[vsnet-grb-info 28073] Swift GRB 210610B: Global MASTER-Net observations report

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  30176
SUBJECT: Swift GRB 210610B: Global MASTER-Net observations report 
DATE:    21/06/10 21:15:40 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at 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-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 Swift GRB 210610B ( K. L. Page et al., GCN 30170) errorbox 145 sec after trigger time at 2021-06-10 19:53:52 UT, with upper limit up to  18.9 mag. The observations began at zenith distance = 30 deg. The sun  altitude  is -21.6 deg. 

MASTER-SAAO robotic telescope  located in South Africa (South African Astronomical Observatory) was pointed to the Swift GRB 210610B errorbox  0 sec after notice time and 582 sec after trigger time at 2021-06-10 20:01:10 UT, with upper limit up to  19.2 mag. The observations began at zenith distance = 52 deg. The sun  altitude  is -54.2 deg. 

MASTER-Tavrida robotic telescope  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Swift GRB 210610B errorbox  15 sec after notice time and 598 sec after trigger time at 2021-06-10 20:01:25 UT, with upper limit up to  20.3 mag. The observations began at zenith distance = 31 deg. The sun  altitude  is -19.1 deg. 

MASTER-IAC robotic telescope  located in Spain (IAC Teide Observatory) was pointed to the Swift GRB 210610B errorbox  3486 sec after notice time and 4069 sec after trigger time at 2021-06-10 20:59:16 UT, with upper limit up to  17.6 mag. Observations started at twilight.  The observations began at zenith distance = 44 deg. The sun  altitude  is -12.3 deg. 

The galactic latitude b = 40 deg., longitude l = 29 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1633397

We obtain a following upper limits.  

