Observing with ASTE

Updated on October 14, 2016

Dear ASTE Users,

We would like to report our recent discovery of a problem pertaining to the WHSF spectrometer data. We have found that the data acquisition from the WHSF spectrometer had a 1 second delay from the timing which is specified in the user generated observing script.  The effect is negligible for Position Switched observation mode (as the integration time is reduced by 1 second), but the effect can be seen as a shift in source position for OTF mode, and can be noticeable for fast scan patterns. The problem is currently fixed, but this problem affects all data taken using WHSF, during the period 2007 to September 27, 2016.

The correct data (with no shift) can be generated by “re-merging” the dataset with an updated program.  We have identified the projects that are affected by this problem, and we will contact the PIs of these programs individually.

We apologize for any inconvenience that this may have caused. The NAOJ Chile Observatory appreciates the community's continuous support of the ASTE operation.


Seiichi Sakamoto, Director, NAOJ Chile Observatory