Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apr.x6005n&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
Spectral lag measurements for the long (T_90 > 2 s) BATSE GRB sample reveal a subpopulation of ~ 350 bursts with few, wide pulses, lags of a few tenths to several seconds, and soft spectra. Their Log[N] - Log[PF] approximates a -3/2 power-law, suggesting homogeneity and relatively nearby sources. The proportion of these long-lag bursts increases from negligible among bright BATSE bursts to 50 % at trigger threshold. Bursts with very long lags (> 1 s) show a 2-2.5 σ tendency to concentrate near the Supergalactic Plane. GRB 980425 (SN 1998bw) is a member of this subsample of ~ 100 bursts with estimated distances less than 100 Mpc. Assuming beaming fractions near unity, the frequency of these ultra-low luminosity bursts would be ~ 1/4 that of SNe Ib/c. If these sources are truly nearby, the associated core-collapse events might produce gravitational radiation detectable by LIGO-II, and may help explain the flattening of the cosmic ray spectrum at ultra-high energies as recently observed by AGASA. In a sensitivity-limited regime, 10-5.6 < L_53 < 10-2, a power-law scaling relation is indicated for the ultra-low luminosity sources, dN/dL ~ L-1, flatter than expected (dN/dL ~ L^1/6) if viewing angle alone governed observed luminosity.
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