Browsing by Author "Larson, S."
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- ItemCRTS: An Open Optical Transient Survey(2011) Drake, Andrew J.; Djorgovski, S. G.; Mahabal, A.; Williams, R.; Graham, M. J.; Donalek, C.; Prieto, J. L.; Catelan, Márcio; Beshore, E.; Larson, S.; Christensen, E.The Catalina Real-time Transient Survey (CRTS) is an open optical transient survey that covers 3/4 of the entire sky in a search of transient astrophysical phenomena occurring on timescales of minutes to years. Observational data is derived from the three telescopes of the Catalina Sky Survey which cover up to 2,500 square degrees of sky each night. CRTS has so far discovered more that 2000 transient sources including 600 supernovae, 500 dwarf novae and more than 100 Blazars and UV Ceti variables. All data is processed within minutes of observation and discoveries are openly distributed using SkyAlert and VOEvent technologies as well as iPhone, html tables, RSS and Twitter feeds. Events are classified utilizing data from virtual observatory enabled archives, machine learning, and collaborative Citizen science....
- ItemDiscovery of ~9000 new RR Lyrae in the southern Catalina surveys(2015) Torrealba, G.; Catelan, Márcio; Drake, A. J.; Djorgovski, S. G.; McNaught, R. H.; Belokurov, V.; Koposov, S.M.; Graham, M. J.; Mahabal, A.; Larson, S.; Christensen, E.
- ItemResults from the Catalina Real-time Transient Survey(2009) Drake, Andrew J.; Djorgovski, S. G.; Mahabal, A. A.; Graham, M.; Williams, R.; Catelan, Marcio; Beshore, E.; Larson, S.; Christensen, E.The Catalina Real-time Transient Survey (CRTS) is a collaborative effort between Caltech and LPL that uses data from Catalina Sky Survey's 0.7m Schmidt telescope to search for optical transients. This survey currently covers a total of 26,000 square degrees on the sky between declinations -30 and 70. Observations covering 1200 square degrees are taken 21 nights per lunation and reach magnitudes of 19 to 20. CRTS is sensitive to transients with timescales from minutes to years since images are taken in sequences separated by 10 minutes and past observations date back over four years. Transient classification is performed using follow up imaging and spectroscopy in combination with VO-enabled archival analysis of CSS and Palomar Quest synoptic datasets and DSS, 2MASS, SDSS, GALEX and UKIDSS surveys. To date more than 600 unique transients have been identified by CRTS. These include more than 200 newly discovered Supernovae, Cataclysmic Variables and Blazars. Initial results of note include in the discovery of hyper-luminous supernovae, as well as a high rate of supernovae associated with intrinsically faint galaxies. In the near future we expect to expand the survey area and depth by utilizing data from two additional operational Catalina Sky Survey telescopes. All CRTS transients are discovered and distributed openly within minutes of observation using VOEvent technology as well as html tables, RSS feeds and GoogleSky (from VOEventNet.org). Astronomers will soon be able to automatically select transients of particular interest by using the personalized event selection available via the SkyAlert system....
- ItemResults From The First Year Of The Catalina Real-time Transient Survey(2009) Drake, Andrew J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Catelan, Marcio; Beshore, E.; Larson, S.; Christensen, E.The Catalina Real-time Transient Survey (CRTS) is a collaborative effort between Caltech and LPL that uses data from Catalina Sky Survey's 0.76m Schmidt telescope to search for optical transients (OTs) varying by more than two magnitudes between past and current data. The survey covers 26,000 square degrees on the sky between declination -30 and 70 at Galactic latitudes |b| > 10 deg. Sequences of four observations are taken separated by 10 minutes and cover 1200 square degrees each night for 21 nights per lunation. Observations reach transients at unfiltered magnitudes of 19 to 20. To date more than 400 unique OTs have been identified by CRTS. These transients include more than 150 supernovae and dwarf novae, as well as UV Ceti flares, high proper motion stars, comets, Miras and currently unidentified transients. Classification is carried out using follow up imaging and spectroscopy in combination with VO-enabled archival analysis of CSS and Palomar Quest synoptic datasets and DSS, 2MASS, SDSS, GALEX and UKIDSS surveys. All candidate OTs are published within 5 mins of observation and are openly accessible as VOEvents, html tables and RSS feeds (from VOEventNet.org). As part of our public outreach program, the CRTS event stream is also published in the event layer of Google Sky....
- ItemResults of a systematic search for outburst events in 1.4 million galaxies(2019) Drake, A.J.; Djorgovski, S.G.; Graham, M.J.; Stern, D.; Mahabal, A.A.; Catelan, Márcio; Christensen, S.; Larson, S.
- ItemThe Catalina Surveys Southern periodic variable star catalogue(2017) Drake, A. J.; Djorgovski, S. G.; Catelan, Márcio; Graham, M. J.; Mahabal, A. A.; Larson, S.; Christensen, E.; Torrealba, G.; Beshore, E.; McNaught, R. H.; Garradd, G.; Belokurov, V.; Koposov, S. E.
- ItemThe First Data Release of the Catalina Surveys(2012) Drake, Andrew J.; Beshore, E.; Djorgovski, S. G.; Larson, S.; Boattini, A.; Catelan, Marcio; Christensen, E.; Donalek, C.; Gibbs, A.; Graham, M.; Grauer, A.; Hill, R.; Kowalski, R.; Mahabal, A.; Prieto, J. L.; Williams, R.The Catalina Surveys consists of the Catalina Sky Survey (CSS) and the Catalina Real-time Transient Survey (CRTS). These two surveys work synergistically to extract the maximum scientific return from the data gathered by Catalina telescopes. In order to further facility the wealth of time-domain science that is possible with this data, the Catalina Surveys are now releasing Catalina Schmidt telescope photometry for 200 million objects. Each source has been measured over a period of six years and comes from a 24,000 square degree region between declination -30 and +70 degrees (with 10 degree avoidance of the galactic plane). On average each location in the data release has been observed more than 200 times to a depth of V=19.5. We will provide the details of the open-access data services as well as future data releases and recent discoveries....