Intermediate GRBs observed by various satellite experiments

International Conference on Particle Physics and Astrophysics

物理学;天文学

Arkhangelskaja, I.V.^1

National Research Nuclear University MEPhI, Moscow Engineering Physics Institute, Kashirskoe Highway 31, Moscow

115409, Russia^1

关键词: Analysis of duration;    COMPTON;    Gamma ray observatories;    Hardness distribution;    Time interval;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/798/1/012007/pdf
DOI  :  10.1088/1742-6596/798/1/012007

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

Firstly GRB duration distribution was analyzed on data of BATSE experiment onboard the Compton Gamma Ray Observatory (CGRO) operated from April 1991 until to June 2000. Usually two GRBs groups separated in duration distribution: short and long. These types of events are classified due to analysis of duration of interval where integrated counts from the GRB raising from 5% to 95% (t90). The value t90∼ 2s is used as boundary between short and long events. However, in 1999 third burst subgroup (intermediate GRBs) was found due to GRBs duration and duration-hardness distributions analysis of 4B current BATSE catalogue (recently available as 5B one) in time interval of 0.8 s ≤ t90≤ 50 s. Since CGRO operation has finished, two satellite experiments GRBs catalogues BAT/Swift and GBM/Fermi contain the amount of bursts comparable with 4B current BATSE catalogue and it is sufficient for duration distribution precision investigation. The results of these distributions analysis are discussed. It allows concluding the appearance of intermediate GRB subgroup on data of three experiments: BATSE/CGRO, BAT/Swift and GBM/Fermi.