Prompt optical detection of GRB 050401 with ROTSE-IIIa
Rykoff, E. S. and Yost, S. A. and Krimm, H. A and Aharonian, F. and Akerlof, C. W. and Alatalo, K. and Ashley, M. C. B. and Barthelmy, S. D. and Gehrels, N. and Göğüş, Ersin and Güver, Tolga and Horns, D. and Kızıloğlu, Ü. and McKay, T. A. and Özel, M. and Phillips, A. and Quimby, R. M. and Rujopakarn, W. and Schaefer, B. E. and Smith, D. A. and Swan, H. F. and Vestrand, W. T. and Wheeler, J. C. and Wren, J. (2005) Prompt optical detection of GRB 050401 with ROTSE-IIIa. The Astrophysical journal, 631 (2). L121-L124. ISSN 0004-637X
Official URL: http://dx.doi.org/10.1086/497370
The ROTSE-IIIa telescope at Siding Spring Observatory, Australia, detected prompt optical emission from Swift GRB 050401. We present observations of the early optical afterglow, first detected by the ROTSE-IIIa telescope 33 s after the start of -ray emission, contemporaneous with the brightest peak of this emission. This GRB was neither exceptionally long nor bright. This is the first prompt optical detection of a GRB of typical duration and luminosity. We find that the early afterglow decay does not deviate significantly from the power-law decay observable at later times and is uncorrelated with the prompt -ray emission. We compare this detection with the other two GRBs with prompt observations, GRB 990123 and GRB 041219a. All three bursts exhibit quite different behavior at early times.
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