GRB160821_222913_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20160821_223048147_000000_00000001     0 star  filter C [   29.6s -    89.6s] expo= 60s elev=62.5deg humid= 83% sunelev=-32.5deg (moon at  90.0deg phase=0.74 elev=+22.0 )
AL_20160821_223223537_000003_65661501    11 stars filter C [  125.0s -   185.0s] expo= 60s elev=62.3deg humid= 83% sunelev=-32.6deg (moon at  90.0deg phase=0.74 elev=+22.0 )
AL_20160821_223306131_000003_65661501     8 stars filter C [  197.6s -   227.6s] expo= 30s elev=62.2deg humid= 83% sunelev=-32.7deg (moon at  90.0deg phase=0.74 elev=+22.0 )
AL_20160821_223348490_000003_65661501     7 stars filter C [  239.9s -   269.9s] expo= 30s elev=62.1deg humid= 82% sunelev=-32.7deg (moon at  90.0deg phase=0.74 elev=+22.0 )
AL_20160821_223430881_000003_65661501    12 stars filter C [  282.3s -   312.3s] expo= 30s elev=62.0deg humid= 83% sunelev=-32.8deg (moon at  90.0deg phase=0.74 elev=+23.0 )
AL_20160821_223514397_000003_65661501    10 stars filter C [  325.8s -   355.8s] expo= 30s elev=62.0deg humid= 83% sunelev=-32.8deg (moon at  90.0deg phase=0.74 elev=+23.0 )
AL_20160821_223556761_000003_65661501    10 stars filter C [  368.2s -   398.2s] expo= 30s elev=61.9deg humid= 83% sunelev=-32.8deg (moon at  90.0deg phase=0.74 elev=+23.0 )
AL_20160821_223746120_000003_65661601    15 stars filter C [  417.6s -   507.6s] expo= 90s elev=61.7deg humid= 83% sunelev=-32.9deg (moon at  90.0deg phase=0.74 elev=+23.0 )
AL_20160821_223928495_000003_65661601    14 stars filter C [  519.9s -   609.9s] expo= 90s elev=61.6deg humid= 84% sunelev=-33.0deg (moon at  90.0deg phase=0.74 elev=+23.0 )
AL_20160821_224111323_000003_65661601    14 stars filter C [  622.8s -   712.8s] expo= 90s elev=61.4deg humid= 84% sunelev=-33.1deg (moon at  90.0deg phase=0.74 elev=+24.0 )
AL_20160821_224300198_000003_65661701    13 stars filter C [  731.6s -   821.6s] expo= 90s elev=61.2deg humid= 84% sunelev=-33.2deg (moon at  90.0deg phase=0.74 elev=+24.0 )
AL_20160821_224442792_000003_65661701    13 stars filter C [  834.2s -   924.2s] expo= 90s elev=61.0deg humid= 84% sunelev=-33.2deg (moon at  90.0deg phase=0.74 elev=+24.0 )
AL_20160821_224626099_000003_65661701    13 stars filter C [  937.5s -  1027.5s] expo= 90s elev=60.8deg humid= 85% sunelev=-33.3deg (moon at  90.0deg phase=0.74 elev=+24.0 )
AL_20160821_224815692_000003_65661801    13 stars filter C [ 1047.1s -  1137.1s] expo= 90s elev=60.6deg humid= 86% sunelev=-33.4deg (moon at  90.0deg phase=0.74 elev=+25.0 )
AL_20160821_224958036_000003_65661801    13 stars filter C [ 1149.5s -  1239.5s] expo= 90s elev=60.4deg humid= 86% sunelev=-33.5deg (moon at  90.0deg phase=0.74 elev=+25.0 )
AL_20160821_225140677_000003_65661801    12 stars filter C [ 1252.1s -  1342.1s] expo= 90s elev=60.2deg humid= 87% sunelev=-33.5deg (moon at  90.0deg phase=0.74 elev=+25.0 )
AL_20160821_225328349_000003_65661901    11 stars filter C [ 1359.8s -  1449.8s] expo= 90s elev=60.1deg humid= 88% sunelev=-33.6deg (moon at  90.0deg phase=0.74 elev=+26.0 )
