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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Aaron LI
# 2015/06/16
"""
Add a time column for the chandra blanksky event file.
The time data are generated with a uniform distribution
between TSTART and TSTOP.
"""
__version__ = "0.1.0"
__date__ = "2015/06/16"
import sys
import argparse
import numpy as np
try:
from astropy.io import fits
except ImportError:
try:
import pyfits as fits
except ImportError:
raise ImportError("cannot import 'astropy.io.fits' or 'pyfits'")
def add_time_column(fitsfile, blockname="EVENTS"):
"""
Add a time column to the specified block of the input fits file.
The time data are generated with a uniform distribution
between TSTART and TSTOP.
Return:
A fits object with the new time column.
"""
if isinstance(fitsfile, str):
fitsfile = fits.open(fitsfile)
table = fitsfile[blockname]
tstart = table.header["TSTART"]
tstop = table.header["TSTOP"]
counts = len(table.data)
time_data = np.random.uniform(tstart, tstop, counts)
time_col = fits.Column(name="time", format="1D", unit="s", array=time_data)
newtable = fits.BinTableHDU.from_columns(
fits.ColDefs([time_col]) + table.columns)
fitsfile[blockname].data = newtable.data
return fitsfile
def main():
parser = argparse.ArgumentParser(
description="Add a time column for Chandra blanksky event file.")
parser.add_argument("-V", "--version", action="version",
version="%(prog)s " + "%s (%s)" % (__version__, __date__))
parser.add_argument("infile", help="input chandra blanksky file")
parser.add_argument("outfile", nargs="?", default=None,
help="modified blanksky file. IN-PLACE modification if omitted.")
parser.add_argument("-C", "--clobber", dest="clobber",
action="store_true", help="overwrite output file if exists")
args = parser.parse_args()
newfits = add_time_column(args.infile)
if args.outfile:
newfits.writeto(args.outfile, clobber=args.clobber)
else:
newfits.writeto(args.infile, clobber=True)
if __name__ == "__main__":
main()
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