Discovery of two new fast X-ray transients with INTEGRAL: IGR J03346+4414 and IGR J20344+3913

作者：Sguera V^*; Sidoli L; Paizis A; Bird A J

来源：Monthly Notices of the Royal Astronomical Society, 2016, 463(3): 2885-2892.

DOI：10.1093/mnras/stw2183

• X-rays: individual: IGR J03346+4414
• X-rays: individual: IGR J20344+3913

We report on the discovery of two fast X-ray transients (FXTs) from analysis of archival INTEGRAL data. Both are characterized by a remarkable hard X-ray activity above 20 keV, in terms of duration (similar to 15 and 30 min, respectively), peak flux (similar to 10(-9) erg cm(-2) s(-1)) and dynamic range (similar to 2400 and 1360, respectively). Swift/X-ray telescope follow-up observations failed to detect any quiescent or low-level soft X-ray emission from either of the two FXTs, providing an upper limit of the order of a few times 10(-12) erg cm(-2) s(-1). The main spectral and temporal Imager on Board INTEGRAL Satellite (IBIS)/INTEGRAL Soft Gamma-Ray Imager (ISGRI) characteristics are presented and discussed with the aim of inferring possible hints on their nature.

• 出版日期2016-12