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The true nature of the progenitor to GRBs remains elusive; one characteristicthat would constrain our understanding of the GRB mechanism considerably isgamma-ray polarimetry measurements of the initial burst flux. We present amethod that interprets the prompt GRB flux as it Compton scatters off theEarth's atmosphere, based on detailed modelling of both the Earth's atmosphereand the orbiting detectors. The BATSE mission aboard the \textit{CGRO}monitored the whole sky in the 20 keV - 1 MeV energy band continuously fromApril 1991 until June 2000. We present the BATSE Albedo Polarimetry System(BAPS), and show that GRB 930131 and GRB 960924 provide evidence ofpolarisation in their prompt flux that is consistent with degrees ofpolarisation of $\Pi>35$% and $\Pi>50$% respectively. While the evidence ofpolarisation is strong, the method is unable to strongly constrain the degreeof polarisation beyond a systematics based estimation. Hence the implicationson GRB theory are unclear, and further measurements essential.Comment: 10 pages, 12 figures, Accepted, A&

Evidence of polarisation in the prompt gamma-ray emission from GRB 930131 and GRB 960924