[vsnet-grb-info 432] (fwd) GRB 021004

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

From: "B Monard" <BMonard@mweb.co.za>
Subject: GRB 021004
Date: Sat, 5 Oct 2002 12:46:23 +0200

Hi,

last night the centre part of the indicated GRB021004 region / Trigger no
2380, Seq No 5 (20 arcmin diameter field) was imaged at the Bronberg
Observatory using a 32 cm SCT combined with a CCD camera SBIG/ST7-E in
unfiltered mode.

An image was composed by stacking 9 individual images, taken around the time
20021004.809 UT. The size of the image is slightly larger than 17 arcmin in
RA and 12 arcmin in DE.
The limiting magnitude of this image was around 19.5 CR, based on the
USNO-A2.0 R magnitudes. It was visually inspected.

By comparison to the DSS images of generation 1 and generation 2/blue, one
new object brighter than magnitude 19CR was detected at position (2000)
00 26 54.73  +18 55 43.7

Three other possibly new objects were detected near the image limit.
Probably they are image defects. The indicated new object might possibly be
an image defect too.

The following are details of the observation at the Bronberg observatory

Bronberg observatory / CBA Pretoria
observer: Berto Monard  MLF, Pretoria, South Africa
location: -25 º 54' 48", 28º 26' 44"E, altitude 1590m
instrumentation: LX200 12" f/4.2 with ST-7E, unfiltered
conditions: strong wind

The reported CR magnitude results from differential photometry to non-red
comparison stars with R magnitudes from USNO-A2.0.

GRB021004   20021004.809 UT   182CR






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