TITLE: GCN CIRCULAR NUMBER: 43479 SUBJECT: GRB 260120B: Swift detection of a burst DATE: 26/01/20 18:16:31 GMT FROM: K.L. Page at U Leicester <klp5@leicester.ac.uk> M. Ferro (INAF-OAB), R. Gupta (NASA GSFC), A. Y. Lien (U Tampa), K. L. Page (U Leicester), D. M. Palmer (LANL) and M. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: At 18:00:26 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 260120B (trigger=1442454). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 284.666, +61.912 which is RA(J2000) = 18h 58m 40s Dec(J2000) = +61d 54' 42" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a duration of about 10 sec. The peak count rate was ~1700 counts/sec (15-350 keV), at ~1 sec after the trigger. The XRT began observing the field at 18:02:51.6 UT, 145.5 seconds after the BAT trigger. No source was detected in the 2.5-s promptly available image. We are waiting for the full dataset to detect and localise the XRT counterpart. No UVOT data are available at this time. Burst Advocate for this burst is M. Ferro (matteo.ferro AT inaf.it). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/) View this GCN Circular online at https://gcn.nasa.gov/circulars/43479. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...