Abstract
Upper limits for the time-averaged flux of air showers from the direction of Cygnus X-3 during the calendar period 2 April 1986 to 3 May 1987 are found to be 1.5× for all events, and 7.6× for events with no observed muons in a 44- muon detector. These are integral fluxes above 50 TeV on the assumption of an primary spectrum. A possible observation of a short-term signal from Cygnus X-3, with an anomalous muon content, phase correlated with the 4.8-h orbital period, with an integral flux above 50 TeV of (8.2±2.0)× is also reported.
- Received 9 December 1987
DOI:https://doi.org/10.1103/PhysRevLett.60.1785
©1988 American Physical Society