Departmental Seminar

Subpopulation of short GRBs: from Gravitational Waves follow up to kilonovae detection

Dr Karelle Siellez
University of California Santa Cruz

The first direct observation of the coalescence of two neutron stars exceeded expectations. Between the detection of the gravitational waves GW170817, the electromagnetic afterglow emission from the short gamma ray burst GRB170817A and the optical kilonova observations, the "breakthrough discovery of 2017" has wide opened the multi-messenger era in Astrophysics. 

After reviewing this amazing discovery, I will show the existence of a new subpopulation of short GRB low luminous at low redshift that could give us more coincidence with GW in the next run of advanced LIGO and Virgo. I will discuss the new rate of expected coalescences, and the properties of the progenitors that are supposed to produce those GRBs. I will then present the different methods used to achieve this goal, and especially the one that I developed with the GBM Fermi team, using subthreshold untargeted GRBs as trigger to find GW in coincidence. I will finally conclude regarding optical follow up to find more kilonovae as well as the implications on jet model. 

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