Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21012116d&link_type=abstract
American Astronomical Society Meeting 210, #121.16; Bulletin of the American Astronomical Society, Vol. 39, p.330
Astronomy and Astrophysics
Astronomy
Scientific paper
We imaged the afterglow of GRB070125 on 2007 01 27 from around 3:30 UT until 8:10 UT, approximately 44 hours after the Gamma Ray Burst. We obtained 129 exposures of 120 seconds each. We used an SBIG ST-7XME on a 12 inch Meade LX200GPS SCT at f/4 with a 1210 mm focal length. Images were processed with a comparable dark frame and flat field and calibrated with the 63 UCAC 2.0 reference stars in the image frames. Introductory Astronomy students D. S. Hardage and N. M. Haymond were involved in the imaging. For an independent study project, J. C. Cockhren and E. B. Caton performed the detailed data analysis. We could just detect the afterglow on individual frames, but co-added sets of 10, 20 and 30 frames to increase the signal and reduce the noise. We used the reference star USNO A-2.0 Ra=117.80128d Dec=31.17685d (J2000) R=15.2 mag. There appears to be a slight re-brightening during our exposures on all co-added images sets, from 19.7 to 19.2 magnitude, with an average value of 19.5 magnitude. We measured a position of 07 h 51 m 17.74 s RA, +31 d 09 m 04.1 s Dec.
Caton E. B.
Cockhren J. C.
Durig Douglas T.
Hardage D. S.
Haymond N. M.
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