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Early-time observations of gamma-ray burst error boxes with the Livermore optical transient imaging system

Posted on:2001-11-22Degree:Ph.DType:Dissertation
University:Clemson UniversityCandidate:Williams, George GrantFull Text:PDF
GTID:1468390014458100Subject:Physics
Abstract/Summary:
Approximately three times per day a bright flash of high energy radiation from the depths of the universe encounters the Earth. These gamma-ray bursts (GRBs) were discovered circa 1970 yet their origin remains a mystery. Traditional astronomical observations of GRBs are hindered by their transient nature. They have durations of only a few seconds and occur at random times from unpredictable directions.; In recent years, precise GRB localizations and rapid coordinate dissemination have permitted sensitive follow-up observations. These observations resulted in the identification of long wavelength counterparts within distant galaxies. Despite the wealth of data now available the physical mechanism which produces these extremely energetic phenomena is still unknown. In the near future, simultaneous and early-time optical observations of GRBs will aid in constraining the theoretical models.; The Livermore Optical Transient Imaging System (LOTIS) is an automated robotic wide field-of-view telescope dedicated to the search for prompt and early-time optical emission from GRBs. Since routine operations began in October 1996 LOTIS has responded to over 145 GRB triggers. LOTIS has not yet detected optical emission from a GRB but upper limits provided by the telescope constrain the theoretical emission mechanisms.; Super-LOTIS, also a robotic wide field-of-view telescope, is 100 times more sensitive than LOTIS. Routine observations from Steward Observatory's Kitt Peak Station will begin in the immediate future. During engineering test runs Super-LOTIS obtained its first upper limit on the early-time optical afterglow of GRBs.; An overview of the history and current state of GRBs is presented. Theoretical models are reviewed briefly. The LOTIS and Super-LOTIS hardware and operating procedures are discussed. A summary of the results from both LOTIS and Super-LOTIS and an interpretation of those results is presented. Plans for future studies with both systems are briefly stated.
Keywords/Search Tags:LOTIS, Observations, Optical, Early-time, Transient, Super-lotis
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