GCN Circular 22706
Subject
Swift trigger 831888: misidentification of 4U 1416-62
Date
2018-05-11T18:59:18Z (7 years ago)
From
Amy Lien at GSFC <amy.y.lien@nasa.gov>
A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC),
B. Sbarufatti (PSU), and A. Tohuvavohu (PSU)
report on behalf of the Swift Team:
Further ground analysis shows that the BAT trigger #831888
(Tohuvavohu et al. GCN Circ. 22699) was due to misidentification
of 4U 1416-62 (a.k.a. 2S 1417-624 and H 1417-624).
The misidentification was caused by a known race condition in the
Swift/BAT software, which leads to incorrect spacecraft attitude
information to be applied to a known source.
4U 1416-62 is currently undergoing a giant outburst, which is detected
by MAXI (Nakajima et al. ATel #11479) and the BAT transient monitor
(Krimm et al. ATel #11569).
The known X-ray source 1RXS J141805.9-621902, detected in the
XRT field of view at a flux level of 1.41+/-0.2 E-12 erg/cm^2/s, is
unrelated to BAT the trigger.
We apologize for any inconvenience.