[vsnet-grb-info 27115] Fermi trigger No 631226368: Global MASTER-Net observations report

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  29218
SUBJECT: Fermi  trigger No 631226368: Global MASTER-Net observations report 
DATE:    21/01/01 21:15:28 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 GRB210101.86 (trigger No 631226368,00h 41m 12.00s , -06d 54m 36.0s, R=5.18) errorbox  1084 sec after notice time and 1131 sec after trigger time at 2021-01-01 20:58:15 UT, with upper limit up to  17.5 mag. The observations began at zenith distance = 68 deg. The sun  altitude  is -29.6 deg. 

The galactic latitude b = -69 deg., longitude l = 117 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1516942

We obtain a following upper limits.  

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

    1222 | 2021-01-01 20:58:15 |         MASTER-SAAO | (00h 33m 18.21s , -07d 00m 06.7s) |   C |   180 | 17.5 |        
    1421 | 2021-01-01 21:01:35 |         MASTER-SAAO | (00h 33m 18.46s , -07d 01m 39.8s) |   C |   180 | 17.5 |        
    1621 | 2021-01-01 21:04:54 |         MASTER-SAAO | (00h 33m 22.08s , -07d 00m 17.2s) |   C |   180 | 17.4 |        
Filter C is a clear (unfiltred) band. 


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