TITLE: GCN CIRCULAR NUMBER: 30081 SUBJECT: GRB 210527A: Swift detection of a burst DATE: 21/05/27 07:22:18 GMT FROM: Kim Page at U.of Leicester S. Laha (GSFC/UMBC/CRESST), P. A. Evans (U Leicester), K. L. Page (U Leicester) and B. Sbarufatti (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: At 07:07:48 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 210527A (trigger=1051453). Swift did not slew immediately due to an observing constraint. The BAT on-board calculated location is RA, Dec 172.355, +31.618 which is RA(J2000) = 11h 29m 25s Dec(J2000) = +31d 37' 06" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). As is normal for an image trigger, the BAT light curve does not show any significant structure. Due to an observing constraint, Swift will not slew until T0+49.6 minutes. There will be no XRT or UVOT data until this time. Burst Advocate for this burst is S. Laha (sib.laha AT gmail.com). 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/)