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MAXI J0655-013: Swift/BAT trigger on new transient

ATel #15443; J. A. Kennea (PSU), C. Gronwall (PSU), K. L. Page (U Leicester), D. M. Palmer (LANL) and A. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels Swift Observatory Team:
on 19 Jun 2022; 18:41 UT
Credential Certification: Jamie A. Kennea (kennea@astro.psu.edu)

Subjects: X-ray, Transient

Referred to by ATel #: 15453, 15495, 15561, 15582

At 20:26:02 UT on June 18, 2022, the Swift Burst Alert Telescope (BAT) triggered on a marginal-significance peak in a 1 minute survey image (trigger=1110865). Swift could not slew to the location due to a Sun angle constraint. The BAT on-board calculated location is RA, Dec 103.793, -1.531 which is
RA(J2000) = 06h 55m 10s
Dec(J2000) = -01d 31' 49"
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). As is usual for an image trigger, the immediately available BAT light curve does not show any significant variation.

Although this trigger was flagged up in GCN #32223 as likely not real, the location matches that of the recently reported MAXI transient MAXI J0655-013 (ATEL #15442). Therefore we conclude that this represents a BAT detection of the new transient, and report here with a more accurate localization.

Due to a Sun observing constraint, Swift cannot observe the BAT position until 17:56 UT on 2022 August 19.