2012A&A...548L...7T

Query : 2012A&A...548L...7T

2012A&A...548L...7T - Astronomy and Astrophysics, volume 548L7-7 (2012/12-1)

Searching for Galactic sources in the Swift GRB catalog. Statistical analyses of the angular distributions of FREDs.

TELLO J.C., CASTRO-TIRADO A.J., GOROSABEL J., PEREZ-RAMIREZ D., GUZIY S., SANCHEZ-RAMIREZ R., JELINEK M., VERES P. and BAGOLY Z.

Abstract (from CDS):

Since the early 1990s, gamma ray bursts (GRB) have been accepted to be of extra-Galactic origin because of the isotropic distribution observed by BATSE and the redshifts observed via absorption line spectroscopy. Nevertheless, upon closer examination at least one case turned out to be of Galactic origin. This particular event presented a fast rise and exponential decay (FRED) structure, which leads us to believe that other FRED sources might also be Galactic. This study was set out to estimate the most probable degree of contamination by Galactic sources that certain samples of FREDs have. To quantify the degree of anisotropy, the average dipolar and quadripolar moments of each sample of GRBs with respect to the Galactic plane were calculated. This was then compared to the probability distribution of simulated samples comprising a combination of isotropically generated sources and Galactic sources. We observe that the dipolar and quadripolar moments of the selected subsamples of FREDs are found more than two standard deviations outside those of random isotropically generated samples. The most probable degree of contamination by Galactic sources for the FRED GRBs of the Swift catalog detected until February 2011 that do not have a known redshift is about 21 out of 77 sources, which represents roughly 27%. Furthermore, we observe that by removing from this sample those bursts that have any type of indirect redshift indicator and multiple peaks, the most probable contamination increases to 34% (17 out of 49 sources). It is probable that a high degree of contamination by Galactic sources occurs among the single-peak FREDs observed by Swift. Accordingly, we encourage additional studies on these types of events to determine the nature of what could be an exotic type of Galactic source.

Abstract Copyright: ∼

Journal keyword(s): gamma-ray burst: general - stars: magnetars - methods: statistical

