TITLE:   GCN CIRCULAR
NUMBER:  31403
SUBJECT: Fermi GRB 220107A: Global MASTER-Net observations report 
DATE:    22/01/07 20:15:25 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>

V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, 
D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, T.Pogrosheva, E.Minkina,
A.Chasovnikov, V.Topolev, V.Grinshpun, 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
(Irkutsk State University, API),

B.L.Carrasco, J.R.Valdes,V.Chavushyan, C.J.Martinez, V.M.Patino Alvarez,
M.L.H.Rodriguez (INAOE, OAGH)

A. Tlatov, D. Dormidontov 
(Kislovodsk Solar Station of the Pulkovo Observatory),

A. Gabovich, V.Yurkov 
(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) started inspect of the Fermi GRB 220107A ( Fermi GBM team, GCN 31399) errorbox  14945 sec after notice time and 14974 sec after trigger time at 2022-01-07 18:55:06 UT, with upper limit up to  18.6 mag. The observations began at zenith distance = 73 deg. The sun  altitude  is -48.3 deg. 

The galactic latitude b = 68 deg., longitude l = 187 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1841973

We obtain a following upper limits.  

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

   15004 | 2022-01-07 18:55:06 |      MASTER-Tavrida | (11h 04m 15.78s , +35d 40m 05.4s) |   C |    60 | 13.2 |        
   15163 | 2022-01-07 18:57:45 |      MASTER-Tavrida | (11h 07m 37.93s , +33d 44m 04.2s) |   C |    60 | 12.8 |        
   15243 | 2022-01-07 18:59:04 |      MASTER-Tavrida | (11h 17m 11.22s , +33d 45m 44.4s) |   C |    60 | 13.6 |        
   18102 | 2022-01-07 19:46:44 |      MASTER-Tavrida | (11h 11m 38.28s , +37d 34m 23.5s) |   C |    60 | 18.0 |        
   18182 | 2022-01-07 19:48:03 |      MASTER-Tavrida | (11h 04m 13.64s , +35d 40m 14.4s) |   C |    60 | 17.5 |        
   18261 | 2022-01-07 19:49:23 |      MASTER-Tavrida | (11h 14m 10.15s , +35d 39m 14.1s) |   C |    60 | 18.0 |        
   18341 | 2022-01-07 19:50:42 |      MASTER-Tavrida | (11h 07m 30.05s , +33d 44m 06.6s) |   C |    60 | 18.2 |        
   18421 | 2022-01-07 19:52:02 |      MASTER-Tavrida | (11h 17m 13.08s , +33d 44m 18.7s) |   C |    60 | 16.7 |        
   18581 | 2022-01-07 19:54:42 |      MASTER-Tavrida | (11h 23m 01.66s , +35d 39m 47.5s) |   C |    60 | 13.3 |        
   19251 | 2022-01-07 20:05:52 |      MASTER-Tavrida | (11h 11m 42.85s , +37d 33m 19.8s) |   C |    60 | 18.6 |        
   19330 | 2022-01-07 20:07:11 |      MASTER-Tavrida | (11h 04m 17.45s , +35d 38m 35.9s) |   C |    60 | 17.6 |        
   19409 | 2022-01-07 20:08:31 |      MASTER-Tavrida | (11h 14m 05.38s , +35d 40m 09.3s) |   C |    60 | 18.0 |        
Filter C is a clear (unfiltred) band. 


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