2016ApJ...822...68A

Query : 2016ApJ...822...68A

2016ApJ...822...68A - Astrophys. J., 822, 68-68 (2016/May-2)

Fermi LAT stacking analysis of Swift localized GRBs.

ACKERMANN M., AJELLO M., ANDERSON B., ATWOOD W.B., AXELSSON M., BALDINI L., BARBIELLINI G., BASTIERI D., BELLAZZINI R., BHAT P.N., BISSALDI E., BONINO R., BOTTACINI E., BRANDT T.J., BREGEON J., BRUEL P., BUEHLER R., BUSON S., CALIANDRO G.A., CAMERON R.A., CARAGIULO M., CARAVEO P.A., CECCHI C., CHARLES E., CHEKHTMAN A., CHIANG J., CHIARO G., CIPRINI S., CLAUS R., COHEN-TANUGI J., CONRAD J., CUTINI S., D'AMMANDO F., DE ANGELIS A., DE PALMA F., DESIANTE R., DI VENERE L., DRELL P.S., FAVUZZI C., FOCKE W.B., FRANCKOWIAK A., FUNK S., FUSCO P., GARGANO F., GASPARRINI D., GEHRELS N., GIGLIETTO N., GIORDANO F., GIROLETTI M., GODFREY G., GRENIER I.A., GROVE J.E., GUIRIEC S., HEWITT J.W., HILL A.B., HORAN D., JOHANNESSON G., KOCEVSKI D., KOUVELIOTOU C., KUSS M., LARSSON S., LI J., LI L., LONGO F., LOPARCO F., LOVELLETTE M.N., LUBRANO P., MAYER M., MAZZIOTTA M.N., McENERY J.E., MICHELSON P.F., MIZUNO T., MONZANI M.E., MORSELLI A., MURGIA S., NEMMEN R., NUSS E., OHNO M., OHSUGI T., OMODEI N., ORIENTI M., ORLANDO E., PANEQUE D., PERKINS J.S., PESCE-ROLLINS M., PIRON F., PIVATO G., PORTER T.A., RACUSIN J.L., RAINO S., RANDO R., RAZZANO M., REIMER A., REIMER O., SCHAAL M., SCHULZ A., SGRO C., SISKIND E.J., SPADA F., SPANDRE G., SPINELLI P., TAKAHASHI H., THAYER J.B., TIBALDO L., TINIVELLA M., TORRES D.F., TOSTI G., TROJA E., VIANELLO G., VON KIENLIN A., WERNER M. and WOOD K.S.

Abstract (from CDS):

We perform a comprehensive stacking analysis of data collected by the Fermi Large Area Telescope (LAT) of γ-ray bursts (GRBs) localized by the Swift spacecraft, which were not detected by the LAT but which fell within the instrument's field of view at the time of trigger. We examine a total of 79 GRBs by comparing the observed counts over a range of time intervals to that expected from designated background orbits, as well as by using a joint likelihood technique to model the expected distribution of stacked counts. We find strong evidence for subthreshold emission at MeV to GeV energies using both techniques. This observed excess is detected during intervals that include and exceed the durations typically characterizing the prompt emission observed at keV energies and lasts at least 2700 s after the co-aligned burst trigger. By utilizing a novel cumulative likelihood analysis, we find that although a burst's prompt γ-ray and afterglow X-ray flux both correlate with the strength of the subthreshold emission, the X-ray afterglow flux measured by Swift's X-ray Telescope at 11 hr post trigger correlates far more significantly. Overall, the extended nature of the subthreshold emission and its connection to the burst's afterglow brightness lend further support to the external forward shock origin of the late-time emission detected by the LAT. These results suggest that the extended high-energy emission observed by the LAT may be a relatively common feature but remains undetected in a majority of bursts owing to instrumental threshold effects.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): gamma-ray burst: general - γ rays: general - methods: data analysis - X-rays: bursts

