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The “Christmas burst” GRB 101225A revisited

Published online by Cambridge University Press:  24 March 2015

C. C. Thöne ,
A. de Ugarte Postigo ,
C. L. Fryer  and
D. A. Kann
C. C. Thöne
Affiliation:
IAA - CSIC, Glorieta de la Astronomía s/n, 18008, Granada, Spain email: [email protected]
A. de Ugarte Postigo
Affiliation:
IAA - CSIC, Glorieta de la Astronomía s/n, 18008, Granada, Spain email: [email protected] Dark Cosmology Center, Juliane Maries Vej 30, 2100 Copenhagen, Denmark
C. L. Fryer
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, USA
D. A. Kann
Affiliation:
Thüringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany
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Abstract

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Long GRBs are related to the death of massive stars and reveal themselves through synchrotron emission from highly relativistic jets. The ‘Christmas Burst’ GRB 101225A was an exceptionally long GRB with a thermal afterglow, very different from the standard GRB. Initially, no spectroscopic redshift could be obtained and SED modeling yielded z=0.33. A plausible model was a He-NS star merger where the He-star had ejected part of its envelope in the common envelope phase during inspiral. The interaction between the jet and the previously ejected shell can explains the thermal emission. We obtained deep spectroscopy of the host galaxy which leads to a correction of the redshift to z=0.847. Despite the higher redshift, our model is still valid and theoretically better justified than the alternative suggestion of a blue supergiant progenitor proposed by Levan et al. (2014) for several “ultra-long” GRBs.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S313: Extragalactic jets from every angle , September 2014 , pp. 396 - 397
Copyright
Copyright © International Astronomical Union 2015 

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