TITLE:   GCN CIRCULAR
NUMBER:  23951
SUBJECT: GRB 190311A: TSHAO optical observations
DATE:    19/03/11 20:28:35 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

S. Belkin (IKI), I. Reva (FAPHI), A. Pozanenko (IKI), E. Mazaeva (IKI), 
A. Volnova (IKI), A. Kusakin (FAPHI), M. Krugov (FAPHI)  report   on 
behalf of IKI-GRB-FuN:

We observed the afterglow of GRB 190311A (Troja et al.  GCN 23946) with 
Zeiss-1000 1-m telescope of Tien Shan Astronomical Observatory starting 
on Mar. 11 (UT) 15:54:08.   Preliminary photometry of the afterglow 
detected previously (Troja et al.  GCN 23946; Pozanenko et al.  GCN 
23947; Zhu et al.  GCN 23948; Gorbovskoy et al.  GCN 23949) is following.

Date       UT start t-T0    Filter  Exp. OT    Err.  UL
                     (mid, days)     (s)

2019-03-11 15:54:08 0.07228  R      3240 20.87 0.24  21.4

The photometry is based the stars used for calibration in GCN 23947.