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 9834

GRB 090817: Swift/UVOT Observations of a Possible Late-Time Brightening
2009-08-24T18:58:29Z (15 years ago)
Stephen Holland at USRA/NASA/GSFC/SSC <>
S. T. Holland (CRESST/GSFC/USRA), A. Breeveld (MSSL/UCL), and
W. Baumgartner (GSFC/UMBC) report on behalf of the Swift UVOT team:

      Swift/UVOT observed the USNO-B1.0 source 1341-0096763 (Evans et
al. 2009, GCN Circ. 9819; Rumyantsev et al. 2009, GCN Circ. 9828;
Holland et al. 2009, GCN Circ. 9831), which is located inside the XRT
error circle (Evans et al., 2009, GCN Circ. 9819), at approximately 6
and 7 days after the INTEGRAL trigger (Beckman et al., 2009, GCN
Circ. 9815).  A preliminary examination of the UVOT data yields weak
evidence that the source may have brightened by approximately 0.5 mag
in the UVOT v band between approximately 6.5 and 7.1 days.  Our
observations are consistent with a supernova rising to maximum light.
However, we stress that further observations are needed to confirm
this.  Follow-up photometric and spectroscopic observations of this
source are strongly encouraged.
Looking for U.S. government information and services? Visit