2004A&A...418..487B


Query : 2004A&A...418..487B

2004A&A...418..487B - Astronomy and Astrophysics, volume 418, 487-493 (2004/5-1)

Bimodal distribution of the autocorrelation function in gamma-ray bursts.

BORGONOVO L.

Abstract (from CDS):

Autocorrelation functions (ACFs) are studied for a sample of 16 long gamma-ray bursts (GRBs) with known redshift z, that were observed by the BATSE and Konus experiments. When corrected for cosmic time dilation, the ACF shows a bimodal distribution. A narrow width class (11 bursts) has at half-maximum a mean width τ'0=1.6 s with a relative dispersion of ∼32%, while a broad width class (5 bursts) has τ'0=7.5 s with a ∼4% dispersion. The separation between the two mean values is highly significant (>7σ). This temporal property could be used on the large existing database of GRBs with unknown redshift. The broad width set shows a very good linear correlation between width at half-maximum and (1+z), with a correlation coefficient R=0.995 and a probability of chance alignment <0.0004. The potential application of this correlation to cosmology studies is discussed, using it in combination with recently proposed luminosity indicators.

Abstract Copyright:

Journal keyword(s): gamma rays: bursts - gamma rays: observations - methods: data analysis - cosmology: distance scale

Simbad objects: 16

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Number of rows : 16
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 GRB 000210 gB 01 59 15 -40 40.0           ~ 173 0
2 GRB 991216 gB 05 09 31.2983 +11 17 07.262           ~ 422 0
3 GRB 000131 gB 06 13 31.08 -51 56 41.7     24.7     ~ 168 1
4 GRB 970508 gB 06 53 49.2 +79 16 19           ~ 870 1
5 GRB 980329 gB 07 02 41 +38 50.7           ~ 274 1
6 SN 2003dh SN* 10 44 50.030 +21 31 18.15     16.2     SNIcpec 1211 1
7 GRB 011121 gB 11 34 26.67 -76 01 41.6       23.0   ~ 276 1
8 GRB 990506 gB 11 54 41 -26 45.0           ~ 166 1
9 GRB 971214 gB 11 56 26.4 +65 12 01           ~ 441 1
10 GRB 990510 gB 13 38 07.64 -80 29 48.8           ~ 489 1
11 GRB 010222 G 14 52 12.5 +43 01 06           ~ 356 1
12 GRB 990123 gB 15 25 29 +44 45.0     8.95     ~ 991 1
13 GRB 991208 gB 16 33 53.51 +46 27 21.5           ~ 261 1
14 GRB 970828 gB 18 08 31.6 +59 18 51           ~ 348 1
15 SN 1998bw SN* 19 35 03.17 -52 50 46.1   14.09       SNIc 1830 2
16 GRB 980703 gB 23 59 06.7 +08 35 07           ~ 448 1

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