Rapid Identification of GRB Afterglows with Swift/UVOT

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Gamma-Ray Sources, Gamma-Ray Bursts, Ground-Based Ultraviolet, Optical And Infrared Telescopes

Scientific paper

As part of the automated response to a new GRB, the UVOT instrument on Swift starts a 200-second exposure with the V filter within ~ 100 seconds of the BAT burst trigger. The instrument searches for sources in a 8' × 8' region, and sends the list of sources and a 160'' × 160'' sub-image centered on the burst position to the ground via TDRSS. These raw products and additional products calculated on the ground are then distributed through the GCN within a few minutes of the trigger. We describe the sensitivity of these data for detecting afterglows, summarize current results, and outline plans for rapidly distributing future detections.

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