Search for transient gravitational-wave signals associated with magnetar bursts during Advanced LIGO's second observing run

B. P. Abbott, R. Birney, N. A. Lockerbie, S. Macfoy, S. Reid

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Abstract

We present the results of a search for short- and intermediate-duration gravitational-wave signals from four magnetar bursts in Advanced LIGO's second observing run. We find no evidence of a signal and set upper bounds on the root sum squared of the total dimensionless strain (h rss) from incoming intermediate-duration gravitational waves ranging from 1.1 × 10−22 at 150 Hz to 4.4 × 10−22 at 1550 Hz at 50% detection efficiency. From the known distance to the magnetar SGR 1806–20 (8.7 kpc), we can place upper bounds on the isotropic gravitational-wave energy of 3.4 × 1044 erg at 150 Hz assuming optimal orientation. This represents an improvement of about a factor of 10 in strain sensitivity from the previous search for such signals, conducted during initial LIGO's sixth science run. The short-duration search yielded upper limits of 2.1 × 1044 erg for short white noise bursts, and 2.3 × 1047 erg for 100 ms long ringdowns at 1500 Hz, both at 50% detection efficiency.
Original languageEnglish
Article number163
Number of pages14
JournalAstrophysical Journal
Volume874
Issue number2
DOIs
Publication statusPublished - 4 Apr 2019

Keywords

  • gravitational waves
  • magnetars
  • LIGO
  • neutron stars
  • soft gamma repeaters

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