The Dark Energy Survey Supernova Program (DES-SN) publishes its brighter (r ≲ 20) transient candidates here, and encourages other observers to follow them up. As a courtesy, we also request that observers who do follow-up transients listed here inform DES-SN by sending an email to firstname.lastname@example.org.
Coordinates, photometry, and subtraction postage stamps are available to help users decide what candidates interest them most. Finder charts with offset stars are provided to facilitate follow-up.
DES-SN is a search for astrophysical transients in which ten 3-deg2 fields are repeatedly observed by the Dark Energy Camera (DECam) in g,r,i,z passbands with a cadence of about one week. The observing strategy has been optimized to measure high-quality light curves and redshifts for thousands of Type Ia supernovae with the goal of measuring Dark Energy parameters.
Field name letters are E for Elais S1, S for SDSS Stripe 82, C for CDFS, and X for XMM-LSS. Coordinates at the center of each 3-deg2 field are listed below.
Exposure sequences (number of exposures times exposure time in seconds) for shallow and deep fields are listed below.
|Shallow||1 x 175s||1 x 150s||1 x 200s||2 x 200s|
|Deep||3 x 200s||3 x 400s||5 x 360s||11 x 330s|
The above field definitions and exposure times are up-to-date as of 2015-09-30. Refer to Kessler et al. (2015) for more details.
Transients identified by DES-SN are given names according to a familiar scheme:
The above example corresponds to a transient in the X2 field, the 731st transient identified by DES-SN in 2015. The alphabetic suffix is re-started at the beginning of each observing season, and a suffix is not used again until the following year.
The search box accepts partial candidate names. If multiple candidates match a partial name, up to 30 matches are listed for the user to narrow down within.
DES is designed to probe the origin of the accelerating Universe and help uncover the nature of Dark Energy by measuring the 14-billion-year history of cosmic expansion with high precision. More than 300 scientists from 25 institutions in the United States, Spain, the United Kingdom, Brazil, Germany, and Switzerland are working on DES.
DES has built and deployed an extremely sensitive 570-Megapixel digital camera, called DECam, on the Blanco 4-meter telescope at Cerro Tololo Inter-American Observatory (CTIO) in the Chilean Andes. Nightly, up to 170 GB of DES-SN survey exposures are transferred from CTIO to the National Center for Supercomputing Applications (NCSA) where they are processed and differenced against template images from previous years. A machine learning classifier separates potentially real astrophysical transients from various detector and mis-subtraction artifacts. The entire process is complete in a matter of hours.
Peer-reviewed publications incorporating observations of transients advertised here should acknowledge DES and CTIO. Please include acknowledgement text from here and cite the following relevant articles: