Possible Observation of a gamma-Ray Burst at Radio Frequencies
Abstract
N. Mandolesi, G. Morigi, P. Inzani, G. Sironi, F. S. Delli Santi, F. Del Pino and M. Petessi, Consiglio Nazionale Ricerche at Bologna, Milan and Palermo and Bologna Astronomical Observatory, report: "On Aug. 16 a burst of electromagnetic radiation was detected at 151, 323, 330 and 408 MHz with the radio telescope at Medicina. About 60s earlier a gamma-ray burst was detected by five satellites (T. Cline, H. Helmken and R. W. Klebesadel, private communications) and by a balloon-borne x-ray experiment on the second transatlantic flight (M. Sommer, private communication). Independent radio observations at 237 MHz by A. Abrami at the Trieste Astronomical Observatory and fair weather conditions exclude local origin and atmospheric disturbances. The probability of random coincidence between radio and gamma-ray data is 8 x 10**-5. The radio pulse characteristics are: onset time 16h16m25s UT, duration 30s, time delay between pulses at extreme frequencies < 10s (limit set by paper chart recorder resolution). The location of the source has a suggested error circle of radius ~ 20o centered on the position of the sun (R.A. = 9h42m, Decl. = +14o.8), but it is not within ~ 8o of the position of the sun."
- Publication:
-
International Astronomical Union Circular
- Pub Date:
- December 1976
- Bibcode:
- 1976IAUC.3017....2M