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ATEL # 2846; 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 17 Sep 2010; 21:11 UT
Password Certification: Hans A. Krimm (Hans.Krimm@nasa.gov)
Subjects: X-ray, Binaries, Neutron Stars, Pulsars, Transients
The Swift/BAT hard X-ray transient monitor reports renewed activity in the 15-50 keV band for the transient X-ray pulsar and high mass X-ray binary system XTE J1858+034. Starting on 2010-Sep-14 (MJD 55453), the source has increased in intensity from an undetectable level (one-sigma upper limit of 0.0027 cts/cm2/sec or 12 mcrab) up to a current level of 0.012 ± 0.0038 cts/cm2/sec (50 mcrab) on 2010-Sep-17. This is the highest rate ever seen in the BAT monitor and the first reported outburst of this source since April 2004 (Molkov et al, ATel #274).
BAT Transient Monitor light curve for XTE J1858+034