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Here we present the V and Rc images of the GRB 021004 optical transient
field. White circles mark the position of the OT GRB 021004.
The circle radii are 0.3 arcsec according to astrometrical error.
The optical transient of GRB 021004
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Below is the text of our telegram in
GCN circular
TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 1717
SUBJECT: GRB021004, late time optical observations
DATE: 02/12/02 16:51:59 GMT
FROM: Vladimir Sokolov at SAO RAS
T.A. Fatkhullin, V.N. Komarova, A.V. Moiseev (SAO RAS) report for the
larger GOSH collaboration:
The field of the GRB 021004 optical transient was observed with the
SCORPIO instrument at the 6-m telescope of SAO RAS. The images were
taken starting from 15:30 to 17:45 UT on Nov 29 and from 18.55 to
20.00 UT on Nov 30 under conditions of thin cirrus with seeing of
about 1.2 arcsec in the first night and 1.5 arcsec in the second one.
The V, Rc and Ic filters were used. The absolute astrometry was done
relatively to USNO-B1.0 stars with internal error of 0.3 arcsec.
We detect an object which coincides with the position of the optical
transient (Henden et al. GCN #1592) within the astrometric
error. Photometric calibration was performed using 6 standards
(Henden et al. GCN #1630) in our FOV.
The results of the photometry are given below:
Data Filter Exp. OT mag. Aperture
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29 Nov Rc 15x180s 24.36+/-0.18 3.5 arcsec
29 Nov V 5x450s 24.53+/-0.18 3.5 arcsec
30 Nov Ic 14x120s >23.9
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At this stage it is not clearly whether the object is the pure host
galaxy. Further observations are planned.
Images can be seen at URL:
http://www.sao.ru/hq/grb/followup/GRB021004/GRB021004.html
This message may be cited.
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