GCN Circular 4023
Subject
GRB050922C: Optical Observations
Event
Date
2005-09-23T04:43:10Z (20 years ago)
From
Aaron Price at AAVSO <aaronp@aavso.org>
D. T. Durig (Cordell-Lorenz Observatory - University of the South) and A.
Price (AAVSO) report on behalf of the AAVSO International High Energy
network on optical observations of GRB050922C.
After glow reported by Rykoff et al (GCN #4011) was visible in 2 hours of
exposures. The first three measurements are below and a link to the rest
is in the full report at the bottom of the e-mail. Uncertainty is
estimated at +/-0.2 mag.
09 23.03833 19.1 Rc
09 23.07725 19.5 Rc
09 23.10989 20.1 Rc
The AAVSO would like to thank the Curry Foundation and NASA for their
support of the AAVSO International High Energy Network.
Name: Dr. Douglas T. Durig
email: ddurig@sewanee.edu
Observer: D. T. Durig, K. T. Crockett, L. R. Johnson
Site: Cordell-Lorenz Observatory
Location: Sewanee, TN, USA
LatitudeLongitude: 35 12 N 85 55 W
Elevation: 600 m
Scope: SCT 0.30 m
ScopeFocalRatio: f/5.9 1770 mm
CCDVendor: SBIG ST-8E
CCDDetector: KAF-1600E
CCDSize: 1530x1020 binned 3x3 for 510x340
CCDPixelScale: 3.14 arc sec per pixel
CCDFOV: 26.7x17.8 full, 13.3x8.9 cropped submitted
Object: GRB050922C
ObsDate: 2005 09 23
ObsMidPointTime: 01:51:14 UT
TimePerFrame: 300 sec
NumberOfFrames: best 24 out of 30
Filters: CR
Processing: dark,flat, register,co-add, 1/2 frame crop
Seeing: 5-6 arc sec
LimitingMag: ~21.5 ???
Sky: clear, but very gusty winds
afterglowmag: 19 fading to 20 over two hours time
afterglowerr: 0.2 mag
compstars: 94 UCAC, 188 B1.0 subframe
Report: Full frame covers entire error box. After glow reported by Rykoff et al (GCN 4011) was visible in single 300 sec exposure but 6 frames were added to improved S/N for measurements. We measure a position of
21 09 33.10 -08 45 30.2
First three photometric measurements shown below.
We have posted our first 2 hours of exposure at http://arthur.sewanee.edu/obsv/view.php
comments: 09 23.03833 21 09 33.10 -08 45 30.2 19.1 R
09 23.07725 21 09 33.12 -08 45 30.4 19.5 R
09 23.10989 21 09 33.12 -08 45 30.7 20.1 R
A FITS image has been uploaded to ftp://ftp.aavso.org/grb/Dr.DouglasT.Durig_GRB050922C_2453636.66853_.fits