GRB100418_211200_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20100418_222636190_396456_94196500    38 stars filter C [ 4402.4s -  4582.4s] expo=180s elev=24.9deg humid= 87% sunelev=-33.2deg (moon at 143.0deg phase=0.29 elev= +3.0 )
AL_20100418_222955159_396456_94196500    26 stars filter C [ 4599.5s -  4779.5s] expo=180s elev=25.5deg humid= 87% sunelev=-33.4deg (moon at 143.0deg phase=0.29 elev= +3.0 )
AL_20100418_223145534_396456_94196500     0 star  filter R [ 4799.1s -  4979.1s] expo=180s elev=26.1deg humid= 86% sunelev=-33.6deg (moon at 143.0deg phase=0.30 elev= +2.0 )
AL_20100419_004421601_396463_94197200    42 stars filter C [12666.2s - 12846.2s] expo=180s elev=47.6deg humid= 83% sunelev=-32.9deg (moon at 143.0deg phase=0.30 elev=-13.0 )
AL_20100419_004737836_396463_94197200    41 stars filter C [12863.7s - 13043.7s] expo=180s elev=48.1deg humid= 83% sunelev=-32.7deg (moon at 143.0deg phase=0.30 elev=-14.0 )
AL_20100419_005053445_396463_94197200    24 stars filter R [13059.3s - 13239.3s] expo=180s elev=48.5deg humid= 83% sunelev=-32.4deg (moon at 143.0deg phase=0.30 elev=-14.0 )
AL_20100419_005409018_396463_94197200    41 stars filter C [13254.8s - 13434.8s] expo=180s elev=48.9deg humid= 83% sunelev=-32.2deg (moon at 143.0deg phase=0.30 elev=-14.0 )
AL_20100419_005728518_396463_94197200    41 stars filter C [13454.3s - 13634.3s] expo=180s elev=49.4deg humid= 83% sunelev=-32.0deg (moon at 143.0deg phase=0.30 elev=-14.0 )
AL_20100419_010047596_396463_94197200    28 stars filter R [13651.9s - 13831.9s] expo=180s elev=49.8deg humid= 84% sunelev=-31.7deg (moon at 143.0deg phase=0.30 elev=-15.0 )
AL_20100419_010132378_396464_94197300     0 star  filter C [13851.4s - 14031.4s] expo=180s elev=50.2deg humid= 84% sunelev=-31.4deg (moon at 143.0deg phase=0.30 elev=-15.0 )
AL_20100419_015207984_396324_94183300    28 stars filter V [16733.8s - 16913.8s] expo=180s elev=55.2deg humid= 86% sunelev=-26.7deg (moon at 143.0deg phase=0.31 elev=-19.0 )
AL_20100419_015523490_396324_94183300    29 stars filter R [16929.3s - 17109.3s] expo=180s elev=55.5deg humid= 85% sunelev=-26.4deg (moon at 143.0deg phase=0.31 elev=-19.0 )
AL_20100419_015843100_396324_94183300    32 stars filter I [17128.9s - 17308.9s] expo=180s elev=55.7deg humid= 84% sunelev=-26.0deg (moon at 143.0deg phase=0.31 elev=-19.0 )
AL_20100419_021556994_396348_94185700    23 stars filter V [18160.9s - 18340.9s] expo=180s elev=56.8deg humid= 83% sunelev=-23.9deg (moon at 143.0deg phase=0.31 elev=-20.0 )
AL_20100419_021607338_396348_94185700     0 star  filter R [18358.4s - 18538.4s] expo=180s elev=57.0deg humid= 83% sunelev=-23.5deg (moon at 143.0deg phase=0.31 elev=-20.0 )
AL_20100419_030505859_396350_94185900    25 stars filter V [21111.8s - 21291.8s] expo=180s elev=57.6deg humid= 80% sunelev=-17.1deg (moon at 143.0deg phase=0.31 elev=-21.0 )
AL_20100419_030824593_396350_94185900    29 stars filter R [21309.3s - 21489.3s] expo=180s elev=57.5deg humid= 80% sunelev=-16.6deg (moon at 143.0deg phase=0.31 elev=-22.0 )
AL_20100419_031143093_396350_94185900    32 stars filter I [21508.9s - 21688.9s] expo=180s elev=57.4deg humid= 79% sunelev=-16.1deg (moon at 143.0deg phase=0.31 elev=-22.0 )
AL_20100420_213651966_396412_94192100    11 stars filter V [174217.9s - 174397.9s] expo=180s elev=17.4deg humid= 65% sunelev=-28.6deg (moon at 133.0deg phase=0.43 elev=+28.0 )
