Are Long-Lag GRBs Different than Other Long GRBs?

Details Are Long-Lag GRBs Different than Other Long GRBs? Are Long-Lag GRBs Different than Other Long GRBs?

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..836..121h&link_type=abstract

GAMMA-RAY BURSTS IN THE SWIFT ERA: Sixteenth Maryland Astrophysics Conference. AIP Conference Proceedings, Volume 836, pp. 121-

Astronomy and Astrophysics

Astrophysics

Gamma-Ray Sources, Gamma-Ray Bursts

Scientific paper

Long-lag GRBs have two different morphologies that can be delineated using the Internal Luminosity Function (ILF). Both burst types are typically dominated by a single broad pulse. Long-lag GRBs with large ILF indices are long FRED (Fast Rise Exponential Decay) bursts having well-defined peaks, while those with small ILF indices are long smooth bursts having no well-defined short timescale pulse structure. Long smooth bursts typically have have the longest lags of any type of GRB time history. We examine the hypothesis that long-lag GRBs are external shock signatures and contrast this with the hypothesis that they are merely broad internal shock pulses.

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