Searches for generic GW transients

Not all the astrophysical processes are well modeled like the CBCs. Supernova explosions, for instance, are characterized by so many different scenarios that it is difficult (and computationally expensive) to provide an exhaustive modelling. For this reason, not-modeled searches are needed to cover the most wide range of possible sources.

Coherent WaveBurst (cWB) is the general pipeline used by LIGO-Virgo for the search of unmodeled transients. <ref>hello</ref> S. Klimenko, G. Vedovato, M. Drago et al., "Method for detection and reconstruction of gravitational wave transients with networks of advanced detectors", Phys. Rev. D 93, 042004 (2016)

cWB can be targeted to various search flavor, for more specific see the Manual.

Search for not modeled signals can be summarized in the following aspects:

• Detection. Distinguish the real signal from detector noise. This includes two aspects:
  • Background characterization, the standard technique includes time-shift analyses between multiple detector so to characterize the coincidence rate due to noise in the no-shifted analysis.
  • Artifacts cleaning, identification and cleaning of noise artifacts preserving the information from eventual GW presence. The standard procedure adopted by CWB is described in: V. Tiwari, M. Drago et al. "Regression of Environmental Noise in LIGO Data", Class. Quant. Grav., 32(16):165014, 2015.

• Source identification. The waveform reconstruction is fundamental to establish the generating process. Some studies:
  • F. Salemi, E. Milotti, G. A. Prodi, G. Vedovato, C. Lazzaro, S. Tiwari, S. Vinciguerra, M. Drago, S. Klimenko, "A wider look at the gravitational-wave transients from GWTC-1 using an unmodeled reconstruction method", Phys. Rev. D 100, 042003 (2019)
  • P. Astone, P. Cerdá-Durán, I. Di Palma, M. Drago, F. Muciaccia, C. Palomba, and F. Ricci, "New method to observe gravitational waves emitted by core collapse supernovae", Phys. Rev., D98(12):122002, 2018.
  • I. Di Palma, M. Drago, "Estimation of the gravitational wave polarizations from a non template search", Phys. Rev. D 97, 023011 (2018)
  • S. Vinciguerra, M. Drago, et al., "Enhancing the significance of gravitational wave bursts through signal classification", Class. Quant. Grav., 34(9):094003, 201

• Sky localization. Fundamental for Multi-Messenger Astronomy.
  • S. Klimenko, G. Vedovato, M. Drago, et al., "Localization of gravitational wave sources with networks of advanced detectors", Phys. Rev., D83:102001, 2011.