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update v2 post
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gbrammer committed Mar 1, 2024
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2 changes: 1 addition & 1 deletion _posts/2024-03-01-nirspec-extractions-v2.md
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## Note

The `v2` spectra are affected by a bug that causes the uncertainties in the derived products to be too large by roughly a factor of $f=N^{1/4}$, where $N$ is the number of combined exposures grouped by ``source_name / detector / grating / filter / MSA plan``. For a simple set of three exposures with the 3-Shutter-Nod dither pattern, ``f = 3^{1/4} ~ 1.3``, i.e., the tabulated uncertainties are roughly 1.3× too large. The effect of the bug is larger for deeper programs; for typical UNCOVER extractions ``f = 18^{1/4} ~ 2``. For more information, see [msaexp PR#54](https://github.com/gbrammer/msaexp/pull/54).
The `v2` spectra are affected by a bug that causes the uncertainties in the derived products to be too large by roughly a factor of ``f = N^{1/4}``, where ``N`` is the number of combined exposures grouped by ``source_name / detector / grating / filter / MSA plan``. For a simple set of three exposures with the 3-Shutter-Nod dither pattern, ``f = 3^{1/4} ~ 1.3``, i.e., the tabulated uncertainties are roughly 1.3× too large. The effect of the bug is larger for deeper programs; for typical UNCOVER extractions ``f = 18^{1/4} ~ 2``. For more information, see [msaexp PR#54](https://github.com/gbrammer/msaexp/pull/54).

## Observing programs

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2 changes: 1 addition & 1 deletion assets/post_files/2024-03-01-nirspec-extractions-v2.ipynb
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"\n",
"## Note\n",
"\n",
"The `v2` spectra are affected by a bug that causes the uncertainties in the derived products to be too large by roughly a factor of $f=N^{1/4}$, where $N$ is the number of combined exposures grouped by ``source_name / detector / grating / filter / MSA plan``. For a simple set of three exposures with the 3-Shutter-Nod dither pattern, ``f = 3^{1/4} ~ 1.3``, i.e., the tabulated uncertainties are roughly 1.3× too large. The effect of the bug is larger for deeper programs; for typical UNCOVER extractions ``f = 18^{1/4} ~ 2``. For more information, see [msaexp PR#54](https://github.com/gbrammer/msaexp/pull/54)."
"The `v2` spectra are affected by a bug that causes the uncertainties in the derived products to be too large by roughly a factor of ``f = N^{1/4}``, where ``N`` is the number of combined exposures grouped by ``source_name / detector / grating / filter / MSA plan``. For a simple set of three exposures with the 3-Shutter-Nod dither pattern, ``f = 3^{1/4} ~ 1.3``, i.e., the tabulated uncertainties are roughly 1.3× too large. The effect of the bug is larger for deeper programs; for typical UNCOVER extractions ``f = 18^{1/4} ~ 2``. For more information, see [msaexp PR#54](https://github.com/gbrammer/msaexp/pull/54)."
]
},
{
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