[vsnet-grb-info 15244] GRB 140703A: AAO optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16536
SUBJECT: GRB 140703A: AAO optical observations
DATE:    14/07/07 15:24:58 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

A. Volnova (IKI), R. Inasaridze (AAO), O. Kvaratskhelia (AAO), V.
Ayvazian (AAO), Yu. Krugly (IA KhNU), I. Molotov (KIAM), A. Pozanenko
(IKI) report on behalf of larger GRB follow-up collaboration:

We observed the Swift GRB 140703A (Kocevski et al., GCN 16503) with 
AS-32 (0.7m) telescope of Abastumani Observatory starting on July, 07 
(UT) 23:27:06. We obtained several unfiltered frames under exellent 
weather with exposure of each frame of 120 s. The  optical afterglow 
(Cunniffe et al. GCN16504) is well detected on the stacked image.

Details of a photometry of the pi-redsifted GRB 140703A (Castro-Tirado 
et al., GCN 16505) are following:

date       UT start   t-T0       Filter  Exp.    OT        err
                      (mid, days)         (s)

2014-07-03 23:27:06  0.97235     None    23*120  21.27 +/- 0.08

The photometry is based on following SDSS stars and gri -> R 
transformation (Lupton, 2005)

SDSS id              R_Lupton
J005158.97+450627.1  17.374 ± 0.011
J005153.14+450619.0  16.257 ± 0.011
J005202.70+450621.8  18.216 ± 0.014


Finding chart can be found at
http://grb.rssi.ru/GRB140703A/GRB140703A_AAO_fc.png