SuperNovae Featured Project: Cadence Generator

the recent supernova in M82.

The recent supernova in M82. Image credit: UCL/University of London Observatory/Steve Fossey/Ben Cooke/Guy Pollack/Matthew Wilde/Thomas Wright

(Author: David Cinabro)

The LSST Deep Field Arbitrary Cadence Generator is a tool to enable fast simulations of the LSST deep field observations.  Input is a simple discription of the desired deep field observation campaign, fields RA and DEC, readout time and cadence per filter, and start and stop time of that set of observations.  It uses the OpsimObs package from Lynne Jones to generate the observing conditions for the desired observations, and then packages them into a simulation library, SIMLIB, which is used by SNANA to generate LSST supernova simulations.  Intermediate output is saved with all the observing conditions available for use by non-SNANA users.  There are a limited number of options for the deep field observing campaign (moon illumination limits, air mass limits, weather make up) that the user can control.

The package is a set of fortran code, shell scripts, documentation, and examples.  Users have to edit makefiles to use a local fortan compiler and a shell script to define directories where OpsimObs and data files are located.  It is limited to 100 observing fields and in no way should be considered as a replacement for the full simulation of the Opsim.  It does run very quickly, a SIMLIB for a 10 year 100 field 6 filter 2 day cadence observing campaign, is generated is less than an hour on a laptop.  Its results have been compared to the existing Opsim Deep Field observing campaigns and found to be compatible.  David Cinabro ( is the author, it has been available on the LSST DESC github since mid-2013.