GRB180111_164206_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20180111_171411954_000001_04268801     0 star  filter C [ 1740.4s -  1920.4s] expo=180s elev=10.5deg humid= 83% sunelev=-10.0deg (moon at  94.0deg phase=0.33 elev=-47.0 )
AL_20180111_171722188_000001_04268801     2 stars filter C [ 1930.7s -  2110.7s] expo=180s elev=10.8deg humid= 82% sunelev=-10.6deg (moon at  94.0deg phase=0.33 elev=-48.0 )
AL_20180111_172032720_000001_04268801     2 stars filter C [ 2121.2s -  2301.2s] expo=180s elev=11.1deg humid= 83% sunelev=-11.1deg (moon at  94.0deg phase=0.33 elev=-48.0 )
AL_20180111_172402909_000001_04268901     2 stars filter C [ 2331.5s -  2511.5s] expo=180s elev=11.4deg humid= 85% sunelev=-11.7deg (moon at  94.0deg phase=0.33 elev=-49.0 )
AL_20180111_172713253_000001_04268901     2 stars filter C [ 2521.7s -  2701.7s] expo=180s elev=11.7deg humid= 84% sunelev=-12.3deg (moon at  94.0deg phase=0.33 elev=-49.0 )
AL_20180111_173023706_000001_04268901     4 stars filter C [ 2712.3s -  2892.3s] expo=180s elev=12.0deg humid= 84% sunelev=-12.8deg (moon at  94.0deg phase=0.33 elev=-50.0 )
AL_20180111_173343529_000001_04269001     3 stars filter C [ 2912.1s -  3092.1s] expo=180s elev=12.3deg humid= 84% sunelev=-13.4deg (moon at  94.0deg phase=0.33 elev=-50.0 )
AL_20180111_173653794_000001_04269001     4 stars filter C [ 3102.3s -  3282.3s] expo=180s elev=12.6deg humid= 83% sunelev=-13.9deg (moon at  95.0deg phase=0.33 elev=-50.0 )
AL_20180111_174004076_000001_04269001     5 stars filter C [ 3292.6s -  3472.6s] expo=180s elev=12.9deg humid= 84% sunelev=-14.5deg (moon at  95.0deg phase=0.32 elev=-51.0 )
AL_20180111_174323435_000003_77628401     4 stars filter C [ 3492.0s -  3672.0s] expo=180s elev=13.3deg humid= 85% sunelev=-15.0deg (moon at  95.0deg phase=0.32 elev=-51.0 )
AL_20180111_174633330_000003_77628401     4 stars filter C [ 3681.8s -  3861.8s] expo=180s elev=13.6deg humid= 85% sunelev=-15.6deg (moon at  95.0deg phase=0.32 elev=-52.0 )
AL_20180111_174943080_000003_77628401     5 stars filter C [ 3871.6s -  4051.6s] expo=180s elev=13.9deg humid= 85% sunelev=-16.1deg (moon at  95.0deg phase=0.32 elev=-52.0 )
AL_20180111_175310065_000001_04269201     4 stars filter C [ 4078.6s -  4258.6s] expo=180s elev=14.2deg humid= 84% sunelev=-16.7deg (moon at  95.0deg phase=0.32 elev=-52.0 )
AL_20180111_175620584_000001_04269201     4 stars filter C [ 4269.1s -  4449.1s] expo=180s elev=14.6deg humid= 85% sunelev=-17.3deg (moon at  95.0deg phase=0.32 elev=-53.0 )
AL_20180111_175931115_000001_04269201     6 stars filter C [ 4459.6s -  4639.6s] expo=180s elev=14.9deg humid= 84% sunelev=-17.9deg (moon at  95.0deg phase=0.32 elev=-53.0 )
AL_20180111_180256709_000003_77628601     6 stars filter C [ 4665.2s -  4845.2s] expo=180s elev=15.3deg humid= 84% sunelev=-18.5deg (moon at  95.0deg phase=0.32 elev=-54.0 )
AL_20180111_180606973_000003_77628601     6 stars filter C [ 4855.3s -  5035.3s] expo=180s elev=15.6deg humid= 83% sunelev=-19.0deg (moon at  95.0deg phase=0.32 elev=-54.0 )
AL_20180111_180917020_000003_77628601     5 stars filter C [ 5045.3s -  5225.3s] expo=180s elev=15.9deg humid= 82% sunelev=-19.6deg (moon at  95.0deg phase=0.32 elev=-54.0 )
AL_20180111_181236348_000003_77628701     4 stars filter C [ 5244.7s -  5424.7s] expo=180s elev=16.3deg humid= 80% sunelev=-20.2deg (moon at  95.0deg phase=0.32 elev=-55.0 )
