Spectral evolution of swift Gamma-ray Burst tails: An update

V. Mangano, B. Sbarufatti

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The detailed study of the spectral evolution during the steep decay phase of early X-ray light curves of Gamma-ray Bursts (GRBs) is a very important task that can give us information on different emission components contributing to the prompt-to-afterglow transition. Time resolved spectral analysis of bright GRBs detected by Swift has shown that a good modeling of the early X-ray light curves can be obtained with Band or cut-off power-law broad band spectra with evolving parameters (e.g., decaying peak energy). We developed a procedure to simultaneously fit the temporal evolution of all the spectral parameters of a GRB during the prompt to afterglow transition based on the analysis of the Swift Burst Alert Telescope (BAT) and the Swift X-ray Telescope (XRT) count rate and hardness ratio light curves. The procedure has been tested on GRB 060614 and GRB 090618, two very peculiar bright GRB detected by Swift that show a long exponentially decaying tail with strong softening and peak energy crossing the XRT energy band.

Original languageEnglish (US)
Title of host publicationDeciphering the Ancient Universe with Gamma-Ray Bursts
Number of pages3
StatePublished - 2010
EventInternational Symposium "Deciphering the Ancient Universe with Gamma-Ray Bursts" - Kyoto, Japan
Duration: Apr 19 2010Apr 23 2010

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


OtherInternational Symposium "Deciphering the Ancient Universe with Gamma-Ray Bursts"

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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