GAMMA-RAY BURST AFTERGLOWS AS ANALOGS OF HIGH-FREQUENCY-PEAKED BL LAC OBJECTS
The spectral properties from radio-to-optical bands are compared between the 18 optically bright gamma-ray burst (GRB) afterglows and the well-established power-spectrum sequence in blazars. The comparison shows that the afterglows are in well agreement with the well-known blazar sequence (i.e., the {nu}L{sub {nu}}(5 GHz)-{alpha}{sub RO} correlation, where {alpha}{sub RO} is the broadband 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 (HBLs). The correlation suggests that GRB afterglows share a similar emission process with HBLs. We further identify a deviation at a significance level larger than 2{sigma} 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{sub V} is estimated to be larger than 0.5-0.6 mag from the {nu}L{sub {nu}}(5 GHz)-{alpha}{sub RO} sequence.
- OSTI ID:
- 21560591
- Journal Information:
- Astrophysical Journal Letters, Vol. 726, Issue 1; Other Information: DOI: 10.1088/2041-8205/726/1/L4; ISSN 2041-8205
- Country of Publication:
- United States
- Language:
- English
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