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J/ApJ/687/1230   SFXTs observed by Swift. I. Outside outbursts   (Sidoli+, 2008)

Monitoring supergiant fast X-ray transients with Swift. I. Behavior outside outbursts. Sidoli L., Romano P., Mangano V., Pellizzoni A., Kennea J.A., Cusumano G., Vercellone S., Paizis A., Burrows D.N., Gehrels N. <Astrophys. J., 687, 1230-1235 (2008)> =2008ApJ...687.1230S (SIMBAD/NED BibCode)
ADC_Keywords: X-ray sources ; Binaries, X-ray Keywords: X-rays: individual (AX J1841.0-0536/IGR J18410-0535, IGR J16479-4514, IGR J17544-2619, XTE J1739-302) Abstract: Supergiant fast X-ray transients (SFXTs) are a new class of high-mass X-ray binaries (HMXBs) discovered thanks to the monitoring of the Galactic plane performed with the INTEGRAL satellite in the last 5 years. To characterize the properties of these sources on timescales of months, we are performing a monitoring campaign with Swift of four SFXTs (IGR J16479-4514, XTE J1739-302, IGR J17544-2619, and AX J1841.0-0536/IGR J18410-0535). We report on the first 4 months of Swift observations, which started on 2007 October 26. We detect low-level X-ray activity in all four SFXTs, which demonstrates that these transient sources accrete matter even outside their outbursts. The X-ray spectra are typically hard, with an average 2-10keV luminosity during this monitoring of about 1033-1034erg/s. We detected pulsations from the pulsar AX J1841.0-0536/IGR J18410-0535, with a period of 4.7008±0.0004s. Description: The results we are reporting here are concentrated on the "out-of-outburst" behavior of the four SFXTs monitored with Swift between 2007 October 26 and 2008 February 28. An old outburst from IGR J16479-4514 observed in 2005 in archival Swift data is also discussed. Table 1 reports the log of the Swift observations. Objects: ---------------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------------- 16 47 59 -45 13.0 IGR J16479-4514 = INTEGRAL1 33 17 54 25.7 -26 19 58 IGR J17544-2619 = 1RXS J175428.3-262035 18 41 00.4 -05 35 46 IGR J18410-0535 = AX J1841.0-0535 17 39 11.6 -30 20 38 XTE J1739-302 = IGR J17391-3021 ---------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 83 66 Observation log
See also: V/106 : Catalogue of X-ray binaries (Liu+ 2001) J/A+A/411/L59 : INTEGRAL reference catalog (Ebisawa+, 2003) J/A+A/448/L9 : Position catalogue of Swift XRT afterglows (Moretti+, 2006) J/PAZh/32/508 : Hard X-ray Bursts by INTEGRAL in 2003-2004 (Chelovekov+, 2006) J/A+A/523/A61 : INTEGRAL all-sky survey of hard X-ray sources (Krivonos+, 2010) J/MNRAS/397/1177 : Swift-XRT rlts of GRBs (Evans+, 2009) J/ApJS/186/378 : Hard X-ray survey from Swift-BAT 2004-2006 (Tueller+, 2010) : Swift X-Ray Telescope (XRT) home page Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 15 A15 --- Name Source name (IGR or XTE) 17- 27 A11 --- Seq Swift sequence identification (1) 29 A1 --- n_Seq [Bcd] observation origin (2) 31- 37 A7 --- Mode Swift Instrument/Mode configuration 39- 48 A10 "YYYY/MM/DD" Start UT date 50- 57 A8 "h:m:s" beg.time Start UT time 59- 68 A10 "YYYY/MM/DD" End UT date 70- 77 A8 "h:m:s" end.time End UT time 79- 83 I5 s Exp ? Net exposure time (3)
Note (1): Archival data unless noted. Note (2): Flag as follows: B = new observation; c = the source triggered Swift/BAT; d = the source was detected with the Swift/BAT hard X-ray transient monitor. Note (3): The exposure time is spread over several snapshots (single continuous pointings at the target) during each observation.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 12-Jan-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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