GRB Photometric Redshifts and Spectral Slopes From the Swift UVOT

Details GRB Photometric Redshifts and Spectral Slopes From the Swift UVOT GRB Photometric Redshifts and Spectral Slopes From the Swift UVOT

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20921207v&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #212.07; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We show how data from the Swift UVOT can be used to provide early estimates of photometric redshifts and spectral slopes of GRB afterglows. The UVOT has detected 80% of the Swift afterglows with secure redshifts, including GRB060522 at z=5.11. The correlation between photometric and spectroscopic redshifts is very strong, but is best beyond z=1.3, where Lyman absorption becomes significant in the UVOT bands. Spectral slopes are best constrained at low redshifts, where photometric detections span a wide wavelength range. We discuss the prospects for quickly flagging very high-redshift (z>5) GRB candidates.

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