[AAVSO-HEN] GRB Field Observation Report

[Apache]

 Report filed on Sat Apr  7 05:30:34 2007:

 Name: Arto Oksanen
 email: arto.oksanen at jklsirius.fi
 Observer: Arto Oksanen (OAR)
 Site: Hankasalmi (A91)
 Location: Jyväskylä, FInland
 LatitudeLongitude: 62.25N, 26.60E
 Elevation: 100 m
 Scope: RC 0.40 m
 ScopeFocalRatio: f8.4 / 3380 mm
 CCDVendor: SBIG STL-1001E
 CCDDetector: KAF-1001E
 CCDSize: 1024x1024
 CCDPixelScale: 1.45 
 CCDFOV: 25x25 arc min
 Object: GRB070406
 ObsDate: 2007-04-06
 ObsMidPointTime: 21:13 UT
 TimePerFrame: 60s
 NumberOfFrames: 20 (15 usable)
 Filters: Ic
 Processing: bias, dark, flat, median combine
 Seeing: 3.5
 LimitingMag: i=20.0
 Sky: varying, from good to cloudy
 afterglowmag: 
 afterglowerr: 
 compstars: sdss i=14.598
 Report: Observation started just a few minutes after the GCN notice, but as it was from ground analysis the burst was already 19 hrs old. Full Swift error box was covered with 20 one minute Ic filtered exposures. The best fifteen frames were median combined and compared visually with DSS2R image and SDSS color jpeg image (GCN 6248, Cool et.al.). No new objects were seen. 

Planned unfiltered frames were not taken because of worsening weather conditions.
 comments: A jpeg of the subframe centered to the GRB coordinates is available at:

http://murtoinen.dyndns.org/ccd/grb/grb070406/grb070406-median-Ic_subframe.jpg

Observation was performed remotelly with a robotic telescope.

A FITS image has been uploaded to ftp://ftp.aavso.org/grb/ArtoOksanen_GRB070406_2454197.89623_.fits