[AAVSO-HEN] GRB041006: Optical observations and Potential host galaxy

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
For an archive and more information on circulars visit:
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TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  2802
SUBJECT: GRB041006: Optical observations and Potential host galaxy
DATE:    04/10/14 10:17:18 GMT
FROM:    Johan U. Fynbo at U.Copenhagen  <jfynbo at astro.ku.dk>

J. P. U. Fynbo, B. L. Jensen, K. Pedersen, D. Watson, P. Jakobsson, 
G. Bjornsson, J. M. Castro Cerón, 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 ."