GCN Circular 5184
Subject
GRB060502b: optical observations
Event
Date
2006-05-29T10:02:37Z (20 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
V.Rumyantsev (CrAO), R. Karimov (MAO), R. Salyamov (MAO), E. Pavlenko
(CrAO), Yu. Efimov (CrAO), A. Pozanenko (IKI), M. Ibrahimov (MAO) on behalf
of larger GRB follow up collaboration report:
We observed the location of Swift short GRB060502B (Troja et al., GCNs 5055,
5059, 5063, 5093) in the R band with 1.5m telescope of Maidanak Astronomical
Observatory (MAO) starting on May 02 22:43 (UT) (5.3 hours after the
trigger) and Shajn 2.6m telescope of CrAO between May 03 (UT) 01:27 - 02:41
(8.6 hours after the trigger). Totally we obtained 6 images of 180 sec
exposure with mean seeing ~0.95" in Maidanak 1.5m and 39 images of 60 sec
exposure in CrAO observatory (seeing ~3"). In combined images we detect G1
galaxy mentioned by Berger et al. (GCN 5071) and Halpern et al. (GCN 5072)
and do not detect S2 source (Price et al. GCN 5077). A photometry of G1 and
S1 sources is based on USNO B1.0 star R=17.5 mag (USNO-B1 426-035230 RA,
Dec = 278.92572,52.61611):
Mid time Telescope Exp. G1 S1 Limiting (UT)
sec mag mag mag
May 02.954 MAO 1.5m 6�180 ~24.2 21.40 +/-0.10 23.6
May 03.086 CrAO 2.6m 39x60 23.7 +/-0.3 21.65 +/-0.05 24.1
Our brightness estimation of G1 is consistent with brightness estimations
obtained in MDM 1.3 (T0+15 h) R~23.9 (Halpern et al. GCN5072) and in
Gemini North (T0+17 h) R~23.8 (Price et al. GCN5077).
The combined images can be found in http://grb.rssi.ru/GRB060502b
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