The Role of T50 in the Classification of Gamma-ray Bursts

Details The Role of T50 in the Classification of Gamma-ray Bursts The Role of T50 in the Classification of Gamma-ray Bursts

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004chjaa...4..349z&link_type=abstract

Chinese Journal of Astronomy & Astrophysics, Vol. 4, p. 349-356

Astronomy and Astrophysics

Astrophysics

Gamma Ray: Bursts, Gamma Ray: Observations

Scientific paper

The role of T50 in classifying gamma-ray bursts (GRBs) is investigated. We take T50=0.7 s as the line of division and find that some bursts belonging to the class of long bursts defined by T90 ≥ 2 s now become short bursts (sample 1), while some belonging to the class of short bursts defined by T90 < 2 s now become long bursts (sample 2). We study how these sources are affected by the two methods of classification and find the change of classes of sample 1 is due to some peculiar properties of the light curves. Based on their characters, most of the bursts of sample 1 should be taken as short bursts.

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