GRB 071227: an additional case of a disguised short burst
Letizia Caito, Lorenzo Amati, Maria Grazia Bernardini, Carlo Luciano, Bianco, Gustavo De Barros, Luca Izzo, Barbara Patricelli, Remo Ruffini

TL;DR
This paper analyzes GRB 071227 within the fireshell model, revealing it as a disguised long burst with a soft tail fulfilling the Amati relation, challenging its initial short burst classification.
Contribution
The study demonstrates that GRB 071227 is a disguised long burst, providing a new example and applying the fireshell model to reclassify its nature.
Findings
GRB 071227's soft tail fulfills the Amati relation.
Simulations show parameters consistent with long-duration GRBs.
GRB 071227 is a disguised long burst, not a true short burst.
Abstract
(shortened) [...] In the context of the fireshell model, [...] a new family of disguised short bursts has been identified: long bursts with a protracted low instantaneous luminosity due to a low density CircumBurst Medium (CBM). In the 15-150 keV energy band GRB 071227 exhibits a short duration (about 1.8s) spike-like emission followed by a very soft extended tail up to one hundred seconds after the trigger. It is a faint (E_{iso}=5.8x10^{50}) nearby GRB (z=0.383) that does not have an associated type Ib/c bright supernova (SN). For these reasons, GRB 071227 has been classified as a short burst not fulfilling the Amati relation holding for long burst. We check the classification of GRB 071227 provided by the fireshell model. In particular, we test whether this burst is another example of a disguised short burst, after GRB 970228 and GRB 060614, and, for this reason, whether it fulfills…
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