ALMA and RATIR observations of GRB 131030A

作者：Huang Kuiyun; Urata Yuji^*; Takahashi Satoko; Im Myungshin; Yu Po Chieh; Choi Changsu; Butler Nathaniel; Watson Alan M; Kutyrev Alexander; Lee William H; Klein Chris; Fox Ori D; Littlejohns Owen; Cucchiara Nino; Troja Eleonora; Gonzalez Jesus; Richer Michael G; Roman Zuniga Carlos; Bloom Josh; Prochaska J Xavier; Gehrels Neil; Moseley Harvey; Georgiev Leonid; De Diego Jose A; Ramirez Ruiz Enrico

来源：Publications of the Astronomical Society of Japan, 2017, 69(2): 20.

DOI：10.1093/pasj/psw124

• gamma-ray burst: individual (GRB 131030A)
• submillimeter: galaxies
• X-rays: bursts

We report on the first open-use based Atacama Large Millimeter/submm Array (ALMA) 345 GHz observation for the late afterglow phase of GRB 131030A. The ALMA observation constrained a deep limit at 17.1 d for the afterglow and host galaxy. We also identified a faint submillimeter source (ALMA J2300-0522) near the GRB 131030A position. The deep limit at 345 GHz and multifrequency observations obtained using Swift and RATIR yielded forward-shock modeling with a two-dimensional relativistic hydrodynamic jet simulation and described X-ray excess in the afterglow. The excess was inconsistent with the synchrotron self-inverse Compton radiation from the forward shock. The host galaxy of GRB 131030A and optical counterpart of ALMA J2300-0522 were also identified in the Subaru image. Based on the deep ALMA limit for the host galaxy, the 3 sigma upper limits of IR luminosity and the star formation rate (SFR) are estimated as L-IR < 1.11 x 10(11) L-circle dot and SFR < 18.7 (M-circle dot yr(-1)), respectively. Although the separation angle from the burst location (3.'' 5) was rather large, ALMA J2300-0522 may be one component of the GRB 131030A host galaxy, according to previous host galaxy cases.

• 出版日期2017-4
• 单位中央民族大学; 中国科学院国家天文台