Understanding the Nature of Dark Bursts with the Afterglow of GRB 060108

Details Understanding the Nature of Dark Bursts with the Afterglow of GRB 060108 Understanding the Nature of Dark Bursts with the Afterglow of GRB 060108

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..924..449o&link_type=abstract

THE MULTICOLORED LANDSCAPE OF COMPACT OBJECTS AND THEIR EXPLOSIVE ORIGINS. AIP Conference Proceedings, Volume 924, pp. 449-452

Computer Science

Gamma-Ray Sources, Gamma-Ray Bursts

Scientific paper

We present observations of GRB 060108, the 100th burst detected by Swift. The optical afterglow was found to be below UVOT detection limits within the first 100 s, and the ratio of X-ray and R band measurements at ~ 1000 s after the trigger gives a spectral index βOX = 0.45, which makes this burst ``dark'' according to the Jakobbson classification. We derive a maximum photometric redshift of z<3.2, which excludes a high redshift as a possible cause of the observed darkness, and we find that the most likely explanation is a combination of intrinsic faintness, a hard optical to X-ray spectrum and dust extinction.

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