Skip to main content
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