Identification and astrometry of variable stars in M3

We present identification and astrometry of all previously known or suspect ed variables along with the discovery of six new variables in the globular cluster M3. The number of the catalogized variables increased to 274 by inc luding all the confirmed, previously known variables and the new discoverie s. The precise and homogeneous astrometry, as well as the clarification of misapprehensions in the preceding identifications are done by using overlap ping fields from a wide-field Schmidt-camera, l-m RCC telescope, and HST ar chive observations from the center of the cluster. The astrometric position s can serve as a direct input to any photometry which needs the accurate ce nters of the variables.