%0 Generic %1 citeulike:12550446 %A Margutti, R. %A Soderberg, A. M. %A Wieringa, M. H. %A Edwards, P. G. %A Chevalier, R. A. %A Morsony, B. J. %A Duran, R. Barniol %A Sironi, L. %A Zauderer, B. A. %A Milisavljevic, D. %A Kamble, A. %A Pian, E. %D 2013 %K imported %T The signature of the central engine in the weakest relativistic explosions: GRB100316D %U http://arxiv.org/abs/1308.1687 %X We present late-time radio and X-ray observations of the nearby sub-energetic Gamma-Ray Burst (GRB)100316D associated with supernova (SN) 2010bh. Our broad-band analysis constrains the explosion properties of GRB100316D to be intermediate between highly relativistic, collimated GRBs and the spherical, ordinary hydrogen-stripped SNe. We find that \~10^49 erg is coupled to mildly-relativistic (Gamma=1.5-2), quasi-spherical ejecta, expanding into a medium previously shaped by the progenitor mass-loss with rate Mdot \~10^-5 Msun yr^-1 (for wind velocity v\_w = 1000 km s^-1). The kinetic energy profile of the ejecta argues for the presence of a central engine and identifies GRB100316D as one of the weakest central-engine driven explosions detected to date. Emission from the central engine is responsible for an excess of soft X-ray radiation which dominates over the standard afterglow at late times (t>10 days). We connect this phenomenology with the birth of the most rapidly rotating magnetars. Alternatively, accretion onto a newly formed black hole might explain the excess of radiation. However, significant departure from the standard fall-back scenario is required.

@misc{citeulike:12550446, abstract = {{We present late-time radio and X-ray observations of the nearby sub-energetic Gamma-Ray Burst (GRB)100316D associated with supernova (SN) 2010bh. Our broad-band analysis constrains the explosion properties of GRB100316D to be intermediate between highly relativistic, collimated GRBs and the spherical, ordinary hydrogen-stripped SNe. We find that \~{}10^49 erg is coupled to mildly-relativistic (Gamma=1.5-2), quasi-spherical ejecta, expanding into a medium previously shaped by the progenitor mass-loss with rate Mdot \~{}10^-5 Msun yr^-1 (for wind velocity v\_w = 1000 km s^-1). The kinetic energy profile of the ejecta argues for the presence of a central engine and identifies GRB100316D as one of the weakest central-engine driven explosions detected to date. Emission from the central engine is responsible for an excess of soft X-ray radiation which dominates over the standard afterglow at late times (t\>10 days). We connect this phenomenology with the birth of the most rapidly rotating magnetars. Alternatively, accretion onto a newly formed black hole might explain the excess of radiation. However, significant departure from the standard fall-back scenario is required.}}, added-at = {2019-03-25T08:20:55.000+0100}, archiveprefix = {arXiv}, author = {Margutti, R. and Soderberg, A. M. and Wieringa, M. H. and Edwards, P. G. and Chevalier, R. A. and Morsony, B. J. and Duran, R. Barniol and Sironi, L. and Zauderer, B. A. and Milisavljevic, D. and Kamble, A. and Pian, E.}, biburl = {https://www.bibsonomy.org/bibtex/259fcb9299cea6b05200abbc5bc698186/ericblackman}, citeulike-article-id = {12550446}, citeulike-linkout-0 = {http://arxiv.org/abs/1308.1687}, citeulike-linkout-1 = {http://arxiv.org/pdf/1308.1687}, day = 7, eprint = {1308.1687}, interhash = {93053be421d1911a931583c8d8be8eee}, intrahash = {59fcb9299cea6b05200abbc5bc698186}, keywords = {imported}, month = aug, posted-at = {2013-08-10 21:48:53}, priority = {2}, timestamp = {2019-03-25T08:20:55.000+0100}, title = {{The signature of the central engine in the weakest relativistic explosions: GRB100316D}}, url = {http://arxiv.org/abs/1308.1687}, year = 2013 }