TITLE:   GCN CIRCULAR
NUMBER:  23543
SUBJECT: GRB 181213A: continued TSHAO optical observations
DATE:    18/12/16 11:01:22 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

S. Belkin (IKI), A. Kusakin (FAPHI), A. Pozanenko (IKI), I. Reva 
(FAPHI), E. Mazaeva (IKI), A. Volnova (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. 14 (UT) 13:29:58.  We detected 
the afterglow (Lipunov et al., GCN 23526; Hu et al. GCN 23527;  Siegel 
et al., GCN 23529; Belkin et al., GCN 23530; Heintz et al., GCN 23537). 
Preliminary photometry of the object is following.

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

2018-12-14 13:29:58 1.06482 R      7200 21.65 0.28 21.9

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