Comparative study of long and short GRB afterglows: The case of GRB 051221a

Alessandra Corsi, Luigi Piro

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


The generally accepted scenario for Gamma-Ray Burst (GRB) progenitors relates short bursts with the merger of compact binaries and long bursts with the collapse of massive rotating stars. In this framework, short GRBs are expected to occur preferentially in a tenuous interstellar medium, while long ones should be linked with star forming regions and should thus be characterized by a higher density environment. Within the standard fireball model, the density of the medium surrounding the burst site is a parameters which can be constrained by comparing afterglow data with the model predictions, provided the afterglow is sufficiently well-sampled with broad-band observations. Here we give an overview of the method we have set up, aimed to test the expected difference in density parameter, via a comparative study of short and long GRB afterglows. The first results, obtained for the short GRB 051221a, are presented.

Original languageEnglish
Title of host publicationGamma-Ray Bursts 2007 - Proceedings of the Santa Fe Conference
Number of pages4
StatePublished - 2008
EventSanta Fe Conference on Gamma-Ray Bursts 2007, GRB 2007 - Santa Fe, NM, United States
Duration: Nov 5 2007Nov 9 2007

Publication series

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


ConferenceSanta Fe Conference on Gamma-Ray Bursts 2007, GRB 2007
Country/TerritoryUnited States
CitySanta Fe, NM


  • X-rays
  • bursts-Gamma rays
  • bursts-Synchrofron radiation


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