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

SGUERA, VITOVITOSGUERASIDOLI, LaraLaraSIDOLIPAIZIS, ADAMANTIAADAMANTIAPAIZISBird, A. J.A. J.Bird2020-05-042020-05-0420160035-8711http://hdl.handle.net/20.500.12386/24447We 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 (∼15 and 30 min, respectively), peak flux (∼10-9 erg cm-2 s-1) and dynamic range (∼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.STAMPAenDiscovery of two new fast X-ray transients with INTEGRAL: IGR J03346+4414 and IGR J20344+3913Article10.1093/mnras/stw21832-s2.0-85015005980000393566000046https://academic.oup.com/mnras/article/463/3/2885/26465932016MNRAS.463.2885SFIS/05 - ASTRONOMIA E ASTROFISICA