[vsnet-grb-info 21378] GRB 181201A: optical observations in SAAO

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  23477
SUBJECT: GRB 181201A: optical observations in SAAO
DATE:    18/12/01 20:06:16 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

A. Volnova (IKI), E. Mazaeva (IKI), D. Buckley (SAAO), A. Pozanenko 
(IKI)  report on behalf of IKI-FuN follow-up collaboration:

We observed  the field of the INTEGRAL GRB 181201A  (Mereghetti et al., 
GCN  23469)  with 1m telescopes of SAOO observatory. Observation started 
on Dec. 01 (UT) 18:34:35 in g'Ri'-filters.  We detected optical 
afterglow  (Podesta et al., GCN  23470; Kong  GCN 23475). Preliminary 
photometry   is following

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

2018-12-01 18:34:35 0.66950  g'     5*180 17.86 0.02
2018-12-01 18:52:05 0.67992  R      5*120 17.38 0.02
2018-12-01 19:02:35 0.68721  i'     5*120 17.32 0.02

The photometry is based on  SDSS DR12 nearby stars.