AL_20160821_225511427_000003_65661901    11 stars filter C [ 1462.9s -  1552.9s] expo= 90s elev=59.9deg humid= 88% sunelev=-33.7deg (moon at  90.0deg phase=0.74 elev=+26.0 )
AL_20160821_225654492_000003_65661901    12 stars filter C [ 1565.9s -  1655.9s] expo= 90s elev=59.7deg humid= 88% sunelev=-33.7deg (moon at  90.0deg phase=0.74 elev=+26.0 )
AL_20160821_230112242_000003_65662001    14 stars filter C [ 1733.7s -  1913.7s] expo=180s elev=59.3deg humid= 88% sunelev=-33.8deg (moon at  90.0deg phase=0.73 elev=+27.0 )
AL_20160821_230424586_000003_65662001    13 stars filter C [ 1926.1s -  2106.1s] expo=180s elev=58.9deg humid= 88% sunelev=-33.9deg (moon at  90.0deg phase=0.73 elev=+27.0 )
AL_20160821_230736969_000003_65662001    10 stars filter R [ 2118.5s -  2298.5s] expo=180s elev=58.6deg humid= 87% sunelev=-34.0deg (moon at  90.0deg phase=0.73 elev=+28.0 )
AL_20160821_231100531_000000_30905501    13 stars filter C [ 2322.0s -  2502.0s] expo=180s elev=58.2deg humid= 88% sunelev=-34.1deg (moon at  90.0deg phase=0.73 elev=+28.0 )
AL_20160821_231413594_000000_30905501    12 stars filter C [ 2515.1s -  2695.1s] expo=180s elev=57.8deg humid= 88% sunelev=-34.2deg (moon at  90.0deg phase=0.73 elev=+29.0 )
AL_20160821_231726231_000000_30905501    10 stars filter R [ 2707.7s -  2887.7s] expo=180s elev=57.5deg humid= 88% sunelev=-34.3deg (moon at  90.0deg phase=0.73 elev=+29.0 )
AL_20160821_232044184_000000_30905601    14 stars filter C [ 2905.6s -  3085.6s] expo=180s elev=57.1deg humid= 88% sunelev=-34.3deg (moon at  90.0deg phase=0.73 elev=+30.0 )
AL_20160821_232356262_000000_30905601    12 stars filter C [ 3097.7s -  3277.7s] expo=180s elev=56.7deg humid= 89% sunelev=-34.4deg (moon at  90.0deg phase=0.73 elev=+30.0 )
AL_20160821_232708642_000000_30905601     8 stars filter R [ 3290.1s -  3470.1s] expo=180s elev=56.4deg humid= 89% sunelev=-34.4deg (moon at  90.0deg phase=0.73 elev=+31.0 )
AL_20160821_233027924_000000_30905701    12 stars filter C [ 3489.4s -  3669.4s] expo=180s elev=56.0deg humid= 89% sunelev=-34.4deg (moon at  90.0deg phase=0.73 elev=+31.0 )
AL_20160821_233341049_000000_30905701    14 stars filter C [ 3682.5s -  3862.5s] expo=180s elev=55.6deg humid= 89% sunelev=-34.5deg (moon at  90.0deg phase=0.73 elev=+32.0 )
AL_20160821_233653670_000000_30905701    11 stars filter R [ 3875.1s -  4055.1s] expo=180s elev=55.2deg humid= 89% sunelev=-34.5deg (moon at  90.0deg phase=0.73 elev=+32.0 )
AL_20160821_234020888_000000_30905801    12 stars filter C [ 4082.3s -  4262.3s] expo=180s elev=54.8deg humid= 89% sunelev=-34.5deg (moon at  90.0deg phase=0.73 elev=+33.0 )
AL_20160821_234333279_000000_30905801    14 stars filter C [ 4274.7s -  4454.7s] expo=180s elev=54.5deg humid= 89% sunelev=-34.4deg (moon at  90.0deg phase=0.73 elev=+33.0 )
AL_20160821_234646084_000000_30905801     7 stars filter R [ 4467.5s -  4647.5s] expo=180s elev=54.1deg humid= 89% sunelev=-34.4deg (moon at  90.0deg phase=0.73 elev=+34.0 )
