TITLE:   GCN CIRCULAR
NUMBER:  2687
SUBJECT: GRB040825A: Optical observations
DATE:    04/09/01 11:46:51 GMT
FROM:    Brian Lindgren Jensen at U.of Copenhagen  <brian_j@astro.ku.dk>

Brian L. Jensen (U. Copenhagen), Arnaud Cassan (IAP, Paris), Dijana
Dominis (U. Potsdam), Jens Hjorth, Johan Fynbo (U. Copenhagen), Michael
I. Andersen (AIP, Potsdam), Javier Gorosabel (IAA-CSIC, Granada) report:

"We report optical observations, covering ~90% of the refined 7'
error-circle (HETE#11553-2) of GRB040825A, taken with the Danish 1.54m
telescope at La Silla (FoV=13.7'), as follows:

Date midobs (UT) | t_b+  | filter:expt | seeing | 3sig limit
------------------------------------------------------------
Aug. 26.30, 2004   14.9h    R:14x600s     ~1.1"     R~23.5
Aug. 26.31, 2004   15.1h    V:12x600s     ~1.4"     V~23.3
Aug. 27.31, 2004   39.1h    R:18x600s     ~1.5"     R~23.0
Aug. 28.28, 2004   62.4h    I:13x300s     ~2.1"     I~21.0

Photometric calibration is based on Henden et al. (GCN#2668).

Visual comparison of the three main epochs reveals no candidate optical
afterglow down to R~23.0"