Extrapolations of gamma-ray burst spectra to the optical-UV band

Astronomy and Astrophysics – Astronomy

Scientific paper

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Gamma-Ray Sources, Gamma-Ray Bursts, Spectroscopy And Spectrophotometry, Astronomical Observations

Scientific paper

Many gamma-ray burst counterpart searches are being conducted in the optical-UV band. To both predict detectability and understand the meaning of any detections or upper limits, we extrapolate gamma-ray spectra from 54 bright gamma-ray bursts to optical-UV energies. We assume optical emission is concurrent with gamma-ray emission and do not consider quiescent or fading counterparts. We find that the spectrum must be steeper (greater flux at low energy) than a simple extrapolation for more than one simultaneous optical flash to be observable per year by current searches.

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