Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-05-17
Mon.Not.Roy.Astron.Soc.372:1699-1709,2006
Astronomy and Astrophysics
Astrophysics
13 pages, 9 figures, 2 tables. Accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2006.10972.x
GRB 980425 and GRB 031203 are apparently two outliers with respect to the correlation between the isotropic equivalent energy E_iso emitted in the prompt radiation phase and the peak frequency E_peak of the spectrum in a vF(v) representation (the so-called Amati relation). We discuss if these two bursts are really different from the others or if their location in the E_iso-E_peak plane is the result of other effects, such as viewing them off-axis, or through a scattering screen, or a misinterpretation of their spectral properties. The latter case seems particularly interesting after GRB 060218, that, unlike GRB 031203 and GRB 980425, had a prompt emission detected both in hard and soft X-rays which lasted ~2800 seconds. This allowed to determine its E_peak and total emitted energy. Although it shares with GRB 031203 the total energetics, it is not an outlier with respect to the Amati correlation. We then investigate if a hard-to-soft spectral evolution in GRB 031203 and GRB 980425, consistent with all the observed properties, can give rise to a time integrated spectrum with an E_peak consistent with the Amati relation.
Bosnjak Z.
Firmani Claudio
Ghirlanda Giancarlo
Ghisellini Gabriele
Mereghetti Sandro
No associations
LandOfFree
Are GRB 980425 and GRB 031203 real outliers or twins of GRB 060218? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Are GRB 980425 and GRB 031203 real outliers or twins of GRB 060218?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Are GRB 980425 and GRB 031203 real outliers or twins of GRB 060218? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-678891