AL_20180111_181546864_000003_77628701     4 stars filter C [ 5435.4s -  5615.4s] expo=180s elev=16.7deg humid= 79% sunelev=-20.7deg (moon at  95.0deg phase=0.32 elev=-55.0 )
AL_20180111_181857145_000003_77628701     5 stars filter C [ 5625.7s -  5805.7s] expo=180s elev=17.0deg humid= 79% sunelev=-21.3deg (moon at  95.0deg phase=0.32 elev=-55.0 )
AL_20180111_182226724_000003_77628801     6 stars filter C [ 5835.2s -  6015.2s] expo=180s elev=17.4deg humid= 79% sunelev=-21.9deg (moon at  95.0deg phase=0.32 elev=-56.0 )
AL_20180111_182537213_000003_77628801     6 stars filter C [ 6025.8s -  6205.8s] expo=180s elev=17.8deg humid= 79% sunelev=-22.5deg (moon at  95.0deg phase=0.32 elev=-56.0 )
AL_20180111_182847291_000003_77628801     5 stars filter C [ 6215.8s -  6395.8s] expo=180s elev=18.1deg humid= 80% sunelev=-23.0deg (moon at  95.0deg phase=0.32 elev=-56.0 )
AL_20180111_183207088_000003_77628901     3 stars filter C [ 6415.6s -  6595.6s] expo=180s elev=18.5deg humid= 78% sunelev=-23.6deg (moon at  95.0deg phase=0.32 elev=-57.0 )
AL_20180111_183516806_000003_77628901     4 stars filter C [ 6605.4s -  6785.4s] expo=180s elev=18.9deg humid= 78% sunelev=-24.2deg (moon at  95.0deg phase=0.32 elev=-57.0 )
AL_20180111_183827150_000003_77628901     6 stars filter C [ 6795.7s -  6975.7s] expo=180s elev=19.2deg humid= 75% sunelev=-24.8deg (moon at  95.0deg phase=0.32 elev=-57.0 )
AL_20180111_184152306_000001_04269701     4 stars filter C [ 7000.8s -  7180.8s] expo=180s elev=19.6deg humid= 74% sunelev=-25.4deg (moon at  95.0deg phase=0.32 elev=-57.0 )
AL_20180111_184502619_000001_04269701     6 stars filter C [ 7191.1s -  7371.1s] expo=180s elev=20.0deg humid= 75% sunelev=-26.0deg (moon at  95.0deg phase=0.32 elev=-58.0 )
AL_20180111_184813588_000001_04269701     5 stars filter C [ 7382.1s -  7562.1s] expo=180s elev=20.4deg humid= 77% sunelev=-26.5deg (moon at  95.0deg phase=0.32 elev=-58.0 )
AL_20180111_185133197_000003_77629101     4 stars filter C [ 7581.7s -  7761.7s] expo=180s elev=20.8deg humid= 75% sunelev=-27.1deg (moon at  95.0deg phase=0.32 elev=-58.0 )
AL_20180111_185442947_000003_77629101     6 stars filter C [ 7771.5s -  7951.5s] expo=180s elev=21.2deg humid= 74% sunelev=-27.7deg (moon at  95.0deg phase=0.32 elev=-58.0 )
AL_20180111_185753448_000003_77629101     4 stars filter C [ 7962.0s -  8142.0s] expo=180s elev=21.6deg humid= 75% sunelev=-28.3deg (moon at  95.0deg phase=0.32 elev=-59.0 )
AL_20180111_190118760_000001_04269901     4 stars filter C [ 8167.4s -  8347.4s] expo=180s elev=22.0deg humid= 75% sunelev=-28.9deg (moon at  95.0deg phase=0.32 elev=-59.0 )
AL_20180111_190428635_000001_04269901     4 stars filter C [ 8357.2s -  8537.2s] expo=180s elev=22.4deg humid= 73% sunelev=-29.4deg (moon at  95.0deg phase=0.32 elev=-59.0 )
AL_20180111_190739177_000001_04269901     5 stars filter C [ 8547.7s -  8727.7s] expo=180s elev=22.8deg humid= 88% sunelev=-30.0deg (moon at  95.0deg phase=0.32 elev=-59.0 )
AL_20180111_191104802_000003_77629301     4 stars filter C [ 8753.3s -  8933.3s] expo=180s elev=23.2deg humid= 71% sunelev=-30.6deg (moon at  95.0deg phase=0.32 elev=-59.0 )
