GLIMPSE Data & Document Release - 20050120 ===================================================================== 1. Overview ===================================================================== The GLIMPSE 20050120 data release is comprised of mosaiced images for each band and quick look 3-color (bands 1,3 and 4) jpeg files. The mosaicked images for each band are standard 32-bit IEEE floating point single-extension FITS files with Galactic coordinates. The units of the mosaic fits files are MJy/sr, with a pixel size of 0.6". GLIMPSE image processing for the mosaic image products include a column pulldown correction for bands 1 and 2 and a banding correction for band 3 and 4 data. Hot, dead, missing and saturated data pixels are masked. Caution - most outlier pixels (cosmic rays) and stray light areas are masked but not all. Muxbleed is partly corrected by the SSC pipeline. Artifacts in areas that have only single-frame coverage (outside latitudes +- 1 deg) remain in the mosaic so there are no gaps in coverage. The mosaic images are 1.1 deg x 0.8 deg (6640 x 4840 pixels) for the SURVEY region. Each file is about 128 Megabytes. There are three mosaics per one degree galactic longitude interval with 0.05 deg overlap between mosaics. For example, for the Galactic longitude of 308 deg, the centers of the three mosaics are (308.5 deg, +0.75 deg), (308.5 deg, 0.0 deg), and (308.5 deg, -0.75 deg). The longitude range is 307.95 deg to 309.05 deg for each of the three mosaics. The latitude ranges are 0.35 deg to 1.15 deg, -0.40 deg to +0.40 deg, and -1.15 deg to -0.35 deg. Filenames are GLM_lcbc_mosaic_Ich.fits, where lc and bc are the Galactic longitude and latitude of the center of the mosaic image, I denotes IRAC, and ch is the IRAC channel number. For example, GLM_30850+075_mosaic_I1.fits is a 1.1 deg x 0.8 deg IRAC channel 1 mosaic centered on l=308.50 deg, b=0.75 deg. We provide 3-color jpeg images for each 1.1 deg x 0.8 deg area, combining bands 1, 3, and 4, to be used for quick look purposes. The filename for this jpeg file is similar to the mosaic fits file: e.g. GLM_30850+075.jpg. We also provide larger 2.1 deg x 2.4 deg 3-color jpeg images to give an overall view of the area covered by the GLIMPSE survey. The filename is similar to the other jpeg images: e.g. GLM_30900+000.jpg. Note that outside latitudes of +- 1 deg we do not necessarily have full coverage in all four IRAC bands, which is noticeable in the jpeg files. Included in this delivery are 1.1 x 0.8 deg mosaics for each band and jpegs of the l=307.95 to 310.05 deg, b=+- 1.15 deg area of the GLIMPSE SURVEY region, observed in March 2004. 0.8 deg x 0.8 deg mosaic images for each band and 3-color jpegs are also provided for the Observation Strategy Validation (OSV) data taken December 23, 2003. Larger overview 3-color jpegs are provided for the OSV region and the 2.1 x 2.4 deg jpegs for the l=308-309 deg region. ===================================================================== 2. Files in the GLIMPSE 20050120 Release. ===================================================================== In this data delivery, there are 36 mosaic fits files in all, 11 jpegs. A. GLIMPSE.20050120.README - This file. B. Mosaic images of the l=307.95 to 310.05 deg, b= +-1.15 deg of the GLIMPSE SURVEY region Each mosaic fits file is about 128 MBytes. jpeg files are around 250 KBytes per file. mosaic fits file associated jpg file (ch 1,3,4) ---------------------------- ------------------------------ GLM_30850+075_mosaic_I1.fits GLM_30850+075.jpg GLM_30850+075_mosaic_I2.fits GLM_30850+075_mosaic_I3.fits GLM_30850+075_mosaic_I4.fits GLM_30850+000_mosaic_I1.fits GLM_30850+000.jpg GLM_30850+000_mosaic_I2.fits GLM_30850+000_mosaic_I3.fits GLM_30850+000_mosaic_I4.fits GLM_30850-075_mosaic_I1.fits GLM_30850-075.jpg GLM_30850-075_mosaic_I2.fits GLM_30850-075_mosaic_I3.fits GLM_30850-075_mosaic_I4.fits GLM_30950+075_mosaic_I1.fits GLM_30950+075.jpg GLM_30950+075_mosaic_I2.fits GLM_30950+075_mosaic_I3.fits GLM_30950+075_mosaic_I4.fits GLM_30950+000_mosaic_I1.fits GLM_30950+000.jpg GLM_30950+000_mosaic_I2.fits GLM_30950+000_mosaic_I3.fits GLM_30950+000_mosaic_I4.fits GLM_30950-075_mosaic_I1.fits GLM_30950-075.jpg GLM_30950-075_mosaic_I2.fits GLM_30950-075_mosaic_I3.fits GLM_30950-075_mosaic_I4.fits GLM_30900+000.jpg is a 3-color 2.1 x 2.4 deg jpeg of the entire region. C. Mosaic images and 3-color jpegs of the OSV region Each mosaic fits file is about 94 MBytes. mosaic fits file associated jpg file (ch 1,3,4) ---------------------------- ------------------------------ GLM_28420+052_mosaic_I1.fits GLM_28420+052.jpg GLM_28420+052_mosaic_I2.fits GLM_28420+052_mosaic_I3.fits GLM_28420+052_mosaic_I4.fits GLM_28420-023_mosaic_I1.fits GLM_28420-023.jpg GLM_28420-023_mosaic_I2.fits GLM_28420-023_mosaic_I3.fits GLM_28420-023_mosaic_I4.fits GLM_28420-098_mosaic_I1.fits GLM_28420-098.jpg GLM_28420-098_mosaic_I2.fits GLM_28420-098_mosaic_I3.fits GLM_28420-098_mosaic_I4.fits GLM_28420-023all.jpg is a 3-color jpeg of the entire region. D. Total size of files in the data delivery The GLM*mosaic*fits and jpeg files have been gzipped. The gzipped size totals about 3.3 Gigs. Unzipped they are about 4.1 Gigs. E. Documentation GLIMPSE Data Products Document v1.1: glimpse_dataprod_v1.1.pdf, glimpse_dataprod_v1.1.ps ===================================================================== 3. How to download the data ===================================================================== login to our anonymous ftp site ftp ftp.astro.wisc.edu cd outgoing/meade/ssc/20050120 mget * ===================================================================== 4. Miscellaneous Information ===================================================================== Note: We have two missing frames, back to back, in the band 4 data of the 309.50 -0.75 area. This gives us a half-frame gap in coverage around l=309.43, b=-0.79. We plan on re-observing this area to fill in the gap. SSC pipeline version used for the OSV data is S10.0.3, for the l308-309 data is S9.5.0.