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Diffstat (limited to 'bin/clean_evt2.py')
| -rwxr-xr-x | bin/clean_evt2.py | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/bin/clean_evt2.py b/bin/clean_evt2.py new file mode 100755 index 0000000..5b53922 --- /dev/null +++ b/bin/clean_evt2.py @@ -0,0 +1,207 @@ +#!/usr/bin/env python3 +# +# Copyright (c) 2017 Weitian LI <liweitianux@live.com> +# MIT license + +""" +Further process the reprocessed evt2 file to make a cleaned one +for later scientific analysis. + +The following steps are carried out: +1. Filter out the chips of interest; +2. Detect (point) sources, visually check and manually update; +3. Remove the updated sources; +4. Extract light curve of the background regions (away from the object); +5. Check and clip the light curve to create a GTI; +6. Remove flares by filtering the GTI to create the finally cleaned evt2. +""" + +import os +import argparse +import subprocess +import shutil +import logging + +from _context import acispy +from acispy.manifest import get_manifest +from acispy.pfiles import setup_pfiles +from acispy.acis import ACIS +from acispy.ds9 import ds9_view + + +logging.basicConfig(level=logging.INFO) +logger = logging.getLogger(__name__) + + +def filter_chips(infile, outfile, chips, clobber=False): + """ + Filter out the chips of interest, e.g., ``ccd_id=7`` for ACIS-S + observation, and ``ccd_id=0:3`` for ACIS-I observation. + """ + chips = chips.replace("-", ":") + clobber = "yes" if clobber else "no" + logger.info("Filter out chips of interest: %s" % chips) + logger.info("Outfile: %s" % outfile) + subprocess.check_call(["punlearn", "dmcopy"]) + subprocess.check_call([ + "dmcopy", "infile=%s[ccd_id=%s]" % (infile, chips), + "outfile=%s" % outfile, "clobber=%s" % clobber + ]) + logger.info("Done!\n") + + +def detect_sources(infile, outfile, clobber=False): + """ + Detect (point) sources using ``celldetect``; examine the detected + sources in DS9, and update the source regions and save. + """ + src_fits = os.path.splitext(outfile)[0] + ".fits" + clobber = "yes" if clobber else "no" + logger.info("Detect sources using 'celldetect' ...") + logger.info("Outfile: %s" % outfile) + subprocess.check_call(["punlearn", "celldetect"]) + subprocess.check_call([ + "celldetect", "infile=%s" % infile, + "outfile=%s" % src_fits, "regfile=%s" % outfile, + "clobber=%s" % clobber + ]) + os.remove(src_fits) + shutil.copy(outfile, outfile+".orig") + logger.warning("Check and update detected source regions; " + + "and save/overwrite file: %s" % outfile) + ds9_view(infile, regfile=outfile) + logger.info("Done!\n") + + +def remove_sources(infile, outfile, srcfile, clobber=False): + """ + Remove detected sources + """ + clobber = "yes" if clobber else "no" + logger.info("Remove detected sources ...") + logger.info("Outfile: %s" % outfile) + subprocess.check_call(["punlearn", "dmcopy"]) + subprocess.check_call([ + "dmcopy", "infile=%s[exclude sky=region(%s)]" % (infile, srcfile), + "outfile=%s" % outfile, "clobber=%s" % clobber + ]) + logger.info("Done!\n") + + +def extract_lightcurve(infile, outfile, bintime=200, clobber=False): + """ + Extract the light curve from regions away from the object. + """ + clobber = "yes" if clobber else "no" + logger.info("Extract light curve for GTI generation ...") + logger.info("Outfile: %s" % outfile) + regfile = os.path.splitext(outfile)[0] + ".reg" + # Credit: https://stackoverflow.com/a/12654798/4856091 + open(regfile, "a").close() + logger.warning("Select a large region containing most of the object, " + + "but also leaving enough area outside as background; " + + "and save as file: %s" % regfile) + ds9_view(infile) + fsky = "exclude sky=region(%s)" % regfile + fbintime = "bin time=::%s" % bintime + subprocess.check_call(["punlearn", "dmextract"]) + subprocess.check_call([ + "dmextract", "infile=%s[%s][%s]" % (infile, fsky, fbintime), + "outfile=%s" % outfile, "opt=ltc1", "clobber=%s" % clobber + ]) + logger.info("Done!