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These web services are the back-end of the MWA triggering system, described in detail Hancock et al, 2019 (https://ui.adsabs.harvard.edu/link_gateway/2019PASA...36...46H/EPRINT_PDF)

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  • ra and dec: Specify a target coordinate in J2000 coordinates. Each can be either a single value (in degrees), or a JSON encoded list of values in degrees to specify more than one target. If so, the number of elements in the 'ra' and 'dec' lists must be equal.
  • alt and az: Specify a target coordinate in altitude/elevation and azimuth.  Each can be either a single value (in degrees), or a JSON encoded list of values in degrees to specify more than one target. If so, the number of elements in the 'alt' and 'az' lists must be equal.
  • source: A string specifying a source name, or a JSON encoded list of source names (to be resolved by the name resolver in astropy.coordinates).
  • subarrays: A JSON encoded list of pre-defined MWA subarray names. If provided, the number of subarray names must be equal to the total number of observing targets provided (all ra/dec, alt/az and source names), and one of the given subarrays will be assigned to each of the target positions provided. If the subarrays parameter is NOT provided, then the MWA will observe each of the provided target positions in turn, with the entire array. Defaults to empty (no subarrays).

The rest of the observations provide the rest of the observation details:

  • freqspecs: A single MWA coarse channel selection specifier (eg '121,24' for 24 coarse channels centered on channel 121), or a JSON encoded list of several channel selection strings. If more than one is provided, multiple observations of each specified target location will be taken, for each frequency channel set provided (as well as one at each frequency for the post-observation calibrator, if specified). Defaults to '145,24'.
  • creator: The name of the person or system generating this trigger - an arbitrary string. Defaults to 'djmwa/trigger'.
  • freqres: Frequency resolution for the correlator, in kHz - must be one of the standard MWAX settings. Defaults to 10.0 kHz.
  • inttime: Integration time for the correlator, in seconds - must be one of the standard MWAX settings. Defaults to 0.5 seconds.
  • avoidsun: Boolean, integer, or string (eg 'y', 'n', etc) - if true, try to put the Sun in a beam null for each target location (except alt/az positions). Defaults to False.
  • obsname: The name the observation to be inserted (another arbitrary string). Defaults to 'trigger'.
  • exptime: The duration of each individual observation (for each observing target, at each frequency channel selection). Defaults to 120 seconds.
  • nobs: The number of observations (Valid subarray names currently include 'all_north', 'all_south', 'all_east' and 'all_west' (each including approximately half the tiles in the array), as well as 'all_ne', 'all_nw', 'all_se', and 'all_sw' (each including approximately one quarter of the tiles in the array).

The rest of the observations provide the rest of the observation details:

  • freqspecs: A single MWA coarse channel selection specifier (eg '121,24' for 24 coarse channels centered on channel 121), or a JSON encoded list of several channel selection strings. If more than one is provided, multiple observations of each specified target location will be taken, for each frequency channel set provided (as well as one at each frequency for the post-observation calibrator, if specified). Defaults to '145,24'.
  • creator: The name of the person or system generating this trigger - an arbitrary string. Defaults to 'djmwa/trigger'.
  • freqres: Frequency resolution for the correlator, in kHz - must be one of the standard MWAX settings. Defaults to 10.0 kHz.
  • inttime: Integration time for the correlator, in seconds - must be one of the standard MWAX settings. Defaults to 0.5 seconds.
  • avoidsun: Boolean, integer, or string (eg 'y', 'n', etc) - if true, try to put the Sun in a beam null for each target location (except alt/az positions). Defaults to False.
  • obsname: The name the observation to be inserted (another arbitrary string). Defaults to 'trigger'.
  • exptime: The duration of each individual observation (for each observing target, at each frequency channel selection). Defaults to 120 seconds.
  • nobs: The number of observations (for each observing target, at each frequency channel selection). The total observing time (if not using subarrays) will be nobs * (number of target locations) * (number of frequency specifiers) * exptime (not including calibrator observations). Defaults to 15 observations.

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  • ra and dec: Specify a target coordinate in J2000 coordinates. Each can be either a single value (in degrees), or a JSON encoded list of values in degrees to specify more than one target. If so, the number of elements in the 'ra' and 'dec' lists must be equal.
  • alt and az: Specify a target coordinate in altitude/elevation and azimuth.  Each can be either a single value (in degrees), or a JSON encoded list of values in degrees to specify more than one target. If so, the number of elements in the 'alt' and 'az' lists must be equal.
  • source: A string specifying a source name, or a JSON encoded list of source names (to be resolved by the name resolver in astropy.coordinates).
  • subarrays: A JSON encoded list of pre-defined MWA subarray names. If provided, the number of subarray names must be equal to the total number of observing targets provided (all ra/dec, alt/az and source names), and one of the given subarrays will be assigned to each of the target positions provided. If the subarrays parameter is NOT provided, then the MWA will observe each of the provided target positions in turn, with the entire array. Defaults to empty (no subarraysnames), and one of the given subarrays will be assigned to each of the target positions provided. If the subarrays parameter is NOT provided, then the MWA will observe each of the provided target positions in turn, with the entire array. Defaults to empty (no subarrays). Valid subarray names currently include 'all_north', 'all_south', 'all_east' and 'all_west' (each including approximately half the tiles in the array), as well as 'all_ne', 'all_nw', 'all_se', and 'all_sw' (each including approximately one quarter of the tiles in the array).

The rest of the observations provide the rest of the observation details:

...