CHIME/FRB Open Data

Read utilties for CHIME/FRB Open Data Release.

Installation

pip install cfod

Note: Currently only Python 2.7 is supported.

Usage

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)

where:

• intensity is a 2D Intensity array.
• weights are 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_nano is the conversion from fpga timestamp to utc timestamp (Currently not supported.)
• nrfifreq is the number of frequences masked by the realtime rfi system (Currently not supported.)
• rfi_mask is 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)

Removal

pip uninstall cfod