Prompt Optical Observations of GRB 050319 with the Swift UVOT

K.~O. Mason, A.~J. Blustin, P. Boyd, S.~T. Holland, M.~J. Page, P. Roming, M. Still, B. Zhang, A. Breeveld, M. de Pasquale, N. Gehrels, C. Gronwall, S. Hunsberger, M. Ivanushkina, W. Landsman, K. McGowan, J. Nousek, T. Poole, J. Rhoads, S. RosenP. Schady

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The UVOT telescope on the Swift observatory has detected optical afterglow emission from GRB 050319. The flux declined with a power-law slope of α = -0.57 between the start of observations some 230 s after the burst onset (90 s after the burst trigger) until it faded below the sensitivity threshold of the instrument after ~5 × 104 s. There is no evidence for the rapidly declining component in the early light curve that is seen at the same time in the X-ray band. The afterglow is not detected in UVOT shortward of the B band, suggesting a redshift of about 3.5. The optical V-band emission lies on the extension of the X-ray spectrum, with an optical-to-X-ray slope of β = -0.8. The relatively flat decay rate of the burst suggests that the central engine continues to inject energy into the fireball for as long as a few × 104 s after the burst.
Original languageEnglish
Pages (from-to)311-315
Number of pages5
JournalAstrophysical Journal
Issue number1
Publication statusPublished - 1 Mar 2006


  • Astrometry, Galaxies: Distances and Redshifts, Gamma Rays: Bursts, Shock Waves- X-rays: individual (GRB 050319), Astrophysics

Cite this

Mason, K. O., Blustin, A. J., Boyd, P., Holland, S. T., Page, M. J., Roming, P., Still, M., Zhang, B., Breeveld, A., de Pasquale, M., Gehrels, N., Gronwall, C., Hunsberger, S., Ivanushkina, M., Landsman, W., McGowan, K., Nousek, J., Poole, T., Rhoads, J., ... Schady, P. (2006). Prompt Optical Observations of GRB 050319 with the Swift UVOT. Astrophysical Journal, 639(1), 311-315.