GCN Circular 743
Subject
GRB000630, optical observations
Date
2000-07-02T00:40:28Z (24 years ago)
From
Jochen Greiner at Astrophys.Inst. Potsdam,Germany <jgreiner@aip.de>
J. Greiner (AIP, Potsdam),
A. Henden (USRA/USNO), on behalf of the USNO GRB team,
S. Merlino, J. Masegosa (IAA-CSIC Granada), Felipe Hoyo (CAHA, Almeria),
A.J. Castro-Tirado (LAEFF-INTA, Madrid, and IAA-CSIC, Granada),
S. Klose (Thueringer Landessternwarte, Tautenburg),
J. Gorosabel (DSRI, Copenhagen)
report on behalf of a larger collaboration:
R-band images of the GRB 000630 error box (Hurley et al., GCN #736) were
acquired according to the following table (note that the USNOFS
observations were made on two field centers, covering 100% of the error box):
Date (UT; Start) Telescope Exp.(s) Coverage Seeing Lim. Mag.
------------------------------------------------------------------------
0006 30.865 Calar Alto 2.2m 2*600 90% 1.4" 23.0
0007 1.181 USNOFS 1.0m 4*600 60% south 1.9" 22.5
0007 1.181 USNOFS 1.0m 4*600 60% north 1.9" 22.5
0007 1.292 USNOFS 1.0m 6*600 60% south 2.2" 22.5
0007 1.292 USNOFS 1.0m 4*600 60% north 2.2" 22.5
0007 1.894 Calar Alto 2.2m 2*900 100% 1.3" 24.0
------------------------------------------------------------------------
Photometric calibration was achieved with preliminary BVRcIc all-sky
photometry for the field of GRB000630 (Henden, GCN #742).
Comparison between these four epoch observations did not reveal any object
brighter than R ~ 22.5 mag showing variability larger than 0.3 mag.
We confirm the findings of Jensen et al. (GCN #739) on the Bartolini et al.
(GCN #737) object which appears constant in our images. We also do not
find any object at the radio source position reported by Berger et al.
(GCN #738) down to R = 23.5 mag.