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Title:
Prompt Optical Observations of GRB 050319 with the Swift UVOT
Authors:
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.; Rosen, S.; Schady, P.
Affiliation:
AA(Mullard Space Science Laboratory, Department of Space and Climate Physics, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK; .), AB(Mullard Space Science Laboratory, Department of Space and Climate Physics, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK; .), AC(NASA Goddard Space Flight Center, Greenbelt, MD 20771.), AD(NASA Goddard Space Flight Center, Greenbelt, MD 20771.), AE(Mullard Space Science Laboratory, Department of Space and Climate Physics, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK; .), AF(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802.), AG(NASA Goddard Space Flight Center, Greenbelt, MD 20771.), AH(Department of Physics, University of Nevada, Las Vegas, NV 89154.), AI(Mullard Space Science Laboratory, Department of Space and Climate Physics, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK; .), AJ(Mullard Space Science Laboratory, Department of Space and Climate Physics, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK; .), AK(NASA Goddard Space Flight Center, Greenbelt, MD 20771.), AL(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802.), AM(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802.), AN(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802.), AO(NASA Goddard Space Flight Center, Greenbelt, MD 20771.), AP(Mullard Space Science Laboratory, Department of Space and Climate Physics, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK; .), AQ(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802.), AR(Mullard Space Science Laboratory, Department of Space and Climate Physics, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK; .), AS(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), AT(Mullard Space Science Laboratory, Department of Space and Climate Physics, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK; .), AU(Mullard Space Science Laboratory, Department of Space and Climate Physics, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK; .)
Publication:
The Astrophysical Journal, Volume 639, Issue 1, pp. 311-315. (ApJ Homepage)
Publication Date:
03/2006
Origin:
UCP
ApJ Keywords:
Astrometry, Galaxies: Distances and Redshifts, Gamma Rays: Bursts, Shock Waves- X-rays: individual (GRB 050319)
DOI:
10.1086/499293
Bibliographic Code:
2006ApJ...639..311M

Abstract

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.
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