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 6746

GRB070810B: Optical observations with KANATA
2007-08-10T17:34:52Z (17 years ago)
Makoto Uemura at Hiroshima U <>
M. Uemura, A. Arai, O. Nagae, and T. Uehara (Hiroshima Univ.),
report on behalf of the KANATA GRB team:

  We started optical imaging of the field of GRB070810B (GCN 6743) 
at 15:22:37 UT 10 Aug. using TRISPEC attached to the KANATA 
1.5-m telescope at Higashi-Hiroshima Observatory, Japan.  
Exposure times are 30 sec for the first 10 frames, then changed 
to 123 sec for late frames.  

We have performed preliminary analysis for the first 30-min images.
No new bright object was detected.  There is no object showing
significant fadings. 
Limit magnitudes are estimated from neighbour USNO A2.0 stars as 

10 Aug. UT  limit mag.  band
15:33:22    20.8        Rc
15:55:04    20.9        Rc

We note that there is a possible minor planet at RA=00:35:59.3, 
Dec=+08:50:15 (time=15:33:22 UT).  The object is about Rc=20.1,
and moving northward during our observations.
Looking for U.S. government information and services? Visit