Name: CSI Paul Lagabbe and Matteo Pracchia
Start: 2022-07-08T14:00:00+02:00
End: 2022-07-08T15:00:00+02:00
Location: No location set

- 1
  
  Paul Lagabbe
  
  Calibration of Advanced Virgo+ and verification of the reconstructed gravitational wave signal with a photon calibrator
  
  To reconstruct the strain signal hrec, models of the interferometer response, and
  of the mirror electromagnetic actuators response are needed.
  The photon calibrator give the mirror a known motion thanks to the radiation
  pressure of an auxiliary laser. The motion of the mirror is computed with the
  power of the laser reflected by the mirror. This power is estimated by
  photodiodes which measure a pickoff of the laser.
  Thus, the powers of these pickoffs should be proportional to reflected power, and the photo-
  diodes need to be absolutely calibrated. The photodiodes are calibrated with respect
  to standard power sensors, the integrating spheres. The timing of the PCal also has
  to be measured.
  
  Orateur: Paul Lagabbe (LAPP)
  
  Seminaire_2022-07-08.pdf
- 2
  
  Matteo Pracchia
  
  We perform a joint gravitational waves/gamma-ray bursts (GW/GRB) Bayesian analysis in order
  to put constraints on the low-luminosity end of the short gamma-ray burst (sGRB) population. For
  this purpose we exploit the results of the modeled search for GW transients associated to short and
  ambiguous GRBs detected during the first three observing run LIGO/Virgo network and a broken
  power law to describe the luminosity function of our sGRB population. We use then the results
  obtained to have an estimate of the rate distribution of the low-luminosity sGRB population and
  on the joint detection rate between sGRB and GW for the next two future runs.
  
  Orateur: Matteo Pracchia (LAPP)
  
  typ_220708.pdf