AL_20180111_191415271_000003_77629301     4 stars filter C [ 8943.8s -  9123.8s] expo=180s elev=23.6deg humid= 69% sunelev=-31.2deg (moon at  95.0deg phase=0.32 elev=-59.0 )
AL_20180111_191725810_000003_77629301     5 stars filter C [ 9134.3s -  9314.3s] expo=180s elev=24.0deg humid= 69% sunelev=-31.8deg (moon at  95.0deg phase=0.32 elev=-60.0 )
AL_20180111_192045341_000001_04270101     5 stars filter C [ 9333.9s -  9513.9s] expo=180s elev=24.5deg humid= 67% sunelev=-32.4deg (moon at  95.0deg phase=0.32 elev=-60.0 )
AL_20180111_192355107_000001_04270101     5 stars filter C [ 9523.7s -  9703.7s] expo=180s elev=24.9deg humid= 66% sunelev=-33.0deg (moon at  95.0deg phase=0.32 elev=-60.0 )
AL_20180111_192705515_000001_04270101     4 stars filter C [ 9714.0s -  9894.0s] expo=180s elev=25.3deg humid= 66% sunelev=-33.5deg (moon at  95.0deg phase=0.32 elev=-60.0 )
AL_20180111_193031077_000003_77629501     6 stars filter C [ 9919.6s - 10099.6s] expo=180s elev=25.8deg humid= 66% sunelev=-34.1deg (moon at  95.0deg phase=0.32 elev=-60.0 )
AL_20180111_193342311_000003_77629501     5 stars filter C [10110.8s - 10290.8s] expo=180s elev=26.2deg humid= 66% sunelev=-34.7deg (moon at  96.0deg phase=0.32 elev=-60.0 )
AL_20180111_193652303_000003_77629501     5 stars filter C [10300.9s - 10480.9s] expo=180s elev=26.6deg humid= 66% sunelev=-35.3deg (moon at  96.0deg phase=0.32 elev=-60.0 )
AL_20180111_194011912_000001_04270301     5 stars filter C [10500.4s - 10680.4s] expo=180s elev=27.0deg humid= 65% sunelev=-35.9deg (moon at  96.0deg phase=0.32 elev=-60.0 )
AL_20180111_194321725_000001_04270301     4 stars filter C [10690.3s - 10870.3s] expo=180s elev=27.5deg humid= 65% sunelev=-36.5deg (moon at  96.0deg phase=0.32 elev=-60.0 )
AL_20180111_194632915_000001_04270301     3 stars filter C [10881.5s - 11061.5s] expo=180s elev=27.9deg humid= 65% sunelev=-37.0deg (moon at  96.0deg phase=0.32 elev=-60.0 )
AL_20180111_194958774_000001_04270401     5 stars filter C [11087.3s - 11267.3s] expo=180s elev=28.4deg humid= 62% sunelev=-37.7deg (moon at  96.0deg phase=0.32 elev=-60.0 )
AL_20180111_195309962_000001_04270401     5 stars filter C [11278.5s - 11458.5s] expo=180s elev=28.8deg humid= 60% sunelev=-38.2deg (moon at  96.0deg phase=0.32 elev=-60.0 )
AL_20180111_195620256_000001_04270401     5 stars filter C [11468.8s - 11648.8s] expo=180s elev=29.2deg humid= 58% sunelev=-38.8deg (moon at  96.0deg phase=0.32 elev=-60.0 )
AL_20180111_195945396_000001_04270501     4 stars filter C [11673.9s - 11853.9s] expo=180s elev=29.7deg humid= 58% sunelev=-39.4deg (moon at  96.0deg phase=0.32 elev=-60.0 )
AL_20180111_200255412_000001_04270501     6 stars filter C [11864.0s - 12044.0s] expo=180s elev=30.2deg humid= 58% sunelev=-40.0deg (moon at  96.0deg phase=0.32 elev=-60.0 )
AL_20180111_200605974_000001_04270501     5 stars filter C [12054.5s - 12234.5s] expo=180s elev=30.6deg humid= 58% sunelev=-40.5deg (moon at  96.0deg phase=0.32 elev=-60.0 )
AL_20180111_200925523_000001_04270601     5 stars filter C [12254.1s - 12434.1s] expo=180s elev=31.1deg humid= 54% sunelev=-41.1deg (moon at  96.0deg phase=0.32 elev=-59.0 )
AL_20180111_201235960_000001_04270601     5 stars filter C [12444.6s - 12624.6s] expo=180s elev=31.5deg humid= 56% sunelev=-41.7deg (moon at  96.0deg phase=0.32 elev=-59.0 )
