First gamma ray burst observed by CALET Gamma ray Burst Monitor

The CALorimetric Electron Telescope (CALET) aboard the International Space Station has begun taking data. An example of a TeV electron event observed during the initial commissioning period is shown in the Japanese Space Agency press release.

The figure above is an CGBM light curve that shows two spikes peaking at T0-2s and T0+2s, and the emission ending around T0+~60s. The T90 duration measured by the CGBM data is 63 +- 5 s (30 - 1000 keV).


CALET arrives at Space Station Aug. 24

The Japanese Aerospace Exploration Agency’s (JAXA) “Kounotori” H-II Transfer Vehicle (HTV-5) arrived at the International Space Station Aug. 24 to deliver almost five tons of supplies and scientific experiments to the Expedition 44 crew. The cargo vehicle was launched atop a Japanese H-IIB rocket Aug. 19 from the Tanegashima Space Center in southern Japan.


CALET launched Wednesday Aug. 19

Mitsubishi Heavy Industries, Ltd. and the Japan Aerospace Exploration Agency launched the H-IIB Launch Vehicle No.5 (H-IIB F5) with the KOUNOTORI5 (HTV5, a cargo transfer vehicle to the International Space Station) onboard at 8:50:49 p.m. on August 19 (Wed.) 2015 (Japan Standard Time, JST) from the Tanegashima Space Center. The launch vehicle flew smoothly, and, at about 14 minutes and 54 seconds after liftoff, the separation of the KOUNOTORI5 was confirmed. We would like to express our profound appreciation for the cooperation and support of all related personnel and organizations that helped contribute to the successful launch of the H-IIB F5. At the time of the launch, the weather was fine, a wind speed was 3.5 meters/second from the south-south-east and the temperature was 27.8 degrees Celsius.

 T.Gregory Guzik on The Jim Engster Show -
  T.Gregory Guzik on The Jim Engster Show

Clips about Calet Assembly and Packaging


CALET Instrument Scheduled for Launch to Space Station

The CALorimetric Electron Telescope (CALET) instrument is scheduled for launch to the International Space Station (ISS) aboard the HTV-5 vehicle on 16 August at about 10 pm JST (8 am CST) from the Tanegashima Space Center off the southern coast of Japan. An H-IIB rocket will launch the H-II Transfer Vehicle, named Kounotori-5, which will dock with the ISS on 20- 21 August. CALET will then be transferred to the Exposed Platform attached to the Japanese Experiment Module, Kibo. There it will spend the next 2-5 years measuring very high energy cosmic ray electrons, nuclei and gamma rays. The launch and ISS rendezvous can be viewed on NASA TV, at the following website ( Prof. Cherry will represent LSU at the launch.

A Japanese led international mission, CALET involves nearly 50 researchers from Japan, Italy and the USA. LSU leads the US Science Team consisting of LSU, Washington University in St. Louis, NASA Goddard Space Flight Center and The University of Denver and will host the US CALET Data Center. John P. Wefel, LSU Professor Emeritus of Physics and Astronomy and US Co-Principal Investigator for CALET said “This mission is a tribute to the importance of international scientific research.” And added, “CALET is a great instrument and we expect to make new astrophysical discoveries with the rich dataset the mission will provide. The new insights into the workings of powerful astrophysical particle accelerators can teach us how to develop better accelerating machines here on the ground. In addition, CALET may observe a signature of the elusive dark matter.”

CALET will measure the intensity of cosmic ray electrons, protons, and nuclei accelerated to near the speed of light, and also observe high energy gamma rays. The main CALET telescope consists of an array of scintillation detectors to determine the electric charge of the incoming cosmic ray particles, an imaging calorimeter of scintillating fibers to determine the particle trajectory, and a deep lead tungstate calorimeter to measure particle and gamma ray energies up to 20 Tera-electron volts, a factor of more than three times higher than the particle beams at the largest manmade accelerator on Earth, the Large Hadron Collider in Switzerland. At such high energies, CALET may be the first experiment to observe a ‘near-by’ source of high energy radiation.

LSU scientists will operate the US CALET Data Center (USCDC) linking to Japan (and Italy), to obtain and process the flight data, distribute the results to the other US institutions, and serve as a central site for the data analysis.

Additional information on the CALET science can be found on the LSU web site at CALET is funded in the US by NASA, in Italy by the Italian Space Agency (ASI), and in Japan by the Japan Aerospace Exploration Agency (JAXA).