Simbad objects: 111

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Number of rows : 111
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 091208A gB 00 01 10.90 +65 40 47.7           ~ 24 0
2 Fermi bn100802240 gB 00 09 52.47 +47 45 19.1           ~ 61 0
3 GRB 100115A gB 00 13 28.16 -00 49 35.4           ~ 20 0
4 GRB 060912 gB 00 21 08.160 +20 58 17.80 17.61   17.56     ~ 42 0
5 GRB 070531 gB 00 26 57.940 +74 18 46.62           ~ 41 0
6 GRB 070808 gB 00 27 03.40 +01 10 35.4           ~ 55 0
7 GRB 080710 gB 00 33 05.68 +19 30 05.8           ~ 136 0
8 GRB 070810B gB 00 35 48.4 +08 49 18           ~ 57 0
9 GRB 090520 gB 00 46 27.1 -08 00 00           ~ 10 0
10 GRB 060719 gB 01 13 43.380 -48 22 55.09           ~ 107 0
11 GRB 100823A gB 01 22 49.03 +05 50 06.4           ~ 38 0
12 GRB 080523 gB 01 23 11.53 -64 01 50.9           ~ 35 0
13 Fermi bn100814160 gB 01 29 53.61 -17 59 43.6           ~ 219 0
14 Fermi bn091208410 gB 01 57 38.50 +16 52 50.7           ~ 220 0
15 GRB 091018 gB 02 08 46 -57 33.0           ~ 169 0
16 GRB 080707 gB 02 10 28.48 +33 06 35.1           ~ 83 0
17 GRB 050406 gB 02 17 52.200 -50 11 15.81     18.83     ~ 125 0
18 GRB 071112C gB 02 36 50.89 +28 22 16.9           ~ 164 0
19 GRB 050603 gB 02 39 56.839 -25 10 54.92     18.48     ~ 174 0
20 GRB 070326 gB 02 41 20.8 -66 59 21           ~ 10 0
21 GRB 080701A gB 03 03 46.50 +75 28 50.7           ~ 7 0
22 Fermi bn101011707 gB 03 13 10.62 -65 58 55.6           ~ 48 0
23 GRB 070318 gB 03 13 56.830 -42 56 46.30 18.27 16.23 15.49     ~ 170 0
24 GRB 060904B gB 03 52 50.520 -00 43 30.61 18.27 19.14 18.37     ~ 208 0
25 GRB 060110 gB 04 50 57.850 +28 25 55.70           ~ 59 0
26 GRB 080903 gB 05 47 09.60 +51 15 22.4           ~ 38 0
27 GRB 050826 gB 05 51 01.590 -02 38 35.40           ~ 136 0
28 GRB 081121 gB 05 57 07.70 -60 36 42.1           ~ 152 0
29 GRB 090401B gB 06 20 21.11 -08 58 20.2           ~ 58 0
30 GRB 081104 gB 06 42 00 -54 43.3           ~ 29 0
31 GRB 090904A gB 06 43 32.35 +50 12 10.8           ~ 43 0
32 GRB 080517 gB 06 48 58.00 +50 44 06.3           ~ 52 1
33 GRB 061202 gB 07 02 06.190 -74 41 54.91           ~ 83 0
34 GRB 080303A gB 07 28 14.18 -70 14 03.2           ~ 39 0
35 GRB 071028 gB 07 59 18.6 +21 28 22           ~ 9 0
36 Fermi bn090518080 gB 07 59 50 +00 46.7           ~ 52 0
37 GRB 070612 gB 08 05.4 +37 15           ~ 13 0
38 GRB 070520B gB 08 07 31.070 +57 36 30.00           ~ 42 0
39 GRB 051016 gB 08 11 16.65 -18 17 55.1           ~ 16 0
40 GRB 100213B gB 08 17 08.12 +43 26 48.6           ~ 28 0
41 GRB 051227 gB 08 20 58.107 +31 55 32.01           ~ 127 0
42 GRB 051021B gB 08 24 12.260 -45 32 28.80           ~ 39 0
43 GRB 060515 gB 08 29 09.490 +73 34 02.82           ~ 37 0
44 Fermi bn100704149 gB 08 54 33.92 -24 12 09.7           ~ 103 0
45 GRB 100423A gB 09 05 53.00 +21 29 13.4           ~ 24 0
46 GRB 080307 gB 09 06 30.73 +35 08 19.8           ~ 53 0
47 GRB 060213 gB 09 26 24.140 -09 06 57.40           ~ 19 0
48 SDSS J093805.33+153719.0 G 09 38 05.33384 +15 37 19.0406           ~ 146 0
49 GRB 061102 gB 09 53 37.840 -17 01 26.50           ~ 32 0
50 GRB 071010B gB 10 02 09.20 +45 43 52.2           ~ 173 0
51 Fermi bn100727238 gB 10 16 42.67 -21 23 25.1           ~ 43 0
52 GRB 050319 gB 10 16 47.900 +43 32 53.80   18.02 17.01     ~ 274 0
53 GRB 100316B gB 10 54 00 -45 28.0           ~ 62 0
54 GRB 080430 gB 11 01 14.63 +51 41 07.8           ~ 157 0
55 GRB 080613B gB 11 35 11.51 -07 06 17.5           ~ 51 0
56 GRB 080320 gB 11 50 56.37 +57 09 25.3           ~ 53 0
