{
  "bibcode": "2005GCN..3950....1D",
  "body": "D. T. Durig, N. P. McLarty and J. R. Manning (Cordell-Lorenz \nObservatory) report on behalf of the AAVSO International High Energy \nNetwork on optical observations of GRB050908 (GCN #3942; Goad et al.):\n\nThe optical afterglow reported by K. Torii (GCN #3943) was detected and \nits fading behaviour was confirmed with observations starting 14 minutes \nafter the Swift trigger. Full details and URL to the FITS image are below.\n\nThe AAVSO thanks the Curry Foundation for support of the AAVSO \nInternational High Energy Network.\n\nReport filed on Thu Sep  8 06:22:58 2005:\n\n Name: Dr. Douglas T. Durig\n email: ddurig@sewanee.edu\n Observer: D. T. Durig, N. P. McLarty, J. R. Manning\n Site: Cordell-Lorenz Observatory\n Location: Sewanee, Tenn., USA\n LatitudeLongitude: 35 12 N 85 55 W\n Elevation: 600 m\n Scope: SCT 0.30 m\n ScopeFocalRatio: 1770 mm f/5.9\n CCDVendor: SBIG ST-8E\n CCDDetector: KAF 1600\n CCDSize: 1530x1020, binned 3x3\n CCDPixelScale: 3.15 arc sec\n CCDFOV: 26.7 x 17.8 arc min/13.35x8.9 shown\n Object: GRB050908\n ObsDate: 2005 09 08\n ObsMidPointTime: 07:59:09\n TimePerFrame: 300 sec\n NumberOfFrames: 48\n Filters: CR\n Processing: dark, flat, register, add, 1/2 frame crop\n Seeing: ~5 arc sec\n LimitingMag: ~21.5-22 ???\n Sky: mostly clear, occasional high clouds, no wind\n afterglowmag: 19th fading to 21st\n afterglowerr: 0.3 mag\n compstars: 310 USNO B1.0 stars in field\n\n Report: I had to use my backup CCD because my primary is in for repair. \nI started imaging at 05:56:39 ( 2453621.7477 JD ) and did 30 x 300 sec \nexposures followed by an additional 18. I was analysing the first 10 and \nhad identified the potential candidate on my own. I was checking the \nfading behaviour when GCN 3943 from Torii announced the same candidate. \n\nI then used my first 20 frames added in sets of 5 to confirm clear \nfading \nbehaviour:\n\n8.25483 01 21 50.72 -12 57 17.4 19.3 R \n8.27272 01 21 50.73 -12 57 17.0 19.8 R \n8.29063 01 21 50.69 -12 57 17.1 20.4 R  \n8.30853 01 21 50.79 -12 57 17.0 21.0 R \n\nI then used sets of 10 and 20 to get later data points for the full set \nof images.\n\nFull data set:\n\n08.25483 01 21 50.72 -12 57 17.4 19.3 R      850\n08.26378 01 21 50.72 -12 57 17.2 19.6 R      850\n08.27272 01 21 50.73 -12 57 17.0 19.8 R      850\n08.28168 01 21 50.71 -12 57 17.2 19.9 R      850\n08.29063 01 21 50.69 -12 57 17.1 20.4 R      850\n08.29958 01 21 50.67 -12 57 17.8 20.7 R      850\n08.33539 01 21 50.73 -12 57 15.8 20.2 R      850\n08.35454 01 21 50.69 -12 57 16.9 21.0 R      850\n08.37369 01 21 50.64 -12 57 18.1 21.4 R      850\n\nA FITS image has been uploaded to: \nftp://ftp.aavso.org/grb/Dr.DouglasT.Durig_GRB050908_2453621.93262_.fits",
  "circularId": 3950,
  "createdOn": 1126191550000,
  "email": "oksanen@nyrola.jklsirius.fi",
  "subject": "GRB 050908: Optical observations",
  "submitter": "Arto Oksanen at Nyrola Obs., Finland  <oksanen@nyrola.jklsirius.fi>",
  "eventId": "GRB 050908"
}