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Swift/BAT detects renewed hard X-ray activity from XTE J1946+274

ATEL # 2663; H. A. Krimm (CRESST/GSFC/USRA), S. D. Barthelmy (GSFC), W. Baumgartner (CRESST/GSFC/UMBC), J. Cummings (CRESST/GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), C. B. Markwardt (CRESST/GSFC/UMD), D. Palmer (LANL), T. Sakamoto (CRESTT/GSFC/UMBC), G. Skinner (CRESST/GSFC/UMD), M. Stamatikos (OSU/GSFC), J. Tueller (GSFC), T. Ukwatta (GSFC/GWU)
on 7 Jun 2010; 18:27 UT
Password Certification: Hans A. Krimm (

Subjects: X-ray, Binaries, Neutron Stars, Pulsars, Transients
Referred to by ATEL #: 2677, 2692, 2847, 3048, 3077

The Swift/BAT hard X-ray transient monitor reports renewed activity in the 15-50 keV band for the transient pulsar and Be/X-ray binary XTE J1946+274 (GRO J1944+26). The pulsar has a known pulse period of 15.8 sec. Starting on 2010-June-04 (MJD 55351), the source has increased in intensity from an undetectable level (one-sigma upper limit of 0.0011 cts/cm2/sec or 5 mcrab) up to a current level of 0.0086 0.0017 cts/cm2/sec (40 mcrab) on 2010-Jun-07. This is the highest rate ever seen in the BAT monitor and the first reported outburst of this source since July 2001 (Wilson et al, 2003, ApJ 584:996).

Scaled Map Transient Analysis for XTE J1946+274

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R. E. Rutledge , Editor
ATEL Mirror v1.0 Updates