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GCN Circular 30586

Subject
Fermi trigger No 649627691: Global MASTER-Net observations report
Date
2021-08-02T20:16:41Z (3 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, 
V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva,
D.Kuvshinov,  D. Cheryasov
(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, O.Ershova 
(Irkutsk State University, API),

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

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




MASTER-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB210802.84 (trigger No 649627691,15h 21m 26.40s , +32d 07m 12.0s, R=1) errorbox  44 sec after notice time and 56 sec after trigger time at 2021-08-02 20:09:03 UT, with upper limit up to  17.7 mag. The observations began at zenith distance = 75 deg. The sun  altitude  is -52.1 deg. 

MASTER-Tavrida robotic telescope  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB210802.84 errorbox  99 sec after notice time and 111 sec after trigger time at 2021-08-02 20:09:58 UT, with upper limit up to  18.2 mag. The observations began at zenith distance = 44 deg. The sun  altitude  is -24.3 deg. 

The galactic latitude b = 57 deg., longitude l = 51 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1678958

We obtain a following upper limits.  

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

      62 | 2021-08-02 20:09:03 |         MASTER-SAAO | (15h 32m 49.34s , +32d 39m 18.2s) |   C |    10 | 17.1 |        
      96 | 2021-08-02 20:09:32 |         MASTER-SAAO | (15h 32m 55.22s , +32d 38m 20.3s) |   C |    20 | 17.7 |        
     122 | 2021-08-02 20:09:58 |      MASTER-Tavrida | (15h 34m 32.89s , +32d 26m 04.8s) |   C |    20 | 18.2 |        
     135 | 2021-08-02 20:10:11 |         MASTER-SAAO | (15h 21m 09.74s , +32d 11m 08.8s) | P\  |    20 | 15.8 |        
     166 | 2021-08-02 20:10:37 |      MASTER-Tavrida | (15h 22m 58.48s , +31d 57m 51.2s) |  P\ |    30 | 16.0 |        
     180 | 2021-08-02 20:10:51 |         MASTER-SAAO | (15h 21m 16.80s , +32d 11m 21.8s) | P\  |    30 | 15.8 |        
     220 | 2021-08-02 20:11:26 |      MASTER-Tavrida | (15h 22m 51.94s , +31d 56m 46.2s) |  P\ |    40 | 16.0 |        
Filter C is a clear (unfiltred) band. 


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