TITLE:   GCN CIRCULAR
NUMBER:  28919
SUBJECT: Trigger 1007266: Swift detection of 1A 0535+262
DATE:    20/11/18 07:41:09 GMT
FROM:    David Palmer at LANL  <palmer@lanl.gov>

M. G. Bernardini (INAF-OAB), P. D'Avanzo (INAF-OAB),
N. J. Klingler (PSU), K. L. Page (U Leicester), T. Sbarrato (INAF-OAB)
and A. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels
Swift Observatory Team:

At 07:08:05 UT, the Swift Burst Alert Telescope (BAT) triggered and
located 1A 0535+262 (trigger=1007266). Swift did not slew to the location
due to higher priority for the pre-planned target. 
The BAT on-board calculated location is 
RA, Dec 84.721, +26.327 which is 
   RA(J2000) = 05h 38m 53s
   Dec(J2000) = +26d 19' 36"
with an uncertainty of 3 arcmin (radius, 90% containment, including 
systematic uncertainty). 

This trigger was due to the current very bright outburst of
this object (>7 Crab at times) combined with technical effects
from yesterday's Star Tracker Loss-of-Lock misidentification.