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28 March 2024
 
  » arxiv » astro-ph/0310555

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A Search for X-Ray Flashes with XMM-Newton
N.M. Law ; R.E. Rutledge ; S.R. Kulkarni ;
Date 20 Oct 2003
Journal Mon.Not.Roy.Astron.Soc. 350 (2004) 1079
Subject astro-ph
Affiliation1 and 2), R.E. Rutledge , S.R. Kulkarni ( IOA Cambridge, Caltech
AbstractWe searched for X-ray flashes (XRFs) -- which we defined as ~10s duration transient X-ray events observable in the 0.4-15 keV passband -- in fields observed using XMM-Newton with the EPIC/pn detector. While we find two non-Poissonian events, the astrophysical nature of the events is not confirmed in fully simultaneous observations with the EPIC/MOS detectors, and we conclude that the events are anomalous to the EPIC/pn detector. We find a 90% upper limit on the number of flashes per sky per year at two different incoming flash fluxes: 4.0x10^9 events / sky / year for a flux of 7.1x10^-13 erg / cm^2 / s and 6.8x10^7 events / sky / year for 1.4x10^-11 erg / cm^2 / s. These limits are consistent with an extrapolation from the BeppoSAX/WFC XRF rate at much higher fluxes (about a factor of 10^5), assuming an homogenous population, and with a previous, more stringent limit derived from ROSAT pointed observations.
Source arXiv, astro-ph/0310555
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