{
  "bibcode": "2005GCN..3340....1D",
  "body": "D.T. Durig (Cordell-Lorenz Observatory - The University of The South) reports on\nbehalf of the AAVSO International High Energy Network on optical observations of\nGRB050502A (GCN #3323, Gotz et al.):\n\nDurig reports the following rapidly fading behavior:\n\nDate (UT) Mag\n02.17880  19.8   \n02.18243  20.8   \n02.18606  20.3   \n02.18969  20.4   \n02.19331  20.5   \n02.19694  20.9   \n02.20056  21.4   \n02.20418  21.4   \n02.20781  21.0   \n02.21144  21.3   \n\nObservations were made unfiltered based on a V zeropoint. Uncertainly is +/- 0.4\nmagnitudes. Details of the observation are below along with a link to the co-added \nFITS image.\n\nFull Observation Details\nName: Dr. Douglas T. Durig\nemail: ddurig@sewanee.edu\nObserver: D. T. Durig ( CLW01)\nSite: Cordell-Lorenz Observatory\nLocation: Sewanee, TN, USA\nLatitudeLongitude: 35 12 N 85 55 W\nElevation: 600 m\nScope: SCT 0.30 m\nScopeFocalRatio: f/5.8     1766 mm FL\nCCDVendor: SBIG ST1001E\nCCDDetector: KAF1001E\nCCDSize: 1024x1024\nCCDPixelScale: 2.8 arc sec/ pixel\nCCDFOV: 48x48 full, 12x12 cropped submitted\nObject: GRB050502\nObsDate: 2005 05 02\nObsMidPointTime: 2.15912 (04 40 58 UT )\nTimePerFrame: 300 sec\nNumberOfFrames: 11\nFilters: CV\nProcessing: dark, flat, registered, added, quarter frame cropped\nSeeing: 4 to 5 arc sec\nLimitingMag (SNR=3): 21.0 ???\nSky: very clear\nafterglowmag: 20 fading to 21 during first hour\nafterglowerr: 0.4\ncompstars: 900 USNO B1.0 stars\nReport: I could see the afterglow candidate in my first few images but it was \nfading fast and I had to stack to see it well in later images.\n\nAve Position:13 29 46.28 +42 40 27.7\n\nI get the following magnitudes for co-added (10min) frames:\n\n02.17880  19.8   CV\n02.18243  20.8   CV\n02.18606  20.3   CV\n02.18969  20.4   CV\n02.19331  20.5   CV\n02.19694  20.9   CV\n02.20056  21.4   CV\n02.20418  21.4   CV\n02.20781  21.0   CV\n02.21144  21.3   CV\n\nA FITS image has been uploaded to \nftp://ftp.aavso.org/grb/Dr.DouglasT.Durig_GRB050502_2453492.77287_.fits\n\nThe AAVSO thanks the Curry Foundation for their continued support of the \nAAVSO International High Energy Network.",
  "circularId": 3340,
  "createdOn": 1115088156000,
  "email": "aaronp@aavso.org",
  "subject": "GRB050502A: Optical Observations",
  "submitter": "Aaron Price at AAVSO  <aaronp@aavso.org>",
  "eventId": "GRB 050502A"
}