2018MNRAS.475.1708A

Query : 2018MNRAS.475.1708A

2018MNRAS.475.1708A - Mon. Not. R. Astron. Soc., 475, 1708-1724 (2018/April-1)

Clustering of gamma-ray burst types in the Fermi GBM catalogue: indications of photosphere and synchrotron emissions during the prompt phase.

ACUNER Z. and RYDE F.

Abstract (from CDS):

Many different physical processes have been suggested to explain the prompt gamma-ray emission in gamma-ray bursts (GRBs). Although there are examples of both bursts with photospheric and synchrotron emission origins, these distinct spectral appearances have not been generalized to large samples of GRBs. Here, we search for signatures of the different emission mechanisms in the full Fermi Gamma-ray Space Telescope/GBM (Gamma-ray Burst Monitor) catalogue. We use Gaussian Mixture Models to cluster bursts according to their parameters from the Band function (α, β, and Epk) as well as their fluence and T90. We find five distinct clusters. We further argue that these clusters can be divided into bursts of photospheric origin (2/3 of all bursts, divided into three clusters) and bursts of synchrotron origin (1/3 of all bursts, divided into two clusters). For instance, the cluster that contains predominantly short bursts is consistent of photospheric emission origin. We discuss several reasons that can determine which cluster a burst belongs to: jet dissipation pattern and/or the jet content, or viewing angle.

Abstract Copyright: © 2017 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): gamma-ray burst: individual

Simbad objects: 59

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Number of rows : 59
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 bn090428552 gB 00 03 +11.5           ~ 14 0
2 Fermi bn110204179 gB 00 07 -17.4           ~ 8 0
3 GRB 100625A gB 01 03 10.98 -39 05 18.3           ~ 124 0
4 Fermi bn110921912 gB 01 12 -27.8           ~ 17 0
5 Fermi bn100805300 gB 01 31 +34.2           ~ 8 0
6 GRB 101014A gB 01 47.8 -51 04           ~ 31 0
7 SN 2009nz SN* 02 26 19.87 -18 57 08.6           ~ 307 1
8 Fermi bn110528624 gB 02 59 -06.9           ~ 10 0
9 PSO J047.1631+13.1580 G 03 08 39.14930640 +13 09 29.0253240           ~ 144 0
10 Fermi bn120210650 gB 03 39 -58.5           ~ 9 0
11 GRB 100612A gB 04 14 +13.7           ~ 17 0
12 GRB 090617 gB 05 15.6 +15 39           ~ 26 0
13 Fermi bn090709630 gB 06 14 05 +64 04.9           ~ 33 0
14 Fermi bn120711115 gB 06 18 42.839 -70 59 56.78           ~ 125 0
15 Fermi bn120122300 gB 06 26 +16.5           ~ 8 0
16 Fermi bn131014215 gB 06 41 12.80 -19 05 49.6           ~ 50 0
17 Fermi bn100517072 gB 06 44 -29.0           ~ 14 0
18 Fermi bn100201588 gB 07 43 -54.4           ~ 14 0
19 GRB 080916C gB 07 59 23.24 -56 38 16.8           ~ 386 0
20 Fermi bn120710100 gB 08 02 -31.1           ~ 9 0
21 GRB 081215A gB 08 22 +54.0           ~ 57 0
22 Fermi bn090804940 gB 08 42 -11.3           ~ 21 0
23 Fermi bn101016243 gB 08 52 -04.6           ~ 9 0
24 Fermi bn091026485 gB 09 08 -23.6           ~ 11 0
25 Fermi bn110819665 gB 09 18 -76.6           ~ 8 0
26 Fermi bn111228657 gB 10 00 16.04 +18 17 52.2           ~ 201 0
27 GRB 080817 gB 10 05 09.600 -19 15 36.00           ~ 27 0
28 Fermi bn100216422 gB 10 17 03 +35 31.0           ~ 32 0
29 Fermi bn120624933 gB 11 23 31.98 +08 55 42.1           ~ 100 0
30 Fermi bn120506128 gB 11 29 -33.7           ~ 7 0
31 Fermi bn100907751 gB 11 49 -40.6           ~ 8 0
32 GRB 101204B gB 12 48 +55.7           ~ 11 0
33 Fermi bn100414097 gB 12 48 30.0 +08 41 35           ~ 136 0
34 GRB 100724A gB 12 58 10.38 -11 06 09.3           ~ 198 0
35 Fermi bn110411629 gB 14 01 -65.0           ~ 8 0
36 Fermi bn091017861 gB 14 03 +25.5           ~ 11 0
37 GRB 081224 gB 14 12 35.85 +74 11 59.5           ~ 27 0
38 Fermi bn110426629 gB 14 40 -08.7           ~ 14 0
39 GRB 120427A gB 15 00 +29.3           ~ 15 0
40 Fermi bn110409179 gB 15 55 -34.3           ~ 9 0
41 GRB 130606A gB 16 37 35.12 +29 47 46.4           ~ 185 0
42 Fermi bn101026034 gB 17 35 -00.4           ~ 10 0
43 Fermi bn151027166 gB 18 09 56.87 +61 21 12.3           ~ 143 0
44 Fermi bn091215234 gB 18 53 +17.5           ~ 13 0
45 GRB 100826A gB 18 56 -23.2           ~ 79 0
46 Fermi bn101216721 gB 18 57 -21.0           ~ 16 0
47 GRB 090618 gB 19 36 01.80 +78 21 07.1           ~ 358 0
48 GRB 110803A gB 20 02 -11.4           ~ 8 0
49 GRB 100918A gB 20 34 -46.0           ~ 15 0
50 Fermi bn110717180 gB 20 34 -07.8           ~ 12 0
51 Fermi bn110818860 gB 21 09 20.890 -63 58 51.80           ~ 92 0
52 GRB 110721A gB 22 10 -38.6           ~ 155 0
53 Fermi bn120102416 gB 22 44 -23.2           ~ 8 0
54 GRB 090719 gB 22 45 -67.9           ~ 41 0
55 Fermi bn100707032 gB 23 24 -06.6           ~ 44 0
56 Fermi bn100816026 gB 23 26 57.56 +26 34 42.6           ~ 170 0
57 GRB 100612B gB 23 28 -01.8           ~ 23 0
58 Fermi bn081206604 gB 23 33 -31.9           ~ 12 0
59 Fermi bn090926181 gB 23 33 36.18 -66 19 25.9           ~ 339 0

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