English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Short gamma-ray bursts (GRBs) are the aftermath of compact binary mergersinvolving neutron stars. If the merger remnant is a millisecond magnetarinstead of a black hole, a significant proportion of the rotational energydeposited to the emerging ejecta can produce a late-time radio brightening fromits interaction with the ambient medium. Detection of this late-time radioemission from short GRBs can have profound implications for understanding thephysics of the progenitor. We report the radio observations of five short GRBs- 050709, 061210, 100625A, 140903A, and 160821B using the Giant Metrewave RadioTelescope (GMRT) at 1250, 610, and 325 MHz frequencies after $\sim$ $2 - 11$years from the time of the burst. The GMRT observations at low frequencies areparticularly important to detect the signature of merger ejecta emission at thepeak. These observations are the most delayed searches associated with some ofthese GRBs for any late-time low-frequency emission. We find no evidence forsuch an emission. We find that none of these GRBs are consistent with maximallyrotating magnetar with a rotational energy of $\sim 10^{53}\, {\rm ergs}$.However, magnetars with lower rotational energies cannot be completely ruledout. Despite the non detection, our study underscores the power of radioobservations in the search for magnetar signatures associated with short GRBs.However, only future radio observatories may have the capabilities to eitherdetect these signatures or put more stringent constraints on the model.

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