[vsnet-grb-info 14722] GRB 140320C: Mondy optical observations and afterglow confirmation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16036
SUBJECT: GRB 140320C: Mondy optical observations and afterglow confirmation
DATE:    14/03/25 12:03:24 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

A.Volnova (IKI),  E. Klunko (ISTP),  I. Korobtsev (ISTP), M. Eselevich
(ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up
collaboration:

We observed the field of GRB 140320C (Mereghetti  et al., GCN 16007)
with AZT-33IK telescope of Mondy observatory starting on Mar. 20 (UT)
15:12:44 and Mar. 23 (UT) 15:37:46. Several images of 120 s exposure in 
R-filter ere obtained in both epochs.  After receiving all data sets we 
refined our measurements of the optical source N3 reported early as one 
of a possible afterglow candidate (Volnova et al., GCN 16012). Enhanced 
position of the source is (J2000) 08 57 34.40 +71 11 54.7 (uncertainty 
of  0.35" is each coordinate) is within XRT error circle and  apart 1.1" 
of the center of XRT localization (Pagani  et al., GCN 16017). A 
photometry of the source:


date       UT start   t-T0      Exp.  Filter  OT     err
                      (mid, days) (s)
2014-03-20 15:12:44  0.08918    1560  R       22.63  0.24
2014-03-20 15:38:46  0.12147    3840  R       23.14  0.28
2014-03-23 15:37:46  3.13782    6960  R       23.5   (3 sigma upper limit)

is based on two USNO-B1.0 stars (R2 mags)

N       Id                      RA               Dec.           R
1       1612-0081687            08:57:32.78     +71:12:43.9     18.9
3       1611-0081293            08:57:55.56     +71:10:05.6     18.8

Based on our photometry we confirm the source N3 (Volnova et al., GCN 
16012) is the afterglow of GRB 140320C.

Finding chart can be found at
http://grb.rssi.ru/GRB140320C/140320C_AZT33IK_fc.png