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TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 2220
SUBJECT: GRB030329: RTT150 optical observations
DATE: 03/05/09 14:50:05 GMT
FROM: Irek Khamitov at TUG <irekk@tug.tug.tubitak.gov.tr>
I.Bikmaev (KSU), I. Khamitov (TUG);
N. Sakhibullin, V. Suleymanov (KSU);
R. Burenin, R. Sunyaev, D. Denissenko, M. Pavlinsky, O. Terekhov, A.
Tkachenko, M.Gilfanov (IKI);
Z. Aslan, O.Golbasi (TUG);
U. Kiziloglu, A. Alpar, A. Baykal (METU);
report:
We continue observations of the GRB 030329 optical afterglow (Peterson
and Price, GCN 1985) with the 1.5-m Russian-Turkish Telescope RTT150
at TUG. During the nights of May 3,4,7, 2003, series of 5 and 15 min
exposures with V-filter have been obtained under good photometric
conditions and average seeing of 1.3 arcsec. ANDOR TE 2048 x 2048 CCD has
been used as the detector.
Results of OT our photometry (based on Henden's list, GCN 2082 ), averaged
over for each night, are as follow:
Midtime Vmag Verr Total Exp. sec
03.86UT 21.40 0.07 10200
04.86UT 21.33 0.07 11400
07.86UT 21.60 0.08 9300
Additional note:
Probably, a moved object was found in the vicinity of the OT. This object
was labeled as "O2" in Zharikov et al. (GCN 2171) and as "A" in Blake and
Bloom (GCN 2011).
We integrated all the three night observations into one image and
estimated the magnitudes of the sources in the afterglow vicinity as
V Verr
O1 (B) 23.0 0.2
O2 (A) 22.6 0.1
Using the coordinates of the reference stars from Henden's list we have
determined the positions of OT and O1, O2 as
RA(2000.0) DEC(2000.0)
OT 10:44:49.958 21:31:17.50
O1 10:44:50.039 21:31:10.86
O2 10:44:49.373 21:31:15.02
The comparision of coordinates with those given by Blake and Bloom has
shown that position of the source "A" is different by 6 arcsec while the
the position of the source "B" is in agreement within 0.5 arcsec
positional error of Blake and Bloom.
We estimate the color of O2 as V-R = 0.2, and of O1 as V-R = 0.9
(R mag estimates are taken from Khamitov et al., GCN 2198)
Taking into account the apparent magnitudes, color and considerable
positional shift, we suppose that this is an object nearer to the Sun.
Additional observations are encouraged.
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