Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
Introducing Einstein Probe, Astro Flavored Markdown, and Notices Schema v4.0.0. See news and announcements

GCN Circular 973

GRB010222: Optical decay slope
2001-02-23T01:23:59Z (23 years ago)
Paul Price at RSAA, ANU at CIT <>
P.A. Price (Caltech), A. Gal-Yam, E. Ofek (Wise Observatory), S. Yost,
J.S. Bloom, T.J. Galama F. Harrison and S.R. Kulkarni (Caltech) report on
behalf of a larger collaboration:

"A. Gal-Yam and E. Ofek have observed the optical afterglow of GRB 010222
(GCN #961, #962) with the Wise 1-metre telescope in R-band at Feb 22.95 UT.
Preliminary photometry on the unflattened images against comparison star
`A' of Henden (GCN #967) yields a magnitude of R = 19.623 +/- 0.12 mag.
When combined with the data from Henden (GCN #967), we derive a temporal
decay slope of alpha = 0.89 +/- 0.09.
The results of the proper reduction will follow later.  We report this
now in order to assist those preparing observations."

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