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Table 1

28 type-I gamma ray bursts with possible redshift measurements and T90 duration equal to or shorter than four secondsa.

GRB Instrument Optical afterglow Duration [s] Redshift Classification

020531 HETE yes 1.0 1.0 probable
040924 HETE yes  ~1.5 0.859 reliable
050416 SWIFT/XRT yes 2.4  ±  0.2 0.6535  ±  0.002 reliable
050509B SWIFT/XRT no? 0.03 0.2248  ±  0.0002 implausible
050709 HETE yes 0.22  ±  0.05 0.1606  ±  0.0001 reliable
050724 SWIFT/XRT yes 3.0  ±  1.0 0.2576  ±  0.0004 reliable
050813 SWIFT/XRT yes? 0.6  ±  0.1 0.722 probable
050906 SWIFT/BAT no 0.128  ±  0.016 0.43 implausible
051016B SWIFT/XRT yes 4.0  ±  0.1 0.9364 reliable
051221A SWIFT/XRT yes 1.4  ±  0.2 0.5465 reliable
060502B SWIFT/XRT no 0.09  ±  0.02 0.287 reliable
060505 SWIFT/XRT yes 4  ±  1 0.089 probable
060801 SWIFT/XRT no 0.5  ±  0.1 1.131 reliable
061006 SWIFT/XRT yes 130  ±  10 0.4377  ±  0.0002 reliable
061201 SWIFT/XRT yes 0.8  ±  0.1 0.111 reliable
061210 SWIFT/XRT no 85  ±  5 0.41 implausible
061217 SWIFT/XRT no 0.3  ±  0.05 0.827 probable
070209 SWIFT/BAT no 0.10  ±  0.02 0.314 implausible
070406 SWIFT/BAT no 0.7  ±  0.2 0.11 implausible
070429B SWIFT/XRT yes? 0.5  ±  0.1 0.9023  ±  0.0002 reliable
070714B SWIFT/XRT yes 64  ±  5 0.9225  ±  0.0001 reliable
070724 SWIFT/XRT no 0.4  ±  0.04 0.457 probable
070810B SWIFT/XRT no? 0.08  ±  0.01 0.49 probable
071227 SWIFT/XRT yes 1.8  ±  0.4 0.384 reliable
080121 SWIFT/XRT no 0.7  ±  0.2 0.046 probable
080520 SWIFT/XRT yes 2.8  ±  0.7 1.545 reliable
090417A SWIFT/BAT no 0.072  ±  0.018 0.088 implausible
090510 SWIFT/XRT yes 0.3  ±  0.1 0.903  ±  0.003 reliable

Notes. The data for these GRB’s are taken from (O’Shaughnessy et al. 2008b) and from diverse GCN circulars (http://gcn.gsfc.nasa.gov/gcn3_archive.html). Reliable redshift values are marked in bold, while implausible redshift values are marked in italics.

(a)

The duration refers to the earth frame. No cosmological correction was applied because of the a priori unknown redshift.

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