GCN Circular 15735
Subject
GRB 140103A: AAO optical afterglow candidate
Event
Date
2014-01-14T20:23:50Z (13 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
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 optical counterpart of the Swift GRB 140103A (Mangano et
al., GCN 15656) with AS-32 (0.7m) telescope of Abastumani Observatory on
Jan. 3 and 4. We obtained several unfiltered images of 120 s exposure
during each observational set. In the refined XRT position (Mangano, GCN
15666) we do not detect any object in stacked images. However we found a
fading object which is not present in SDSS catalog. The coordinates of
the obsjet is (J2000) RA=15 28 20.73, Dec = +37 45 28.8 with
uncertainity of 0.3" in each coordinate. The position of the fading
object is 5.2" from the refined XRT position (Mangano, GCN 15666). Due
to fading nature of the new object we suggest it as an afterglow of the
GRB 140103A.
Details of the photometry is following:
Date T_start t-t0, Filter Exp., OT err.
(UT) mid, d s
2014-01-03 01:21:18 0.03953 None 5*120 21.14 0.12
2014-01-03 01:34:40 0.05345 None 10*120 21.35 0.12
2014-01-03 02:01:21 0.07662 None 15*120 21.41 0.11
2014-01-04 01:47:48 1.08483 None 34*120 >22.3 (3 sigma)
The photometry is based on SDSS DR9 stars and gri -> R transformations
(Lupton):
N SDSS_id R(Lupton)
1 J152814.09+374706.3 18.20
2 J152819.83+374538.8 15.61
Finding chart and a light curve of the afterglow can be found in
http://grb.rssi.ru/GRB140103A/grb140103A_chart.png
and
http://grb.rssi.ru/GRB140103A/grb140103A_lc.PNG