Is GRB 100418A a Cosmic Twin of GRB 060614?

Details Is GRB 100418A a Cosmic Twin of GRB 060614? Is GRB 100418A a Cosmic Twin of GRB 060614?

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011japa...32..309j&link_type=abstract

Journal of Astrophysics and Astronomy, Volume 32, Issue 1-2, pp. 309-311

Astronomy and Astrophysics

Astrophysics

Gamma-Rays: Bursts, X-Rays: X-Ray, Individual: Grb 100418A

Scientific paper

GRB 100418A is a long burst at z = 0.624 without detection of associated supernova (SN). We present a detailed analysis on this event and discuss possible origins of its multi-wavelength emission. The temporal features of this event is similar to GRB 060614, a well-known nearby long GRB without SN association (possibly a Type I GRB), indicating that the two events may be cosmic twins. However, both the circum-burst medium density and the GRB classification based on the gamma-ray energy and spectrum suggest that GRB 100418A would be a Type II GRB. These results make a great puzzle on the progenitors of this kind of events, if they belong to the same population.

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