Issue |
A&A
Volume 447, Number 1, February III 2006
|
|
---|---|---|
Page(s) | 121 - 132 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20052803 | |
Published online | 27 January 2006 |
Gamma-ray bursts associated with supernovae: a systematic analysis of BATSE GRB candidates
1
SISSA/ISAS, via Beirut 2-4, 34014 Trieste, Italy e-mail: celotti@sissa.it
2
INAF – Observatory of Brera, via Bianchi 46, 23807 Merate (LC), Italy
3
INAF – Observatory of Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
4
INAF – Observatory of Trieste, via G.B. Tiepolo 11, 34131 Trieste, Italy
Received:
1
February
2005
Accepted:
25
September
2005
We examined the properties of a sample of BATSE Gamma-Ray
Bursts (GRBs) comprising events which have indications of association
with a supernova (SN), some on the basis of indications of
re-brightening in the optical afterglow light curve, but in most
cases based only on the “loose” temporal and directional coincidence
inferred from the cross correlation of catalogs. Despite the large
uncertainties in the latter selection method, the temporal and
spectral analysis reveal three interesting statistical results when
the sample is compared with that of all the BATSE GRBs: the GRBs
tentatively associated with SNe are found to predominantly (in ~80% of the cases) have single-peaked light curves, a softer spectrum
(i.e. low energy power law index ) and tend not to
follow the Lag-Luminosity and Isotropic Energy-Peak Energy
correlations. These three independent statistical properties point
toward the existence of a significant number of under-luminous,
GRB 980425-like events constituting – at least from an observational
point of view – a tail or a separate class with respect to the whole
of the BATSE GRB events. The unusually high percentage of SN Ibc among
those identified by the catalog cross-correlation (a factor ~four
higher than expected from SN catalog statistics) reinforces the
non-randomness of some of the selected events.
Key words: gamma rays: bursts / methods: data analysis / stars: supernovae: general
© ESO, 2006
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