Simbad objects: 83

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Number of rows : 83
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 bn100802240 gB 00 09 52.47 +47 45 19.1           ~ 61 0
2 Fermi bn110112934 gB 00 42 24 +64 24.4           ~ 23 0
3 Fermi bn090621185 gB 00 43 56.80 +61 56 17.6           ~ 59 0
4 SN 2010ma SN* 00 48 55.35 -34 33 59.5           SNIc 190 1
5 Fermi bn111117510 gB 00 50 46.220 +23 00 39.22           ~ 141 0
6 GRB 081016B gB 00 58 15.40 -43 31 48.0           ~ 22 0
7 GRB 081222 gB 01 30 57.76 -34 05 44.0           ~ 199 0
8 Fermi bn081226509 gB 01 42.0 -47 24           ~ 29 0
9 Fermi bn091208410 gB 01 57 38.50 +16 52 50.7           ~ 220 0
10 GRB 090728A gB 01 58 36.60 +41 37 59.6           ~ 2 0
11 Fermi bn081012549 gB 02 00 44 -17 37.6           ~ 43 0
12 Fermi bn090113778 gB 02 08 16.00 +33 26 08.4           ~ 92 0
13 SN 2009nz SN* 02 26 19.87 -18 57 08.6           ~ 307 1
14 Fermi bn100728439 gB 02 56 13.44 +00 16 51.6           ~ 142 0
15 GRB 111029A gB 02 59 08 +57 06.1           ~ 27 0
16 GRB 110825A gB 02 59.6 +15 24           ~ 33 0
17 PSO J047.1631+13.1580 G 03 08 39.14930640 +13 09 29.0253240           ~ 144 0
18 GRB 100902A gB 03 14 30 +30 58.2           ~ 68 0
19 Fermi bn091221870 gB 03 43 11.40 +23 14 28.0           ~ 66 0
20 GRB 110808A gB 03 49 04.28 -44 11 40.3           ~ 64 0
21 GRB 090407A gB 04 35 55.07 -12 40 45.1           ~ 4 0
22 Fermi bn090712160 gB 04 40 23.2 +22 31 29           ~ 31 0
23 GRB 100322B gB 05 05 57 +42 41.0           ~ 7 0
24 GRB 081118A gB 05 30 22.18 -43 18 05.3           ~ 3 0
25 Fermi bn100427356 gB 05 56 41 -03 27.7           ~ 25 0
26 GRB 110801A gB 05 57 44.87 +80 57 21.1           ~ 90 0
27 Fermi bn090709630 gB 06 14 05 +64 04.9           ~ 33 0
28 Fermi bn080928628 gB 06 20 16.85 -55 11 59.3           ~ 187 0
29 Fermi bn081101491 gB 06 23 20.70 -00 06 41.5           ~ 39 0
30 GRB 100203A gB 06 24 54.0 +04 47 33           ~ 11 0
31 GRB 110414A gB 06 31 29.43 +24 21 44.7           ~ 40 0
32 GRB 081104A gB 06 41 57.13 -54 43 11.6           ~ 1 0
33 SN 2010bh SN* 07 10 30.63 -56 15 19.7           SNIc 336 1
34 GRB 090831C gB 07 13 10.60 -25 06 44.0           ~ 30 0
35 GRB 100719A gB 07 29 17 -05 51.4           ~ 14 0
36 Fermi bn090518080 gB 07 59 50 +00 46.7           ~ 52 0
37 Fermi bn120118709 gB 08 19 29.05 -07 11 05.1           ~ 87 0
38 Fermi bn110412315 gB 08 53 58 +13 29.3           ~ 25 0
39 Fermi bn100704149 gB 08 54 33.92 -24 12 09.7           ~ 103 0
40 Fermi bn090516353 gB 09 12 59 -11 50.9           ~ 173 0
41 GRB 091202A gB 09 15 19.75 +62 32 59.0           ~ 2 0
