Python project to read CHIME/FRB Data
CHIME/FRB Open Data
Read utilties for CHIME/FRB Open Data Release.
pip install cfod
Note: Currently only
Python 2.7 is supported.
To read a single data file from the data release,
from cfod import chime_intensity as ci fn = `astro_5941664_20180406203904337770_beam0147_00245439_02.msgpack` intensity, weights, fpga0, fpgaN, binning, frame0_nano, nrfifreq, rfi_mask = ci.unpack_data(fn)
intensityis a 2D Intensity array.
weightsare the corresponding 2D array weights to the intensity array.
fpga0 (int)is start fpga count of the data chunk. (Internally used to track time, can be ignored). The fpga count increments at the rate of 2.56us.
fpgaN (int)is number of fpga counts in the data chunk read
binning (int)is the downsampling of the data from the ringbuffer
frame0_nanois the conversion from fpga timestamp to utc timestamp (Currently not supported.)
nrfifreqis the number of frequences masked by the realtime rfi system (Currently not supported.)
rfi_maskis currently not supported
To read multiple data files at once, you can use the following command,
from cfod import chime_intensity as ci fns = ['file1', 'file2', 'file3'] intensity, weights, fpga0s, fpgaNs, binning, rfi_mask, frame0_nanos = ci.unpack_datafiles(fns)
.msgpack files into filterbank
.fil format you can run
msgpack2fil from the command line. You need to provide a pathname wildcard in quotation marks. To see all command line options run help:
CHIME/FRB data has 16384 frequency channels but PRESTO and sigproc by default allocate memory for only a maximum of 4096 channels. You would need to update
header.h in sigproc and recompile before trying to read a 16384 filterbank file, or you can let
msgpack2fil subband data by at least a factor 4 (using the
--fscrunch argument). Make sure to provide a DM for subband dedispersion (using the
--subdm argument) to mitigate subband smearing.
pip uninstall cfod
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