Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 1515

GRB 020812: early time optical observation at Ouda Station
2002-08-21T05:13:06Z (22 years ago)
Taichi Kato at Kyoto U <>
H. Ohashi, T. Kato, T. Senda, H. Mii, K. Mizuno, Y. Yasaka (Kyoto U)
and H. Yamaoka (Kyushu U) report on behalf of VSNET-grb collaboration:

  "We have performed a full analysis of the R band images of GRB 020812
field taken at Ouda (GCN 1469).  Three fields of view (14 arcminutes
square) were observed, each of which covered a part of HETE WXM error
box (GCN 1468) (
The limiting magnitudes are measured by compareing with USNO-A2.0 red
magnitudes.  "Coverage" shows the percentage of covered area of the
HETE WXM error box.

FOV	   1		   2		   3
center	 20:38:28.8	20:38:21.0	20:38:53.3	R.A.
(J2000) -05:17:58	-05:17:24	-05:23:45	Dec.
epoch	 11:08-12:03	12:05-13:27	13:34-16:59	Aug. 12 UT + 
exp.	 38		73		156		minutes
lim.mag  18.9		20.2		21.2		in R
coverage 48%		30%		58%		
remark	 twilight

  By the comparison with DSS 2 red image, no new source brighter than
the limit of DSS 2 is detected.

This message may be cited.
Looking for U.S. government information and services? Visit