Swift follow-up of the renewed activity of IGR J19294+1816

L. Sidoli*, S. P. Drave, M. Fiocchi, A. Bazzano, V. Sguera, J. Chenevez, A. J. Bird, E. Kuulkers, L. Natalucci, A. Tarana

*Corresponding author for this work

Research output: Other contributionNet publication - Internet publicationResearch

Abstract

Following the renewed activity of the X-ray transient pulsar IGRJ19294+1816 observed by INTEGRAL (ATel #4135), Swift pointed at the source position for about 2 ks starting on 2012 May 28 at 17:45:15 UT. The source displayed a net count rate of 0.18 +/- 0.01 c/s (2-10 keV, XRT PC data).

The XRT spectrum (PC data, net exposure time of 1968 s) is well described by an absorbed power law model, resulting in a photon index of 1.25 (+0.77,-0.68), and in an absorption of NH= 8 (+/-4) E+22 cm-2 (chi2_red=0.600 for 11 dof). The source fluxes are 3E-11 erg/cm2/s (1-10 keV, observed) and 5E-11 erg/cm2/s (1-10 keV, unabsorbed), indicating a declining phase with respect to the INTEGRAL observation. A black body model results in an equally good fit to the data, with NH= 4 (+/-3) E+22 cm-2 and a temperature of 2.0 (+0.7,-0.4) keV (chi2_red=0.633 for 11 dof).

A timing analysis on the barycentered events clearly shows X-ray pulsations with a period of P=12.457 +/- 0.006 s and a pulse fraction of about 60%.

We would like to thank the Swift Team for making these observations possible.
Original languageEnglish
Publication date30 May 2012
Publication statusPublished - 30 May 2012
SeriesThe Astronomer's telegram
NumberATel #4136

Keywords

  • X-ray
  • Gamma ray
  • Binary
  • Neutron star
  • Transient
  • Pulsar

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