TITLE:   GCN CIRCULAR
NUMBER:  31728
SUBJECT: Fermi GRB 220310B: Global MASTER-Net observations report 
DATE:    22/03/10 03:15:26 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, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov,  D.Cheryasov, Ya.Kechin
(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),

L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez 
(INAOE, Guillermo Haro Astrophysics Observatory),

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

A. Gabovich, V.Yurkov 
(Blagoveschensk Educational State University)


MASTER-OAGH robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Mexico (OAGH National Institute for Astrophysics, Optics and Electronics) started inspect of the Fermi GRB 220310B ( Fermi GBM team, GCN 31727) errorbox  553 sec after notice time and 582 sec after trigger time at 2022-03-10 03:04:50 UT, with upper limit up to  19.3 mag. The observations began at zenith distance = 45 deg. The sun  altitude  is -22.6 deg. 

The galactic latitude b = 14 deg., longitude l = 139 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1905827

We obtain a following upper limits.  

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

     642 | 2022-03-10 03:04:50 |         MASTER-OAGH | (04h 14m 41.43s , +69d 34m 27.5s) |   C |   120 | 18.8 |        
     642 | 2022-03-10 03:04:50 |         MASTER-OAGH | (04h 13m 44.40s , +69d 58m 56.3s) |   C |   120 | 19.0 |        
     793 | 2022-03-10 03:07:11 |         MASTER-OAGH | (04h 14m 40.88s , +69d 35m 33.4s) |   C |   140 | 18.8 |        
     793 | 2022-03-10 03:07:11 |         MASTER-OAGH | (04h 13m 43.73s , +70d 00m 01.8s) |   C |   140 | 19.1 |        
     970 | 2022-03-10 03:09:52 |         MASTER-OAGH | (04h 14m 48.31s , +69d 34m 34.1s) |   C |   170 | 18.9 |        
     970 | 2022-03-10 03:09:52 |         MASTER-OAGH | (04h 13m 51.11s , +69d 59m 04.3s) |   C |   170 | 19.3 |        
Filter C is a clear (unfiltred) band. 


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