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SUMMARY:Duration distributions for gamma-ray bursts registered in various 
 experiments since WIND/KONUS- up to Fermi/GBM
DTSTART;VALUE=DATE-TIME:20151008T111500Z
DTEND;VALUE=DATE-TIME:20151008T113000Z
DTSTAMP;VALUE=DATE-TIME:20260613T000555Z
UID:indico-contribution-387@cern.ch
DESCRIPTION:Speakers: Irene ARKHANGELSKAJA (National Research Nuclear Univ
 ersity MEPhI (Moscow Engineering Physics Institute))\nGamma-ray bursts  du
 ration distributions properties for events registered by experiments SMM/G
 RS\, CGRO/BATSE\, HETE2\, WIND/KONUS\, KONUS-WIND/VENERA 13 or 14\, GRANAT
 /PHEBUS\, GRANAT/SIGMA\, Swift/BAT\, RHESSI\, ULYSSES\, GRANAT/WATCH\, Fer
 mi/GBM are considered. GRBs observed since 1967 and now several thousends 
 of events were listed in more than 15 catalogues. \nGamma-ray bursts durat
 ion distribution was the first analysed using data of BATSE instrument onb
 oard the CGRO. Bursts duration was described by the time intervals in whic
 h the integrated counts from the burst increases from 25% to 75% (t50 ) an
 d from 5% to 95% (t90). The GRBs duration distribution analysis had shown 
 the existence of two bursts classes: long (t90 more than 2 s) and short (t
 90 less than 2 s). But results of similar distributions for bursrs observe
 d by other detectors have shown shifting of boundary between short and lon
 g events from value of 2 s.  For example\, Swift/BAT GRBs subset analysis 
 give the value of ~1 s for this separator point. Moreover\,  t90 has depen
 dence from instrument registered this burst – it is function of detector
  sensitivity threshold and operation energy band. For instance\, the durat
 ion of GRB060418 burst t90 is ~52 s according to Swift/BAT data and only 3
 6 s according to RHESSI data. Therefore\, the type of GGB (whether it shor
 t or long) should be defined only taking into account distinctive features
  of instrument detected this event. \nFirstly third intermediate GRBs subg
 roup was found some years ago in BATSE GRB duration and duration-hardness 
 distributions. Attributes of this subgroup appearance in events subsets fo
 r various detectors are discussed.\n\nhttps://indico.particle.mephi.ru/eve
 nt/2/contributions/387/
LOCATION:Milan Hotel 4* Bellini
URL:https://indico.particle.mephi.ru/event/2/contributions/387/
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