Abstract: The LSSTComCam commissioning observations of the Extended Chandra Deep Field South (ECDFS) included the HST CalSpec standard star C26202, which is faint enough to avoid saturation in LSSTComCam science images. This standard star was previously used for the absolute AB calibration of the Dark Energy Survey Data Release 2 (DES DR2). Two analyses were conducted using the LSSTComCam observations of C26202: (1) determination of AB magnitude offsets for the ugrizy bandpasses, and (2) measurement of the absolute system throughput for these bandpasses. AB offsets were derived by comparing calibrated LSSTComCam AB magnitudes with synthetic magnitudes. The absolute system throughput analysis involved computing expected counts for C26202 across a range of airmasses and comparing them with observed counts. Results show good agreement between measured and predicted values. This paper presents results from the final Data Preview 1 (DP1) processing.
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