The Optical Luminosity Function Of Gamma-Ray Bursts Deduced From ROTSE-III Observations

Date

2014-11

Authors

Cui, X. H.
Wu, X. F.
Wei, J. J.
Yuan, F.
Zheng, W. K.
Liang, E. W.
Akerlof, C. W.
Ashley, M. C. B.
Flewelling, H. A.
Gogus, E.

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Abstract

We present the optical luminosity function (LF) of gamma-ray bursts (GRBs) estimated from a uniform sample of 58 GRBs from observations with the Robotic Optical Transient Search Experiment III (ROTSE-III). Our GRB sample is divided into two sub-samples: detected afterglows (18 GRBs) and those with upper limits (40 GRBs). We derive R-band fluxes for these two sub-samples 100 s after the onset of the burst. The optical LFs at 100 s are fitted by assuming that the co-moving GRB rate traces the star formation rate. While fitting the optical LFs using Monte Carlo simulations, we take into account the detection function of ROTSE-III. We find that the cumulative distribution of optical emission at 100 s is well described by an exponential rise and power-law decay, a broken power law, and Schechter LFs. A single power-law (SPL) LF, on the other hand, is ruled out with high confidence.

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Citation

Cui, X. H., X. F. Wu, J. J. Wei, F. Yuan, W. K. Zheng, E. W. Liang, C. W. Akerlof et al. "The optical luminosity function of gamma-ray bursts deduced from ROTSE-III observations." The Astrophysical Journalm, Vol. 795, No. 2 (Nov., 2014): 103.