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Title: HIGH-ENERGY ELECTROMAGNETIC OFFLINE FOLLOW-UP OF LIGO-VIRGO GRAVITATIONAL-WAVE BINARY COALESCENCE CANDIDATE EVENTS

We present two different search methods for electromagnetic counterparts to gravitational-wave (GW) events from ground-based detectors using archival NASA high-energy data from the Fermi Gamma-ray Burst Monitor (GBM) and RXTE All-sky Monitor (ASM) instruments. To demonstrate the methods, we use a limited number of representative GW background noise events produced by a search for binary neutron star coalescence over the last two months of the LIGO-Virgo S6/VSR3 joint science run. Time and sky location provided by the GW data trigger a targeted search in the high-energy photon data. We use two custom pipelines: one to search for prompt gamma-ray counterparts in GBM, and the other to search for a variety of X-ray afterglow model signals in ASM. We measure the efficiency of the joint pipelines to weak gamma-ray burst counterparts, and a family of model X-ray afterglows. By requiring a detectable signal in either electromagnetic instrument coincident with a GW event, we are able to reject a large majority of GW candidates. This reduces the signal-to-noise ratio of the loudest surviving GW background event by around 15–20%.
Authors:
;  [1] ; ; ;  [2] ;  [3] ;  [4] ;  [5]
  1. NASA/Goddard Space Flight Center, Greenbelt, MD (United States)
  2. University of Alabama in Huntsville, Huntsville, AL (United States)
  3. Carleton College, Northfield, MN (United States)
  4. Massachussetts Institute of Technology, Cambridge, MA (United States)
  5. University of Birmingham, Birmingham (United Kingdom)
Publication Date:
OSTI Identifier:
22520081
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal, Supplement Series; Journal Volume: 217; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AFTERGLOW; BACKGROUND NOISE; COALESCENCE; COSMIC GAMMA BURSTS; EFFICIENCY; GAMMA RADIATION; GRAVITATIONAL WAVES; NEUTRON STARS; SIGNAL-TO-NOISE RATIO; SKY