Detectability of GRB optical afterglows with Gaia satellite

Details Detectability of GRB optical afterglows with Gaia satellite Detectability of GRB optical afterglows with Gaia satellite

2011-07-14

arxiv.org/abs/1107.2858v2

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

14 pages, 10 figures, accepted to PASP

Scientific paper

With the launch of Gaia satellite, detection of many different types of transient sources will be possible, one of them being optical afterglows of gamma-ray bursts (GRBs). Using the knowledge of the satellites dynamics and properties of GRB optical afterglows we performed a simulation in order to estimate an average GRB detection rate with Gaia. Here we present the simulation results for two types of GRB optical afterglows, differing in the observer's line-of-sight compared to a GRB jet axis: regular (on-axis) and orphan afterglows. Results show that for on-axis GRBs, less than 10 detections in five years of foreseen Gaia operational time are expected. The orphan afterglows simulation results are more promising, giving a more optimistic number of several tens of detections in five years.

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