AL_20180111_201545835_000001_04270601     7 stars filter C [12634.4s - 12814.4s] expo=180s elev=32.0deg humid= 56% sunelev=-42.3deg (moon at  96.0deg phase=0.32 elev=-59.0 )
AL_20180111_201912191_000003_77630001     4 stars filter C [12840.7s - 13020.7s] expo=180s elev=32.5deg humid= 55% sunelev=-42.9deg (moon at  96.0deg phase=0.32 elev=-59.0 )
AL_20180111_202222457_000003_77630001     4 stars filter C [13031.0s - 13211.0s] expo=180s elev=32.9deg humid= 56% sunelev=-43.4deg (moon at  96.0deg phase=0.32 elev=-59.0 )
AL_20180111_202534582_000003_77630001     7 stars filter C [13223.1s - 13403.1s] expo=180s elev=33.4deg humid= 58% sunelev=-44.0deg (moon at  96.0deg phase=0.32 elev=-59.0 )
AL_20180111_203319439_000001_04270901     7 stars filter C [13688.0s - 13868.0s] expo=180s elev=34.5deg humid= 59% sunelev=-45.4deg (moon at  96.0deg phase=0.32 elev=-58.0 )
AL_20180111_203629955_000001_04270901     8 stars filter C [13878.5s - 14058.5s] expo=180s elev=34.9deg humid= 59% sunelev=-45.9deg (moon at  96.0deg phase=0.32 elev=-58.0 )
AL_20180111_203940508_000001_04270901     5 stars filter C [14069.0s - 14249.0s] expo=180s elev=35.4deg humid= 60% sunelev=-46.5deg (moon at  96.0deg phase=0.31 elev=-58.0 )
AL_20180111_204308164_000003_77630301     5 stars filter C [14276.7s - 14456.7s] expo=180s elev=35.9deg humid= 58% sunelev=-47.1deg (moon at  96.0deg phase=0.31 elev=-57.0 )
AL_20180111_204618227_000003_77630301     5 stars filter C [14466.8s - 14646.8s] expo=180s elev=36.4deg humid= 58% sunelev=-47.6deg (moon at  96.0deg phase=0.31 elev=-57.0 )
AL_20180111_204928314_000003_77630301     5 stars filter C [14656.8s - 14836.8s] expo=180s elev=36.9deg humid= 58% sunelev=-48.2deg (moon at  96.0deg phase=0.31 elev=-57.0 )
AL_20180111_205253908_000003_77630401     6 stars filter C [14862.4s - 15042.4s] expo=180s elev=37.4deg humid= 58% sunelev=-48.8deg (moon at  96.0deg phase=0.31 elev=-57.0 )
AL_20180111_205604392_000003_77630401     5 stars filter C [15052.9s - 15232.9s] expo=180s elev=37.8deg humid= 55% sunelev=-49.3deg (moon at  96.0deg phase=0.31 elev=-56.0 )
AL_20180111_205914910_000003_77630401     5 stars filter C [15243.4s - 15423.4s] expo=180s elev=38.3deg humid= 56% sunelev=-49.8deg (moon at  96.0deg phase=0.31 elev=-56.0 )
AL_20180111_211655693_000001_04271201     8 stars filter C [16304.2s - 16484.2s] expo=180s elev=41.0deg humid= 54% sunelev=-52.8deg (moon at  96.0deg phase=0.31 elev=-54.0 )
AL_20180111_212005795_000001_04271201     8 stars filter C [16494.3s - 16674.3s] expo=180s elev=41.5deg humid= 53% sunelev=-53.3deg (moon at  96.0deg phase=0.31 elev=-54.0 )
AL_20180111_212316498_000001_04271201     7 stars filter C [16685.0s - 16865.0s] expo=180s elev=42.0deg humid= 54% sunelev=-53.8deg (moon at  96.0deg phase=0.31 elev=-53.0 )
AL_20180111_214124613_000001_04271301     5 stars filter C [17773.2s - 17953.2s] expo=180s elev=44.8deg humid= 52% sunelev=-56.7deg (moon at  97.0deg phase=0.31 elev=-51.0 )
AL_20180111_214435175_000001_04271301     6 stars filter C [17963.7s - 18143.7s] expo=180s elev=45.3deg humid= 52% sunelev=-57.2deg (moon at  97.0deg phase=0.31 elev=-51.0 )
AL_20180111_214744956_000001_04271301     5 stars filter C [18153.5s - 18333.5s] expo=180s elev=45.8deg humid= 52% sunelev=-57.7deg (moon at  97.0deg phase=0.31 elev=-50.0 )
