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VOT.py
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VOT.py
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#!/usr/bin/env python
import numpy as np
import json
from VOTUtils import initLogger
from VOTSpectrum import VOTSpectrum
from VOTResponse import VOTResponse
class VOT:
def __init__(self, source = "custom", input = "Plain", output = "Plain",
jsonString = '[]', dataOut = False, sparseData = False, **pars):
'''
There are several ways to run this code. You can provide
execute it by providing it one of the built in sources to see
what an example output looks like. Availalble built-ins
include 'PG1553', 'Crab', 'PKS2233' and '4C5517' (you must
give those exact strings. There are many options surrounding
each of the custom sources (for example, you can pass a
different redshift or average zenith angle). You can also
define a custom source by passing 'custom' to the source
variable. You'll then need to define the full spectral shape.
See '--help custom' for more details.
'''
self.logger = initLogger('VOT')
if (input == "JSON"):
jsonObject = json.loads(jsonString)
pars = jsonObject[0]
source = pars['source']
sources = {"PG1553" : self.calcPG1553,
"Crab" : self.calcCrab,
"PKS2233" : self.calcPKS2233,
"4C5517" : self.calc4C5517,
"custom" : self.calculateRateAndTime}
sources[source](**pars)
self.Print(output, dataOut, sparseData)
def calculateRateAndTime(self, eMin = 0.1, eMax = 100000, Nbins = 10000,
redshift = 0.1, eblModel = "Dominguez",
instrument = "VERITAS", zenith = 20,
spectralModel="PowerLaw", **spectralPars):
''' - custom source -
This is the main way to calculates the rate in a VHE
instrument based on an input spectral function.
Parameter Definitions
* eMin: minimum energy for the spectral calculations (GeV)
* eMax: maximum energy for the spectral calculations (GeV)
* Nbins: number of bins in the spectral calculations
* redshift: redshift of the object
* eblModel: [Dominguez, Simple, NULL]. Use 'NULL' if you
don't want any EBL absorption. Try '--help EBL'
for more details.
* instrument: [VERITAS]. Try '--help instrument' for more
details.
* zenith: average zenith angle of the observations (degrees)
* spectralModel: spectral shape of the source. See below
for more details.
* spectralPars: parameters of the spectral shape. See
below for more details
Details
eMin/eMax: Note that the underlying algorithms use the safe
energies of the experiments for the actual rate and time
calculation and not these values. These are just for the
underlying spectral calculations.
spectralModel: can choose between many of the 2FGL spectral
models along with some others. Current options include
[PowerLaw, PowerLaw2, BrokenPowerLaw, LogParabola,
HESSExpCutoff]. Try '--help spectrum' for more details.
spectralPars: the parameters of the model. In general the
variable names match those as in the 2FGL models found on the
FSSC website. See the underlying function VOTSpectrum.VOT for
more details. All energy units should be in 'GeV' and
differential fluxes in 's^-1 cm^-2 GeV^-1'. Try '--help
spectrum' for more details. If running from the command line
you'll need to supply all of the spectral parameters direclty
there.
'''
self.VS = VOTSpectrum([],[],eMin, eMax, Nbins, eblModel,redshift,spectralModel,**spectralPars)
self.VR = VOTResponse(instrument,zenith=zenith, azimuth=0, noise=4.07)
if(not self.VR.EASummary):
return
self.EACurve_interpolated = self.VR.interpolateEA(self.VS.EBins, self.VR.EACurve)
self.rate = self.VR.convolveSpectrum(self.VS.EBins,
self.VS.dNdE_absorbed,
self.EACurve_interpolated,
10**self.VR.EASummary['minSafeE'],
10**self.VR.EASummary['maxSafeE'])
def calcPG1553(self, eMin = 0.1, eMax = 100000, Nbins = 10000,
eblModel="Dominguez", instrument = "VERITAS", zenith=20, **pars):
'''This should return about 100 gammas/hour if you use the
defaults.'''
self.calculateRateAndTime(eMin, eMax, Nbins, 0.5, eblModel, instrument, zenith,
spectralModel="PowerLaw", N0 = 2.6e-9,
index=-1.66533, E0 = 2.4)
def calcCrab(self, eMin = 0.1, eMax = 100000, Nbins = 10000,
eblModel="Null", instrument = "VERITAS", zenith=20, **pars):
'''This should give out on the order of 660 gammas/hour if you use the
defaults.'''
