Catalog of narrow C IV absorption lines in BOSS (II): for quasars with
  zem > 2.4
  As the second work in a series of papers aiming to detect absorption systems
in the quasar spectra of the Baryon Oscillation Spectroscopic Survey, we
continue the analysis of Paper I by expanding the quasar sample to those
quasars with zem>2.4. This yields a sample of 21,963 appropriate quasars to
search for narrow C IV absorptions with Wr>=0.2A for both lines. There are 9708
quasars with at least one appropriate absorption system imprinted on their
spectra. From these spectra, we detect 13,919 narrow Civabsorption systems
whose absorption redshifts cover a range of zabs=1.8784 - 4.3704. In this paper
and Paper 1, we have selected 37,241 appropriate quasars with median SNR>= 4
and 1.54<= zem <=5.16 to visually analyze narrow C IV absorption doublets one
by one. A total of 15,999 quasars are found to have at least one appropriate
absorption system imprinted on their spectra. From these 15,999 quasar spectra,
we have detected 23,336 appropriate C IV absorption systems with Wr>=0.2A whose
absorption redshifts cover a range of zabs=1.4544 - 4.3704. The largest values
of Wr are 3.19 A for the \lambda1548 absorption line and 2.93 A for the
lambda1551 absorption line, respectively. We find that only a few absorbers
show large values of Wr. About 1.1% absorbers of the total absorbers have
Wr>=2.0 A.