AL_20100420_214008599_396412_94192100    22 stars filter R [174413.4s - 174593.4s] expo=180s elev=18.0deg humid= 64% sunelev=-29.0deg (moon at 133.0deg phase=0.43 elev=+28.0 )
AL_20100420_214327099_396412_94192100    11 stars filter I [174612.9s - 174792.9s] expo=180s elev=18.6deg humid= 63% sunelev=-29.3deg (moon at 133.0deg phase=0.43 elev=+27.0 )
AL_20100420_224505880_396413_94192200    22 stars filter V [178311.7s - 178491.7s] expo=180s elev=29.6deg humid= 63% sunelev=-33.5deg (moon at 133.0deg phase=0.44 elev=+16.0 )
AL_20100420_224821364_396413_94192200    21 stars filter R [178507.2s - 178687.2s] expo=180s elev=30.2deg humid= 62% sunelev=-33.7deg (moon at 133.0deg phase=0.44 elev=+16.0 )
AL_20100420_225140884_396413_94192200    21 stars filter I [178706.7s - 178886.7s] expo=180s elev=30.7deg humid= 61% sunelev=-33.8deg (moon at 133.0deg phase=0.44 elev=+15.0 )
AL_20100420_235606856_396414_94192300    21 stars filter V [182572.8s - 182752.8s] expo=180s elev=41.6deg humid= 59% sunelev=-34.3deg (moon at 132.0deg phase=0.44 elev= +5.0 )
AL_20100420_235926403_396414_94192300    24 stars filter R [182772.3s - 182952.3s] expo=180s elev=42.1deg humid= 59% sunelev=-34.2deg (moon at 132.0deg phase=0.44 elev= +4.0 )
AL_20100421_000245566_396414_94192300    22 stars filter I [182969.9s - 183149.9s] expo=180s elev=42.6deg humid= 60% sunelev=-34.1deg (moon at 132.0deg phase=0.44 elev= +4.0 )
AL_20100421_010647875_396415_94192400    24 stars filter V [186813.7s - 186993.7s] expo=180s elev=51.5deg humid= 56% sunelev=-30.5deg (moon at 132.0deg phase=0.45 elev= -5.0 )
AL_20100421_011007176_396415_94192400    24 stars filter R [187011.3s - 187191.3s] expo=180s elev=51.9deg humid= 57% sunelev=-30.3deg (moon at 132.0deg phase=0.45 elev= -6.0 )
AL_20100421_011326332_396415_94192400    26 stars filter I [187210.8s - 187390.8s] expo=180s elev=52.3deg humid= 56% sunelev=-30.0deg (moon at 132.0deg phase=0.45 elev= -6.0 )
AL_20100421_021610134_396416_94192500    28 stars filter V [190976.7s - 191156.7s] expo=180s elev=57.2deg humid= 56% sunelev=-23.2deg (moon at 131.0deg phase=0.45 elev=-14.0 )
AL_20100421_021925728_396416_94192500    31 stars filter R [191171.5s - 191351.5s] expo=180s elev=57.3deg humid= 55% sunelev=-22.8deg (moon at 131.0deg phase=0.45 elev=-15.0 )
AL_20100421_022244952_396416_94192500    34 stars filter I [191369.1s - 191549.1s] expo=180s elev=57.4deg humid= 55% sunelev=-22.4deg (moon at 131.0deg phase=0.45 elev=-15.0 )
AL_20100421_205559746_396432_94194100     0 star  filter V [258165.5s - 258345.5s] expo=180s elev=10.7deg humid= 81% sunelev=-23.9deg (moon at 124.0deg phase=0.51 elev=+43.0 )
AL_20100421_205921330_396432_94194100     0 star  filter R [258365.7s - 258545.7s] expo=180s elev=11.3deg humid= 81% sunelev=-24.3deg (moon at 124.0deg phase=0.51 elev=+42.0 )
AL_20100421_210237955_396432_94194100     3 stars filter I [258562.5s - 258742.5s] expo=180s elev=11.9deg humid= 81% sunelev=-24.7deg (moon at 124.0deg phase=0.51 elev=+41.0 )
AL_20100421_220644566_396433_94194200     0 star  filter V [262410.4s - 262590.4s] expo=180s elev=23.5deg humid= 81% sunelev=-30.9deg (moon at 124.0deg phase=0.51 elev=+30.0 )
AL_20100421_221003668_396433_94194200     2 stars filter R [262608.0s - 262788.0s] expo=180s elev=24.1deg humid= 81% sunelev=-31.2deg (moon at 124.0deg phase=0.51 elev=+30.0 )
