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Title: Detailed investigations of the dimmest bursts from two magnetars, SGR J0501+4516 and SGR J1550–5418

We applied the Bayesian blocks representation technique to search for the dimmest bursts from two magnetars: we identified 320 events from SGR J0501+4516 using a deep XMM-Newton observation and 404 bursts from SGR J1550–5418 using two Swift/X-Ray Telescope pointings. The fluence level of our sample for both sources is about one to two orders of magnitude lower than earlier studies. We systematically investigated the morphological characteristics and duration distributions of these bursts, as these properties are directly obtained from their Bayesian blocks profiles. We also studied the spectral behavior of the dimmest bursts, which were grouped based on the morphological types and fluences. Our results helped us further differentiate the spectral nature of very dim bursts from that of the persistent emission, both fitted with physically motivated continuum emission models. Moreover, we generated the differential burst fluence distribution for these two magnetars in the lowest fluence regime.
Authors:
; ;  [1] ;  [2]
  1. Sabancı University, Faculty of Engineering and Natural Sciences, Orhanlı-Tuzla, İstanbul 34956 (Turkey)
  2. Science and Technology Office, ZP12, NASA Marshall Space Flight Center, Huntsville, AL 35812 (United States)
Publication Date:
OSTI Identifier:
22341947
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 778; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMIC X-RAY BURSTS; DISTRIBUTION; EMISSION; NEUTRONS; PULSARS; STARS; TELESCOPES; X RADIATION