TY - GEN
T1 - Comparative study of long and short GRB afterglows
T2 - Santa Fe Conference on Gamma-Ray Bursts 2007, GRB 2007
AU - Corsi, Alessandra
AU - Piro, Luigi
PY - 2008
Y1 - 2008
N2 - 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.
AB - 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.
KW - X-rays
KW - bursts-Gamma rays
KW - bursts-Synchrofron radiation
UR - http://www.scopus.com/inward/record.url?scp=84874844730&partnerID=8YFLogxK
U2 - 10.1063/1.2943518
DO - 10.1063/1.2943518
M3 - Conference contribution
AN - SCOPUS:84874844730
SN - 9780735405332
T3 - AIP Conference Proceedings
SP - 501
EP - 504
BT - Gamma-Ray Bursts 2007 - Proceedings of the Santa Fe Conference
Y2 - 5 November 2007 through 9 November 2007
ER -