A targeted search for repeating fast radio bursts associated with gamma-ray bursts. (arXiv:2007.13246v1 [astro-ph.HE])

A targeted search for repeating fast radio bursts associated with gamma-ray bursts. (arXiv:2007.13246v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Palliyaguru_N/0/1/0/all/0/1">Nipuni T. Palliyaguru</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Agarwal_D/0/1/0/all/0/1">Devansh Agarwal</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Golpayegani_G/0/1/0/all/0/1">Golnoosh Golpayegani</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lynch_R/0/1/0/all/0/1">Ryan Lynch</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lorimer_D/0/1/0/all/0/1">Duncan R. Lorimer</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nguyen_B/0/1/0/all/0/1">Benjamin Nguyen</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Corsi_A/0/1/0/all/0/1">Alessandra Corsi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Burke_Spolaor_S/0/1/0/all/0/1">Sarah Burke-Spolaor</a>

The origin of fast radio bursts (FRBs) still remains a mystery, even with the
increased number of discoveries in the last three years. Growing evidence
suggests that some FRBs may originate from magnetars. Large, single-dish
telescopes such as Arecibo Observatory (AO) and Green Bank Telescope (GBT) have
the sensitivity to detect FRB~121102-like bursts at gigaparsec distances. Here
we present searches using AO and GBT that aimed to find potential radio bursts
at 11 sites of past $gamma$–ray bursts that show evidence for the birth of a
magnetar. We also performed a search towards GW170817, which has a merger
remnant whose nature remains uncertain. We place $10,sigma$ fluence upper
limits of $approx 0.036$ Jy ms at 1.4 GHz and $approx 0.063$ Jy ms at 4.5 GHz
for AO data and fluence upper limits of $approx 0.085$ Jy ms at 1.4 GHz and
$approx 0.098$ Jy ms at 1.9 GHz for GBT data, for a maximum pulse width of
$approx 42$ ms. The AO observations had sufficient sensitivity to detect any
FRB of similar luminosity to the one recently detected from the Galactic
magnetar SGR 1935+2154. Assuming a Schechter function for the luminosity
function of FRBs, we find that our non-detections favor a steep power–law
index ($alphalesssim-1.0$) and a large cut–off luminosity ($L_0 gtrsim
10^{42}$ erg/s).

The origin of fast radio bursts (FRBs) still remains a mystery, even with the
increased number of discoveries in the last three years. Growing evidence
suggests that some FRBs may originate from magnetars. Large, single-dish
telescopes such as Arecibo Observatory (AO) and Green Bank Telescope (GBT) have
the sensitivity to detect FRB~121102-like bursts at gigaparsec distances. Here
we present searches using AO and GBT that aimed to find potential radio bursts
at 11 sites of past $gamma$–ray bursts that show evidence for the birth of a
magnetar. We also performed a search towards GW170817, which has a merger
remnant whose nature remains uncertain. We place $10,sigma$ fluence upper
limits of $approx 0.036$ Jy ms at 1.4 GHz and $approx 0.063$ Jy ms at 4.5 GHz
for AO data and fluence upper limits of $approx 0.085$ Jy ms at 1.4 GHz and
$approx 0.098$ Jy ms at 1.9 GHz for GBT data, for a maximum pulse width of
$approx 42$ ms. The AO observations had sufficient sensitivity to detect any
FRB of similar luminosity to the one recently detected from the Galactic
magnetar SGR 1935+2154. Assuming a Schechter function for the luminosity
function of FRBs, we find that our non-detections favor a steep power–law
index ($alphalesssim-1.0$) and a large cut–off luminosity ($L_0 gtrsim
10^{42}$ erg/s).

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