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GCN Circular 34157

Subject
Fermi GRB 230707A: Global MASTER-Net observations report
Date
2023-07-07T04:15:50Z (2 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
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-OAGH robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Mexico (OAGH National Institute for Astrophysics, Optics and Electronics) started inspect of the Fermi GRB 230707A ( Fermi GBM team, GCN 34156Loading...
 
 ) errorbox  174 sec after notice time and 210 sec after trigger time at 2023-07-07 03:26:21 UT, with upper limit up to  18.0 mag. Observations started at twilight.  The observations began at zenith distance = 71 deg. The sun  altitude  is -11.9 deg. 

MASTER-OAFA robotic telescope  located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 230707A errorbox  804 sec after notice time and 840 sec after trigger time at 2023-07-07 03:36:52 UT, with upper limit up to  12.3 mag. The observations began at zenith distance = 87 deg. The sun  altitude  is -73.8 deg. 

The galactic latitude b = 42 deg., longitude l = 279 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2234493

We obtain a following upper limits.  

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

     230 | 2023-07-07 03:26:21 |         MASTER-OAGH | (11h 31m 43.96s , -18d 19m 29.8s) |   C |    40 | 16.8 |        
     451 | 2023-07-07 03:29:42 |         MASTER-OAGH | (11h 31m 38.19s , -18d 20m 47.6s) |   C |    80 | 17.2 |        
     916 | 2023-07-07 03:36:42 |         MASTER-OAGH | (11h 35m 36.07s , -17d 26m 31.7s) |   C |   170 | 17.8 |        
     906 | 2023-07-07 03:36:52 |         MASTER-OAFA | (11h 33m 57.32s , -16d 58m 43.3s) |   C |   130 | 12.3 |        
    1251 | 2023-07-07 03:42:12 |         MASTER-OAGH | (11h 35m 36.41s , -17d 28m 18.2s) |   C |   180 | 18.0 |        
    1592 | 2023-07-07 03:47:53 |         MASTER-OAGH | (11h 31m 07.26s , -16d 16m 23.9s) |   C |   180 | 17.7 |        
    1934 | 2023-07-07 03:53:35 |         MASTER-OAGH | (11h 39m 30.22s , -16d 16m 43.2s) |   C |   180 | 18.0 |        
    2274 | 2023-07-07 03:59:15 |         MASTER-OAGH | (11h 31m 16.26s , -16d 16m 40.2s) |   C |   180 | 17.7 |        
    2620 | 2023-07-07 04:05:01 |         MASTER-OAGH | (11h 39m 28.83s , -16d 16m 03.1s) |   C |   180 | 18.0 |        
Filter C is a clear (unfiltred) band. 


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