GCN Circular 2802
Subject
GRB041006: Optical observations and Potential host galaxy
Date
2004-10-14T10:17:18Z (20 years ago)
From
Johan U. Fynbo at U.Copenhagen <jfynbo@astro.ku.dk>
J. P. U. Fynbo, B. L. Jensen, K. Pedersen, D. Watson, P. Jakobsson,
G. Bjornsson, J. M. Castro Cer�n, H. Pedersen, J. Hjorth
(U. Copenhagen), D. Zucker (MPIA) and T. Pursimo (NOT) report:
"We have observed the field of GRB 041006 (Galassi et al., GCN #2770)
at two epochs with the 2.56m Nordic Optical Telescope using the
MOSCA instrument (R-band). At the position of the afterglow (Costa et
al., GCN #2735), we detect the following:
Date (UT 2004) | t_b+ | exptime | Seeing | mag.
------------------------------------------------------------
Oct. 06.96 10.8h 300s+3x600s ~0.8" R~20.5
Oct. 11.18 112.2h 5x600s ~1.9" R~23.6
The photometry is relative to the magnitude of a nearby star
as measured by Henden (GCN #2801). The source is clearly extended in
the 2nd epoch image (although the seeing was poor), so the potential
host galaxy is most likely contributing most of the flux.
A section of the 2nd epoch image can be seen at
http://www.astro.ku.dk/~brian_j/grb/grb041006 ."