Journal
ASTROPHYSICAL JOURNAL
Volume 639, Issue 1, Pages 311-315Publisher
IOP PUBLISHING LTD
DOI: 10.1086/499293
Keywords
astrometry; galaxies : distances and redshifts; gamma rays : bursts; shock waves; X-rays : individual (GRB 050319)
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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 alpha = -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 similar to 5 x 10(4) 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 beta = 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 x 10(4) s after the burst.
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