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RJK Observations of the Optical Afterglow of GRB 991216 | | P. M. Garnavich
; S. Jha
; M. A. Pahre
; K. Z. Stanek
; R. P. Kirshner
; M. R. Garcia
; A. H. Szentgyorgyi
; J. L. Tonry
; | | Date: |
29 Mar 2000 | | Journal: | 2000, ApJ, 543, 61 | | Subject: | astro-ph | | Affiliation: | Notre Dame), S. Jha, M. A. Pahre, K. Z. Stanek, R. P. Kirshner, M. R. Garcia, A. H. Szentgyorgyi (CfA) and J. L. Tonry (Hawaii | | Abstract: | We present near-infrared and optical observations of the afterglow to the Gamma-Ray Burst (GRB) 991216 obtained with the F. L. Whipple Observatory 1.2-m telescope and the University of Hawaii 2.2-m telescope. The observations range from 15 hours to 3.8 days after the burst. The temporal behavior of the data is well described by a single power-law decay with index -1.36 +/-0.04, independent of wavelength. The optical spectral energy distribution, corrected for significant Galactic reddening of E(B-V)=0.626, is well fitted by a single power-law with index -0.58 +/- 0.08. Combining the IR/optical observations with a Chandra X-ray measurement gives a spectral index of -0.8 +/- 0.1 in the synchrotron cooling regime. A comparison between the spectral and temporal power-law indices suggest that a jet is a better match to the observations than a simple spherical shock. | | Source: | arXiv, astro-ph/0003429 | | Services: | Forum | Review | PDF | Favorites | |
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