2012ApJ...745...72Z

Query : 2012ApJ...745...72Z

2012ApJ...745...72Z - Astrophys. J., 745, 72 (2012/January-3)

Faint high-energy gamma-ray photon emission of GRB 081006A from Fermi observations.

ZHENG W., AKERLOF C.W., PANDEY S.B., McKAY T.A., ZHANG B. and ZHANG B.

Abstract (from CDS):

Since the launch of the Fermi Gamma-ray Space Telescope on 2008 June 11, the Large Area Telescope (LAT) instrument has firmly detected more than 20 gamma-ray bursts (GRBs) with high-energy photon emission above 100 MeV. Using the matched filter technique, three more GRBs have also shown evidence of correlation with high-energy photon emission as demonstrated by Akerlof et al. In this paper, we present another GRB, GRB 081006A, unambiguously detected by the matched filter technique. This event is associated with more than 13 high-energy photons above 100 MeV. The likelihood analysis code provided by the Fermi Science Support Center generated an independent verification of this detection using a comparison of the test statistics value with similar calculations for random LAT data fields. We have performed detailed temporal and spectral analysis of photons from 8 keV up to 0.8 GeV from the Gamma-ray Burst Monitor and the LAT. The properties of GRB 081006A can be compared to those of the other two long-duration GRBs detected at similar significance, GRB 080825C and GRB 090217A. We find that GRB 081006A is more similar to GRB 080825C with comparable appearances of late high-energy photon emission. As demonstrated previously, there appears to be a surprising dearth of faint LAT GRBs, with only one additional GRB identified in a sample of 74. In this unique period when both Swift and Fermi are operational, there is some urgency to explore this aspect of GRBs as fully as possible.

Abstract Copyright: ∼

Journal keyword(s): gamma-ray burst: individual: GRB 081006A

CDS comments: In table 1, GRB 100517B is GRB 100517C (= bn100517132) in SIMBAD, GRB 091231B is GRB 091231A in SIMBAD (= bn091231206) and GRB 100516A is NAME bn100516014; see Fermi/GBM catalogs (J/ApJS/199/18 and J/ApJS/211/13).

