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- Fermi Queries (`astroquery.fermi`)

# Fermi Queries (`astroquery.fermi`)

## Getting started

The following example illustrates a Fermi LAT query, centered on M 31 for the energy range 1 to 100 GeV for the first day in 2013.

    >>> from astroquery.fermi import FermiLAT
    >>> result = FermiLAT.query_object('M31', energyrange_MeV='1000, 100000',
    ...                                      obsdates='2013-01-01 00:00:00, 2013-01-02 00:00:00')
    >>> print(result)
    ['https://fermi.gsfc.nasa.gov/FTP/fermi/data/lat/queries/L210111120827756AAA3A88_PH00.fits',
    'https://fermi.gsfc.nasa.gov/FTP/fermi/data/lat/queries/L210111120827756AAA3A88_SC00.fits']

## Troubleshooting

If you are repeatedly getting failed queries, or bad/out-of-date results, try clearing your cache:

    >>> from astroquery.fermi import FermiLAT
    >>> FermiLAT.clear_cache()

If this function is unavailable, upgrade your version of astroquery. The `clear_cache` function was introduced in version 0.4.7.dev8479.

## Reference/API

### astroquery.fermi Package

Access to Fermi Gamma-ray Space Telescope data.

https://fermi.gsfc.nasa.gov https://fermi.gsfc.nasa.gov/ssc/data/

#### Classes

`FermiLATClass`() | TODO: document
`GetFermilatDatafile`() | TODO: document TODO: Fail with useful failure messages on genuine failures (this doesn't need to be implemented as a class)
`Conf`() | Configuration parameters for `astroquery.fermi`.