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GCN Circular 743

GRB000630, optical observations
2000-07-02T00:40:28Z (23 years ago)
Jochen Greiner at Astrophys.Inst. Potsdam,Germany <>
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.
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