Simbad objects: 85

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Number of rows : 85
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 Fermi bn090703329 gB 00 03 +09.7           ~ 14 0
2 Fermi bn090629543 gB 00 33.9 +17 40           ~ 10 0
3 Fermi bn091207333 gB 00 51 -50.2           ~ 12 0
4 Fermi bn090625234 gB 01 21.2 -06 26           ~ 14 0
5 Fermi bn090308734 gB 01 27.6 -54 18           ~ 21 0
6 Fermi bn081226509 gB 01 42.0 -47 24           ~ 29 0
7 Fermi bn091208410 gB 01 57 38.50 +16 52 50.7           ~ 220 0
8 Fermi bn100608382 gB 02 02.2 +20 27           ~ 10 0
9 Fermi bn100517132 gB 02 42.5 -44 19           ~ 10 0
10 Fermi bn091002685 gB 02 44.0 -13 06           ~ 10 0
11 Fermi bn090623913 gB 02 46.8 +01 48           ~ 12 0
12 Fermi bn090819607 gB 03 16.4 -67 06           ~ 12 0
13 Fermi bn081107321 gB 03 24.0 +17 06           ~ 21 0
14 Fermi bn081118876 gB 03 38.4 -43 18           ~ 15 0
15 GRB 080822A gB 04 14.4 +25 48           ~ 2 0
16 GRB 090815C gB 04 17 57 -65 57.0           ~ 19 0
17 Fermi bn090403314 gB 04 28.4 +47 12           ~ 17 0
18 Fermi bn100101988 gB 04 42.6 +18 41           ~ 13 0
19 GRB 090617 gB 05 15.6 +15 39           ~ 26 0
20 Fermi bn100620119 gB 05 20.4 -51 41           ~ 13 0
21 Fermi bn090907808 gB 05 24.4 +20 30           ~ 14 0
22 Fermi bn100429999 gB 05 56.4 -69 58           ~ 11 0
23 Fermi bn100427356 gB 05 56 41 -03 27.7           ~ 25 0
24 Fermi bn100517072 gB 06 44 -29.0           ~ 14 0
25 Fermi bn090519462 gB 07 04 -56.7           ~ 16 0
26 GRB 090228 gB 07 07.2 -24 18           ~ 45 0
27 Fermi bn100301068 gB 07 20.6 -15 41           ~ 11 0
28 Fermi bn081223419 gB 07 30.0 +33 12           ~ 18 0
29 Fermi bn090701225 gB 07 38.8 -42 04           ~ 14 0
30 Fermi bn100201588 gB 07 43 -54.4           ~ 14 0
31 NAME bn100516014 gB 07 49.3 +55 08           ~ 1 0
32 GRB 080916C gB 07 59 23.24 -56 38 16.8           ~ 386 0
33 Fermi bn080920268 gB 08 06.4 +08 54           ~ 12 0
34 Fermi bn080824909 gB 08 09.6 -02 48           ~ 16 0
35 Fermi bn090429753 gB 08 21 +06.2           ~ 22 0
36 GRB 100212B gB 08 57.1 +32 13           ~ 15 0
37 GRB 090305B gB 09 00.0 +74 18           ~ 22 0
38 Fermi bn090306245 gB 09 08.0 +57 00           ~ 14 0
39 Fermi bn090826068 gB 09 22.5 -00 07           ~ 16 0
40 Fermi bn081006604 gB 09 28.0 -67 24           ~ 25 0
41 GRB 081229 gB 11 22 +55.1           ~ 4 0
42 Fermi bn081006872 gB 11 28.8 -61 00           ~ 14 0
43 Fermi bn090309767 gB 11 37.2 -49 30           ~ 13 0
44 Fermi bn091107635 gB 12 10 +38.9           ~ 12 0
45 Fermi bn100313509 gB 12 25.5 +11 43           ~ 9 0
46 Fermi bn090126227 gB 12 36.8 +34 06           ~ 15 0
47 Fermi bn081226156 gB 12 52.0 +26 48           ~ 15 0
48 Fermi bn091231206 gB 13 08.4 -55 57           ~ 14 0
49 Fermi bn091223191 gB 13 32.9 +76 21           ~ 12 0
50 Fermi bn090217206 gB 13 40 -08.4           ~ 56 0
51 Fermi bn090706283 gB 13 40.3 -47 04           ~ 13 0
52 Fermi bn100218194 gB 13 46.6 -11 56           ~ 15 0
53 Fermi bn081230871 gB 13 50.4 -17 18           ~ 13 0
54 Fermi bn100315361 gB 13 55.6 +30 08           ~ 12 0
55 Fermi bn100325246 gB 13 56.6 -79 06           ~ 12 0
56 Fermi bn090331681 gB 14 02.0 +03 06           ~ 14 0
57 GRB 081224 gB 14 12 35.85 +74 11 59.5           ~ 27 0
58 Fermi bn091017985 gB 14 18 -64.7           ~ 11 0
59 Fermi bn090917661 gB 15 21 -11.7           ~ 12 0
60 Fermi bn090529310 gB 15 24.8 +32 12           ~ 15 0
61 GRB 080825C gB 15 28.8 -04 54           ~ 71 0
62 Fermi bn090726218 gB 15 54.8 +32 30           ~ 11 0
63 Fermi bn091231540 gB 16 05 +03.3           ~ 9 0
64 Fermi bn090718720 gB 16 15.0 -06 41           ~ 12 0
65 GRB 090717B gB 16 27.8 +22 58           ~ 15 0
66 Fermi bn091109895 gB 16 30.9 +42 19           ~ 14 0
67 GRB 090207 gB 16 50.8 +34 54           ~ 19 0
68 Fermi bn100417166 gB 17 25.2 +50 23           ~ 10 0
69 Fermi bn090902462 gB 17 39 45.26 +27 19 28.1           ~ 440 0
70 Fermi bn090413122 gB 17 46.0 -09 12           ~ 13 0
71 Fermi bn100605774 gB 18 13.7 -67 36           ~ 10 0
72 Fermi bn091115177 gB 18 37.5 +68 02           ~ 13 0
73 Fermi bn080905499 G 19 10 42.0450 -18 52 54.510           ~ 200 0
74 Fermi bn100401297 gB 19 23 15 -08 15.4           ~ 26 0
75 Fermi bn091219462 gB 19 38.0 +71 55           ~ 12 0
76 Fermi bn090820509 gB 21 13 -18.6           ~ 18 0
77 Fermi bn080805496 gB 21 30.8 +47 54           ~ 11 0
78 Fermi bn081024891 gB 21 31 36.00 +21 12 14.4           ~ 91 0
79 Fermi bn100330856 gB 21 45.5 -06 58           ~ 8 0
80 Fermi bn090807832 gB 21 47.6 +07 14           ~ 15 0
81 Fermi bn090213236 gB 22 02.4 -55 00           ~ 11 0
82 Fermi bn090510016 G 22 14 12.6230 -26 34 58.550           ~ 548 0
83 Fermi bn100625891 gB 22 33.0 +20 17           ~ 13 0
84 GRB 091024B gB 22 37.0 +56 53           ~ 1 0
85 Fermi bn090228976 gB 23 50.4 +36 42           ~ 15 0

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