TITLE:   GCN CIRCULAR
NUMBER:  31751
SUBJECT: GRB 220310A: K-800 of Terskol observatory optical upper limit
DATE:    22/03/13 10:30:02 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

S. Belkin (IKI, HSE), V. Agletdinov (KIAM), A. Pozanenko (IKI), I. 
Sokolov (INASAN, KIAM),  N. Pankov (HSE) report on behalf of GRB IKI FuN:

We observed GRB 220310A (Negoro  et al., GCN 31725; Yoshida et al., GCN 
31730; Svinkin et al., GCN 31748) with K-800 telescope  of Terskol 
observatory starting on Mar. 12 (UTC) 21:34:44. We do not detect the 
optical afterglow (Lipunov et al., GCN 31732;  Kumar et al., GCN 31738; 
Fouad et al., GCN 31750).    Preliminary photometry of the field in 
Clear filter is following


Date       UT start t-T0    Filter     Exp. OT    Err  UL(3sigma)

2022-03-12 21:34:44 2.89151  Clear    68*30  n/d  n/d  20.8


The photometry is based on the nearby SDSS-DR12 stars R (Lupton
transformations)
R.A. Dec R
11:13:05.99760 +23:17:03.0084 16.852
11:12:35.64984 +23:13:33.4308 16.911