An evaluation of the BALROG and RoboBA algorithms for determining the position of Fermi/GBM GRBs
arxiv(2024)
摘要
The Fermi/GBM instrument is a vital source of detections of gamma-ray bursts
and has an increasingly important role to play in understanding
gravitational-wave transients. In both cases, its impact is increased by
accurate positions with reliable uncertainties. We evaluate the RoboBA and
BALROG algorithms for determining the position of gamma-ray bursts detected by
the Fermi/GBM instrument. We construct a sample of 54 bursts with detections
both by Swift/BAT and by Fermi/GBM. We then compare the positions predicted by
RoboBA and BALROG with the positions measured by BAT, which we can assume to be
the true position. We find that RoboBA and BALROG are similarly precise for
bright bursts whose uncertainties are dominated by systematic errors, but
RoboBA performs better for faint bursts whose uncertainties are dominated by
statistical noise. We further find that the uncertainties in the positions
predicted by RoboBA are consistent with the distribution of position errors,
whereas BALROG seems to be underestimating the uncertainties by a factor of
about two. Additionally, we consider the implications of these results for the
follow-up of the optical afterglows of Fermi/GBM bursts. In particular, for the
DDOTI wide-field imager we conclude that a single pointing is best. Our sample
would allow a similar study to be carried out for other telescopes.
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