AL_20180111_220549709_000003_77630701     8 stars filter C [19238.3s - 19418.3s] expo=180s elev=48.6deg humid= 54% sunelev=-60.3deg (moon at  97.0deg phase=0.31 elev=-48.0 )
AL_20180111_220859963_000003_77630701     8 stars filter C [19428.5s - 19608.5s] expo=180s elev=49.1deg humid= 53% sunelev=-60.7deg (moon at  97.0deg phase=0.31 elev=-47.0 )
AL_20180111_221210306_000003_77630701     8 stars filter C [19618.8s - 19798.8s] expo=180s elev=49.7deg humid= 53% sunelev=-61.1deg (moon at  97.0deg phase=0.31 elev=-47.0 )
AL_20180111_223017106_000003_77630801     8 stars filter C [20705.7s - 20885.7s] expo=180s elev=52.6deg humid= 54% sunelev=-63.4deg (moon at  97.0deg phase=0.31 elev=-44.0 )
AL_20180111_223327340_000003_77630801     8 stars filter C [20896.0s - 21076.0s] expo=180s elev=53.1deg humid= 54% sunelev=-63.8deg (moon at  97.0deg phase=0.31 elev=-44.0 )
AL_20180111_223637481_000003_77630801     7 stars filter C [21086.0s - 21266.0s] expo=180s elev=53.6deg humid= 54% sunelev=-64.1deg (moon at  97.0deg phase=0.31 elev=-43.0 )
AL_20180111_225449011_000003_77630901     8 stars filter C [22177.5s - 22357.5s] expo=180s elev=56.6deg humid= 52% sunelev=-65.9deg (moon at  97.0deg phase=0.31 elev=-40.0 )
AL_20180111_225759245_000003_77630901     6 stars filter C [22367.8s - 22547.8s] expo=180s elev=57.1deg humid= 53% sunelev=-66.1deg (moon at  97.0deg phase=0.31 elev=-40.0 )
AL_20180111_230109827_000003_77630901     6 stars filter C [22558.3s - 22738.3s] expo=180s elev=57.6deg humid= 52% sunelev=-66.4deg (moon at  97.0deg phase=0.31 elev=-39.0 )
AL_20180111_231919465_000003_77631001     8 stars filter C [23648.0s - 23828.0s] expo=180s elev=60.6deg humid= 65% sunelev=-67.5deg (moon at  97.0deg phase=0.31 elev=-36.0 )
AL_20180111_232229777_000003_77631001    11 stars filter C [23838.3s - 24018.3s] expo=180s elev=61.1deg humid= 52% sunelev=-67.6deg (moon at  98.0deg phase=0.31 elev=-36.0 )
AL_20180111_232540965_000003_77631001    10 stars filter C [24029.5s - 24209.5s] expo=180s elev=61.7deg humid= 51% sunelev=-67.7deg (moon at  98.0deg phase=0.31 elev=-35.0 )
AL_20180111_234347567_000003_77631101    11 stars filter C [25116.1s - 25296.1s] expo=180s elev=64.7deg humid= 55% sunelev=-68.0deg (moon at  98.0deg phase=0.30 elev=-32.0 )
AL_20180111_234657630_000003_77631101     8 stars filter C [25306.2s - 25486.2s] expo=180s elev=65.2deg humid= 54% sunelev=-68.0deg (moon at  98.0deg phase=0.30 elev=-32.0 )
AL_20180111_235007661_000003_77631101    10 stars filter C [25496.2s - 25676.2s] expo=180s elev=65.7deg humid= 52% sunelev=-67.9deg (moon at  98.0deg phase=0.30 elev=-31.0 )
AL_20180112_000812160_000003_77631201    12 stars filter C [26580.7s - 26760.7s] expo=180s elev=68.8deg humid= 55% sunelev=-67.3deg (moon at  98.0deg phase=0.30 elev=-28.0 )
AL_20180112_001122014_000003_77631201    11 stars filter C [26770.5s - 26950.5s] expo=180s elev=69.3deg humid= 54% sunelev=-67.2deg (moon at  98.0deg phase=0.30 elev=-28.0 )
AL_20180112_001432295_000003_77631201    11 stars filter C [26960.8s - 27140.8s] expo=180s elev=69.8deg humid= 52% sunelev=-67.0deg (moon at  98.0deg phase=0.30 elev=-27.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2458130.19590718 2018-01-11T16:42:06.380
Decoded useful notice informations.
RA(J2000.0) : 149.8408 09h59m21s7
DEC(J2000.0) : 48.2647 +48d15m52s92
Error radius : 3.0 arcmin

