The Dark Side of ROTSE-III Prompt GRB Observations
S. A. Yost, F. Aharonian, C. W. Akerlof, M. C. B. Ashley, S., Barthelmy, N. Gehrels, E. Gogus, T. Guver, D. Horns, U. Kiziloglu, H. A., Krimm, T. A. McKay, M. Ozel, A. Phillips, R. M. Quimby, G. Rowell, W., Rujopakarn, E. S. Rykoff, B. E. Schaefer, D. A. Smith, H. F. Swan, W. T.
TL;DR
This paper analyzes prompt optical limits during GRBs observed by ROTSE-III, showing that non-detections still provide valuable constraints on optical fluxes and brightness ratios, consistent with known GRB properties.
Contribution
It provides the first systematic analysis of prompt optical limits during GRBs, highlighting their significance in understanding GRB emission properties.
Findings
Prompt optical limits are consistent with known GRB properties.
Non-detections do not imply different intrinsic or environmental conditions.
Constraints are at the faint end of optical/gamma flux ratios.
Abstract
We present several cases of optical observations during gamma-ray bursts (GRBs) which resulted in prompt limits but no detection of optical emission. These limits constrain the prompt optical flux densities and the optical brightness relative to the gamma-ray emission. The derived constraints fall within the range of properties observed in GRBs with prompt optical detections, though at the faint end of optical/gamma flux ratios. The presently accessible prompt optical limits do not require a different set of intrinsic or environmental GRB properties, relative to the events with prompt optical detections.
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