Late-time Evolution and Modeling of the Off-axis Gamma-Ray Burst Candidate FIRST J141918.9+394036
Open Access
- 1 January 2022
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 924 (1), 16
- https://doi.org/10.3847/1538-4357/ac3330
Abstract
We present new radio and optical data, including very-long-baseline interferometry, as well as archival data analysis, for the luminous, decades-long radio transient FIRST J141918.9+394036. The radio data reveal a synchrotron self-absorption peak around 0.3 GHz and a radius of around 1.3 mas (0.5 pc) 26 yr post-discovery, indicating a blastwave energy similar to 5 x 10(50) erg. The optical spectrum shows a broad [O iii]lambda 4959,5007 emission line that may indicate collisional excitation in the host galaxy, but its association with the transient cannot be ruled out. The properties of the host galaxy are suggestive of a massive stellar progenitor that formed at low metallicity. Based on the radio light curve, blastwave velocity, energetics, nature of the host galaxy and transient rates, we find that the properties of J1419+3940 are most consistent with long gamma-ray burst (LGRB) afterglows. Other classes of (optically discovered) stellar explosions as well as neutron star mergers are disfavored, and invoking any exotic scenario may not be necessary. It is therefore likely that J1419+3940 is an off-axis LGRB afterglow (as suggested by Law et al. and Marcote et al.), and under this premise the inverse beaming fraction is found to be f(b)(-1) similar or equal to 280(-200)(+700), corresponding to an average jet half-opening angle similar or equal to 5(-2)(+4) degrees (68% confidence), consistent with previous estimates. From the volumetric rate we predict that surveys with the Very Large Array, Australian Square Kilometre Array Pathfinder, and MeerKAT will find a handful of J1419+3940-like events over the coming years.This publication has 153 references indexed in Scilit:
- CALORIMETRY OF GRB 030329: SIMULTANEOUS MODEL FITTING TO THE BROADBAND RADIO AFTERGLOW AND THE OBSERVED IMAGE EXPANSION RATEThe Astrophysical Journal, 2013
- LATE-TIME OPTICAL EMISSION FROM CORE-COLLAPSE SUPERNOVAEThe Astrophysical Journal, 2012
- IMPROVED BACKGROUND SUBTRACTION FOR THE SLOAN DIGITAL SKY SURVEY IMAGESThe Astronomical Journal, 2011
- Circumstellar Emission from Type Ib and Ic SupernovaeThe Astrophysical Journal, 2006
- Orphan Gamma‐Ray Burst Radio Afterglows: Candidates and Constraints on BeamingThe Astrophysical Journal, 2002
- Beaming in Gamma-Ray Bursts: Evidence for a Standard Energy ReservoirThe Astrophysical Journal, 2001
- Radio Observations of SN 1979C: Evidence for Rapid Presupernova EvolutionThe Astrophysical Journal, 2000
- Spectra and Light Curves of Gamma-Ray Burst AfterglowsThe Astrophysical Journal, 1998
- The FIRST Survey: Faint Images of the Radio Sky at Twenty CentimetersThe Astrophysical Journal, 1995
- Radio supernovaeThe Astrophysical Journal, 1986