Gravitational Wave Localization and Pointings: S230821bp [GraceDB]

Follow-Up

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GRB Coverage

Sources

Galaxies

Pointing Status


Information
Group Burst
Detectors H1,L1
Time of Signal 2023-08-21 16:44:49.950000 UTC
Time Sent 2023-08-21 16:45:32 UTC
False Alarm Rate once per 77579.52 s
50% Area 480.076 deg2
90% Area 2094.038 deg2
Central Frequency 1012.815491 Hz
Duration 0.00961 seconds

Coverage Calculator


Calculate the coverage of the GW localization over time, with choices to limit the coverage calculation to particular sets of instruments, wavelengths, or depth. All fields are optional, but cuts on depths must have an associated unit. If an empty form is submitted, the total reported coverage regardless of depth or band is computed. Once a HEALPIX pixel has been first covered, it is marked as done, to avoid double counting probability when the same field is covered multiple times. After clicking Calculate, be patient, it may take up to 2 minutes to fully compute the coverage profile.

Disclaimer: The DECam Footprint currently breaks in the calculator. We are temporarily approximating its coverage as a circle with 1 deg radius.


Instrument
Approximate For footprints with multiple ccd's this will approximate the calculator's input by using a simplified instrument footprint without chip-gaps. It is substantially faster, but does introduce a level of uncertainty in the resulting area and probability.
Depth Depth Unit
Band
Spectral Range Filter pointings based on their wavelength, energy, or frequency range Type: Range: - Unit


Renormalize Skymap


Removes pointings from the GW skymap and renormalizes the remaining probability mass, with choices to select particular sets of instruments, and/or pointings that cover certain wavelengths or depth. All fields are optional, but cuts on depths must have an associated unit. If an empty form is submitted, all completed pointings regardless of depth or band are removed from the skymap. Once a HEALPIX pixel has been first covered, it is marked as done, to avoid double counting probability when the same field is covered multiple times. After clicking Download, be patient, it may take up to 3 minutes to fully compute the renormalized skymap and download the HEALPIX fits file. Click Visualize to replace the 50% and 90% localization contours in the figure above with ones calculated from the renormalized skymap.

Disclaimer: The DECam Footprint currently breaks in the calculator. We are temporarily approximating its coverage as a circle with 1 deg radius.


Instrument: Completed and planned pointings to include from each instrument Completed Planned
Approximate For footprints with multiple ccd's this will approximate the calculator's input by using a simplified instrument footprint without chip-gaps. It is substantially faster, but does introduce a level of uncertainty in the resulting area and probability.
Depth Depth Unit
Band
Spectral Range Filter pointings based on their wavelength, energy, or frequency range Type: Range: - Unit