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At high redshift, the universe was so young that core-collapse supernovae(SNe) are suspected to be the dominant source of dust production. However, someobservations indicate that the dust production by SNe is an inefficientprocess, casting doubts on the existence of abundant SNe-dust in the earlyuniverse. Recently, Perley et al. (2010) reported that the afterglow of GRB071025 - an unusually red GRB at z ~ 5 - shows evidence for the SNe-produceddust. Since this is perhaps the only high redshift GRB exhibiting compellingevidence for SNe-dust but the result could easily be affected by smallsystematics in photometry, we re-examined the extinction properties of GRB071025 using our own optical/near-infrared data at a different epoch. Inaddition, we tested SNe-dust models with different progenitor masses and dustdestruction efficiencies to constrain the dust formation mechanisms. Bysearching for the best-fit model of the afterglow spectral energy distribution,we confirm the previous claim that the dust in GRB 071025 is most likely tooriginate from SNe. We also find that the SNe-dust model of 13 or 25M_{\odot}without dust destruction fits the extinction property of GRB 071025 best, whilepair-instability SNe (PISNe) models with a 170M_{\odot} progenitor poorly fitthe data. Our results indicate that, at least in some systems at high redshift,SNe with intermediate masses within 10 - 30M_{\odot} were the main contributorsfor the dust enrichment, and the dust destruction effect due to reverse shockwas negligible.

Dust properties in afterglow of GRB 071025 at z~5