Swift reports the detection of a new galactic transient source Swift J1858.6-0814
ATel #12151; H. A. Krimm (NSF/USRA), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL)
on 31 Oct 2018; 22:53 UT
Credential Certification: Hans A. Krimm (hkrimm@nsf.gov)
Subjects: X-ray, Binary, Black Hole, Neutron Star, Transient
Referred to by ATel #: 12158, 12160, 12163, 12164, 12167, 12180, 12184, 12186, 12197, 12220, 12499, 12512, 12704, 12881, 13255, 13455, 13536, 13563, 13719, 13725
The hard X-ray transient monitor of the Swift Burst Alert Telescope (BAT) has detected a previously unknown transient source. The new source, Swift J1858.6-0814, was first detected by the BAT in a 1-day integration on 2018 October 25 (MJD 58416) at an average rate of 0.0056 +/- 0.0013 counts/sec/cm2 (25 mCrab) in the 15-50 keV band. It has risen in brightness since that time. On 2018 October 31, the rate was 0.0094 +/- 0.0024 counts/sec/cm2 (43 mCrab).
The best BAT position is (J2000):
RA = 284.673 Dec= -8.245
RA = 18 58 41.5 Dec = -08 14 42.0
with an estimated error of 3 arc minutes (statistical plus systematic). This corresponds to galactic coordinates L=26.395, B=-5.351. Given the proximity to the galactic plane, we tentatively identify this source as a galactic X-ray transient.
Swift Target of Opportunity observations have been requested.
Swift/BAT Transient Monitor observations of Swift J1858.6-0814
