The Astrophysical Journal (Jan 2024)

Constraining Near-simultaneous Radio Emission from Short Gamma-Ray Bursts Using CHIME/FRB

  • Alice P. Curtin,
  • Sloane Sirota,
  • Victoria M. Kaspi,
  • Shriharsh P. Tendulkar,
  • Mohit Bhardwaj,
  • Amanda M. Cook,
  • Wen-Fai Fong,
  • B. M. Gaensler,
  • Robert A. Main,
  • Kiyoshi W. Masui,
  • Daniele Michilli,
  • Ayush Pandhi,
  • Aaron B. Pearlman,
  • Paul Scholz,
  • Kaitlyn Shin

DOI
https://doi.org/10.3847/1538-4357/ad5c65
Journal volume & issue
Vol. 972, no. 1
p. 125

Abstract

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We use the Canadian Hydrogen Intensity Mapping Experiment (CHIME) Fast Radio Burst (FRB) Project to search for FRBs that are temporally and spatially coincident with gamma-ray bursts (GRBs) occurring between 2018 July 7 and 2023 August 3. We do not find any temporal (within 1 week) and spatial (within overlapping 3 σ localization regions) coincidences between any CHIME/FRB candidates and all GRBs with 1 σ localization uncertainties <1°. As such, we use CHIME/FRB to constrain the possible FRB-like radio emission for 27 short gamma-ray bursts (SGRBs) that were within 17° of CHIME/FRB’s meridian at a point either 6 hr prior up to 12 hr after the high-energy emission. Two SGRBs, GRB 210909A and GRB 230208A, were above the horizon at CHIME at the time of their high-energy emission and we place some of the first constraints on simultaneous FRB-like radio emission from SGRBs. While neither of these two SGRBs have known redshifts, we construct a redshift range for each GRB based on their high-energy fluence and a derived SGRB energy distribution. For GRB 210909A, this redshift range corresponds to z = [0.009, 1.64] with a mean of z = 0.13. Thus, for GRB 210909A, we constrain the radio luminosity at the time of the high-energy emission to L < 2 × 10 ^46 erg s ^−1 , L < 5 × 10 ^44 erg s ^−1 , and L < 3 × 10 ^42 erg s ^−1 assuming redshifts of z = 0.85, z = 0.16, and z = 0.013, respectively. We compare these constraints with the predicted simultaneous radio luminosities from different compact object merger models.

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