AL_20100421_221319683_396433_94194200     3 stars filter I [262805.5s - 262985.5s] expo=180s elev=24.6deg humid= 81% sunelev=-31.4deg (moon at 124.0deg phase=0.51 elev=+29.0 )
AL_20100421_231648654_396434_94194300     2 stars filter V [266613.1s - 266793.1s] expo=180s elev=35.8deg humid= 81% sunelev=-34.1deg (moon at 123.0deg phase=0.51 elev=+18.0 )
AL_20100421_232004282_396434_94194300     2 stars filter R [266808.6s - 266988.6s] expo=180s elev=36.3deg humid= 81% sunelev=-34.2deg (moon at 123.0deg phase=0.51 elev=+17.0 )
AL_20100421_232320126_396434_94194300     3 stars filter I [267004.1s - 267184.1s] expo=180s elev=36.9deg humid= 81% sunelev=-34.2deg (moon at 123.0deg phase=0.51 elev=+17.0 )
AL_20100422_002604470_396435_94194400     0 star  filter V [270769.3s - 270949.3s] expo=180s elev=46.7deg humid= 81% sunelev=-32.9deg (moon at 123.0deg phase=0.52 elev= +6.0 )
AL_20100422_002921022_396435_94194400     1 star  filter R [270966.8s - 271146.8s] expo=180s elev=47.2deg humid= 81% sunelev=-32.7deg (moon at 123.0deg phase=0.52 elev= +5.0 )
AL_20100422_003236522_396435_94194400     2 stars filter I [271162.4s - 271342.4s] expo=180s elev=47.6deg humid= 81% sunelev=-32.5deg (moon at 123.0deg phase=0.52 elev= +5.0 )
AL_20100422_024624465_396437_94194600     0 star  filter V [279188.7s - 279368.7s] expo=180s elev=57.7deg humid= 81% sunelev=-18.9deg (moon at 122.0deg phase=0.52 elev=-15.0 )
AL_20100422_024940391_396437_94194600    21 stars filter R [279386.2s - 279566.2s] expo=180s elev=57.6deg humid= 81% sunelev=-18.4deg (moon at 122.0deg phase=0.52 elev=-15.0 )
AL_20100422_025256907_396437_94194600     0 star  filter I [279581.7s - 279761.7s] expo=180s elev=57.6deg humid= 81% sunelev=-17.9deg (moon at 122.0deg phase=0.52 elev=-16.0 )
No informations from GCN notice.

Other pages about TAROT Calern observatory observations

Status of this alert received by TAROT Calern observatory.
Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=31.469318 lat=28.658692
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.072
Assuming Rv=3.1: Av=0.238 Ar=0.192 Ai=0.140 Extinction map E(B-V) from Schlegel:

Field of View is about 76 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
ROTSE last GRB images

Example of a GCNC email for this burst
GRB 100418: TAROT Calern observatory optical observations
Klotz A. (CESR-OMP), Gendre B. (IASF),
Boer M. (OHP-OAMP), Atteia J.L. (LATT-OMP) report:

We imaged the field of GRB 100418 detected by SWIFT
(trigger 419797) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 4402.4s after the GRB trigger
(XXXs after the notice). The elevation of the field increased from
24 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2010-04-18T21:10:08.040

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+4402.4s to t0+4582.4s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+4599.5s to t0+4779.5s : R > 16.2

We co-added a series of exposures:
t0+4599.5s to t0+13434.8s : 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 4402.4s 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= 31.4693 lat=+28.6587
and the galactic extinction in R band is 0.2 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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