2009ApJ...707..387X

Query : 2009ApJ...707..387X

2009ApJ...707..387X - Astrophys. J., 707, 387-403 (2009/December-2)

Estimating redshifts for long gamma-ray bursts.

XIAO L. and SCHAEFER B.E.

Abstract (from CDS):

The measurement of redshifts for gamma-ray bursts (GRBs) is an important issue for the study of the high redshift universe and cosmology. We are constructing a program to estimate the redshifts for GRBs from the original Swift light curves and spectra, aiming to get redshifts for the Swift bursts without spectroscopic or photometric redshifts. We derive the luminosity indicators from the light curves and spectra of each burst, including the lag time between low and high photon energy light curves, the variability of the light curve, the peak energy of the spectrum, the number of peaks in the light curve, and the minimum rise time of the peaks. These luminosity indicators can each be related directly to the luminosity, and we combine their independent luminosities into one weighted average. Then with our combined luminosity value, the observed burst peak brightness, and the concordance redshift-distance relation, we can derive the redshift for each burst. In this paper, we test the accuracy of our method on 107 bursts with known spectroscopic redshift. The reduced χ2 of our best redshifts (zbest) compared with known spectroscopic redshifts (zspec) is 0.86, and the average value of log10(zbest/z spec) is 0.01, with this indicating that our error bars are good and our estimates are not biased. The rms scatter of log10(zbest/zspec) is 0.26, with a comparison of 0.30 for rms of log10(zspec). We made a selection on bursts with relatively accurate redshift estimation. The rms of log(z best/zspec) decreases to 0.19, and the rms scatter of log10(zspec)for this subsample is 0.28. For Swift bursts measured over a relatively narrow energy band, the uncertainty in determining the peak energy is one of the main restrictions on our accuracy. Although the accuracy of our zbest values are not as good as that of spectroscopic redshifts, it is very useful for demographic studies, as our sample is nearly complete and the redshifts do not have the severe selection effects associated with optical spectroscopy.

