A RADIO-SELECTED SAMPLE OF GAMMA-RAY BURST AFTERGLOWS

By P. Chandra, D. Frail. 2011

145 citations recorded by the source corpus.

We present a catalog of radio afterglow observations of gamma-ray bursts (GRBs) over a 14 year period from 1997 to 2011. Our sample of 304 afterglows consists of 2995 flux density measurements (including upper limits) at frequencies between 0.6 GHz and 660 GHz, with the majority of data taken at 8.5 GHz frequency band (1539 measurements). We use this data set to carry out a statistical analysis of the radio-selected sample. The detection rate of radio afterglows has stayed unchanged almost at 31% before and after the launch of the Swift satellite. The canonical long-duration GRB radio light curve at 8.5 GHz peaks at three to six days in the source rest frame, with a median peak luminosity of 1031 erg s−1 Hz−1. The peak radio luminosities for short-hard bursts, X-ray flashes, and the supernova–GRB classes are an order of magnitude or more fainter than this value. There are clear relationships between the detectability of a radio afterglow and the fluence or energy of a GRB, and the X-ray or optical brightness of the afterglow. However, we find few significant correlations between these same GRB and afterglow properties and the peak radio flux density. We also produce synthetic light curves at centimeter and millimeter bands using a range of blast wave and microphysics parameters derived from multiwavelength afterglow modeling, and we use them to compare to the radio sample. Finding agreement, we extrapolate this behavior to predict the centimeter and millimeter behavior of GRBs observed by the Expanded Very Large Array and the Atacama Large Millimeter Array.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/6dbf0349b0d20bada57456a021988232504405f0

How researchers see this paper

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In Astronomy and Astrophysics

1. Bing Zhang
2. Xuefeng Wu
3. W. Lei
4. He Gao
5. E. Berger
6. D. A. Kann
7. Y. Zou
8. S. Klose

In Nuclear and High Energy Physics

1. He Gao
2. Bing Zhang
3. Xuefeng Wu
4. W. Lei
5. D. Frail
6. M. Bremer
7. T. Güver
8. S. Nissanke

Citations in the corpus

• Short-Duration Gamma-Ray Bursts (2013, unknown): “This is a low detection fraction compared to long GRBs (with∼ 30%; Chandra & Frail 2012), but it is not surprising considering that radio follow-up is generally sensitivity-limited even for long GRBs.”
• A complete reference of the analytical synchrotron external shock models of gamma-ray bursts (2013, background): “Nonetheless, the data indicate that the low-energy (optical and radio) afterglows (Kann et al., 2010, 2011; Chandra and Frail, 2012) and the late-time X-ray afterglow is more likely of the external shock origin.”
• IDENTIFYING ELUSIVE ELECTROMAGNETIC COUNTERPARTS TO GRAVITATIONAL WAVE MERGERS: AN END-TO-END SIMULATION (2012, background): “…i). we expect observable non-thermal radio emission from beamed ultra-relativistic ejecta of SGRBs (Berger et al. 2005; Soderberg et al. 2006; Chandra & Frail 2012), ii). we could observe a coherent radio burst emitted from a magnetically-driven, relativistic plasma outflow prior to the NS…”
• THE AFTERGLOW OF GRB 130427A FROM 1 TO 1016 GHz (2013, background): “In contrast, most well-studied radio afterglows are flat or even rising over the first week and fade steeply after that time (Chandra & Frail 2012).”