AL_20160821_235004240_000000_30905901    13 stars filter C [ 4665.7s -  4845.7s] expo=180s elev=53.7deg humid= 89% sunelev=-34.4deg (moon at  90.0deg phase=0.73 elev=+34.0 )
AL_20160821_235316631_000000_30905901    12 stars filter C [ 4858.1s -  5038.1s] expo=180s elev=53.4deg humid= 89% sunelev=-34.3deg (moon at  90.0deg phase=0.73 elev=+35.0 )
AL_20160821_235629209_000000_30905901     7 stars filter R [ 5050.7s -  5230.7s] expo=180s elev=53.0deg humid= 89% sunelev=-34.3deg (moon at  90.0deg phase=0.73 elev=+35.0 )
AL_20160821_235948353_000000_30906001    13 stars filter C [ 5249.8s -  5429.8s] expo=180s elev=52.6deg humid= 90% sunelev=-34.2deg (moon at  90.0deg phase=0.73 elev=+36.0 )
AL_20160822_000301384_000000_30906001    13 stars filter C [ 5442.9s -  5622.9s] expo=180s elev=52.2deg humid= 90% sunelev=-34.2deg (moon at  90.0deg phase=0.73 elev=+36.0 )
AL_20160822_000614462_000000_30906001     8 stars filter R [ 5635.9s -  5815.9s] expo=180s elev=51.9deg humid= 89% sunelev=-34.1deg (moon at  90.0deg phase=0.73 elev=+37.0 )
AL_20160822_000932647_000000_30906101    10 stars filter C [ 5834.1s -  6014.1s] expo=180s elev=51.5deg humid= 90% sunelev=-34.0deg (moon at  90.0deg phase=0.73 elev=+37.0 )
AL_20160822_001245475_000000_30906101    12 stars filter C [ 6026.9s -  6206.9s] expo=180s elev=51.1deg humid= 90% sunelev=-33.9deg (moon at  90.0deg phase=0.73 elev=+38.0 )
AL_20160822_001558522_000000_30906101    10 stars filter R [ 6220.0s -  6400.0s] expo=180s elev=50.7deg humid= 90% sunelev=-33.8deg (moon at  90.0deg phase=0.73 elev=+38.0 )
AL_20160822_001917858_000000_30906201    12 stars filter C [ 6419.3s -  6599.3s] expo=180s elev=50.3deg humid= 90% sunelev=-33.7deg (moon at  90.0deg phase=0.73 elev=+38.0 )
AL_20160822_002230921_000000_30906201    10 stars filter C [ 6612.4s -  6792.4s] expo=180s elev=50.0deg humid= 90% sunelev=-33.5deg (moon at  90.0deg phase=0.73 elev=+39.0 )
AL_20160822_002543280_000000_30906201     8 stars filter R [ 6804.8s -  6984.8s] expo=180s elev=49.6deg humid= 91% sunelev=-33.4deg (moon at  90.0deg phase=0.73 elev=+39.0 )
AL_20160822_003833144_000000_30906401    13 stars filter C [ 7574.6s -  7754.6s] expo=180s elev=48.1deg humid= 91% sunelev=-32.7deg (moon at  90.0deg phase=0.73 elev=+41.0 )
AL_20160822_004145957_000000_30906401    12 stars filter C [ 7767.4s -  7947.4s] expo=180s elev=47.7deg humid= 90% sunelev=-32.6deg (moon at  90.0deg phase=0.73 elev=+41.0 )
AL_20160822_004500816_000000_30906401    10 stars filter R [ 7962.4s -  8142.4s] expo=180s elev=47.4deg humid= 88% sunelev=-32.4deg (moon at  90.0deg phase=0.73 elev=+42.0 )
AL_20160822_004819079_000000_30906501    13 stars filter C [ 8160.5s -  8340.5s] expo=180s elev=47.0deg humid= 86% sunelev=-32.2deg (moon at  90.0deg phase=0.73 elev=+42.0 )
AL_20160822_005131938_000000_30906501    15 stars filter C [ 8353.4s -  8533.4s] expo=180s elev=46.6deg humid= 85% sunelev=-32.0deg (moon at  90.0deg phase=0.73 elev=+42.0 )