self.calculateRateAndTime(eMin, eMax, Nbins,0.0, eblModel, instrument, zenith,
spectralModel="HESSExpCutoff", N0 = 3.76e-14,
index=-2.39, E0 = 1000., EC = 14000.)
def calcPKS2233(self, eMin = 0.1, eMax = 100000, Nbins=10000,
eblModel="Dominguez", instrument = "VERITAS", zenith=40, **pars):
'''This should give out on the order of 0.98 gammas/hour if you use
the defaults.'''
self.calculateRateAndTime(eMin, eMax, Nbins, 0.325, eblModel, instrument, zenith,
spectralModel="PowerLaw2", N = 3.8e-9,
index=-2.23955, E1 = 1.0, E2 = 100.)
def calc4C5517(self, eMin = 0.1, eMax = 100000, Nbins=10000,
eblModel="Dominguez", instrument = "VERITAS", zenith=20, **pars):
self.calculateRateAndTime(eMin, eMax, Nbins, 0.8955, eblModel, instrument,
zenith, spectralModel="LogParabola", N0 = 1.359e-11,
alpha=-1.8772, beta=-0.067012, Eb = 0.9085)
def Print(self, style = "Plain", dataOut = False, sparseData = False):
Emin = 10**self.VR.EASummary['minSafeE']
Emax = 10**self.VR.EASummary['maxSafeE']
crabFlux = 100*self.rate*60./self.VR.crabRate
detTime = np.interp([crabFlux*0.01], self.VR.SensCurve[:,0], self.VR.SensCurve[:,1])
if(style == "Plain"):
self.logger.info("Using " + self.VR.EAFile)
self.logger.info("Using " + self.VR.EATable)
self.logger.info("Safe energy range: {:,.2f} to {:,.2f} GeV".format(Emin, Emax))
self.logger.info("dNdE at 1 GeV: {:,.2e} s^-1 cm^-2 GeV^-1".format(np.interp(1.,
self.VS.EBins,
self.VS.dNdE)))
self.logger.info("dNdE at 400 GeV: {:,.2e} s^-1 cm^-2 GeV^-1".format(np.interp(400.,
self.VS.EBins,
self.VS.dNdE)))
self.logger.info("dNdE at 1 TeV: {:,.2e} s^-1 cm^-2 GeV^-1".format(np.interp(1000.,
self.VS.EBins,
self.VS.dNdE)))
self.logger.info("tau at min safe E: {:,.2f}".format(np.interp(Emin,
self.VS.EBins,
self.VS.interpolated_taus[0:,0])))
self.logger.info("tau at max safe E: {:,.2f}".format(np.interp(Emax,
self.VS.EBins,
self.VS.interpolated_taus[0:,0])))
self.logger.info("Predicted counts/hour: {:,.2e}".format(self.rate*60.))
self.logger.info("This is approximately {:,.4f}% of the Crab Nebula's Flux".format(crabFlux))
self.logger.info("This will take approximately {:,.4f} hours to detect at a 5 sigma level".format(detTime[0]))
if(style == "JSON"):
if dataOut:
spectrum = np.dstack((self.VS.EBins, self.VS.dNdE))[0].tolist()
spectrum_abs = np.dstack((self.VS.EBins, self.VS.dNdE_absorbed))[0].tolist()
tau = np.dstack((self.VS.EBins, self.VS.interpolated_taus[0:,0]))[0].tolist()
ea = np.dstack((self.VS.EBins, self.EACurve_interpolated))[0].tolist()
if sparseData:
span = 10
else:
span = 1
print json.dumps([{"EAFile" : { "unit": "file name", "value": self.VR.EAFile},
"EATable": {"unit": "table name", "value": self.VR.EATable},
"Emin": {"unit": "GeV", "value": Emin},
"Emax": {"unit": "GeV", "value": Emax},
"Rate": {"unit": "counts/hour", "value": self.rate*60.},
"Crab": {"unit": "% Crab", "value": crabFlux},
"DetTime": {"unit": "Hours", "value":detTime}},
{"name" : "Spectrum",
"xaxis" : "E (GeV)",
"yaxis" : "dNdE (s^-1 cm^-2 GeV^-1)",
"data": spectrum[::span]},
{"name" : "Absorbed Spectrum",
"xaxis" : "E (GeV)",
"yaxis" : "dNdE (s^-1 cm^-2 GeV^-1)",
"data": spectrum_abs[::span]},
{"name" : "Tau",
"xaxis" : "E (GeV)",
"yaxis" : "Tau (Arb.)",
"data": tau[::span]},
{"name" : "Effective Area",
"xaxis" : "E (GeV)",
"yaxis" : "Area (cm^2)",
"data": ea[::span]},
])
else:
print json.dumps([{"EAFile" : { "unit": "file name", "value": self.VR.EAFile},
"EATable": {"unit": "table name", "value": self.VR.EATable},
"Emin": {"unit": "GeV", "value": Emin},
"Emax": {"unit": "GeV", "value": Emax},
"Rate": {"unit": "counts/hour", "value": self.rate*60.},
"Crab": {"unit": "% Crab", "value": crabFlux},
"DetTime": {"unit": "Hours", "value":detTime[0]}},
])
def printCLIHelp(**opts):
import os
import sys
"""This function prints out the help for the CLI."""
