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GCN Circular 21787

Subject
LIGO/Virgo G298048: Chandra monitoring of the X-ray emission from SSS17a
Date
2017-09-02T17:06:21Z (7 years ago)
From
Eleonora Troja at GSFC/Swift <nora.gsfc@gmail.com>
E. Troja (UMD/GSFC), L. Piro (INAF/IAPS), T. Sakamoto (AGU),
S. B. Cenko (NASA/GSFC), and A. Lien (UMBC/GSFC) report on behalf
of a larger collaboration:

We re-observed the field of SSS17a (Coulter et al., LVC GCN 21529) with
the Chandra X-ray Observatory (PI: E. Troja) on 2017-09-01
(~15 days after the LVC trigger) for a total exposure of 47 ks.

The X-ray source reported in Troja et al. (LVC GCN 21765) is still
detected.
At the position of the optical/IR transient we measure ~17 net counts.
By describing the spectrum with an absorbed power-law we estimate a flux
of approximately 4.5E-15 erg/cm2/s (0.5-8.0 keV).

We thank Belinda Wilkes and the entire Chandra team for approving and
scheduling these observations.
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