Search for nearby host galaxies of short gamma-ray bursts detected and well localized by BATSE/IPN |
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| Authors: | Ya Yu Tikhomirova A S Pozanenko K S Hurley |
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| Institution: | 1.Astrospace Center, Lebedev Physical Institute,Russian Academy of Sciences,Moscow,Russia;2.Space Research Institute,Russian Academy of Sciences,Moscow,Russia;3.California University,California,USA |
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| Abstract: | We have collected the observational data accumulated before the Swift experiment to check the possible connection of short
gamma-ray bursts (GRBs) with low-redshift galaxies. The BATSE/IPN experimental data on well-localized short GRBs and the SDSS
DR5 and PSCz catalogs of galaxies are used. The PSCz sky coverage has allowed us to search for host galaxies for a sample
of 34 short GRBs. One or more galaxies have been found in the error boxes of six bursts, but the probability of a chance coincidence
for each of them is high. No excess of nearby galaxies in the total sample has been detected. The 90% confidence limit corresponds
to the fact that no more than 7%of the short GRBs could originate in nearby galaxies of the PSCz sample. The estimated upper
limit of several percent may be considered to be valid in the volume z = 0.015–0.025. Based on the results of our search, we have estimated the lower limits for the isotropic energies E
γiso of 31 short bursts from our sample. Their values lie within the range 1.0 × 1047–2.7 × 1049 erg. The possible fraction of the flares from magnetars in our sample of short GRBs is discussed. The SDSS sky coverage is
currently insufficient to perform a similar analysis. |
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