IRAC High Precision Photometry

> Frametimes longer than 2 seconds
> Correlated Noise
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Until recently data has mostly been taken with 0.1, 0.4, or 2s exposure times. As researchers push to fainter and fainter targets, observations have started to be taken with longer frame times. What happens when we do staring mode observations at longer frame times, such as 12, 30, and 100s?

One concern is that the intrapixel gain effect will get smeared out as the exposure times will be long compared with the timescales of spacecraft motion. While the IRAC team has not done a complete analysis of this, we are hearing anecdotal evidence that 12 and 30s are resonable to use with current best practices. It is unclear what the systematics will look like with 100s exposure times.

	Spitzer Documentation & Tools
Overview IRAC IRS MIPS Data Archive Data Analysis & Tools Index of Documentation Helpdesk Spitzer FAQs	IRAC High Precision Photometry > Frametimes longer than 2 seconds > Correlated Noise Home Until recently data has mostly been taken with 0.1, 0.4, or 2s exposure times. As researchers push to fainter and fainter targets, observations have started to be taken with longer frame times. What happens when we do staring mode observations at longer frame times, such as 12, 30, and 100s? One concern is that the intrapixel gain effect will get smeared out as the exposure times will be long compared with the timescales of spacecraft motion. While the IRAC team has not done a complete analysis of this, we are hearing anecdotal evidence that 12 and 30s are resonable to use with current best practices. It is unclear what the systematics will look like with 100s exposure times. IRAC HPP Home Correlated Noise ↧ ↥ Spacecraft Motion Repeatable Pointing ↧ ↥ PCRS Peak-Up Results Effective Use of PCRS Peak-Up Catalog Mapping Intrapixel Gain ↧ ↥ Centroiding Noise Pixel Optimal Aperture Size Residual Nonlinearity Staring Mode Darks Superdarks IRAC Photometric Stability Persistent Images Removing Correlated Noise Repeatability and Accuracy Measuring Noise Reduction ↧ ↥ RMS vs. Binning Scale Frametimes longer than 2 seconds Tools ↧ ↥ Contributed Software Planning Observations Data Simulator Archival Observations Data Features ↧ ↥ Updated Distortion Correction Header Keywords Skydark Change in the Middle of an Observation Background Modulation Noise Pixel Spikes Timing 58th Frame in Subarray Datasets Corrupted Header Position Jump Wheel Speed Change Pointing History File Change Effect of CR on centroiding algorithm Pattern Noise Sample Datasets Meetings ↧ ↥ IRAC IAU 2015 ↧ ↥ Poster Data Challenge