Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.1005a&link_type=abstract
American Astronomical Society Meeting 210, #10.05; Bulletin of the American Astronomical Society, Vol. 39, p.107
Astronomy and Astrophysics
Astronomy
Scientific paper
In recent years, several luminosity indicators have been found for gamma-ray bursts (GRBs). These indicators are measurable light curve and spectral properties which can be related to the GRB luminosity. Band (2004), Yonetoku (2004), and Fenimore (2000) have each applied one different luminosity relation to find redshifts for BATSE GRBs. These papers have all independently identified specific bursts with z > 8, although no error bars are given. The existence of such high redshift events is not surprising, as BATSE has enough sensitivity to see them (Lamb and Reichart 2000) and GRBs are expected out to the redshift of the first star formation (Bromm and Loeb 2002). To improve results we used five luminosity relations with updated calibrations to determine redshifts with error bars. The five relations correlate luminosity to lag, variability, minimum rise time, number of peaks, and spectral peak energy. Combining these relations we found redshifts for 36 BATSE GRBs for which the previously mentioned papers claimed z > 8. Our results include 16 bursts with a best redshift zbest > 5 and 5 with zbest >10, which looks promising at first. But the calculated redshift uncertainties are significantly large in these cases, therefore it is more useful to look at the redshift of the lower edge of the 1-sigma range. Only 5 bursts have 5 < z1σmin < 6 while one burst was z1σmin > 10. However, the one burst with z1σmin > 10 (BATSE # 2035) is likely a short duration burst (T90 = 5.06 seconds in the Earth rest frame) for which the relations do not apply. In all, we cannot point toward any one BATSE burst as confidently having z > 6.
Ashcraft Teresa
Schaefer Bradley E.
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