2010ApJ...717..411N

Query : 2010ApJ...717..411N

2010ApJ...717..411N - Astrophys. J., 717, 411-419 (2010/July-1)

Threshold for extended emission in short gamma-ray bursts.

NORRIS J.P., GEHRELS N. and SCARGLE J.D.

Abstract (from CDS):

The initial pulse complex (IPC) in short gamma-ray bursts is sometimes accompanied by a softer, low-intensity extended emission (EE) component. In cases where such a component is not observed, it is not clear if it is present but below the detection threshold. Using Bayesian Block (BB) methods, we measure the EE component and show that it is present in one-quarter of a Swift/BAT sample of 51 short bursts, as was found for the Compton/BATSE sample. We simulate bursts with EE to calibrate the BAT threshold for EE detection and show that this component would have been detected in nearly half of BAT short bursts if it were present, to intensities ∼10–2 counts cm–2/s, a factor of 5 lower than actually observed in short bursts. In the BAT sample, the ratio of average EE intensity to IPC peak intensity, Rint, ranges over a factor of 25, Rint∼ 3x10–3 to 8x10–2. In comparison, for the average of the 39 bursts without an EE component, the 2σ upper limit is Rint< 8x10–4. These results suggest that a physical threshold effect operates near Rint∼ fewx10–3 below which the EE component is not manifest.

Abstract Copyright: ∼

Journal keyword(s): gamma-ray burst: general - methods: data analysis

Simbad objects: 55

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Number of rows : 55
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 070810B gB 00 35 48.4 +08 49 18           ~ 57 0
2 Fermi bn100117879 G 00 45 04.6610 -01 35 42.020           ~ 155 0
3 GRB 050911A gB 00 54 38.290 -38 50 58.50           ~ 66 0
4 PSO J027.8085-18.5940 G 01 51 14.05011120 -18 35 38.4976680           ~ 192 0
5 Fermi bn081024245 gB 01 51 33.80 +61 21 08.2           ~ 75 0
6 GRB 090417A gB 02 19 59.0 -07 10 51           ~ 36 0
7 GRB 070714A gB 02 51 43.36 +30 14 35.1           ~ 63 0
8 GRB 070209 gB 03 04 51.200 -47 22 34.19           ~ 45 0
9 PSO J047.1631+13.1580 G 03 08 39.14930640 +13 09 29.0253240           ~ 144 0
10 GRB 050906 gB 03 31 15.28 -14 36 30.1           ~ 76 1
11 GRB 070729 gB 03 45 16.04 -39 19 19.9           ~ 81 0
12 GRB 070714B G 03 51 22.2720 +28 17 50.943           ~ 248 0
13 GRB 071227A G 03 52 31.0260 -55 59 00.890           ~ 201 0
14 GRB 090815C gB 04 17 57 -65 57.0           ~ 19 0
15 GRB 060313 G 04 26 28.4020 -10 50 39.901 20.55 21.03 19.66     ~ 156 0
16 GRB 061006 G 07 24 07.8080 -79 11 55.188           ~ 214 0
17 GRB 091109B gB 07 30 59.90 -54 05 30.6           ~ 57 0
18 Fermi bn081226044 G 08 02 00.4500 -69 01 49.500           ~ 63 0
19 GRB 051227 gB 08 20 58.107 +31 55 32.01           ~ 127 0
20 GRB 090916 gB 08 26 19.60 +25 56 27.3           ~ 29 0
21 GRB 080121 gB 09 08 56.0 +41 50 29           ~ 40 0
22 SDSS J093805.33+153719.0 G 09 38 05.33384 +15 37 19.0406           ~ 146 0
23 GRB 090715A gB 10 08 24.50 +10 00 22.4           ~ 25 0
24 GRB 061217 gB 10 41 39.320 -21 07 22.11           ~ 128 0
25 GRB 090515 gB 10 56 41.0 +14 27 22           ~ 122 0
26 GRB 070923 gB 12 18 29.5 -38 17 38           ~ 38 0
27 SDSS J123612.87+285858.8 BiC 12 36 12.8803407000 +28 58 58.780075656           ~ 328 1
28 GRB 090426 G 12 36 18.0470 +32 59 09.460           ~ 237 0
29 GRB 090607 gB 12 44 46.70 +44 06 28.4           ~ 40 0
30 GRB 070406 gB 13 15 51.350 +16 30 46.90 20.54         ~ 50 0
31 PSO J203.7673-22.1424 G 13 35 04.16044560 -22 08 32.8717680           ~ 178 0
32 GRB 060801 G 14 12 01.2620 +16 58 55.970           ~ 172 0
33 GRB 090305 G 16 07 07.5960 -31 33 22.540           ~ 53 0
34 GRB 050813 gB 16 07 57.190 +11 14 57.80           ~ 147 0
35 UGCS J162444.39-273226.8 G 16 24 44.38275 -27 32 26.8381     19.70     ~ 469 1
36 GRB 090531B gB 16 48 15.0 -36 01 27           ~ 58 0
37 GRB 071112B gB 17 20 51.0 -80 53 02           ~ 50 0
38 GRB 080919 gB 17 40 53.00 -42 22 29.5           ~ 49 0
39 GRB 051105A gB 17 41 10.010 +34 55 45.16 21.26 21.20 20.33     ~ 53 0
40 GRB 060502B gB 18 35 46.060 +52 37 51.45           ~ 153 1
41 GRB 080503 gB 19 06 28.74 +68 47 35.8           ~ 172 0
42 Fermi bn080905499 G 19 10 42.0450 -18 52 54.510           ~ 200 0
43 GRB 050202 gB 19 22 18.0 -38 44 06           ~ 36 0
44 GRB 050925 gB 20 13 47.570 +34 19 51.40           ~ 72 0
45 GRB 080702A gB 20 52 12.21 +72 18 46.7           ~ 47 0
46 Fermi bn090621922 gB 20 53 49.30 +69 02 02.9           ~ 65 0
47 GRB 060614 G 21 23 32.140 -53 01 36.10           ~ 714 0
48 GRB 070429B G 21 52 03.6910 -38 49 42.820           ~ 125 0
49 GRB 070731 gB 21 54 19.5 -15 44 23           ~ 19 0
50 GRB 051221 G 21 54 48.626 +16 53 27.16 19.49         ~ 377 0
51 GRB 051210 gB 22 00 40.930 -57 36 47.10           ~ 138 0
52 GRB 061201 gB 22 08 32.060 -74 34 47.90           ~ 205 0
53 Fermi bn090510016 G 22 14 12.6230 -26 34 58.550           ~ 548 0
54 GRB 080123 gB 22 35 46.100 -64 54 03.24           ~ 98 0
55 GRB 100213A gB 23 17 34.04 +43 22 44.1           ~ 31 0

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