GCN Circular 3198
Subject
GRB 050408: First Optical observations with TFOSC at the RTT150
Date
2005-04-09T02:08:11Z (20 years ago)
From
Irek Khamitov at TUG <irekk@tug.tug.tubitak.gov.tr>
Z. Aslan,I. Khamitov,T. Ozisik, K. Uluc(TUG), U. Kiziloglu (METU),I.
Bikmaev, R. Gumerov, N. Sakhibullin (KSU/AST), A. Alpar (SabUni), R.
Burenin, M. Pavlinsky, R. Sunyaev (IKI),
report:
We have observed the error box of GRB 050408(GCN 3189 and GCN 3191)
with TFOSC (the imaging and spectroscopic camera of the TUBITAK National
Observatory, Turkey) attached to the Russian-Turkish 1.5-m telescope
(Bakyrlytepe, Turkey). We made series of 30s and 60s exposures in Rc,
starting at 18:46 UT. We have found the OT candidate indicated in GCN 3193
getting fainter with a spectral index of -0.63. We have determined its
postion and magnitudes using USNO-B1. The position and the preliminary R
photometry are as follows:
RA: 12:02:17.31 Dec: +10:51:9.4 (+/- 0.1 arcsec)(2000)
T-T0(hours) Rc
3.7 20.94 +/- 0.1
4.4 21.05
5.4 21.17
6.7 21.31
8.3 21.50
The reductions are in progress.
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