[vsnet-grb-info 21311] GRB 181103A: AbAO optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  23410
SUBJECT: GRB 181103A: AbAO optical upper limit
DATE:    18/11/05 08:51:38 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

A. Volnova  (IKI),   A. Pozanenko (IKI), R. Inasaridze (AbAO), E. 
Mazaeva (IKI),  S. Belkin (IKI), V. Ayvazian  (AbAO),  O. Kvaratskhelia 
(AbAO), G. Kapanadze (AbAO), I. Molotov (KIAM) report on behalf of 
larger GRB follow-up collaboration:

We observed the field of the Swift GRB 181103A (Tohuvavohu et al., GCN 
23402) with AS-32 (0.7m) telescope of Abastumani Observatory starting on 
  Nov. 3 (UT) 15:02:42.   We do not detect any object within  enhanced 
XRT position (Evans et al., GCN 23403). In particular we do not detect 
the source reported by LaPorte et al. (GCN 23407). Preliminary 
photometry of the field is following:

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

2018-11-03 15:02:42   0.47151   R      63*60  n/d   n/d  20.5

The photometry is based on nearby SDSS-DR12 stars (R, Lupton 
transformation).