Fits to the g′r′i′z′JHKS SED of the GRB 161023A afterglow. We use the analytical expressions for the dust attenuation curves for MW (dotted blue line), LMC (dashed green line), and SMC (solid black line) dust from Pei (1992). A fit with no dust is also shown (red solid line). SMC and LMC dust both give good fits with a small amount of extinction, whereas MW dust or the complete absence of line-of-sight extinction is ruled out. The flux density is determined at the time of the light-curve break assuming n = ∞, but since this is a multi-band joint fit, scaling is essentially arbitrary (the evolution is achromatic).
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