ReadMe File 6 January 2000 You have downloaded a gzipped, tar file containing data from the PLANET Collaboration paper entitled: Detection of Rotation in a Binary Microlens: PLANET Photometry of MACHO 97-BLG-41 M.D. Albrow, J.-P. Beaulieu, J.A.R. Caldwell, M. Dominik, B.S. Gaudi, A. Gould, J. Greenhill, K. Hill, S. Kane, R. Martin, J. Menzies, R.M. Naber, K.R. Pollard, P.D. Sackett, K.C. Sahu, P. Vermaak, R. Watson, A. Williams (The PLANET Collaboration) and H.E. Bond, I.M. van Bemmel This paper has been accepted for publication in volume 534 of the 2000 Astrophysical Journal and is also available through the electronic archives at http://babbage.sissa.it/abs/astro-ph/9910307. Please reference this article if you make use of these data. In addition to this ReadMe file, the tar file consists of 1 ascii data file. The data file contains the PLANET collaboration light curve for the Galactic bulge microlensing event MACHO 97-BLG-41, and is arranged as follows: col1 site/band Observing site and band in which data were taken 1 = SAAO 1m/I (Sutherland, SA) 2 = ESO/Dutch 0.9m/I (LaSilla, Chile) 3 = Canopus 1m/I (Canopus, Tasmania) 4 = CTIO 0.9m/I (Cerro Tololo, Chile) 5 = Perth 0.6m/I (Bickley, Western AU) 6 = SAAO 1m/V (Sutherland, SA) 7 = ESO/Dutch 0.9m/V (LaSilla, Chile) 8 = Canopus 1m/V (Canopus, Tasmania) col2 timestamp HJD - 2450000.0 at mid-exposure col3 flux Flux determined by ISIS 2.0 Units are such that flux = 1 corresponds to I (or V) = 20 in instrumental magnitudes for each site. Only the SAAO data have been been referred to a standard system via: I_c = -2.5*log(flux_1) + 20 - 1.97 V_J = -2.5*log(flux_6) + 20 + 0.02 The zero points of the other light curves are adjusted in the fitting process. See full article for details. col4 error Uncertainty in flux col5 flag 1 = DoPhot FWHM measurement available 0 = DoPhot FWHM measurement not available col6 FWHM Full width at half maximum of stellar image as reported by DoPhot For more information about this event, refer to the PLANET article above.