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Swift/BAT confirms the outburst of Swift J1756.9-2508

ATel #11505; 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) (i. e. the Swift-BAT team)
on 5 Apr 2018; 21:25 UT
Credential Certification: Hans A. Krimm (hkrimm@nsf.gov)

Subjects: X-ray, Binary, Transient, Pulsar

Referred to by ATel #: 11523, 11566, 11581, 11603

The Swift/BAT transient monitor confirms the current outburst from the accreting millisecond pulsar, Swift J1756.9-2508 (Mereminskiy et al., ATel #11497; Bult et al., ATel #11502). In the BAT 15-50 keV energy band, the outburst began on 29 March 2018 (MJD 58206) and peaked on 1 April 2018, when the flux reached 0.013 +/- 0.002 ct s-1 cm-2 or ~60 mCrab. The outburst began to decline by 3 April 2018, reaching 0.005 +/- 0.003 ct s-1 cm-2 (~23 mCrab) by 5 April 2018. The peak rate and duration (assuming that the outburst is indeed in its final decline) are comparable to the peak rates and durations the outbursts of 2007 (Krimm et al, 2007, ApJ,688,147) and 2009 (Patruno et al., ATel #2130). There have been no confirmed outbursts since 2009.

Swift/BAT Transient Monitor observations of Swift J1756.9-2508