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

     160 |   MASTER-Kislovodsk |   C |    30 | 17.5 |        
     215 |   MASTER-Kislovodsk |   C |    40 | 17.7 |        
     643 |         MASTER-SAAO | P\  |   120 | 18.3 |        
     798 |         MASTER-SAAO | P\  |   430 | 19.0 |  Coadd 
     658 |      MASTER-Tavrida |   C |   120 | 19.1 |        
     838 |      MASTER-Tavrida |   C |   480 | 20.0 |  Coadd 
     658 |      MASTER-Tavrida |   C |   120 | 19.1 |        
     722 |   MASTER-Kislovodsk |   C |   130 | 18.2 |        
     722 |   MASTER-Kislovodsk |  P| |   130 | 18.3 |        
     792 |         MASTER-SAAO | P\  |   140 | 18.4 |        
     813 |      MASTER-Tavrida |   C |   150 | 19.2 |        
     813 |      MASTER-Tavrida |   C |   150 | 19.1 |        
     967 |         MASTER-SAAO | P\  |   170 | 18.5 |        
     997 |      MASTER-Tavrida |   C |   180 | 19.2 |        
     997 |      MASTER-Tavrida |   C |   180 | 19.1 |        
    1161 |         MASTER-SAAO | P\  |   180 | 18.5 |        
    1341 |         MASTER-SAAO | P\  |   540 | 19.1 |  Coadd 
    1197 |      MASTER-Tavrida |   C |   180 | 19.4 |        
    1359 |   MASTER-Kislovodsk |   C |   180 | 13.7 |        
    1359 |   MASTER-Kislovodsk |  P| |   180 | 18.5 |        
    1361 |         MASTER-SAAO | P\  |   180 | 18.6 |        
    1403 |      MASTER-Tavrida |   C |   180 | 19.5 |        
    1403 |      MASTER-Tavrida |   C |   180 | 19.1 |        
    1560 |         MASTER-SAAO | P\  |   180 | 18.5 |        
    1603 |      MASTER-Tavrida |   C |   180 | 19.5 |        
    1603 |      MASTER-Tavrida |   C |   180 | 19.3 |        
    1760 |         MASTER-SAAO | P\  |   180 | 18.6 |        
    1940 |         MASTER-SAAO | P\  |   540 | 19.2 |  Coadd 
    1802 |      MASTER-Tavrida |   C |   180 | 19.4 |        
    1802 |      MASTER-Tavrida |   C |   180 | 19.1 |        
    1959 |         MASTER-SAAO | P\  |   180 | 18.7 |        
    2001 |      MASTER-Tavrida |   C |   180 | 19.5 |        
    2181 |      MASTER-Tavrida |   C |   540 | 20.2 |  Coadd 
    2001 |      MASTER-Tavrida |   C |   180 | 19.1 |        
    2019 |   MASTER-Kislovodsk |   C |   180 | 18.2 |        
    2019 |   MASTER-Kislovodsk |  P| |   180 | 18.9 |        
    2159 |         MASTER-SAAO | P\  |   180 | 18.5 |        
    2201 |      MASTER-Tavrida |   C |   180 | 19.5 |        
    2201 |      MASTER-Tavrida |   C |   180 | 19.3 |        
    2358 |         MASTER-SAAO | P\  |   180 | 18.6 |        
    2401 |      MASTER-Tavrida |   C |   180 | 19.6 |        
    2401 |      MASTER-Tavrida |   C |   180 | 19.4 |        
    2558 |         MASTER-SAAO | P\  |   180 | 16.5 |        
    2600 |      MASTER-Tavrida |   C |   180 | 19.6 |        
    2780 |      MASTER-Tavrida |   C |   540 | 20.3 |  Coadd 
    2600 |      MASTER-Tavrida |   C |   180 | 19.3 |        
    2743 |   MASTER-Kislovodsk |   C |   180 | 13.8 |        
    2743 |   MASTER-Kislovodsk |  P| |   180 | 18.9 |        
    2757 |         MASTER-SAAO | P\  |   180 | 15.7 |        
    2800 |      MASTER-Tavrida |   C |   180 | 19.6 |        
    2800 |      MASTER-Tavrida |   C |   180 | 19.4 |        
    2957 |         MASTER-SAAO | P\  |   180 | 17.3 |        
    2999 |      MASTER-Tavrida |   C |   180 | 19.7 |        
    2999 |      MASTER-Tavrida |   C |   180 | 19.4 |        
    3156 |         MASTER-SAAO | P\  |   180 | 16.6 |        
    3199 |      MASTER-Tavrida |   C |   180 | 18.8 |        
    3379 |      MASTER-Tavrida |   C |   540 | 19.9 |  Coadd 
    3199 |      MASTER-Tavrida |   C |   180 | 18.3 |        
    3356 |         MASTER-SAAO | P\  |   180 | 17.2 |        
    3398 |      MASTER-Tavrida |   C |   180 | 19.6 |        
    3398 |      MASTER-Tavrida |   C |   180 | 18.9 |        
    3418 |   MASTER-Kislovodsk |   C |   180 | 18.3 |        
    3418 |   MASTER-Kislovodsk |  P| |   180 | 18.8 |        
    3555 |         MASTER-SAAO | P\  |   180 | 17.0 |        
    3598 |      MASTER-Tavrida |   C |   180 | 19.6 |        
    3598 |      MASTER-Tavrida |   C |   180 | 19.2 |        
    3755 |         MASTER-SAAO | P\  |   180 | 17.3 |        
    3797 |      MASTER-Tavrida |   C |   180 | 19.5 |        
    3797 |      MASTER-Tavrida |   C |   180 | 19.2 |        
    3954 |         MASTER-SAAO | P\  |   180 | 15.7 |        
    3997 |      MASTER-Tavrida |   C |   180 | 19.8 |        
    3997 |      MASTER-Tavrida |   C |   180 | 19.4 |        
    4154 |         MASTER-SAAO | P\  |   180 | 16.4 |        
    4099 |          MASTER-IAC |   C |    60 | 17.6 |        
    4099 |          MASTER-IAC |   C |    60 | 17.3 |        
    4239 |          MASTER-IAC |   I |   180 | 16.9 |        
    4239 |          MASTER-IAC |   R |   180 | 17.1 |        
Filter C is a clear (unfiltred) band. 


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