We present several cases of optical observations during γ-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 7-ray emission. The derived constraints fall within the range of properties observed in GRBs with prompt optical detections, although at the faint end of optical/7-ray flux ratios. The currently accessible prompt optical limits do not require a different set of intrinsic or environmental GRB properties, relative to the events with prompt optical detections. © 2007. The American Astronomical Society. All rights reserved.
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Yost, S., Aharonian, F., Akerlof, C., Ashley, M., Barthelmy, S., Gehrels, N., Göǧüş, E., Güver, T., Horns, D., Kiziloǧlu, Ü., Krimm, H., McKay, T., Özel, M., Phillips, A., Quimby, R., Rowell, G., Rujopakarn, W., Rykoff, E., Schaefer, B., Smith, D., Swan, H., Vestrand, W., Wheeler, J., Wren, J., & Yuan, F. (2007). The dark side of rotse-III prompt GRB observations. Astrophysical Journal, 669 (2), 1107-1114. https://doi.org/10.1086/521668