AL_20160822_005444735_000000_30906501    11 stars filter R [ 8546.2s -  8726.2s] expo=180s elev=46.2deg humid= 84% sunelev=-31.7deg (moon at  90.0deg phase=0.73 elev=+43.0 )
AL_20160822_005803835_000000_30906601    14 stars filter C [ 8745.3s -  8925.3s] expo=180s elev=45.9deg humid= 83% sunelev=-31.5deg (moon at  90.0deg phase=0.73 elev=+43.0 )
AL_20160822_010116225_000000_30906601    14 stars filter C [ 8937.7s -  9117.7s] expo=180s elev=45.5deg humid= 84% sunelev=-31.3deg (moon at  90.0deg phase=0.73 elev=+44.0 )
AL_20160822_010429475_000000_30906601     8 stars filter R [ 9131.0s -  9311.0s] expo=180s elev=45.1deg humid= 86% sunelev=-31.0deg (moon at  90.0deg phase=0.73 elev=+44.0 )
AL_20160822_010748147_000000_30906701    14 stars filter C [ 9329.6s -  9509.6s] expo=180s elev=44.8deg humid= 87% sunelev=-30.8deg (moon at  90.0deg phase=0.73 elev=+44.0 )
AL_20160822_011101014_000000_30906701    12 stars filter C [ 9522.5s -  9702.5s] expo=180s elev=44.4deg humid= 87% sunelev=-30.5deg (moon at  90.0deg phase=0.73 elev=+45.0 )
AL_20160822_011414077_000000_30906701     8 stars filter R [ 9715.5s -  9895.5s] expo=180s elev=44.0deg humid= 87% sunelev=-30.3deg (moon at  90.0deg phase=0.73 elev=+45.0 )
AL_20160822_011732717_000000_30906801    12 stars filter C [ 9914.2s - 10094.2s] expo=180s elev=43.7deg humid= 87% sunelev=-30.0deg (moon at  90.0deg phase=0.73 elev=+45.0 )
AL_20160822_012045028_000000_30906801    14 stars filter C [10106.5s - 10286.5s] expo=180s elev=43.3deg humid= 88% sunelev=-29.7deg (moon at  90.0deg phase=0.73 elev=+45.0 )
AL_20160822_012358121_000000_30906801    11 stars filter R [10299.6s - 10479.6s] expo=180s elev=42.9deg humid= 88% sunelev=-29.4deg (moon at  90.0deg phase=0.73 elev=+46.0 )
AL_20160822_012716543_000000_30906901    14 stars filter C [10498.0s - 10678.0s] expo=180s elev=42.6deg humid= 89% sunelev=-29.1deg (moon at  90.0deg phase=0.73 elev=+46.0 )
AL_20160822_013029834_000000_30906901    14 stars filter C [10691.3s - 10871.3s] expo=180s elev=42.2deg humid= 92% sunelev=-28.8deg (moon at  90.0deg phase=0.73 elev=+46.0 )
AL_20160822_013342709_000000_30906901    12 stars filter R [10884.2s - 11064.2s] expo=180s elev=41.8deg humid= 92% sunelev=-28.5deg (moon at  90.0deg phase=0.73 elev=+47.0 )
AL_20160822_013701787_000000_30907001    13 stars filter C [11083.3s - 11263.3s] expo=180s elev=41.5deg humid= 91% sunelev=-28.2deg (moon at  90.0deg phase=0.73 elev=+47.0 )
AL_20160822_014018335_000000_30907001    13 stars filter C [11279.8s - 11459.8s] expo=180s elev=41.1deg humid= 91% sunelev=-27.8deg (moon at  90.0deg phase=0.73 elev=+47.0 )
AL_20160822_014331413_000000_30907001    11 stars filter R [11472.9s - 11652.9s] expo=180s elev=40.8deg humid= 90% sunelev=-27.5deg (moon at  90.0deg phase=0.73 elev=+47.0 )
AL_20160822_014650069_000000_30907101    11 stars filter C [11671.5s - 11851.5s] expo=180s elev=40.4deg humid= 90% sunelev=-27.2deg (moon at  90.0deg phase=0.73 elev=+47.0 )
AL_20160822_015002411_000000_30907101    16 stars filter C [11863.9s - 12043.9s] expo=180s elev=40.0deg humid= 90% sunelev=-26.8deg (moon at  90.0deg phase=0.73 elev=+48.0 )
