I was interested in getting all the calibration data I could—things such as flats, bias, and darks. On the cloud’s Jupyter notebook using butler, when looking for bias, I used…
butler query-datasets dp1 ‘bias’
This only displays 3 bias images for each detector. I read that around 20 bias images are taken before being created into a master bias. I am guessing that the 3 bias images I found are master bias, but I was thinking that there should be more master biases out there.
Similarly, for the flat images, there are only a few per physical detector. I was expecting to find a lot more, but was unable to do so.
Could someone please point me in the right direction or let me know if more calibration data exists?
Thank you, @Hoocory, for your questions. The post Instrument Signature Removal (postISR) inputs that went into the creation of combined biases, darks, and flats are listed in the metadata of each calibration product. You can get the metadata as shown in this DP1 tutorial: 204.1. Calibration frames — DP1
In that same tutorial, bias, dark, and flat refer to combined bias, combined dark, and combined flat, generated from multiple individual inputs (typically 20, but sometimes more).
Unfortunately, for DP1, neither the postISR inputs nor the raw individual biases, darks, and flats are available at data.lsst.cloud (only the combined certified calibrations are). However, they should be available for future data releases.
For more details on Calibration Generation, Verification, Acceptance, and Certification, and on ISR, see the following documents: