GCN Circular 4371
Subject
GRB 051221: No variability in Gemini data
Event
Date
2005-12-21T08:18:37Z (20 years ago)
From
Edo Berger at Carnegie Obs <eberger@ociw.edu>
E. Berger (Carnegie Observatories) reports:
"Further analysis of the Gemini GMOS data reveals that the object located
within the XRT error circle (GCNs 4367-9) has not changed in brightness
between 227 and 271 min after the burst to a limit of about 0.05 mag in
comparison to several nearby stars. We note that a typical decay rate of
t^-1 would result in a change of about 0.2 mag. The lack of variability
suggests that this is either the host galaxy or an unrelated object, or
that the decay rate is unusually shallow, |alpha|<0.25."