AL_20160822_015315677_000000_30907101    12 stars filter R [12056.9s - 12236.9s] expo=180s elev=39.7deg humid= 88% sunelev=-26.5deg (moon at  90.0deg phase=0.73 elev=+48.0 )
AL_20160822_015634099_000000_30907201    13 stars filter C [12255.6s - 12435.6s] expo=180s elev=39.3deg humid= 87% sunelev=-26.1deg (moon at  90.0deg phase=0.73 elev=+48.0 )
AL_20160822_015946455_000000_30907201    13 stars filter C [12448.0s - 12628.0s] expo=180s elev=39.0deg humid= 86% sunelev=-25.7deg (moon at  90.0deg phase=0.73 elev=+48.0 )
AL_20160822_020259799_000000_30907201    12 stars filter R [12641.3s - 12821.3s] expo=180s elev=38.6deg humid= 85% sunelev=-25.4deg (moon at  90.0deg phase=0.73 elev=+48.0 )
AL_20160822_020618190_000000_30907301    12 stars filter C [12839.7s - 13019.7s] expo=180s elev=38.3deg humid= 85% sunelev=-25.0deg (moon at  90.0deg phase=0.73 elev=+49.0 )
AL_20160822_020930574_000000_30907301    14 stars filter C [13032.0s - 13212.0s] expo=180s elev=38.0deg humid= 85% sunelev=-24.6deg (moon at  90.0deg phase=0.73 elev=+49.0 )
AL_20160822_021243620_000000_30907301    10 stars filter R [13225.1s - 13405.1s] expo=180s elev=37.6deg humid= 85% sunelev=-24.2deg (moon at  90.0deg phase=0.73 elev=+49.0 )
AL_20160822_022019611_000000_30907501    13 stars filter C [13681.2s - 13861.2s] expo=180s elev=36.8deg humid= 84% sunelev=-23.3deg (moon at  90.0deg phase=0.73 elev=+49.0 )
AL_20160822_022332314_000000_30907501    12 stars filter C [13873.8s - 14053.8s] expo=180s elev=36.5deg humid= 85% sunelev=-22.9deg (moon at  90.0deg phase=0.73 elev=+49.0 )
AL_20160822_022645408_000000_30907501    11 stars filter R [14066.9s - 14246.9s] expo=180s elev=36.1deg humid= 85% sunelev=-22.4deg (moon at  90.0deg phase=0.73 elev=+49.0 )
AL_20160822_023007048_000000_30907601    12 stars filter C [14268.5s - 14448.5s] expo=180s elev=35.8deg humid= 86% sunelev=-22.0deg (moon at  90.0deg phase=0.73 elev=+49.0 )
AL_20160822_023319439_000000_30907601    12 stars filter C [14460.9s - 14640.9s] expo=180s elev=35.5deg humid= 86% sunelev=-21.6deg (moon at  90.0deg phase=0.73 elev=+49.0 )
AL_20160822_023632454_000000_30907601     8 stars filter R [14653.9s - 14833.9s] expo=180s elev=35.1deg humid= 87% sunelev=-21.2deg (moon at  90.0deg phase=0.73 elev=+49.0 )
AL_20160822_023951111_000000_30907701    12 stars filter C [14852.6s - 15032.6s] expo=180s elev=34.8deg humid= 87% sunelev=-20.7deg (moon at  90.0deg phase=0.73 elev=+49.0 )
AL_20160822_024303704_000000_30907701    12 stars filter C [15045.2s - 15225.2s] expo=180s elev=34.5deg humid= 87% sunelev=-20.3deg (moon at  90.0deg phase=0.73 elev=+50.0 )
AL_20160822_024617236_000000_30907701     7 stars filter R [15238.7s - 15418.7s] expo=180s elev=34.2deg humid= 87% sunelev=-19.8deg (moon at  90.0deg phase=0.73 elev=+50.0 )
AL_20160822_030352915_000000_30907801    13 stars filter C [16294.4s - 16474.4s] expo=180s elev=32.4deg humid= 86% sunelev=-17.4deg (moon at  90.0deg phase=0.73 elev=+49.0 )
