[vsnet-grb-info 28559] Swift GRB210818.68: Global MASTER-Net observations report

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  30662
SUBJECT: Swift GRB210818.68: Global MASTER-Net observations report 
DATE:    21/08/19 16:21:54 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-Tavrida robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Swift GRB210818.68 (trigger No 1069242,19h 58m 22.32s , +35d 11m 39.5s, R=0.0015) errorbox  5096 sec after notice time and 5059 sec after trigger time at 2021-08-18 17:43:40 UT, with upper limit up to  18.0 mag. Observations started at twilight.  The observations began at zenith distance = 26 deg. The sun  altitude  is -10.8 deg. 

MASTER-Kislovodsk robotic telescope  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Swift GRB210818.68 errorbox  6531 sec after notice time and 6495 sec after trigger time at 2021-08-18 18:07:35 UT, with upper limit up to  17.5 mag. The observations began at zenith distance = 16 deg. The sun  altitude  is -19.6 deg. 

MASTER-IAC robotic telescope  located in Spain (IAC Teide Observatory) was pointed to the Swift GRB210818.68 errorbox  22873 sec after notice time and 22836 sec after trigger time at 2021-08-18 22:39:57 UT, with upper limit up to  17.5 mag. The observations began at zenith distance = 10 deg. The sun  altitude  is -35.9 deg. 

MASTER-OAFA robotic telescope  located in Argentina (OAFA observatory of San Juan National University) was pointed to the Swift GRB210818.68 errorbox  26839 sec after notice time and 26802 sec after trigger time at 2021-08-18 23:46:02 UT, with upper limit up to  15.5 mag. The observations began at zenith distance = 78 deg. The sun  altitude  is -20.9 deg. 

The galactic latitude b =  3 deg., longitude l = 72 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1693885

We obtain a following upper limits.  

