ALMA and RATIR observations of GRB 131030A

Kuiyun Huang, Yuji Urata, Satoko Takahashi, Myungshin Im, Po Chieh Yu, Changsu Choi, Nathaniel Butler, Alan M. Watson, Alexander Kutyrev, William H. Lee, Chris Klein, Ori D. Fox, Owen Littlejohns, Nino Cucchiara, Eleonora Troja, Jesús González, Michael G. Richer, Carlos Román-Zúñiga, Josh Bloom, J. Xavier ProchaskaNeil Gehrels, Harvey Moseley, Leonid Georgiev, José A. De Diego, Enrico Ramirez-Ruiz

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


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 3σ upper limits of IR luminosity and the star formation rate (SFR) are estimated as LIR < 1.11 × 1011 L and SFR <18.7 (M 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.

Original languageEnglish (US)
Article number20
JournalPublications of the Astronomical Society of Japan
Issue number2
StatePublished - 2017


  • Gamma-ray burst: individual (GRB 131030A)
  • Submillimeter: galaxies
  • X-rays: bursts

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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