Search for Transient Gravitational-Wave Signals Associated with Magnetar Bursts during Advanced LIGO's Second Observing Run
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 (hrss) from incoming intermediate-duration gravitational waves ranging from 1.1 x10-22 at 150 Hz to 4.4 x 10-222 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 x1044 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 x1044 erg for short white noise bursts, and 2.3 x1047 erg for 100 ms long ringdowns at 1500 Hz, both at 50% detection efficiency.
B. P. Abbott et al., "Search for Transient Gravitational-Wave Signals Associated with Magnetar Bursts during Advanced LIGO's Second Observing Run," Astrophysical Journal, vol. 874, no. 2, Institute of Physics - IOP Publishing, Apr 2019.
The definitive version is available at https://doi.org/10.3847/1538-4357/ab0e15
Keywords and Phrases
gravitational waves; stars: magnetars
International Standard Serial Number (ISSN)
Article - Journal
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01 Apr 2019