if(opts):
if(opts["subhelp"]):
if(opts["subhelp"] == "spectrum"):
print VOTSpectrum.Spectrum.__doc__
elif(opts["subhelp"] == "EBL"):
print VOTSpectrum.helpEBL.__doc__
elif(opts["subhelp"] == "instrument"):
print VOTResponse.loadEA.__doc__
elif(opts["subhelp"] == "custom"):
print VOT.calculateRateAndTime.__doc__
elif(opts["subhelp"] == "sources"):
print VOT.__init__.__doc__
else:
print "Unknown help option"
printCLIHelp()
else:
cmd = os.path.basename(sys.argv[0])
print """
- VHEObserversTools -
Calculate rates in a VHE detector given an input source function, a
given EBL model and redshift and VHE effective areas.
%s (-h|--help) ... This help text. You can also get help for specific
things by typing '--help spectrum', '--help EBL', '--help
instrument', '--help sources' or '--help custom'.
%s (--source = <source>) ... <source> can be a built-in source
('Crab', 'PG1153', '4C5517' or 'PKS2233') or custom (user-inputed
spectrum). See '--help sources' or '--help custom' for more details.
%s (--input = <input>) ... <input> can be 'Plain' (default) or 'JSON'.
If the input is 'JSON' you must supply a json string via the
'jsonInput' option.
%s (--output = <output>) ... <output> can be 'Plain' (default) or
'JSON'. Prints the result out with plain descriptive text or as a
json string. The json string also includes all of the data arrays.
%s (--jsonInput = <jsonString>) ... <jsonString> is a well formatted
json string used for json input. As an example, this is a json
string for a custom source which could be used as input:
'[{"source":"custom", "eMin":0.1, "eMax":100000, "Nbins":10000,
"redshift":0.8955, "eblModel":"Dominguez","instrument":"VERITAS",
"zenith":20, "spectralModel":"LogParabola", "N0":1.359e-11,
"alpha":-1.8772, "beta":-0.067012, "Eb":0.9085}]'
%s (--dataOut) ... If this is present, the various arrays used for
calculations are outputted in the json string as three arrays. One
is the spectrum, one is the absorbed spectrum, one are the tau values
and the last is the effective area curve. Each json element contains
a 'name' element (the name of the array), an 'xaxis' element (the
name and units of the x axis variable), a 'yaxis' element (the name
and units of the y axis variabl) and a 'data' element (the data as
x,y pairs).
%s (--sparseData) ... If this is present, the outputted data arrays
will be sparse (every 10th element).
""" %(cmd, cmd, cmd, cmd, cmd, cmd, cmd )
def cli():
import getopt
import sys
"""Command line interface. Call this without any options for usage
notes."""
try:
opts, args = getopt.getopt(sys.argv[1:], 'h', ['help=',
'source=',
'input=',
'output=',
'jsonInput=',
'dataOut',
'sparseData',
])
source = "custom"
input = "Plain"
output = "Plain"
jsonString = '[]'
dataOut = False
sparseData = False
for opt, val in opts:
if opt in ('-h'):
printCLIHelp()
if opt in ('--help'):
printCLIHelp(subhelp=val)
return
if opt in ('--source'):
source = val
if opt in ('--input'):
input = val
if opt in ('--output'):
output = val
if opt in ('--jsonInput'):
jsonString = val
if opt in ('--dataOut'):
dataOut = True
if opt in ('--sparseData'):
sparseData = True
if not opts: raise getopt.GetoptError("Must specify an option, printing help.")
VOT(source, input, output, jsonString, dataOut, sparseData)
except getopt.error as e:
print "Command Line Error: " + e.msg
printCLIHelp()
if __name__ == '__main__': cli()