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Journal Article

Prompt Optical Detection of GRB 050401 with ROTSE-IIIa

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Aharonian,  F.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Horns,  Dieter
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Citation

Rykoff, E., Aharonian, F., Akerlof, C. W., Alatalo, K., Ashley, M. C. B., Güver, T., et al. (2005). Prompt Optical Detection of GRB 050401 with ROTSE-IIIa. The Astrophysical Journal, 631(2, part 2), L212-L124. Retrieved from http://cdsaas.u-strasbg.fr:2001/ApJ/journal/issues/ApJ/v631n2/62714/brief/62714.abstract.html.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-8814-E
Abstract
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 gamma-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 gamma-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.