SIMBAD references

2012MNRAS.426L..86O - Mon. Not. R. Astron. Soc., 426, L86-L90 (2012/October-2)

A correlation between the intrinsic brightness and average decay rate of Swift/UVOT gamma-ray burst optical/ultraviolet light curves.

OATES S.R., PAGE M.J., DE PASQUALE M., SCHADY P., BREEVELD A.A., HOLLAND S.T., KUIN N.P.M. and MARSHALL F.E.

Abstract (from CDS):

We examine a sample of 48 Swift/UVOT long gamma-ray burst light curves and find a correlation between the logarithmic luminosity at 200 s and average decay rate determined from 200 s onwards, with a Spearman rank coefficient of -0.58 at a significance of 99.998 per cent (4.2σ). We discuss the causes of the log L_200 s–α>200 s_correlation, finding it to be an intrinsic property of long gamma-ray bursts, and not resulting from the selection criteria. We find two ways to produce the correlation. One possibility is that there is some property of the central engine, outflow or external medium that affects the rate of energy release so that the bright afterglows release their energy more quickly and decay faster than the fainter afterglows. Alternatively, the correlation may be produced by variation of the observer's viewing angle, with observers at large viewing angles observing fainter and slower decaying light curves.

Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): gamma-ray burst: general

Simbad objects: 5

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