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The Swift/BAT Hard X-Ray Transient Monitor

Krimm, H. A. and Holland, S. T. and Corbet, R. H. D. and Pearlman, A. B. and Romano, P. and Kennea, J. A. and Bloom, J. S. and Barthelmy, S. D. and Baumgartner, W. H. and Cummings, J. R. and Gehrels, N. and Lien, A. Y. and Markwardt, C. B and Palmer, D. M. and Sakamoto, T. and Stamatikos, M. and Ukwatta, T. N. (2013) The Swift/BAT Hard X-Ray Transient Monitor. Astrophysical Journal Supplement Series, 209 (1). Art. No. 14. ISSN 0067-0049.

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The Swift/Burst Alert Telescope (BAT) hard X-ray transient monitor provides near real-time coverage of the X-ray sky in the energy range 15-50 keV. The BAT observes 88% of the sky each day with a detection sensitivity of 5.3 mCrab for a full-day observation and a time resolution as fine as 64 s. The three main purposes of the monitor are (1) the discovery of new transient X-ray sources, (2) the detection of outbursts or other changes in the flux of known X-ray sources, and (3) the generation of light curves of more than 900 sources spanning over eight years. The primary interface for the BAT transient monitor is a public Web site. Between 2005 February 12 and 2013 April 30, 245 sources have been detected in the monitor, 146 of them persistent and 99 detected only in outburst. Among these sources, 17 were previously unknown and were discovered in the transient monitor. In this paper, we discuss the methodology and the data processing and filtering for the BAT transient monitor and review its sensitivity and exposure. We provide a summary of the source detections and classify them according to the variability of their light curves. Finally, we review all new BAT monitor discoveries. For the new sources that are previously unpublished, we present basic data analysis and interpretations.

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Additional Information:© 2013 American Astronomical Society. Received 2013 May 10; accepted 2013 August 30; published 2013 October 25. The Swift/BAT transient monitor is supported by NASA under Swift Guest Observer grants NNX09AU85G, NNX12AD32G, NNX12AE57G, and NNX13AC75G. H.A.K. also acknowledges these NASA grants for partial support. P.R. acknowledges ASI-INAF grant 1/004/11/0. We gratefully acknowledge the RXTE and Swift principal investigators for approving, and mission planners for scheduling, themany observations discussed in this work. This research has made use of data obtained from the High Energy Astrophysics Science Archive Research Center (HEASARC), provided by NASA’s Goddard Space Flight Center and from the UK Swift Science Data Centre at the University of Leicester. This research has also made use of the SIMBAD database, operated at CDS, Strasbourg, France. Finally, the authors acknowledge helpful comments from an anonymous referee.
Funding AgencyGrant Number
NASA Swift Guest ObserverNNX09AU85G
NASA Swift Guest ObserverNNX12AD32G
NASA Swift Guest ObserverNNX12AE57G
NASA Swift Guest ObserverNNX13AC75G
Subject Keywords: black hole physics; pulsars: general; surveys; X-rays: binaries; X-rays: general
Issue or Number:1
Record Number:CaltechAUTHORS:20131205-100649547
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Official Citation:The Swift/BAT Hard X-Ray Transient Monitor H. A. Krimm et al. 2013 ApJS 209 14
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42855
Deposited By: Ruth Sustaita
Deposited On:05 Dec 2013 18:30
Last Modified:03 Oct 2019 06:02

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