GCN Circular 4652
Subject
GRB 060203: RTT150 optical observations
Date
2006-02-04T07:39:42Z (18 years ago)
From
Irek Khamitov at TUG <irekk@tug.tug.tubitak.gov.tr>
I. Bikmaev, A.Galeev, N. Sakhibullin (KSU/AST)
I. Khamitov, Z. Aslan (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.),
R. Burenin, M. Pavlinsky, R. Sunyaev (IKI)
report:
The field of XRT position of GRB 060203 (Swift BAT Trigger 180151,
Retter et al., GCN 4641, GCN 4644) was observed with Russian-Turkish
1.5-m telescope (RTT150, Bakyrlytepe, TUBITAK National Observatory,
Turkey) by using Andor CCD.
We made series of 30 sec exposures in Rc and V filters, and series
of 60 sec exposures in B-filter on February 04, 00:20 - 03:50 UT.
We confirm the presence of the fading optical transient found by
Malesani et al. (GCN 4645) and Genko et al. (GCN 4646) and
estimate its magnitudes (relative to R = 18.1, V = 18.7, and B = 19.6
of nearby USNO star U1575_02633321) on our co-added frames as follows:
Rc = 19.9 +-0.1 UT(mean) = 00:49 ( 54 min after the burst)
V = 22.3 +-0.3 UT(mean) = 01:33 ( 98 min )
B > 23 UT(mean) = 02:07 ( 2h 12 min)
Rc = 21.0 +-0.1 UT(mean) = 02:49 ( 2h 54 min)
V > 22.5 UT(mean) = 03:05 ( 3h 10 min)
By using our and published R magnitudes the estimated
power law decay slope is -0.90+/-0.04
(http://www.tug.tubitak.gov.tr/~irekk/grb/grb060203/grb060203.jpg)
The red spectrum of OT is supporting also by IR data of Bloom et al. (GCN 4648).
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