GRB 050525a Optical follow-up
MDM 2.4m RETROCAM - SDSS r' Filter|
|(J2000) 18h 32m 32s.58 +26° 20' 22.6" (2.2 x 2.2 arcmin)|
|GCN Circular #3488
GRB 050525a: MDM Observations
N. Mirabal (U. Michigan), D. Bonfield and K. Schawinski (U. Oxford), report on behalf of the MDM GRB follow-up team: "Continuous r'-band photometry of the GRB 050525a afterglow (Rykoff et al. GCN #3465) was obtained with the RETROCAM imager (Morgan et al., astro-ph/0502274) installed on the MDM 2.4m telescope. The data consists of ~120 points spanning from 4.4 hr to 11.6 hr after the burst. During this period, the magnitude of the optical afterglow is seen to decline from R~18.5 to R~19.6, referenced to the R~17.2 USNO star listed by Rykoff et al. (GCN #3468). A fit to the latter part of the observations yields a power-law decay slope of -1.38+/-0.2, consistent with a tentative steepening of the decay after ~0.4 days. Further analysis is in progress. A graph of the preliminary differential magnitude light curve is available at http://www-personal.umich.edu/~mirabal/grb050525/lightc.ps"
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