57 GRB 090530 gB 11 57 36.00 +26 35 23.0           ~ 89 0
58 GRB 080714 gB 12 32 25.29 -60 16 40.2           ~ 54 0
59 GRB 070208 gB 13 11 32.607 +61 57 54.37 20.79 20.79 19.86     ~ 119 0
60 GRB 050801 gB 13 36 35.000 -21 55 41.00 15.03 15.82 15.46     ~ 164 0
61 GRB 080915B gB 14 12 21.20 -11 29 26.9           ~ 18 0
62 GRB 050717 gB 14 17 24.440 -50 32 00.10           ~ 68 0
63 GRB 051117A gB 15 13 34.020 +30 52 12.30 18.66 19.81       ~ 72 0
64 GRB 060526 gB 15 31 18.360 +00 17 04.90   18.31 17.16     ~ 288 0
65 GRB 070509 gB 15 51 50.400 -78 39 07.50           ~ 33 0
66 Fermi bn101213451 gB 16 05 15.27 +21 53 50.5           ~ 68 0
67 GRB 100702A gB 16 22 47.26 -56 31 53.8           ~ 53 0
68 Fermi bn110102788 gB 16 23 31.41 +07 36 49.8           ~ 62 0
69 Fermi bn100111176 gB 16 28 11.60 +15 33 02.3           ~ 47 0
70 GRB 090726 gB 16 34 43.50 +72 51 56.5           ~ 70 0
71 GRB 100316A gB 16 47 55.56 +71 49 40.0           ~ 34 0
72 GRB 050721 gB 16 53 44.530 -28 22 51.80     19.63     ~ 62 0
73 GRB 070518 gB 16 56 47.750 +55 17 41.40 18.68 19.22 19.01     ~ 75 0
74 GRB 080319C gB 17 15 55.48 +55 23 31.7           ~ 174 0
75 GRB 070219 gB 17 20 46.190 +69 22 12.69           ~ 40 0
76 GRB 060926 gB 17 35 43.660 +13 02 18.60     19.36     ~ 135 0
77 Fermi bn090129880 gB 17 56 25.10 -32 47 34.8           ~ 36 0
78 GRB 070330 gB 17 58 09.980 -63 47 34.80     18.87     ~ 48 0
79 Fermi bn091026550 gB 18 26 -86.1           ~ 46 0
80 GRB 080727B gB 18 27 26.11 +01 09 45.7           ~ 37 0
81 GRB 060919 gB 18 27 41.740 -51 00 52.41           ~ 41 0
82 GRB 080325 gB 18 31 34.40 +36 31 26.1           ~ 76 0
83 GRB 060403 gB 18 49 21.600 +08 19 46.80           ~ 46 0
84 GRB 080503 gB 19 06 28.74 +68 47 35.8           ~ 172 0
85 GRB 100917A gB 19 17 00.10 -17 07 12.1           ~ 16 0
86 GRB 101017A gB 19 25 32.56 -35 08 41.4           ~ 33 0
87 GRB 070917 gB 19 35 40.53 +02 24 40.4           ~ 47 0
88 GRB 101114A gB 20 12 50.67 +14 01 57.6           ~ 14 0
89 GRB 050315 gB 20 25 54.100 -42 36 02.19           ~ 225 0
90 GRB 050421 gB 20 29 02.850 +73 39 17.91           ~ 75 0
91 GRB 050713B gB 20 31 15.570 +60 56 43.70           ~ 72 0
92 GRB 080805 gB 20 56 55.30 -62 25 58.8           ~ 102 0
93 GRB 090727 gB 21 03 50.79 +64 55 29.8           ~ 39 0
94 GRB 101023A gB 21 11 51.26 -65 23 17.7           ~ 71 0
95 GRB 060605 gB 21 28 37.320 -06 03 31.30   20.12 16.53     ~ 210 0
96 GRB 060522 gB 21 31 44.850 +02 53 10.80           ~ 140 0
97 GRB 080413B gB 21 44 34.62 -19 58 51.2           ~ 191 0
98 GRB 100514A gB 21 55 17 +29 10.2           ~ 26 0
99 Fermi bn101008697 gB 21 55 30.05 +37 04 01.7           ~ 40 0
100 GRB 060607 gB 21 58 50.400 -22 29 46.70 18.49 16.67 15.09     ~ 318 0
101 GRB 071117 gB 22 20 10.40 -63 26 36.6           ~ 112 0
102 Fermi bn080916406 gB 22 25 09.30 -57 01 33.7           ~ 177 0
103 GRB 061110A gB 22 25 09.800 -02 15 30.70 21.43         ~ 134 0
104 GRB 060604 gB 22 28 55.010 -10 54 55.80 20.34 20.31       ~ 134 0
105 Fermi bn091024380 gB 22 37 +56.9           ~ 151 0
106 GRB 110223A gB 23 03 22.68 +87 33 28.5           ~ 29 0
107 GRB 051111A gB 23 12 33.170 +18 22 28.80 19.77 20.08 19.50     ~ 223 0
108 GRB 071028B gB 23 36 38.83 -31 37 13.3           ~ 26 0
109 GRB 080702B gB 23 42 16.20 -05 30 46.7           ~ 20 0
110 GRB 060707 gB 23 48 19.000 -17 54 17.00     19.79     ~ 170 0
111 GRB 061222A gB 23 53 03.419 +46 31 58.60           ~ 177 0

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