445 The tranamission measunements vere carried out successfully to H -6.5 seconis, The latter corresponis to the last available light pulse as the lipht source was extinguished on the H-5 second signal. ' RISCUSSION The thermel data appears to be very interesting, in particular, in the infra-red region; thit is, the duration of the thermal pulse was about 5 seconis as compare’ to the blue region which had a duTatiua of avour 2.5-3 seconds, This difference has not appeared on broad band calorimeters as their sensitivity is considerably lower than that of the spectrometer system employed here. Further, this lends credence to the theory that the hot shocked gases within the fireball at later times are still oapable of emitting significant amounts of ratiation in infra-rel regions of 1-3 aicrons. ABLE COPY