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=168.695955003 lat=50.6631588751
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.012
Assuming Rv=3.1: Av=0.039 Ar=0.031 Ai=0.023
extmap.fit: Extinction map E(B-V) from Schlegel:

Field of View is about 116 arcmin (north is NOT up !)

Bibliography (Last GCNC circulars and status of satellites)

GCN infos of this burst
GCN notice of this burst
Sloan Digital Sky Survey Observations of Gamma Ray Burst Fields
GCN info bursts
Gamma-ray burst real-time sky map
GRBlog
ROTSE last GRB images

Example of a GCNC email for this burst

gcncirc@capella.gsfc.nasa.gov
GRB 180111: TAROT Calern observatory optical observations
----------------------------------------------------------------------
Klotz A., Noysena.K., Atteia J.L. (CNRS-OMP-IRAP),
Boer, M., Eymar, L. (CNRS-ARTEMIS),
Gendre B. (UVI - Etelman Obs.) report:

We imaged the field of GRB 180111 detected by SWIFT
(trigger 804692) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 29.01min after the GRB trigger.
The elevation of the field increased from
10 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2018-01-11T16:42:06.380

The first image is trailed with a duration of 180.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any OT with a limiting magnitude of:
t0+1740.4s to t0+1920.4s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+1930.7s to t0+2110.7s : R > 16.2

We co-added a series of exposures:
t0+1930.7s to t0+3092.1s : R > 17.7
---- YES
We detect a new fading source in the error box given by SWIFT
We detected the candidate couterpart mentioned by XXX et al. (GCNC XXXX)
at the following position (+/- 3 arcsec):

RA(J2000.0) = XXh XXm XX.XXs
DEC(J2000.0) +XXd XX' XX.X"

OT was R~XX.X at 29.01min after GRB.
----

Magnitudes were estimated with the nearby USNO-B1 stars
and are not corrected for galactic dust extinction.

N.B. Galactic coordinates are lon=168.6960 lat=+50.6632
and the galactic extinction in R band is 0.0 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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