CSI Paul Lagabbe and Matteo Pracchia

vendredi 8 juil. 2022, 14:00 → 15:00 Europe/Paris

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