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"Network Construction of Optical and Infrared Synergetic Telescopes for Education and Research (OISTER)" Growing Presence of miniTAO

  • 北海道大学・ピリカ望遠鏡
  • 東京大学・木曽シュミット望遠鏡
  • 東京大学・miniTAO望遠鏡
  • 東京工業大学・MITSuME望遠鏡
  • 名古屋大学・IRSF望遠鏡
  • 国立天文台・岡山1.88m望遠鏡
  • 国立天文台・MITSuME望遠鏡
  • 広島大学・かなた望遠鏡
  • 鹿児島大学・1m望遠鏡
  • 国立天文台・石垣むりかぶし望遠鏡
  • 京都大学・40cm望遠鏡
  • ぐんま天文台・1.5m望遠鏡
  • 西はりま天文台・なゆた望遠鏡
  • 京都産業大学・荒木望遠鏡
  • 日本スペースガード・1m望遠鏡

(Please click a picture to see the larger picture with names of institutions on telescopes.)

This program, OISTER, focuses on time-domain astronomy which has been relatively unexplored and conducts follow-up observations for transient objects and continuous monitoring observations for variable objects. OISTER promotes education and researches in universities by conducting cutting-edge science which can not be achieved only with large telescopes like Subaru and ALMA and foster scientists with a broad perspective and knowledge.Human interaction over different universities are also expected.

One of the uniqueness of this program is to carry out campaign observations with several domestic and overseas telescopes.Observing targets are transient objects such as gamma-ray bursts and supernovae and binary systems with black holes and neutron stars to reveal their physical conditions by observing temporal changes of those objects.


Figure 1: Observation network of the OISTE

Table 1: Institutes, facilities, and telescopes of the OISTER

【OISTER institutes】
Institute facility telescope
Hokkaido University Nayoro Observatory 1.6m Pirka
The University of Tokyo Kiso Observatory 1.05m Kiso Schmidt
The University of Tokyo Atacama Observatory 1.04m miniTAO
Tokyo Institute of Technology Akeno Observatory 0.5m MITSuME Akeno
Nagoya University South African Astronomical Observatory 1.4m IRSF
Kyoto University Kyoto University Observatory 0.4m telescope
NAOJ Okayama Astrophysical Observatory 1.88m telescope
NAOJ Okayama Astrophysical Observatory 0.5m MITSuME
Hiroshima University Higashi Hiroshima Observatory 1.5m Kanata
Kagoshima University Iriki Observatory 1.0m
NAOJ Ishigakijima Astronomical Observatory 1.05m Murikabushi
【Cooperation Institutes】
Institute facility telescope
Gunma Prefecture Gunma Astronomical Observatory 1.5m
Kyoto Sangyo University Koyama Astronomical Observatory 1.3m Araki telescope
University of Hyogo Nishi-Harima Astronomical Observatory 2m Nayuta telescope
Japan Spaceguard Association Bisei Spaceguard Center 1.0m

The first campaign observations were conducted using 12 telescopes including ones in Chile (The University of Tokyo), South Africa (Nagoya University) from Apr. 25th to May 2nd in 2011.Thirty nine staffs, seventeen graduate students, and two undergraduate students joined this observing run.

We observed two transient objects, a Type Ia Supernova SN 2011by and a recurrent nova T Pyx (T Pyxidis) which was brightened for the first time in 45 years, and light changes of three objects, Delta Scuti variable star IP Vir (IP Virginis), and two galaxies with supermvassive black holes at their centers, 1ES1215+303 and MCG-06-30-15.Our observations with miniTAO as well as those in South African Astronomical Observatory played an important role to fill in daytime in Japan (Figure below: light change of a Delta Scuti variable star)


The second campaign observations were done from Sep. 25th to Oct. 2nd in 2011 (JST).We called for observing proposals before the observations and selected a good proposal that requests intensively observing a pulsar 1FGL233.9-0513 showing light change in a time scale of several hours.This proposal requires accurate measurement of light changes 図3:GRB111008Ain multi-band from optical to near-infrared. Good quality data obtained with miniTAO in Atacama, Chile is important because detection limit is low in Japan in near-infrared wavelength.
All the observational data are now being processed and analyzed to calculate accurate light period, determine its orbital elements, and reveal mechanism of the pulsar wind.

In this miniTAO observing run, we observed two transient objects, gamma-ray bursts GRB111005A (Oct. 5th) and GRB111008A (Oct. 8th), in near-infrared wavelength.
We set upper limits on flux of GRB111005A in J- and Ks-bands and measured flux of GRB111008A in J-, H-, and Ks-bands, and report those values in GNC Circular12420 and GCN Circular12437, respectively.

These flexible observations are one of the miniTAO features.