| Name: | Dimple Panchal |
| Affiliation: | ARIES, Nainital |
| Conference ID : | ASI2023_442 |
| Title : | Signatures of Collapsars in High Redshift Short GRBs |
| Authors : | Dimple , Kuntal Misra , D. A. Kann, K. G. Arun, A. Ghosh, L. Resmi et al.
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| Mode of Presentation: | Poster |
| Abstract Category : | Extragalactic Astronomy |
| Abstract : | GRBs are classically categorized into two types - short bursts (T90 < 2 sec) and long bursts
(T90 > 2 sec) based on their gamma-ray emission duration. It is widely accepted that the two
populations originate from two distinct progenitor channels residing in different host galaxy
environments. However, the characteristics of two short GRBs (090426 and 200826A) hinted
toward collapsar as plausible progenitors as opposed to compact object mergers. These short GRBs lie at a relatively higher redshift as compared to the median redshift (z=0.47) of short GRBs. We investigate the properties of short GRBs at low and high redshifts employing the prompt, afterglow and host galaxy information. A careful examination of the characteristics of short GRBs at different redshifts reveals that some short GRBs at high redshifts have properties similar to long GRBs indicating a collapsar origin. Multi-messenger observations have immense potential to shed light on this problem. Third-generation Gravitational wave detectors such as Einstein Telescope and Cosmic Explorer will have the sensitivity to observe binary neutron stars at redshifts around 1 which will be helpful in understanding the progenitors of GRBs.
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