NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Spectral Evolution in GRB 990510We present time-resolved spectroscopy of the afterglow of GRB 990510. Through the identification of several absorption lines in the first epoch spectrum, we determine the redshift for this burst to be z >= 1.6190 +/- 0.0016. No clear emission lines are detected. From the absence of the Ly.alpha drop, we can put an upper limit to the redshift of z <= 2.3. We study the time evolution of the MgII absorption line in our spectra taken 0.8 and 3.9 days after the burst, whose equivalent width (E.W.) is expected to change in case the burst resides in a dense compact medium (Perna & Loeb 1998). We measure an E.W. of 2.5 /- 0.2 and 2.3 +/- 0.6 in the spectra 0.8 and 3.8 days after the burst, respectively. Our results suggest that the atoms responsible for the absorption are not in the vicinity of the site of the burst.
Document ID
20000070736
Acquisition Source
Marshall Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Vreeswijk, P. M.
(Amsterdam Univ. Netherlands)
Rol, E.
(Amsterdam Univ. Netherlands)
Galama, T. J.
(Amsterdam Univ. Netherlands)
Wijers, R. A. M. J.
(State Univ. of New York Stony Brook, NY United States)
vanParadijs, J.
(Amsterdam Univ. Netherlands)
Kouveliotou, C.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Frontera, F.
(Consiglio Nazionale delle Ricerche Bologna, Italy)
Pian, E.
(Consiglio Nazionale delle Ricerche Bologna, Italy)
Palazzi, E.
(Consiglio Nazionale delle Ricerche Bologna, Italy)
Masetti, N.
(Consiglio Nazionale delle Ricerche Bologna, Italy)
Date Acquired
August 19, 2013
Publication Date
January 1, 2000
Subject Category
Astronomy
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Available Downloads

There are no available downloads for this record.
No Preview Available