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GCN Circular 22211

Subject
LIGO/Virgo GW170817: X-ray observations confirm prediction made from radio data
Date
2017-12-08T21:30:16Z (6 years ago)
From
Kunal Mooley at Oxford U <kunal.mooley@physics.ox.ac.uk>
K. P. Mooley (Oxford, NRAO/Caltech) et al. report

The X-ray flux of GW170817 on December 03-06 (reported by Troja et al. 
2017, GCN 22201; Margutti et al. 2017, GCN 22203, Haggard et al. 2017, 
GCN 22206 based on the Chandra observations) is exactly as predicted 
last week by Mooley et al. 2017 (http://arxiv.org/abs/1711.11573) based 
on radio spectral indices.

This suggests that the radio and X-ray emission both arise from a mildly 
relativistic wide-angle outflow, consistent with the cocoon model (see 
also Gottlieb et al. 2017, Hallinan et al. 2017, Kasliwal et al. 2017). 
A relativistic jet core, if it exists, is either too weak (having a 
sub-dominant contribution to the radio light curve early on) or too 
strong (such that its electromagnetic signatures will be observed in the 
future). See Mooley et al. 2017 for details.
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