Gamma-Ray Burst Afterglows as Analogs of High-Frequency-Peaked Bl Lac Objects

Abstract

The spectral properties from radio to optical bands are compared between the 18 optically bright Gamma-ray burst afterglows and well established powerspectrum sequence in Blazars. The comparison shows that the afterglows are well agreement with the well known Blazar sequence (i.e., the νL ν (5GHz)-α RO correlation, where α RO is the broad-band spectral slope from radio to optical bands). The afterglows are, however, clustered at the low luminosity end of the sequence, which is typically occupied by high frequency-peaked BL Lac objects. The correlation suggests that Gamma-ray burst afterglows share the similar emission process with high frequency-peaked BL Lac objects. We further identify a deviation at a significance level larger than 2σ from the sequence for three typical optically "dark" bursts. The deviation favors a heavy extinction in optical bands for the "dark" bursts. The extinction A V is estimated to be larger than 0.5-0.6 magnitude from the νL ν (5GHz)-α RO sequence.

Diode-pumped tunable Tm : YLF laser for mid-infrared gas spectroscopy

“…Because there are two peaks in the blazar SED and there is no correlation between E iso and νL ν (5 GHz) in GRBs (Chandra & Frail 2012), from our simple analysis above we cannot conclude that GRBs have a different νL ν (5 GHz)-ν peak correlation from blazars. In this paper, we find, similarly to Wang & Wei (2011), that GRBs occupy the low radio luminosity end of the blazar sequence.…”

“…Some works have been done on the comparison between GRBs and AGNs. Wang & Wei (2011) compared the spectral properties of blazars and optically bright GRB afterglows, and found that GRB afterglows have the same radiation mechanism as BL Lac objects. A similar correlation between the synchrotron luminosity and Doppler factor of GRBs and AGNs has been found (Wu et al 2011).…”

The extension of variability properties in gamma-ray bursts to blazars

“…Despite the large discrepancy of the masses of AGNs and GRBs, several universal correlations have been found among the two types of objects, strengthc 0000 RAS ening this possibility. For example, Wang & Wei (2011) found that the GRB afterglows and BL Lacs may have the same radiation mechanism based on a similar relation in radio luminosity and spectral slope in radio and optical band, which is further confirmed by Wang et al (2014) with two new similar relations of spectral properties. Wu et al (2011) found a universal correlation between synchrotron luminosity and Doppler factor in GRBs and blazars, where they assumed the prompt emission of GRBs is dominated by synchrotron emission.…”

Doppler Boosting Effect on the Jet Radiation of Gamma-Ray Bursts and Active Galactic Nuclei

“…Ghisellini et al 2009;Zhang et al 2012). Some comparative studies show evidence of similar jet properties between AGNs and GRBs (e.g., Wang et al 2011;Nemmen et al 2012;Zhang et al 2013). Liang et al (2015) found a tight correlation among the peak luminosity (L p ), the peak energy (E p,z ) of the νf ν spectrum in the GRBs rest frame, and the initial Lorentz factor (Γ 0 ) of GRBs jets.…”