GCN Circular 14919
Subject
Swift Trigger 558631: AAO optical observations
Date
2013-06-22T13:42:50Z (12 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@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:
Following trigger Swift #558631 (Barlow et al., GCN 14917) we imaged the
region of the trigger with starting on June 21 (UT) 19:54:46. We
obtained 50 unfiltered images of 50 s exposure. We investigated a
combined image (mid time after the Swift trigger 0.75693 days) and
within BAT error circle (Barlow et al., GCN 14917) found one bright
source which is not catalogued in USNO-B1.0 but barely visible in DSS2
Red image. Coordinates of the source is (J2000) 18:07:13.13 -22:17:14.4.
It is apparent that the source is not coincident with known X-ray source
SAX_J1806.5-221. Brightness of the source is 17.09 +/- 0.03 calibrating
against nearby USNO-B1.0 stars (R2).
At present time it is not clear if the source is related to the Swift
#558631 trigger. The source also can be a new cataclysmic variable with
magnitude of the outburst of ~3m.
A finding cahart can be found in
http://grb.rssi.ru/Swift_558631/Swift_558631_chart.png