42 Fermi bn090519881 gB 09 29 16.20 +00 11 23.9           ~ 98 0
43 Fermi bn090708152 gB 10 18 31.70 +26 36 58.7           ~ 33 0
44 Fermi bn101129652 gB 10 23 41 -17 38.7           ~ 34 0
45 GRB 080916B gB 10 54 31.60 +69 03 38.2           ~ 26 0
46 Fermi bn090117640 gB 10 56 01 -58 14.9           ~ 24 0
47 SN 2013cq SN* 11 32 32.84 +27 41 56.2           SNIc 613 1
48 GRB 090702A gB 11 43 35.39 +11 30 06.5           ~ 1 0
49 Fermi bn090323002 gB 12 42 50.28 +17 03 11.9           ~ 244 1
50 Fermi bn110128073 gB 12 55 35.10 +28 03 54.1           ~ 80 0
51 GRB 110903A gB 13 08 15.82 +58 58 53.8           ~ 30 0
52 Fermi bn090217206 gB 13 40 -08.4           ~ 56 0
53 GRB 090529A gB 14 09 52.56 +24 27 32.2           ~ 23 0
54 Fermi bn090813174 gB 15 00 15.60 +88 34 15.8           ~ 62 0
55 GRB 080906A gB 15 12 10.65 -80 31 03.2           ~ 2 0
56 GRB 081203B gB 15 15 11.7 +44 25 43           ~ 33 1
57 Fermi bn110102788 gB 16 23 31.41 +07 36 49.8           ~ 62 0
58 Fermi bn100111176 gB 16 28 11.60 +15 33 02.3           ~ 47 0
59 GRB 100418A gB 17 05 26.96 +11 27 41.9           ~ 198 0
60 GRB 081003A gB 17 29 33.80 +16 34 15.7           ~ 12 0
61 GRB 100614A gB 17 34 08.20 +49 13 56.4           ~ 45 0
62 Fermi bn090129880 gB 17 56 25.10 -32 47 34.8           ~ 36 0
63 Fermi bn081008832 gB 18 39 52.40 -57 25 58.8           ~ 224 0
64 Fermi bn110731465 gB 18 42 00.99 -28 32 13.8           ~ 193 0
65 Fermi bn080905499 G 19 10 42.0450 -18 52 54.510           ~ 200 0
66 Fermi bn100725475 gB 19 20 07 +76 57.3           ~ 55 0
67 Fermi bn111208353 gB 19 20 53.77 +40 40 34.4           ~ 20 0
68 Fermi bn100401297 gB 19 23 15 -08 15.4           ~ 26 0
69 GRB 110411A gB 19 25 46.13 +67 42 42.0           ~ 32 0
70 Fermi bn090422150 gB 19 38 59.92 +40 23 04.0           ~ 42 0
71 Fermi bn110107886 gB 19 59 38.22 +41 54 52.4           ~ 20 0
72 GRB 111212A gB 20 41 43.520 -68 36 45.00           ~ 22 0
73 GRB 100528A gB 20 44 29 +27 48.6           ~ 37 0
74 Fermi bn081126899 gB 21 34 03.54 +48 42 35.2           ~ 76 0
75 GRB 100514A gB 21 55 17 +29 10.2           ~ 26 0
76 Fermi bn081102739 gB 22 04 42.60 +52 59 27.7           ~ 60 0
77 GRB 081127A gB 22 08 15.45 +06 51 02.3           ~ 1 0
78 GRB 111204A gB 22 26 30.81 -31 22 29.3           ~ 21 0
79 GRB 110223A gB 23 03 22.68 +87 33 28.5           ~ 29 0
80 GRB 081029A gB 23 07 05.35 -68 09 19.8           ~ 5 0
81 GRB 081204A gB 23 19 09.45 -60 13 29.6           ~ 1 0
82 GRB 081109B gB 23 20 31.80 -55 54 42.8           ~ 7 0
83 Fermi bn100212588 gB 23 45 40.39 +49 29 39.6           ~ 56 0

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