[vsnet-grb-info 27478] Integral GRB210227.19: Global MASTER-Net observations report

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  29581
SUBJECT: Integral GRB210227.19: Global MASTER-Net observations report 
DATE:    21/02/27 04:57:06 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-OAFA robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Argentina (OAFA observatory of San Juan National University) was pointed to the Integral GRB210227.19 (trigger No 9020,05h 39m 03.41s , +17d 48m 45.2s, R=0.0488333) errorbox  41 sec after notice time and 52 sec after trigger time at 2021-02-27 04:34:46 UT, with upper limit up to  15.0 mag. The observations began at zenith distance = 85 deg. The sun  altitude  is -50.5 deg. 

The galactic latitude b = -6 deg., longitude l = 189 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1556892

We obtain a following upper limits.  

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

      58 |         MASTER-OAFA |   C |    10 | 14.7 |        
      91 |         MASTER-OAFA |   C |    10 | 14.6 |        
     128 |         MASTER-OAFA |   C |    20 | 14.8 |        
     172 |         MASTER-OAFA |   C |    30 | 15.0 |        
     226 |         MASTER-OAFA |   C |    40 | 15.0 |        
     371 |         MASTER-OAFA |   C |    70 | 14.6 |        
Filter C is a clear (unfiltred) band. 


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