The Spitzer Space Telescope ( formerly SIRTF ) extragalactic First-Look Survey covered about 5 deg ^ { 2 } centered on J2000 \alpha = 17 ^ { h } 18 ^ { m } , \delta = 59 ^ { \circ } 30 ^ { \prime } in order to characterize the infrared sky with high sensitivity .
We used the 100-m Green Bank Telescope to image the 21 cm Galactic H I emission over a 3 \arcdeg \times 3 \arcdeg square covering this position with an effective angular resolution of 9 \farcm 8 and a velocity resolution of 0.62 km s ^ { -1 } .
In the central square degree of the image the average column density is N _ { HI } = 2.5 \times 10 ^ { 20 } cm ^ { -2 } with an rms fluctuation of 0.3 \times 10 ^ { 20 } cm ^ { -2 } .
The Galactic H I in this region has a very interesting structure .
There is a high-velocity cloud , several intermediate-velocity clouds ( one of which is probably part of the Draco nebula ) , and narrow-line low velocity filaments .
The H I emission shows a strong and detailed correlation with dust .
Except for the high-velocity cloud , all features in the N _ { HI } map have counterparts in an E ( B - V ) map derived from infrared data .
Relatively high E ( B - V ) / N _ { HI } ratios in some directions suggest the presence of molecular gas .
The best diagnostic of such regions is the peak H I line brightness temperature , not the total N _ { HI } : directions where T _ { b } > 12 K have E ( B - V ) / N _ { HI } significantly above the average value .
The data corrected for stray radiation have been released via the Web .