TITLE:   GCN CIRCULAR
NUMBER:  23530
SUBJECT: GRB 181213A : TSHAO optical observations
DATE:    18/12/13 17:45:03 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

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

We observed the field of GRB 181213A (Evans et al., GCN 23525; Osborne 
et al., GCN 23528) with Zeiss-1000 1-m telescope of Tien Shan 
Astronomical Observatory starting on Dec. 13 (UT) 13:39:23.  We detected 
the OT reported earlier (Lipunov et al., GCN 23526; Hu et al. GCN 23527; 
  Siegel  et al., GCN 23529). Preliminary photometry of the object is 
following.

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

2018-12-13 13:39:23 0.04427 R      2640 17.27 0.08 21.8

The photometry is based on nearby USNO-B1.0 stars
USNO-B1.0_id R2
1684-0061916 15.83
1684-0061968 16.55