The ‘amplitude’ parameter of gamma-ray bursts and its implications for GRB classification

The ‘amplitude’ parameter of gamma-ray bursts and its implications for GRB classification

Traditionally, gamma-ray bursts (GRBs) are classified in the T 90–hardness ratio two-dimensional plane into long/soft and short/hard GRBs. In this paper, we suggest to add the ‘amplitude’ of GRB prompt emission as the third dimension as a complementary criterion to classify GRBs, especially those of...

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Veröffentlicht in:Monthly notices of the Royal Astronomical Society 2014-08, Vol.442 (3), p.1922-1929
Hauptverfasser: Lü, Hou-Jun, Zhang, Bing, Liang, En-Wei, Zhang, Bin-Bin, Sakamoto, Takanori
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Gamma ray astronomy
Starbursts
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container_end_page 1929
container_issue 3
container_start_page 1922
container_title Monthly notices of the Royal Astronomical Society
container_volume 442
creator Lü, Hou-Jun
Zhang, Bing
Liang, En-Wei
Zhang, Bin-Bin
Sakamoto, Takanori
description Traditionally, gamma-ray bursts (GRBs) are classified in the T 90–hardness ratio two-dimensional plane into long/soft and short/hard GRBs. In this paper, we suggest to add the ‘amplitude’ of GRB prompt emission as the third dimension as a complementary criterion to classify GRBs, especially those of short durations. We define three new parameters f, f eff and f eff, z as ratios between the measured/simulated peak flux of a GRB/pseudo-GRB and the flux background, and discuss the applications of these parameters to GRB classification. We systematically derive these parameters to find that most short GRBs are likely not ‘tip-of-iceberg’ of long GRBs. However, one needs to be cautious if a short GRB has a relatively small f (e.g. f 
doi_str_mv 10.1093/mnras/stu982
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subjects Gamma ray astronomy
Starbursts
title The ‘amplitude’ parameter of gamma-ray bursts and its implications for GRB classification
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