Skip to main content
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 5771

GRB 061028: MDM Observations
2006-10-29T22:15:52Z (18 years ago)
Nestor Mirabal at Columbia U <>
N. Mirabal (Columbia U.), R. J. Assef &  K. Schlesinger (OSU) report on
behalf of the MDM Observatory GRB follow-up team:

"We observed the Swift error circle of GRB 061028 (Sakamoto et al., GCN 
in r', i', and z' bands using the RETROCAM imager on the MDM 2.4m
telescope starting on October 28 06:47 UT, 5.35 hours after the trigger.
A summed 45-minute exposure in i' reveals no new object in the refined
XRT error circle (Cusumano et al., GCN 5767) down to I ~ 21.5 relative
to the USNO-B1.0 catalog. We clearly detect sources S1 (Bloom et al.,
GCN 5768) and S2 (Cenko et al., GCN 5770)  at a preliminary magnitude of
I ~ 21.0 for both objects, consistent with the measurements reported by
Cenko et al (GCN 5770).  Results of additional bands will be reported

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