2018RAA....18...43H


C.D.S. - SIMBAD4 rel 1.7 - 2020.03.29CET00:44:21

2018RAA....18...43H - Research in Astron. and astroph., 18, 43-43 (2018/April-0)

GRB 170817A: a short GRB seen off-axis.

HE X.-B., TAM P.-H.T. and SHEN R.-F.

Abstract (from CDS):

The angular distribution of gamma-ray burst (GRB) jets is not yet clear. The observed luminosity of GRB 170817A is the lowest among all known short GRBs, which is best explained by the fact that our line of sight is outside of the jet opening angle, θobs > θj, where θobs is the angle between our line of sight and the jet axis. As inferred by gravitational wave observations, as well as radio and X-ray afterglow modeling of GRB 170817A, it is likely that θobs ∼ 20° - 28°. In this work, we quantitatively consider two scenarios of angular energy distribution of GRB ejecta: a top-hat jet and a structured jet with a power law index s. For the top-hat jet model, we get a large θj (e.g., θj >10°), a rather high local (i.e., z < 0.01) short GRB rate ∼8-15x103 Gpc–3 yr–1 (estimated to be 90∼1850 Gpc–3 yr–1 in Fong et al.) and an extremely high Epeak,0 (on-axis, rest-frame)>7.5x104 keV (∼500 keV for a typical short GRB). For the structured jet model, we use θobs to give limits on s and θj for typical on-axis luminosity of a short GRB (e.g., 1049 erg s–1 ∼1051 erg s–1), and a low on-axis luminosity case (e.g., 1049 erg s–1) gives more reasonable values of s. The structured jet model is more feasible for GRB 170817A than the top-hat jet model due to the rather high local short GRB rate, and the extremely high on-axis Epeak,0 almost rules out the top-hat jet model. GRB 170817A is likely a low on-axis luminosity GRB (1049 erg s–1) with a structured jet.

Abstract Copyright:

Journal keyword(s): short gamma-ray burst: individual: (GRB 170817A) - gravitational wave

Status at CDS:  

Simbad objects: 7

goto Full paper

goto View the reference in ADS

Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 SN 2006aj SN* 03 21 39.670 +16 52 02.27 17.96 19.11 17.40     SNIc-BL 817 1
2 GRB 130603B gB 11 28 48.16 +17 04 18.2           ~ 254 0
3 NGC 4993 GiG 13 09 47.706 -23 23 01.79   13.34   11.92   ~ 208 0
4 GrW 170817 GWE 13 09 48.0850 -23 22 53.343           ~ 675 0
5 SN 1998bw SN* 19 35 03.17 -52 50 46.1   14.09       SNIc 1632 2
6 GRB 060614 gB 21 23 32.140 -53 01 36.10 18.89 20.12 19.54     ~ 493 1
7 GRB 050709 gB 23 01 26.960 -38 58 39.50           ~ 251 1

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2018RAA....18...43H and select 'bookmark this link' or equivalent in the popup menu


2020.03.29-00:44:21

© Université de Strasbourg/CNRS

    • Contact