Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-07-20
Mon.Not.Roy.Astron.Soc.372:209-212,2006
Astronomy and Astrophysics
Astrophysics
4 pages, 2 figures, accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2006.10827.x
We report on the search for optical bursts from J1819-1458, a member of the recently discovered Rotating Radio Transients (RRATs). J1819-1458 exhibits 3 millisecond bursts with a peak flux at 1.4 GHz of 3.6 Jy every ~3.4 minutes, implying that it is visible for only ~1 second per day at radio wavelengths. Assuming that the optical light behaves in a similar manner, the most sensitive way of detecting RRATs is hence not to take long exposures of the field, but instead to capture individual bursts using a high-speed camera mounted on a large aperture telescope. Using ULTRACAM on the 4.2-m William Herschel Telescope (WHT) we obtained 97100 images of the field of J1819-1458, each of 18.1 milliseconds exposure time and with essentially no dead-time between the frames. We find no evidence for bursts in u', g' and i' at magnitudes brighter than 15.1, 17.4 and 16.6 (5 sigma), corresponding to fluxes of less than 3.3, 0.4 and 0.8 mJy at 3560A, 4820A and 7610A, respectively.
Dhillon Vik S.
Littlefair Stuart P.
Marsh Thomas R.
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