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

    5150 |      MASTER-Tavrida |   C |   180 | 16.7 |        
    5330 |      MASTER-Tavrida |   C |   540 | 17.1 |  Coadd 
    5349 |      MASTER-Tavrida |   C |   180 | 16.9 |        
    5548 |      MASTER-Tavrida |   C |   180 | 17.0 |        
    5747 |      MASTER-Tavrida |   C |   180 | 17.1 |        
    5927 |      MASTER-Tavrida |   C |   540 | 17.4 |  Coadd 
    5946 |      MASTER-Tavrida |   C |   180 | 17.1 |        
    6145 |      MASTER-Tavrida |   C |   180 | 17.2 |        
    6345 |      MASTER-Tavrida |   C |   180 | 17.1 |        
    6525 |      MASTER-Tavrida |   C |   540 | 17.0 |  Coadd 
    6544 |      MASTER-Tavrida |   C |   180 | 16.8 |        
    6585 |   MASTER-Kislovodsk |   C |   180 | 13.3 |        
    6765 |   MASTER-Kislovodsk |   C |   540 | 15.9 |  Coadd 
    6585 |   MASTER-Kislovodsk |   C |   180 | 13.8 |        
    6765 |   MASTER-Kislovodsk |   C |   540 | 16.1 |  Coadd 
    6743 |      MASTER-Tavrida |   C |   180 | 15.6 |        
    6786 |   MASTER-Kislovodsk |   C |   180 | 14.7 |        
    6786 |   MASTER-Kislovodsk |   C |   180 | 14.8 |        
    6942 |      MASTER-Tavrida |   C |   180 | 17.1 |        
    7122 |      MASTER-Tavrida |   C |   540 | 17.5 |  Coadd 
    6986 |   MASTER-Kislovodsk |   C |   180 | 16.3 |        
    6986 |   MASTER-Kislovodsk |   C |   180 | 16.3 |        
    7141 |      MASTER-Tavrida |   C |   180 | 17.3 |        
    7187 |   MASTER-Kislovodsk |   C |   180 | 16.8 |        
    7187 |   MASTER-Kislovodsk |   C |   180 | 16.7 |        
    7340 |      MASTER-Tavrida |   C |   180 | 17.3 |        
    7962 |   MASTER-Kislovodsk |   C |   180 | 17.0 |        
    7962 |   MASTER-Kislovodsk |   C |   180 | 17.0 |        
    8448 |   MASTER-Kislovodsk |   C |   180 | 17.5 |        
    8448 |   MASTER-Kislovodsk |   C |   180 | 17.4 |        
    8731 |   MASTER-Kislovodsk |   C |   180 | 17.3 |        
    8731 |   MASTER-Kislovodsk |   C |   180 | 17.3 |        
    9014 |   MASTER-Kislovodsk |   C |   180 | 16.4 |        
    9014 |   MASTER-Kislovodsk |   C |   180 | 16.5 |        
   10273 |      MASTER-Tavrida |   C |   180 | 16.9 |        
   10865 |   MASTER-Kislovodsk |   C |   180 | 16.6 |        
   10865 |   MASTER-Kislovodsk |   C |   180 | 16.7 |        
   12671 |   MASTER-Kislovodsk |   C |   180 | 16.3 |        
   12671 |   MASTER-Kislovodsk |   C |   180 | 16.3 |        
   14474 |   MASTER-Kislovodsk |   C |   180 | 17.0 |        
   14474 |   MASTER-Kislovodsk |   C |   180 | 17.0 |        
   16278 |   MASTER-Kislovodsk |   C |   180 | 16.1 |        
   16278 |   MASTER-Kislovodsk |   C |   180 | 15.9 |        
   16891 |      MASTER-Tavrida |   C |   180 | 17.0 |        
   17790 |      MASTER-Tavrida |   C |   180 | 17.8 |        
   18446 |      MASTER-Tavrida |   C |   180 | 17.8 |        
   18735 |      MASTER-Tavrida |   C |   180 | 14.9 |        
   19022 |      MASTER-Tavrida |   C |   180 | 15.1 |        
   20563 |      MASTER-Tavrida |   C |   180 | 17.7 |        
   22927 |          MASTER-IAC |   C |   180 | 17.3 |        
   22927 |          MASTER-IAC |   C |   180 | 17.0 |        
   23127 |          MASTER-IAC |   C |   180 | 17.4 |        
   23127 |          MASTER-IAC |   C |   180 | 17.1 |        
   23527 |          MASTER-IAC |   C |   180 | 17.3 |        
   23527 |          MASTER-IAC |   C |   180 | 17.2 |        
   23932 |          MASTER-IAC |   C |   180 | 17.4 |        
   23932 |          MASTER-IAC |   C |   180 | 17.1 |        
   24400 |      MASTER-Tavrida |   C |   180 | 18.0 |        
   24934 |          MASTER-IAC |   C |   180 | 17.3 |        
   24934 |          MASTER-IAC |   C |   180 | 17.1 |        
   26735 |          MASTER-IAC |   C |   180 | 17.4 |        
   26735 |          MASTER-IAC |   C |   180 | 17.2 |        
   26892 |         MASTER-OAFA |   C |   180 | 15.0 |        
   27128 |         MASTER-OAFA |   C |   180 | 15.3 |        
   27718 |         MASTER-OAFA |   C |   180 | 15.5 |        
   28166 |      MASTER-Tavrida |   C |   180 | 18.0 |        
   28739 |          MASTER-IAC |   C |   180 | 17.3 |        
   28739 |          MASTER-IAC |   C |   180 | 17.2 |        
   30740 |          MASTER-IAC |   C |   180 | 17.3 |        
   30740 |          MASTER-IAC |   C |   180 | 17.1 |        
   32543 |          MASTER-IAC |   C |   180 | 17.3 |        
   32543 |          MASTER-IAC |   C |   180 | 17.0 |        
   34348 |          MASTER-IAC |   C |   180 | 17.3 |        
   34348 |          MASTER-IAC |   C |   180 | 17.0 |        
   36161 |          MASTER-IAC |   C |   180 | 17.3 |        
   36161 |          MASTER-IAC |   C |   180 | 17.2 |        
   37985 |          MASTER-IAC |   C |   180 | 17.4 |        
   37985 |          MASTER-IAC |   C |   180 | 17.2 |        
   39809 |          MASTER-IAC |   C |   180 | 17.5 |        
   39809 |          MASTER-IAC |   C |   180 | 17.5 |        
   41613 |          MASTER-IAC |   C |   180 | 17.4 |        
   41613 |          MASTER-IAC |   C |   180 | 17.3 |        
Filter C is a clear (unfiltred) band. 


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