TITLE:   GCN CIRCULAR
NUMBER:  31732
SUBJECT: GRB 220310A: MASTER optical counterpart detection
DATE:    22/03/10 10:09:01 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>

V. Lipunov (Lomonosov MSU), D.A.H.Buckley (SAAO),
V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov,
V.Senik, D.Kuvshinov, Ya.Kechin, Yu.Tselik (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),
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 Global Robotic Net (http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)
started MAXI GRB 220310A (Negoro et al. GCN 31725) observations in 
MASTER-OAFA , MASTEr-SAAO, MASTER-Kislovodsk, MASTER-OAGH (Lipunov et al. 31724)
see cover map and OT at https://master.sai.msu.ru/site/master2/observ.php?id=1905736

MASTER OT J111302.33+231508.0 discovery
MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L )
  discovered GRB optical counterpart  at (RA, Dec) = 11h 13m 02.33s +23d 15m 08.0s at 2022-03-10.05882 UT.

The OT unfiltered magnitude at first image is 15.6m (mlim=19.5).
There is no minor planet at this place.

We have reference image on 2018-05-15.77649 UT with  unfiltered mlim=19.5m.

Spectral observations are required.