Seminario J. Rana

Dettagli dell'evento


dalle 14:30 alle 15:30


Stanza 300, Blocco C

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Il giorno 25 settembre alle ore 14,30 presso la stanza C300, Javed Rana (Inter-University Centre for Astronomy and Astrophysics, Pune, India.) terra' un seminario dal titolo

Follow-up strategies of large GW sky-localization by electromagnetic telescopes and the early alert to electromagnetic followers.


A wide range of outcomes is expected from binary neutron star (BNS) mergers, based on the total mass of the binary system, the mass ratio and the neutron star equation of state. Detection of optical and radio afterglow are sensitive to the area of the localization, observing constrains and the telescope. Searching these large sky regions spanning a few tens to hundreds of square degrees is a formidable challenge for most ground-based telescopes. The speaker will talk about various methods of fast follow-up strategies to find the counterpart of the gravitational wave source, notably in x-ray, optical and radio. The first part of the talk is about the algorithms for better scheduling of such follow-up observations in order to maximize the detection probability of the optical and radio counterpart (afterglow), based on the all–sky probability distribution of the source position. The algorithms incorporate the realistic observing constraints and include galaxy catalog to improve the search. The latter part of the talk demonstrate the importance of early trigger and alert of the BNS merger in aLIGO sensitivity to observe the prompt emissions (and pre-merger emissions) from the BNS coalescence. He will discuss the challenges to produce an early alert and possible solutions to those. The work accounts the background rate and the computation time to generate the alert. We use PyCBC to search for the signal and BAYESTAR to localize the source on the sky.