Unidentified Flying Objects: Project "Grudge" (Technical Report No. 102-AC 49/15-100)

## GENERAL PROCEDURES

The method of the investigation was to examine a number of individual reports of unidentified aerial and celestial objects, to determine which of them could be explained on purely astronomical lines — that is, how many cases give evidence corresponding to dee scriptions of meteors, fireballs or bolides, comets, the planets, or even the sun or moon. Analysis was based entirely upon these reports, furnished by Project JBLDU offline, with no attempt to make independent interrogation of witnesses, since this was not authorized under the contract. Nor was any attempt made to deduce explanations for the non-astronomical incidents, although hypotheses which appeared possible from the evidence were noted.

The subject reports number 244 and cover, approximately, the period from January, 1947, to January, 1949. They do not, however, correspond exactly to the number of separate incidents; sometimes, two or more reports refer to the same object observed by different people (although in general such cases have been handled by affixing letters to the incident numbers, thus 33, 33a, 33b); occasionally, subdivisions of one number patently refer to separate phenomena. To avoid confusion, one report is being submitted by this investigator for each numbered incident, with cross references for identical or similar incidents, and separate discussions for those including more than one phenomenon.

least such as the around object of the investigation was

UNCLASSIFIED