TITLE:   GCN CIRCULAR
NUMBER:  15730
SUBJECT: GRB 140102A: AAO optical upper limits
DATE:    14/01/14 14:33:36 GMT
FROM:    Alina Volnova at SAI MSU  <alinusss@gmail.com>

GRB 140102A: AAO optical upper limits

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

We observed the field of GRB 140102A (Hagen et al., GCN 15653) with
AS-32 (0.7m) telescope of Abastumani Observatory on Jan. 5 and 6. We
obtained several unfiltered images of 120 s exposure during each
observational set. On stacked images in the enhanced XRT circle (Goad
et al., GCN 15657) we do not detect the optical afterglow.


The details of the photometry are the following:

Date             T_start     t-t0,        exp.,      Uplim
                     (UT)        mid, d     s            3 sigma

2014-01-05   00:48:24   2.13972   38x120   22.5
2014-01-06   01:04:20   3.18687   32x120   22.3

The photometry is based on the SDSS reference stars from Xu (GCN 15655)
using gri -> R transformations by Lupton 2005:

N  SDSS_id                     R(Lupton)
1  J140740.98+011949.8   17.59
2  J140742.47+012010.4   17.51