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 5045

GRB060501: Super-LOTIS observations
2006-05-01T20:22:13Z (18 years ago)
Peter A. Milne at Super-LOTIS <>
P.A.Milne (Steward Obs) reports on behalf of the Super-LOTIS GRB team:

We observed the location of the BAT error circle of the GRB 060501,
as reported in GCN 5040 (Swift trigger 208050; La Parola et
al.,) using the 60cm Super-LOTIS telescope at Kitt Peak, Arizona.
Imaging began at 09:30:30 UT, 1.25 hours after the burst, and consisted
of three series of one-minute exposures in the R filter (12, 23 & 17
images per series, respectively). Seeing was typically 2.7".

A source is detected at the positionreported by Fox and Cenko (GCN 5044) 
in all three summed images created from the individual exposures. 
Using 8 stars from the USNO-B1 catalog, a
single image produced from the first two series led to the following
magnitudes for the suggested counterpart, R1=18.39 +/- 0.11,
R2=18.54 +/- 0.12. However, these magnitudes are very close to the
magnitude of the star 1339-0447675, which is listed at a position
consistent with the optical counterpart position listed by Fox and Cenko.
We therefore suggest that the optical counterpart candidate reported
in GCN 5044 is instead star 1339-0447675 from the USNO-B1.0 catalog.

Analysis of the last series of exposures is on-going.
Looking for U.S. government information and services? Visit