2018A&A...613L...1D


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.20CET09:07:45

2018A&A...613L...1D - Astronomy and Astrophysics, volume 613, L1-1 (2018/5-1)

The evolution of the X-ray afterglow emission of GW 170817/ GRB 170817A in XMM-Newton observations.

D'AVANZO P., CAMPANA S., SALAFIA O.S., GHIRLANDA G., GHISELLINI G., MELANDRI A., BERNARDINI M.G., BRANCHESI M., CHASSANDE-MOTTIN E., COVINO S., D'ELIA V., NAVA L., SALVATERRA R., TAGLIAFERRI G. and VERGANI S.D.

Abstract (from CDS):

We report our observation of the short gamma-ray burst (GRB) GRB 170817A, associated to the binary neutron star merger gravitational wave (GW) event GW 170817, performed in the X-ray band with XMM-Newton 135d after the event (on 29 December, 2017). We find evidence for a flattening of the X-ray light curve with respect to the previously observed brightening. This is also supported by a nearly simultaneous optical Hubble Space Telescope observation and successive X-ray Chandra and low-frequency radio observations recently reported in the literature. Since the optical-to-X-ray spectral slope did not change with respect to previous observations, we exclude that the change in the temporal evolution of the light curve is due to the passage of the cooling frequency: its origin must be geometric or dynamical. We interpret all the existing afterglow data with two models: i) a structured jet and ii) a jet-less isotropic fireball with some stratification in its radial velocity structure. Both models fit the data and predict that the radio flux must decrease simultaneously with the optical and X-ray emission, making it difficult to distinguish between them at the present stage. Polarimetric measurements and the rate of short GRB-GW associations in future LIGO/Virgo runs will be key to disentangle these two geometrically different scenarios.

Abstract Copyright: © ESO 2018

Journal keyword(s): gravitational waves - gamma rays: general

CDS comments: Paragraph 2 : S2 not in SIMBAD.

Simbad objects: 2

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Number of rows : 2

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 NGC 4993 GiG 13 09 47.706 -23 23 01.79   13.34   11.92   ~ 192 0
2 GrW 170817 GWE 13 09 48.0850 -23 22 53.343           ~ 548 0

    Equat.    Gal    SGal    Ecl

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2019.11.20-09:07:45

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