1995A&A...302..133S

We present here results based on observations carried out from 1989 November 20-December-03, using one 3-mirror bank of the Gulmarg γ-ray telescope in the on-off mode. The on-source region, comprising a 4deg diameter angular-cell centered on α= 03 54 and δ=+55deg, included the direction of the pulsar PSR 0355+54, from which a significant pulsed signal, with a period of ∼156.38ms, has been reported by the Pachmarhi group. While no pulsar-related periodic modulation is found in the 1989 Gulmarg data, there is a suggestion about the presence of ∼4.1σ d.c. excess from the on-source region. Taken at its face value, this excess can be interpreted as a steady γ-ray signal with an integral flux of ~(4.5±0.8)x10^–11 photons cm^–2/s at energies beyond 4TeV. No other TeV γ-ray experiment, so far, has reported the detection of such a signal from this region. We propose here that this signal may possibly be due to a hitherto-unknown source lying in the overall on-source region.