[vsnet-grb-info 27402] Fermi GRB 210213A: Global MASTER-Net observations report

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  29505
SUBJECT: Fermi GRB 210213A: Global MASTER-Net observations report 
DATE:    21/02/13 19:15:07 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-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 GRB 210213A ( Fermi GBM team, GCN 29503) errorbox  2736 sec after notice time and 2763 sec after trigger time at 2021-02-13 18:33:17 UT, with upper limit up to  18.9 mag. Observations started at twilight.  The observations began at zenith distance = 65 deg. The sun  altitude  is -13.2 deg. 

The galactic latitude b = 27 deg., longitude l = 201 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1546624

We obtain a following upper limits.  

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

    2793 | 2021-02-13 18:33:17 |         MASTER-SAAO | (07h 59m 18.94s , +21d 55m 15.3s) |   C |    60 | 18.6 |        
    2873 | 2021-02-13 18:34:37 |         MASTER-SAAO | (08h 06m 26.34s , +23d 55m 29.8s) |   C |    60 | 18.3 |        
    2972 | 2021-02-13 18:36:16 |         MASTER-SAAO | (08h 16m 14.99s , +21d 56m 55.8s) |   C |    60 | 18.9 |        
    3072 | 2021-02-13 18:37:55 |         MASTER-SAAO | (08h 10m 06.28s , +19d 56m 24.2s) |   C |    60 | 17.8 |        
Filter C is a clear (unfiltred) band. 


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