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 18070

Swift 650221/IGR J00291+5934: Liverpool Telescope observations
2015-07-26T06:55:38Z (9 years ago)
Drejc Kopac at Math Phys U,Slovenia <>
D. Kopac (U Ljubljana), C. Guidorzi (U Ferrara), C.G. Mundell (U Bath), 
I.A. Steele (LJMU), A. Gomboc (U Ljubljana), on behalf of a large 
collaboration report:

The 2-m Liverpool Telescope automatically began observing Swift Trigger 
650221/IGR J00291+5934 (Barthelmy et al., GCN 18061) with RINGO3 
polarimeter, starting 5 minutes post BAT trigger. Observations continued 
for 2 hours. At the position consistent with Fox & Kulkarni 2004 (ATel 
#354), and D'Avanzo et al. 2007 (A&A, 472, 881), we clearly detect the 
optical counterpart. The estimated magnitude is R = 18.07 +- 0.03 at 
36.4 minutes post trigger, calibrated against nearby USNO-B1.0 stars.
Looking for U.S. government information and services? Visit