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GCN Circular 34262

Subject
Integral GRB230725.99: Global MASTER-Net observations report
Date
2023-07-25T23:57:26Z (2 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
legacy email
V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, 
G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov,  D.Cheryasov, Ya.Kechin
(Lomonosov Moscow State University, SAI, Physics Department),

R. Podesta, C.Lopez, F. Podesta, C.Francile 
(Observatorio Astronomico Felix Aguilar OAFA),

R. Rebolo, M. Serra 
(The Instituto de Astrofisica de Canarias),

D. Buckley 
(South African Astronomical Observatory),

O.A. Gres, N.M. Budnev
(Irkutsk State University, API),

L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez 
(INAOE, Guillermo Haro Astrophysics Observatory),

A. Tlatov, D. Dormidontov 
(Kislovodsk Solar Station of the Pulkovo Observatory),

A. Gabovich, V.Yurkov 
(Blagoveschensk Educational State University)


MASTER-Kislovodsk robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Integral GRB230725.99 (trigger No 10337,02h 43m 32.74s , +61d 39m 03.2s, R=0.0547) errorbox  6 sec after notice time and 30 sec after trigger time at 2023-07-25 23:40:33 UT, with upper limit up to  16.8 mag. The observations began at zenith distance = 39 deg. The sun  altitude  is -19.2 deg. 

MASTER-Tavrida robotic telescope  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Integral GRB230725.99 errorbox  18 sec after notice time and 42 sec after trigger time at 2023-07-25 23:40:45 UT, with upper limit up to  18.7 mag. The observations began at zenith distance = 42 deg. The sun  altitude  is -21.5 deg. 

The galactic latitude b =  2 deg., longitude l = 136 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2245024

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

      35 |   MASTER-Kislovodsk |  P- |    10 | 14.5 |        
      35 |   MASTER-Kislovodsk |  P| |    10 | 15.5 |        
      48 |      MASTER-Tavrida |   C |    10 | 17.1 |        
      53 |   MASTER-Kislovodsk |  P- |    10 | 14.5 |        
      53 |   MASTER-Kislovodsk |  P| |    10 | 15.5 |        
      67 |      MASTER-Tavrida |   C |    10 | 17.4 |        
      89 |      MASTER-Tavrida |   C |    20 | 17.8 |        
     116 |      MASTER-Tavrida |   C |    20 | 17.8 |        
     130 |   MASTER-Kislovodsk |  P- |    20 | 15.4 |        
     130 |   MASTER-Kislovodsk |  P| |    20 | 16.2 |        
     149 |      MASTER-Tavrida |   C |    30 | 18.0 |        
     163 |   MASTER-Kislovodsk |  P| |    30 | 16.3 |        
     187 |      MASTER-Tavrida |   C |    30 | 18.0 |        
     229 |      MASTER-Tavrida |   C |    40 | 18.1 |        
     281 |      MASTER-Tavrida |   C |    50 | 18.3 |        
     311 |   MASTER-Kislovodsk |  P| |    60 | 16.8 |        
     342 |      MASTER-Tavrida |   C |    60 | 18.3 |        
     420 |      MASTER-Tavrida |   C |    80 | 18.5 |        
     514 |      MASTER-Tavrida |   C |    90 | 18.7 |        
     621 |      MASTER-Tavrida |   C |   110 | 18.7 |        
Filter C is a clear (unfiltred) band. 


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