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GWsky: tiling the skymap in Fields of View

NEW GWsky v5.0 only for python 3

Short Turorial to localize events and manage a FoV sequence with the GWsky_pointing.txt

GWsky presentation here

GWsky is an interactive Python script to generate a sequence of pointings given a specific Field of View (FoV). The script aims to split the large GW sky localization into several independent areas.

It defines a sequence of FoVs from a fixed position over the sky, e.g., starting from the highest probability pixel. The results are displayed in Aladin Sky Atlas using the SAMPIntegratedClient class.

The Aladin v10.076 is recommended Run it typing

                         java -Xmx2g -jar Aladin.jar

The airmass and the integrated probability are provided in real time. Moreover, specifying the ID of a catalog, a query to the Vizier database is sent and the relative items are listed in each FoV.

The FoVs are evenly spaced assuming that the shortest angular distance between two points on the celestial sphere is measured along a great circle that passes through both of them:


where (α1,δ1) and (α2,δ2) are the right ascensions and declinations of the two points on the sky.

Cardinal directions are allowed and the FoVs can be overlaid or separated from the default position following the user's selection. A GUI guides the user through the sequential steps

alt tag


GWsky runs under Python 3.x.x
astropy, numpy, matplotlib, healpy, scipy, astroquery, mocpy

Running it

>>> from GWsky import gwsky

Building from source

The development version can be obtained and installed from github:

$ git clone
$ cd GWsky
$ (sudo) python3 install

alt tag M. Branchesi, G. Greco and G. Stratta are supported by the Italian Ministry of Education, University and Research via grant FIRB 2012- RBFR12PM1F.


GWsky defines a sequence of Fields of View (FoV) from a fixed position over the sky





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