Data Flow System Document Title: Document Number: Issue: Date: Document Prepared by: Document Approved by: Document Reviewed by: Document Released by: Peter Bunclark & Simon Hodgkin (CASU) Mike Irwin (CASU Manager) William Sutherland (VISTA Project Scientist) Jim Emerson (VDFS Project leader) VISTA Infra Red Camera Calibration Plan VIS-SPE-IOA-20000-0002 1.4 pre 1 2006-11-13 Signature And date: Signature And date: Signature And date: Signature And date: DATA FLOW Calibration Plan SYSTEM VISTA Document:

... Fits each source with simple (i.e., not including point-spread function) model to establish source extent and (Poisson-correct) significance (using the stand-alone python program ximgfit1 ) · Flags extended, confused and problematic sources · Computes median (or mean) background level · Excludes times of high background · Extracts spectra, postage stamp images, and light curves of each source for more detailed ... Detected X-ray sources are marked in both images. ...