.2s) |   C |    60 | 17.8 |        
   45029 | 2026-07-08 22:41:16 |         MASTER-OAFA | (15h 02m 05.06s , -43d 53m 19.4s) |   C |    60 | 18.1 |        
   45108 | 2026-07-08 22:42:34 |         MASTER-OAFA | (15h 02m 00.49s , -43d 54m 17.7s) |   C |    60 | 18.6 |        
   45182 | 2026-07-08 22:43:49 |         MASTER-OAFA | (15h 02m 05.32s , -43d 54m 07.3s) |   C |    60 | 18.5 |        
   45255 | 2026-07-08 22:45:02 |         MASTER-OAFA | (15h 02m 02.92s , -43d 52m 33.7s) |   C |    60 | 17.7 |        
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