2025ApJ...979...11X

Query : 2025ApJ...979...11X

2025ApJ...979...11X - Astrophys. J., 979, 11 (2025/January-3)

Constraining the Gamma-Ray Burst Jet Opening Angle Based on the Very Steep Decay Phase.

XU Q., LIU D.-J. and ZOU Y.-C.

Abstract (from CDS):

Thanks to the rapid follow-up observations by the Swift X-Ray Telescope (XRT), a good part of gamma-ray bursts' (GRBs) high-latitude emission have been observed in the X-ray band. Some even show a dropdown decay after this period, which strongly indicates the edge of the jet is corresponding to the breaking time. This study constrains the jet opening angles of GRBs by analyzing the very steep decay phase in the early X-ray afterglow. Using data from Swift/XRT, we identified GRBs with significant breaks in their light curves and applied a broken power-law model to describe the decay phases. Assuming a spherical and isotropic emitting surface, we set constraints on the radiation radius (Rγ) to estimate jet opening angles (θjet) from the breaking time. Our results indicate that jet opening angles can be constrained, although they are sensitive to the assumed radiation radius. This approach provides yet another method for estimating GRB jet opening angles.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Gamma-ray bursts - Relativistic jets

Simbad objects: 45

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Number of rows : 45
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 SN 2010ma SN* 00 48 55.35 -34 33 59.5           SNIc 190 1
2 Fermi bn081221681 gB 01 03 10.2 -24 32 53           ~ 186 0
3 GRB 160412A gB 02 12 11.06 -67 37 36.7           ~ 16 0
4 GRB 060202 gB 02 23 22.940 +38 23 03.70           ~ 102 0
5 GRB 081230 gB 02 29 19.20 -25 08 42.6           ~ 50 0
6 GRB 071227A G 03 52 31.0260 -55 59 00.890           ~ 201 0
7 Fermi bn180314030 gB 06 37 03.66 -24 29 46.5           ~ 46 0
8 GRB 041223 gB 06 40 47.39 -37 04 22.6           ~ 45 0
9 GRB 210421A gB 06 59 29.86 +04 55 20.0           ~ 11 0
10 GRB 181203A gB 07 13 23.62 -39 48 06.7           ~ 11 0
11 GRB 120219A gB 08 39 09.75 +51 01 54.3           ~ 30 0
12 GRB 210912A gB 08 39 34.16 +79 13 15.9           ~ 15 0
13 Fermi bn171007498 gB 09 02 24.14 +42 49 08.9           ~ 15 0
14 GRB 171209A gB 09 17 36.66 -30 31 12.5           ~ 17 0
15 GRB 210818A gB 09 55 28.98 -87 01 33.5           ~ 13 0
16 GRB 111123A gB 10 19 23.17 -20 38 41.9           ~ 83 0
17 GRB 230420A gB 10 44 11.56 +32 06 27.6           ~ 16 0
18 Fermi bn101030664 gB 11 05 34.0 -16 23 11           ~ 35 0
19 GRB 100725A gB 11 05 55.59 -26 40 12.6           ~ 31 0
20 Fermi bn121031949 gB 11 23 04.85 -03 31 01.3           ~ 33 0
21 GRB 080613B gB 11 35 11.51 -07 06 17.5           ~ 51 0
22 GRB 170127A gB 11 37 26.51 -45 50 09.6           ~ 16 0
23 GRB 160313A gB 12 15 11.19 +57 17 01.0           ~ 22 0
24 GRB 190219A gB 12 38 30.44 +76 36 44.9           ~ 18 0
25 GRB 210725A gB 14 21 29.82 -01 11 33.6           ~ 12 0
26 GRB 120308A gB 14 36 20.02 +79 41 12.0           ~ 79 0
27 Fermi bn160804065 gB 14 46 31.20 +09 59 56.1           ~ 79 0
28 GRB 080721A gB 14 57 55.76 -11 43 24.9           ~ 180 0
29 GRB 060428B gB 15 41 25.570 +62 01 28.93 20.64 20.62 19.50     ~ 71 0
30 GRB 090404 gB 15 56 55.80 +35 31 03.4           ~ 79 0
31 GRB 060502A gB 16 03 42.480 +66 36 02.49     18.65     ~ 143 0
32 UGCS J162444.39-273226.8 G 16 24 44.38275 -27 32 26.8381     19.70     ~ 469 1
33 GRB 050814 gB 17 36 45.390 +46 20 21.60           ~ 166 0
34 Fermi bn120326056 gB 18 15 37.06 +69 15 35.4           ~ 188 0
35 GRB 160501A gB 19 05 32.23 -17 14 29.4           ~ 20 0
36 GRB 080503 gB 19 06 28.74 +68 47 35.8           ~ 172 0
37 GRB 150428B gB 19 30 33.46 +04 07 31.8           ~ 23 0
38 GRB 100425A gB 19 56 47.16 -26 25 50.5           ~ 91 0
39 GRB 120213A gB 20 04 02.83 +65 24 40.6           ~ 37 0
40 GRB 180925A gB 21 00 48.71 -64 27 23.8           ~ 17 0
41 GRB 080123 gB 22 35 46.100 -64 54 03.24           ~ 98 0
42 Fermi bn200219317 G 22 50 33.1080 -59 07 11.579           ~ 42 0
43 Fermi bn151228949 gB 22 57 41.87 +08 04 53.7           ~ 17 0
44 GRB 231129A gB ~ ~           ~ 13 0
45 GRB 231230A gB ~ ~           ~ 12 0

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