Abstract Copyright: ∼

Journal keyword(s): gamma rays: bursts - cosmology: observations

Simbad objects: 119

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Number of rows : 119
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 GRB 070110 gB 00 03 39.270 -52 58 27.00 21.8 21.9 21.2     ~ 220 0
2 GRB 070611 gB 00 07 58.000 -29 45 19.40           ~ 94 0
3 GRB 071031 gB 00 25 37.40 -58 03 33.9           ~ 184 0
4 GRB 021004 gB 00 26 54.68 +18 55 41.6           ~ 560 0
5 GRB 050824 gB 00 48 56.100 +22 36 32.00 19.66 21.03 20.46 23.70   ~ 184 0
6 GRB 041006 gB 00 54 50.17 +01 14 07.0           ~ 202 2
7 GRB 050908 gB 01 21 50.750 -12 57 17.20           ~ 179 0
8 GRB 000210 gB 01 59 15 -40 40.0           ~ 175 0
9 GRB 040924 gB 02 06 22.52 +16 08 48.8           ~ 169 1
10 GRB 060908 gB 02 07 18.360 +00 20 31.20 16.99 18.34 16.85     ~ 217 0
11 GRB 080707 gB 02 10 28.48 +33 06 35.1           ~ 83 0
12 GRB 050406 gB 02 17 52.200 -50 11 15.81     18.83     ~ 125 0
13 GRB 000911 gB 02 18 42 +07 48.0           ~ 163 0
14 GRB 070802 gB 02 27 35.91 -55 31 39.1           ~ 168 0
15 GRB 080411 gB 02 31 54.82 -71 18 07.5           ~ 109 0
16 GRB 050603 gB 02 39 56.839 -25 10 54.92     18.48     ~ 174 0
17 GRB 061007 gB 03 05 19.510 -50 30 02.50 14.28 14.40 12.95     ~ 315 1
18 GRB 070318 gB 03 13 56.830 -42 56 46.30 18.27 16.23 15.49     ~ 170 0
19 GRB 060115 gB 03 36 08.400 +17 20 43.00           ~ 179 0
20 GRB 060223A gB 03 40 49.560 -17 07 48.40     17.90     ~ 98 0
21 GRB 060210 gB 03 50 57.370 +27 01 34.40   20.27       ~ 275 0
22 GRB 070714B G 03 51 22.2720 +28 17 50.943           ~ 248 0
23 GRB 060904B gB 03 52 50.520 -00 43 30.61 18.27 19.14 18.37     ~ 208 0
24 GRB 970228 gB 05 01 46.7 +11 46 53           ~ 650 1
25 GRB 991216 gB 05 09 31.2983 +11 17 07.262           ~ 430 0
26 GRB 990705 gB 05 09 54.5 -72 07 53           ~ 229 1
27 GRB 050826 gB 05 51 01.590 -02 38 35.40           ~ 136 0
28 GRB 000131 gB 06 13 31.08 -51 56 41.7     24.7     ~ 172 1
29 GRB 060729 gB 06 21 31.850 -62 22 12.69           ~ 303 0
30 GRB 970508 gB 06 53 49.2 +79 16 19           ~ 883 1
31 GRB 061222B gB 07 01 24.600 -25 51 36.00     19.87     ~ 87 0
32 GRB 070411 gB 07 09 19.930 +01 03 52.60     17.94     ~ 138 0
33 GRB 080516 gB 08 02 34.16 -26 09 35.3           ~ 59 0
34 GRB 070612A gB 08 05 28.530 +37 16 09.57           ~ 82 0
35 SN 2002lt SN* 08 08 59.858 +06 43 37.52           SNIc: 363 1
36 GRB 051016B gB 08 48 27.810 +13 39 20.00 20.45         ~ 153 0
37 GRB 050505 gB 09 27 03.300 +30 16 23.70     20.74     ~ 206 0
38 GRB 020124 gB 09 32 50.8 -11 31 11           ~ 155 0
39 GRB 060108 gB 09 48 01.980 +31 55 08.59           ~ 107 0
40 GRB 061121 gB 09 48 54.570 -13 11 42.68 17.19 17.71 17.02     ~ 350 0
41 Fermi bn090423330 gB 09 55 33.19 +18 08 57.7           ~ 392 0
42 GRB 071010B gB 10 02 09.20 +45 43 52.2           ~ 173 0
43 SN 2003dh SN* 10 44 50.030 +21 31 18.15     16.2     SNIcpec 1261 1
44 GRB 080430 gB 11 01 14.63 +51 41 07.8           ~ 157 0
45 GRB 030323 gB 11 06 09.4 -21 46 13           ~ 138 1
46 GRB 080330 gB 11 17 06.70 +30 36 24.1           ~ 145 0
47 GRB 030115 gB 11 18 32.6 +15 02 59           ~ 90 1
48 GRB 030226 gB 11 33 04.9 +25 53 56           ~ 212 0
49 GRB 080603B gB 11 46 07.46 +68 03 38.5           ~ 153 0
50 GRB 990506 gB 11 54 41 -26 45.0           ~ 169 1
51 GRB 971214 gB 11 56 26.4 +65 12 01           ~ 445 1
52 GRB 050408 gB 12 02 17.320 +10 51 10.00           ~ 153 0
53 GRB 030328 gB 12 10 48.4 -09 20 51           ~ 148 0
54 GRB 030429 gB 12 13 07.495 -20 54 49.54     23.70     ~ 132 0
55 GRB 050416 gB 12 33 54.600 +21 03 26.69     19.12     ~ 300 1
56 NAME Hubble Deep Field reg 12 36 49.5 +62 12 58           ~ 1967 1
57 GRB 070810A gB 12 39 51.18 +10 45 02.8           ~ 80 0
58 GRB 080607A gB 12 59 47.14 +15 55 09.6           ~ 257 0
59 GRB 060512 gB 13 03 05.810 +41 11 27.21 19.12 19.63 17.20     ~ 142 0
