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Title: The optical luminosity function of gamma-ray bursts deduced from ROTSE-III observations

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.
Authors:
; ;  [1] ;  [2] ;  [3] ;  [4] ; ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ;  [11] ;  [12] ;  [13] ;  [14] ;  [15] ;  [16]
  1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008 (China)
  2. Research School of Astronomy and Astrophysics, The Australian National University, Weston Creek, ACT 2611 (Australia)
  3. Department of Astronomy, University of California, Berkeley, CA 94720-3411 (United States)
  4. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China)
  5. Department of Physics, University of Michigan, Ann Arbor, MI 48109 (United States)
  6. School of Physics, University of New South Wales, Sydney, NSW 2052 (Australia)
  7. Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822 (United States)
  8. Sabancı University, Orhanlı-Tuzla, 34956 İstanbul (Turkey)
  9. Department of Astronomy and Space Sciences, Istanbul University Science Faculty, 34119 Istanbul (Turkey)
  10. Middle East Technical University, 06531 Ankara (Turkey)
  11. ARIES, Manora Peak, Nainital 263129, Uttarakhand (India)
  12. SLAC National Accelerator Laboratory, Menlo Park, CA 94025 (United States)
  13. Department of Physics, Faculty of Science, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok 10330 (Thailand)
  14. Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803 (United States)
  15. Department of Astronomy, University of Texas at Austin, Austin, TX 78712 (United States)
  16. Department of Physics, College of St. Benedict, St. John's University, Collegeville, MN 56321 (United States)
Publication Date:
OSTI Identifier:
22370261
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 795; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AFTERGLOW; COMPUTERIZED SIMULATION; COSMIC GAMMA BURSTS; DECAY; DETECTION; DISTRIBUTION; EMISSION; LUMINOSITY; MONTE CARLO METHOD; STARS; TRANSIENTS