GRB060614: a "fake" short GRB from a merging binary system
Letizia Caito, Maria Grazia Bernardini, Carlo Luciano Bianco, Maria, Giovanna Dainotti, Roberto Guida, Remo Ruffini

TL;DR
GRB060614, a long-duration gamma-ray burst without an associated supernova, is explained as a 'disguised' short GRB originating from a binary neutron star or white dwarf merger within the fireshell model.
Contribution
This study demonstrates that GRB060614 can be interpreted as a 'fake' short GRB within the fireshell model, highlighting the role of the circumburst medium and binary progenitors.
Findings
GRB060614's light curves fit the fireshell model with a low-density galactic halo environment.
The initial spike is identified as the P-GRB, followed by an extended afterglow.
The progenitor is likely a white dwarf-neutron star binary, explaining the absence of a supernova.
Abstract
(Shortened) CONTEXT: [...] GRB060614 is the first nearby long duration GRB clearly not associated to a bright Ib/c supernova. Moreover, its duration (T_{90} ~ 100s) makes it hardly classifiable as a short GRB. It presents strong similarities with GRB970228, the prototype of the new class of "fake" short GRBs that appear to originate from the coalescence of binary neutron stars or white dwarfs spiraled out into the galactic halo. AIMS: Within the "canonical" GRB scenario based on the "fireshell" model, we test if GRB060614 can be a "fake" or "disguised" short GRB. [...] METHODS: We fit GRB060614 light curves in Swift's BAT (15-150keV) and XRT (0.2-10keV) energy bands. Within the fireshell model, light curves are formed by two well defined and different components: the Proper-GRB (P-GRB), emitted at the fireshell transparency, and the extended afterglow, due to the interaction between the…
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