\n") + + +def make_gti(infile, outfile, scale=1.2, clobber=False): + """ + Examine the light curve for flares, and clip it to make the GTI. + """ + logger.info("Examine the light curve and create GTI ...") + logger.info("Outfile: %s" % outfile) + + chipsfile = os.path.splitext(outfile)[0] + ".chips" + if (not clobber) and (os.path.exists(outfile) or + os.path.exists(chipsfile)): + raise OSError("'%s' or '%s' already exists" % (outfile, chipsfile)) + + outimg = os.path.splitext(outfile)[0] + "_lc.jpg" + lines = [ + "from lightcurves import lc_clean", + "lc_clean('%s')" % infile, + "lc_clean('%s', scale=%s, outfile='%s')" % (infile, scale, outfile), + "print_window('%s', ['format', 'jpg', 'clobber', 'True'])" % outimg + ] + open(chipsfile, "w").write("\n".join(lines) + "\n") + subprocess.check_call(["chips", "-x", chipsfile]) + + if not os.path.exists(outfile): + # workaround the problem that ``chips`` sometimes just failed + logger.warning("*** Failed to create GTI: %s ***" % outfile) + logger.warning("You need to create the GTI manually.") + input("When finished GTI creation, press Enter to continue ...") + logger.info("Done!\n") + + +def filter_gti(infile, outfile, gti, clobber=False): + """ + Removing flares by filtering on GTI to create the finally cleaned + evt2 file. + """ + clobber = "yes" if clobber else "no" + logger.info("Filter on GTI to create cleaned evt2 file ...") + logger.info("Outfile: %s" % outfile) + subprocess.check_call(["punlearn", "dmcopy"]) + subprocess.check_call([ + "dmcopy", "infile=%s[@%s]" % (infile, gti), + "outfile=%s" % outfile, "clobber=%s" % clobber + ]) + logger.info("Done!\n") + + +def main(): + parser = argparse.ArgumentParser( + description="Make a cleaned evt2 for scientific analysis") + parser.add_argument("-i", "--infile", dest="infile", + help="input evt2 produced by 'chandra_repro' " + + "(default: request from manifest)") + parser.add_argument("-C", "--clobber", dest="clobber", action="store_true", + help="overwrite existing file") + args = parser.parse_args() + + setup_pfiles(["dmkeypar", "dmcopy", "celldetect", "dmextract"]) + + manifest = get_manifest() + if args.infile: + infile = args.infile + else: + infile = manifest.getpath("evt2", relative=True) + chips = ACIS.get_chips_str(infile, sep="-") + logger.info("infile: %s" % infile) + logger.info("chips: %s" % chips) + + evt2_chips = "evt2_c{chips}_orig.fits".format(chips=chips) + evt2_rmsrc = "evt2_c{chips}_rmsrc.fits".format(chips=chips) + evt2_clean = "evt2_c{chips}_clean.fits".format(chips=chips) + srcfile = "sources_celld.reg" + lcfile = "ex_bkg.lc" + gtifile = os.path.splitext(lcfile)[0] + ".gti" + + filter_chips(infile, evt2_chips, chips, clobber=args.clobber) + detect_sources(evt2_chips, srcfile, clobber=args.clobber) + remove_sources(evt2_chips, evt2_rmsrc, srcfile, clobber=args.clobber) + extract_lightcurve(evt2_rmsrc, lcfile, clobber=args.clobber) + make_gti(lcfile, gtifile, clobber=args.clobber) + filter_gti(evt2_rmsrc, evt2_clean, gtifile, clobber=args.clobber) + + # Add cleaned evt2 to manifest + key = "evt2_clean" + manifest.setpath(key, evt2_clean) + logger.info("Added '%s' to manifest: %s" % (key, manifest.get(key))) + + # Remove useless intermediate files + os.remove(evt2_chips) + os.remove(evt2_rmsrc) + + +if __name__ == "__main__": + main() |