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We report on the first open-use based Atacama Large Millimeter/submm Array(ALMA) 345-GHz observation for the late afterglow phase of GRB131030A. The ALMAobservation constrained a deep limit at 17.1 d for the afterglow and hostgalaxy. We also identified a faint submillimeter source (ALMAJ2300-0522) nearthe GRB131030A position. The deep limit at 345 GHz and multifrequencyobservations obtained using {\it Swift} and RATIR yielded forward shockmodeling with a two-dimensional relativistic hydrodynamic jet simulation anddescribed X-ray excess in the afterglow. The excess was inconsistent with thesynchrotron self-inverse Compton radiation from the forward shock. The hostgalaxy of GRB131030A and optical counterpart of ALMAJ2300-0522 were alsoidentified in the SUBARU image. Based on the deep ALMA limit for the hostgalaxy, the 3-$\sigma$ upper limits of IR luminosity and the star formationrate (SFR) is estimated as $L_{IR}<1.11\times10^{11} L_{\odot}$ and SFR$<18.7$($M_{\odot}$~yr$^{-1}$), respectively. Although the separation angle from theburst location (3.5 arcsec) was rather large, ALMAJ2300-0522 may be onecomponent of the GRB131030A host galaxy, according to previous host galaxycases.

ALMA and RATIR observations of GRB131030A