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Fig. A.4.

image

Upper panel: spectrum in the energy range from 50–100 keV for a source at celestial position of SN 1987A. The spectrum is fit with a power law accounting for the emission of LMC-X1 and PSR B0540-69, which are spatially indistinguishable from SN 1987A. The green line shows the power-law continuum and the 2σ line limits. Lower panel: same as upper panel but for energy range 1090–1210 keV. We allow for a constant offset to account for possible diffuse emission sources located within the 2.7° angular resolution of SPI. We do not find significant flux excess for any of the 44Ti decay lines. The 2σ upper-limit flux determined for an expansion velocity of 3000 km s−1 is 1.8 × 10−5 ph cm−2 s−1 corresponding to 7.0 × 10−4M synthesized 44Ti (green line). Red dashed line corresponds to the IBIS flux (Grebenev et al. 2012) as it would be seen in SPI data.

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