GRB100420_052533_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20100420_232926197_397804_94544500    26 stars filter V [65016.1s - 65196.1s] expo=180s elev=35.7deg humid= 62% sunelev=-34.6deg (moon at 103.0deg phase=0.44 elev= +9.0 )
AL_20100420_233244969_397804_94544500    34 stars filter R [65215.6s - 65395.6s] expo=180s elev=36.1deg humid= 61% sunelev=-34.6deg (moon at 103.0deg phase=0.44 elev= +8.0 )
AL_20100420_233601578_397804_94544500     0 star  filter I [65413.2s - 65593.2s] expo=180s elev=36.6deg humid= 60% sunelev=-34.6deg (moon at 103.0deg phase=0.44 elev= +8.0 )
AL_20100421_003947236_397805_94544600    36 stars filter V [69238.9s - 69418.9s] expo=180s elev=44.9deg humid= 58% sunelev=-32.5deg (moon at 103.0deg phase=0.44 elev= -1.0 )
AL_20100421_004302773_397805_94544600    38 stars filter R [69434.4s - 69614.4s] expo=180s elev=45.4deg humid= 58% sunelev=-32.3deg (moon at 103.0deg phase=0.44 elev= -2.0 )
AL_20100421_004618491_397805_94544600     0 star  filter I [69629.9s - 69809.9s] expo=180s elev=45.8deg humid= 58% sunelev=-32.1deg (moon at 103.0deg phase=0.44 elev= -2.0 )
AL_20100421_015019642_397806_94544700    62 stars filter V [73470.0s - 73650.0s] expo=180s elev=54.7deg humid= 56% sunelev=-26.3deg (moon at 103.0deg phase=0.45 elev=-11.0 )
AL_20100421_015335673_397806_94544700    52 stars filter R [73665.3s - 73845.3s] expo=180s elev=55.2deg humid= 56% sunelev=-25.9deg (moon at 103.0deg phase=0.45 elev=-12.0 )
AL_20100421_015654829_397806_94544700    40 stars filter I [73865.6s - 74045.6s] expo=180s elev=55.6deg humid= 56% sunelev=-25.5deg (moon at 103.0deg phase=0.45 elev=-12.0 )
AL_20100421_030016731_397807_94544800    50 stars filter V [77668.3s - 77848.3s] expo=180s elev=64.5deg humid= 57% sunelev=-17.2deg (moon at 104.0deg phase=0.45 elev=-19.0 )
AL_20100421_030335252_397807_94544800    58 stars filter R [77865.9s - 78045.9s] expo=180s elev=64.9deg humid= 57% sunelev=-16.7deg (moon at 104.0deg phase=0.45 elev=-19.0 )
AL_20100421_030653783_397807_94544800    53 stars filter I [78065.4s - 78245.4s] expo=180s elev=65.4deg humid= 59% sunelev=-16.2deg (moon at 104.0deg phase=0.45 elev=-20.0 )
AL_20100421_202952535_397822_94546300     0 star  filter V [140643.1s - 140823.1s] expo=180s elev=17.4deg humid= 81% sunelev=-20.5deg (moon at 106.0deg phase=0.50 elev=+47.0 )
AL_20100421_214016227_397823_94546400    16 stars filter V [144867.9s - 145047.9s] expo=180s elev=23.7deg humid= 81% sunelev=-28.7deg (moon at 106.0deg phase=0.51 elev=+35.0 )
AL_20100421_214331773_397823_94546400    19 stars filter R [145063.4s - 145243.4s] expo=180s elev=24.1deg humid= 81% sunelev=-29.0deg (moon at 106.0deg phase=0.51 elev=+34.0 )
AL_20100421_214650858_397823_94546400    15 stars filter I [145260.9s - 145440.9s] expo=180s elev=24.4deg humid= 81% sunelev=-29.3deg (moon at 106.0deg phase=0.51 elev=+34.0 )
AL_20100421_224842127_397824_94546500    12 stars filter V [148973.8s - 149153.8s] expo=180s elev=31.3deg humid= 81% sunelev=-33.3deg (moon at 106.0deg phase=0.51 elev=+23.0 )
AL_20100421_225157611_397824_94546500    12 stars filter R [149169.3s - 149349.3s] expo=180s elev=31.6deg humid= 81% sunelev=-33.5deg (moon at 106.0deg phase=0.51 elev=+22.0 )
AL_20100421_225513189_397824_94546500    13 stars filter I [149365.2s - 149545.2s] expo=180s elev=32.0deg humid= 81% sunelev=-33.6deg (moon at 106.0deg phase=0.51 elev=+22.0 )
AL_20100421_235920600_397825_94546600    10 stars filter V [153210.6s - 153390.6s] expo=180s elev=40.1deg humid= 81% sunelev=-33.9deg (moon at 106.0deg phase=0.51 elev=+10.0 )
AL_20100422_000237615_397825_94546600    14 stars filter R [153408.2s - 153588.2s] expo=180s elev=40.5deg humid= 81% sunelev=-33.8deg (moon at 106.0deg phase=0.51 elev=+10.0 )
AL_20100422_000556115_397825_94546600    13 stars filter I [153607.7s - 153787.7s] expo=180s elev=40.9deg humid= 81% sunelev=-33.7deg (moon at 107.0deg phase=0.51 elev= +9.0 )
AL_20100422_010940057_397826_94546700    20 stars filter V [157431.4s - 157611.4s] expo=180s elev=49.6deg humid= 81% sunelev=-30.0deg (moon at 107.0deg phase=0.52 elev= +0.0 )
AL_20100422_011259604_397826_94546700     0 star  filter R [157630.9s - 157810.9s] expo=180s elev=50.0deg humid= 81% sunelev=-29.7deg (moon at 107.0deg phase=0.52 elev= -1.0 )
AL_20100422_011614822_397826_94546700    19 stars filter I [157826.4s - 158006.4s] expo=180s elev=50.5deg humid= 81% sunelev=-29.4deg (moon at 107.0deg phase=0.52 elev= -1.0 )
AL_20100422_022024718_397827_94546800    25 stars filter V [161676.3s - 161856.3s] expo=180s elev=59.5deg humid= 81% sunelev=-22.3deg (moon at 107.0deg phase=0.52 elev=-11.0 )
AL_20100422_022340234_397827_94546800    47 stars filter R [161871.8s - 162051.8s] expo=180s elev=59.9deg humid= 81% sunelev=-21.9deg (moon at 107.0deg phase=0.52 elev=-12.0 )
AL_20100422_022655874_397827_94546800    31 stars filter I [162067.4s - 162247.4s] expo=180s elev=60.4deg humid= 81% sunelev=-21.5deg (moon at 107.0deg phase=0.52 elev=-12.0 )
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=88.388460 lat=15.204566
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.114
Assuming Rv=3.1: Av=0.380 Ar=0.306 Ai=0.222 Extinction map E(B-V) from Schlegel:

Field of View is about 64 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 100420: 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 100420 detected by SWIFT
(trigger 419932) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 65016.1s after the GRB trigger
(XXXs after the notice). The elevation of the field increased from
35 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2010-04-20T05:22:42.270

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+65016.1s to t0+65196.1s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+65215.6s to t0+65395.6s : R > 16.2

We co-added a series of exposures:
t0+65215.6s to t0+73650.0s : 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 65016.1s 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= 88.3885 lat=+15.2046
and the galactic extinction in R band is 0.3 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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