Real-Time Optical Flux Limits From Gamma-Ray Bursts Measured By The GROCSE Experiment

Abstract

The Gamma-Ray Optical Counterpart Search Experiment (GROCSE) presents new experimental upper limits on the optical flux from gamma-ray bursts (GRBs). Our experiment consisted of a fully-automated very wide-field opto-electronic detection system that imaged locations of GRBs within a few seconds of receiving trigger signals provided by BATSE's real-time burst coordinate distribution network (BACODINE). The experiment acquired ~3800 observing hours, recording 22 gamma-ray burst triggers within $\sim$30 s of the start of the burst event. Some of these bursts were imaged while gamma-ray radiation was being detected by BATSE. We identified no optical counterparts associated with gamma-ray bursts amongst these events at the m${}_V$ $\sim$ 7.0 to 8.5 sensitivity level. We find the ratio of the upper limit to the V-band optical flux, F${}_{\nu }$, to the gamma-ray fluence, ${\Phi }_{\gamma }$, from these data to be $2\times 10^{-18}<F_{\nu }/{\Phi }_{\gamma }<2\times 10^{-16}$.

28 pages, LaTeX, requires aasms4.sty and apjpt4.sty, 5 EPS figures; submitted to Astrophysical Journal

References in corpus (6)

• Unsteady Outflow Models for Cosmological Gamma-Ray Bursts
• Low Frequency Spectra of Gamma-Ray Bursts
• Spectral Properties of Blast Wave Models of Gamma-Ray Burst Sources
• Cooling Time Scales and Temporal Structure of Gamma-Ray Bursts
• Spectra of Unsteady Wind Models of Gamma-Ray Bursts
• Extrapolations of BATSE Gamma-Ray Burst Spectra to the Optical-UV Band

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• Tile or Stare? Cadence and Sky Monitoring Observing Strategies that Maximize the Number of Discovered Transients
• The Optical Luminosity Function of Gamma-ray Bursts deduced from ROTSE-III Observations