LOFAR early-time search for coherent radio emission from Short GRB 181123B. (arXiv:2008.12657v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Rowlinson_A/0/1/0/all/0/1">A. Rowlinson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Starling_R/0/1/0/all/0/1">R.L.C. Starling</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gourdji_K/0/1/0/all/0/1">K. Gourdji</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Anderson_G/0/1/0/all/0/1">G.E. Anderson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Veen_S/0/1/0/all/0/1">S. ter Veen</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mandhai_S/0/1/0/all/0/1">S. Mandhai</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wijers_R/0/1/0/all/0/1">R.A.M.J. Wijers</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Shimwell_T/0/1/0/all/0/1">T.W. Shimwell</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Horst_A/0/1/0/all/0/1">A.J. van der Horst</a>
The mergers of two neutron stars are typically accompanied by broad-band
electromagnetic emission from either a relativistic jet or a kilonova. It has
also been long predicted that coherent radio emission will occur during the
merger phase or from a newly formed neutron star remnant, however this emission
has not been seen to date. This paper presents the deepest limits for this
emission from a neutron star merger folowing triggered LOFAR observations of
the short gamma-ray burst (SGRB) 181123B, starting 4.4 minutes after the GRB
occurred. During the X-ray plateau phase, a signature of ongoing energy
injection, we detect no radio emission to a 3$sigma$ limit of 153 mJy at 144
MHz, which is significantly fainter to the predicted emission from a standard
neutron star. Snapshot images were made of the radio observation on a range of
timescales, targeting short duration radio flashes similar to fast radio bursts
(FRBs). No emission was detected in the snapshot images at the location of GRB
181123B enabling constraints to be placed on the prompt coherent radio emission
model and emission predicted to occur when a neutron star collapses to form a
black hole.
The mergers of two neutron stars are typically accompanied by broad-band
electromagnetic emission from either a relativistic jet or a kilonova. It has
also been long predicted that coherent radio emission will occur during the
merger phase or from a newly formed neutron star remnant, however this emission
has not been seen to date. This paper presents the deepest limits for this
emission from a neutron star merger folowing triggered LOFAR observations of
the short gamma-ray burst (SGRB) 181123B, starting 4.4 minutes after the GRB
occurred. During the X-ray plateau phase, a signature of ongoing energy
injection, we detect no radio emission to a 3$sigma$ limit of 153 mJy at 144
MHz, which is significantly fainter to the predicted emission from a standard
neutron star. Snapshot images were made of the radio observation on a range of
timescales, targeting short duration radio flashes similar to fast radio bursts
(FRBs). No emission was detected in the snapshot images at the location of GRB
181123B enabling constraints to be placed on the prompt coherent radio emission
model and emission predicted to occur when a neutron star collapses to form a
black hole.
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