Localized Sources of Gamma-Rays of 3 TO 25 Mev.

Gamma rays from the region of the galactic anticenter were measured using a double Compton scatter gamma ray telescope flown on a balloon to 3.0 g/sq cm residual atmosphere. Measurements suggest a narrow energy interval, perhaps an O-16 6.1 MeV nuclear transition line, in which the flux is above the level predicted by extrapolation of the power law into the 5-10 MeV interval from lower and higher energies. Upper limits for a number of possible point sources in the energy interval of 3-25 MeV are given with the 2 sigma limit for NGC 4151 of 6.1 x 10 to the -3 power photons (sq cm/sec). The intensity of the pulsed emission from the Crab Pulsar, NPO532, is 4.3 plus or minus 2.6 x 10 to the minus 4 power photons (sq cm/sec) at 3-30 MeV consistent with results of other observations. An upper limit is placed on pulsed emission from AO535+26 and CG195+5 for periods from 102-106 sec and 57-60 sec, respectively.