GCN Circular 9320
Subject
GRB 090424: optical observations
Event
Date
2009-05-04T00:21:25Z (17 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
V. Rumyantsev, K. Antoniuk (CrAO), A. Pozanenko (IKI) report on behalf of
larger GRB follow-up collaboration:
We observed the afterglow (Cannizzo et al. GCN 9223; Yuan GCN 9224) of the
Swift GRB 090424 (Trigger 350311; Cannizzo et al., GCN 9223) in R filter on
Apr. 24 (18:25:36 -- 19:23:38) and Apr. 26 (19:57:14 -- 21:01:01) with
AZT-11 telescope of CrAO. We detect the afterglow in combined images of
both epochs. Astrometry of the afterglow is RA(J2000): 12 38 05.1
Dec(J2000): +16 50 14.72 with uncertainty of 0.5 arcsec.
Preliminary photometry of combined images is based on USNO-B1.0
1068-0228255 star RA=12:38:02.33 Dec=+16:51:10.0 is following:
T0+ Filter, Exposure, mag., err.
(d) (s)
0.1972 R 20x180 19.27 +/-0.06
2.2628 R 20x180 21.0 +/-0.2
The photometry is contaminated with possible host galaxy (Evans et al. GCN
9226).
The combined image of the Apr. 24 observation can de found at
http://grb.rssi.ru/GRB090424/GRB090424_AZT-11_R.gif