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Search for merger ejecta emission from late-time radio observations of short GRBs using GMRT

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dc.contributor.author Ghosh, Ankur
dc.contributor.author Vaishnava, C. S.
dc.contributor.author Resmi, L.
dc.contributor.author Misra, Kuntal
dc.contributor.author Arun, K. G.
dc.contributor.author Omar, Amitesh
dc.contributor.author Chakradhari, N. K.
dc.date.accessioned 2024-02-07T09:53:45Z
dc.date.available 2024-02-07T09:53:45Z
dc.date.issued 2024-01
dc.identifier.uri https://doi.org/10.1093/mnras/stad3614
dc.identifier.uri http://localhost:8080/xmlui/handle/123456789/1433
dc.description.abstract In some cases, the merger of two neutron stars can produce a rapidly rotating and highly magnetized millisecond magnetar. A significant proportion of the rotational energy deposited to the emerging ejecta can produce a late-time radio brightening from interacting with the ambient medium. Detection of thislate-time radio emission from short GRBs can have profound implications for understanding the physics of the progenitor. We report the radio observations of five short GRBs – 050709, 061210, 100625A, 140903A, and 160821B using the legacy Giant Metrewave Radio Telescope (GMRT) at 1250, 610, and 325 MHz frequencies and the upgraded-GMRT (uGMRT) at band 5 (1050–1450 MHz) and band 4 (550–900 MHz) after ∼2–11 yr from the time of the burst. The GMRT observations at low frequencies are particularly important to detect the signature of merger ejecta emission at the peak. These observations are the most delayed searches associated with some GRBs for any late-time low-frequency emission. We find no evidence for such an emission. We find that none of these GRBs is consistent with maximally rotating magnetar with a rotational energy of ∼ 1053 erg. However, magnetars with lower rotational energies cannot be completely ruled out. Despite the non-detection, our study underscores the power of radio observations in the search for magnetar signatures associated with short GRBs. However, only future radio observatories may be able to detect these signatures or put more stringent constraints on the model. en_US
dc.language.iso en en_US
dc.publisher Monthly Notices of the Royal Astronomical Society en_US
dc.relation.ispartofseries 2067;mn527-8068
dc.subject gravitational waves en_US
dc.subject surveys en_US
dc.subject stars: magnetars en_US
dc.subject stars: neutron en_US
dc.subject gamma-ray bursts en_US
dc.subject neutron star mergers en_US
dc.title Search for merger ejecta emission from late-time radio observations of short GRBs using GMRT en_US
dc.type Article en_US


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