AL_20160822_030705290_000000_30907801     8 stars filter R [16486.7s - 16666.7s] expo=180s elev=32.1deg humid= 85% sunelev=-16.9deg (moon at  90.0deg phase=0.73 elev=+49.0 )
AL_20160822_031017821_000000_30907801     6 stars filter V [16679.4s - 16859.4s] expo=180s elev=31.8deg humid= 85% sunelev=-16.4deg (moon at  90.0deg phase=0.73 elev=+49.0 )
AL_20160822_032821755_000000_30907901    12 stars filter C [17763.2s - 17943.2s] expo=180s elev=30.1deg humid= 84% sunelev=-13.7deg (moon at  90.0deg phase=0.72 elev=+49.0 )
AL_20160822_033134603_000000_30907901     8 stars filter R [17956.1s - 18136.1s] expo=180s elev=29.8deg humid= 84% sunelev=-13.2deg (moon at  90.0deg phase=0.72 elev=+48.0 )
AL_20160822_033446994_000000_30907901     6 stars filter V [18148.5s - 18328.5s] expo=180s elev=29.5deg humid= 84% sunelev=-12.7deg (moon at  90.0deg phase=0.72 elev=+48.0 )
AL_20160822_035245518_000000_30908001     0 star  filter C [19227.0s - 19407.0s] expo=180s elev=28.0deg humid= 83% sunelev=-9.9deg (moon at  90.0deg phase=0.72 elev=+47.0 )
AL_20160822_035310065_000000_30908001     0 star  filter R [19419.9s - 19599.9s] expo=180s elev=27.7deg humid= 83% sunelev=-9.3deg (moon at  90.0deg phase=0.72 elev=+47.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457622.43696 2016-08-21T22:29:13.344
Decoded useful notice informations.
RA(J2000.0) : 279.978 18h39m54s7
DEC(J2000.0) : 62.392 +62d23m31s19
Error radius : 2.2 arcsec
Error box : x=68:69 y=62:63 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=92.1862478311 lat=25.1339705064
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.046
Assuming Rv=3.1: Av=0.154 Ar=0.124 Ai=0.090
extmap.fit: Extinction map E(B-V) from Schlegel:

Field of View is about 73 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 160821: TAROT Calern observatory optical observations
----------------------------------------------------------------------
Klotz A., Turpin D. (IRAP-CNRS-OMP),
Boer M., Gendre B., Siellez K., Dereli H., Bardho O. (UNS-CNRS-OCA),
Atteia J.L. (IRAP-CNRS-OMP) report:

We imaged the field of GRB 160821 detected by SWIFT
(trigger 709357) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 29.6s after the GRB trigger
(19.2s after the notice). The elevation of the field decreased from
62 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2016-08-21T22:29:13.344

The first image is trailed with a duration of 60.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any OT with a limiting magnitude of:
t0+29.6s to t0+89.6s : R > 15.1

The second image is 60.0s exposure in tracking mode:
t0+125.0s to t0+185.0s : R > 16.2

We co-added a series of exposures:
t0+125.0s to t0+398.2s : 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 29.6s 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= 92.1862 lat=+25.1340
and the galactic extinction in R band is 0.1 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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