60 GRB 070208 gB 13 11 32.607 +61 57 54.37 20.79 20.79 19.86     ~ 119 0
61 GRB 060206 gB 13 31 43.420 +35 03 03.60   19.99 17.09     ~ 330 0
62 GRB 990510 gB 13 38 07.64 -80 29 48.8           ~ 499 1
63 GRB 020405 gB 13 58 03.12 -31 22 22.2   21.9 21.5     ~ 259 1
64 GRB 050730 gB 14 08 17.090 -03 46 18.90   20.32 17.68     ~ 327 0
65 GRB 080319B gB 14 31 41.04 +36 18 09.2           ~ 508 0
66 GRB 050802 gB 14 37 05.820 +27 47 12.62 16.85 17.38 16.97     ~ 186 0
67 GRB 080310 gB 14 40 13.89 -00 10 30.4           ~ 214 0
68 GRB 060814 gB 14 45 21.480 +20 35 11.80           ~ 241 0
69 GRB 010222 G 14 52 12.5 +43 01 06           ~ 364 1
70 GRB 080721A gB 14 57 55.76 -11 43 24.9           ~ 180 0
71 GRB 060714 gB 15 11 26.450 -06 33 58.30   20.21 18.54     ~ 209 0
72 GRB 990123 gB 15 25 29 +44 45.0     8.95     ~ 1012 1
73 GRB 060526 gB 15 31 18.360 +00 17 04.90   18.31 17.16     ~ 288 0
74 GRB 060418 gB 15 45 42.600 -03 38 20.00 15.73 16.19 14.98     ~ 389 0
75 GRB 070509 gB 15 51 50.400 -78 39 07.50           ~ 33 0
76 GRB 060510B gB 15 56 29.200 +78 34 12.00           ~ 155 0
77 GRB 060502A gB 16 03 42.480 +66 36 02.49     18.65     ~ 143 0
78 GRB 070521 gB 16 10 38.600 +30 15 22.70           ~ 164 0
79 GRB 050401 gB 16 31 28.84 +02 11 14.5           ~ 348 0
80 GRB 991208 gB 16 33 53.51 +46 27 21.5           ~ 269 1
81 GRB 080210 gB 16 45 04.03 +13 49 36.3           ~ 121 0
82 GRB 030528 gB 17 04 00.3 -22 37 10           ~ 90 1
83 GRB 000926 gB 17 04 15 +51 46.0           ~ 373 0
84 GRB 080319C gB 17 15 55.48 +55 23 31.7           ~ 174 0
85 GRB 080605 gB 17 28 30.04 +04 00 56.9           ~ 198 0
86 GRB 060926 gB 17 35 43.660 +13 02 18.60     19.36     ~ 135 0
87 GRB 050814 gB 17 36 45.390 +46 20 21.60           ~ 166 0
88 GRB 050223 gB 18 05 32.200 -62 28 20.40           ~ 109 0
89 GRB 970828 gB 18 08 31.6 +59 18 51           ~ 353 1
90 GRB 071122 gB 18 26 25.26 +47 04 29.5           ~ 80 0
91 GRB 050126 gB 18 32 27.22 +42 22 14.2           ~ 129 0
92 SN 2005nc SN* 18 32 32.560 +26 20 22.34           SNIc: 400 1
93 GRB 080520 gB 18 40 46.50 -54 59 30.4           ~ 68 0
94 GRB 070529 gB 18 54 58.230 +20 39 34.00 20.38   17.25     ~ 98 0
95 GRB 080413A gB 19 09 11.73 -27 40 39.6           ~ 163 0
96 GRB 071010A gB 19 12 14.42 -32 24 06.2           ~ 138 0
97 GRB 041220 gB 19 25 09 +60 37.4           ~ 19 0
98 GRB 020813A gB 19 46 41.874 -19 36 04.81           ~ 316 0
99 GRB 071003 gB 20 07 24.50 +10 56 48.8           ~ 181 0
100 GRB 050315 gB 20 25 54.100 -42 36 02.19           ~ 225 0
101 GRB 070508 gB 20 51 11.810 -78 23 04.88     19.62     ~ 144 0
102 GRB 050922C gB 21 09 33.000 -08 45 30.10 15.15 15.86 14.69     ~ 301 0
103 GRB 060605 gB 21 28 37.320 -06 03 31.30   20.12 16.53     ~ 210 0
104 GRB 060522 gB 21 31 44.850 +02 53 10.80           ~ 140 0
105 GRB 061110B gB 21 35 40.400 +06 52 34.10           ~ 91 0
106 GRB 080413B gB 21 44 34.62 -19 58 51.2           ~ 191 0
107 GRB 060927A gB 21 58 11.930 +05 21 50.32           ~ 215 0
108 GRB 060607 gB 21 58 50.400 -22 29 46.70 18.49 16.67 15.09     ~ 318 0
109 GRB 051109A gB 22 01 15.320 +40 49 23.70   20.09 20.14     ~ 190 0
110 GRB 071117 gB 22 20 10.40 -63 26 36.6           ~ 112 0
111 GRB 061110A gB 22 25 09.800 -02 15 30.70 21.43         ~ 134 0
112 GRB 060604 gB 22 28 55.010 -10 54 55.80 20.34 20.31       ~ 134 0
113 GRB 050820A gB 22 29 38.110 +19 33 37.10 18.33 19.00 18.47     ~ 409 0
114 GRB 010921 gB 22 55 59.90 +40 55 52.9           ~ 173 1
115 GRB 070506 gB 23 08 52.390 +10 43 20.30     19.04     ~ 86 0
116 GRB 051111A gB 23 12 33.170 +18 22 28.80 19.77 20.08 19.50     ~ 223 0
117 GRB 060707 gB 23 48 19.000 -17 54 17.00     19.79     ~ 170 0
118 GRB 051022A gB 23 56 04.200 +19 36 32.30           ~ 194 1
119 GRB 980703 gB 23 59 06.7 +08 35 07           ~ 453 1

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