GRB111018_172743_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20111018_191201204_000002_24504701    24 stars filter C [ 6151.8s -  6331.8s] expo=180s elev=24.8deg humid= 81% sunelev=-27.0deg (moon at 161.0deg phase=0.59 elev=-15.0 )
AL_20111018_191511172_000002_24504701    23 stars filter C [ 6341.9s -  6521.9s] expo=180s elev=24.3deg humid= 81% sunelev=-27.5deg (moon at 161.0deg phase=0.59 elev=-15.0 )
AL_20111018_191821454_000002_24504701    17 stars filter R [ 6532.2s -  6712.2s] expo=180s elev=23.8deg humid= 81% sunelev=-28.1deg (moon at 161.0deg phase=0.59 elev=-14.0 )
AL_20111018_192131552_000002_24504701    21 stars filter C [ 6722.2s -  6902.2s] expo=180s elev=23.3deg humid= 81% sunelev=-28.6deg (moon at 161.0deg phase=0.59 elev=-14.0 )
AL_20111018_192441349_000002_24504701    25 stars filter C [ 6912.0s -  7092.0s] expo=180s elev=22.8deg humid= 81% sunelev=-29.2deg (moon at 161.0deg phase=0.58 elev=-13.0 )
AL_20111018_192751630_000002_24504701    16 stars filter R [ 7102.3s -  7282.3s] expo=180s elev=22.3deg humid= 81% sunelev=-29.7deg (moon at 161.0deg phase=0.58 elev=-13.0 )
AL_20111018_193201073_000002_24504801    24 stars filter C [ 7351.7s -  7531.7s] expo=180s elev=21.7deg humid= 81% sunelev=-30.5deg (moon at 161.0deg phase=0.58 elev=-13.0 )
AL_20111018_193511057_000002_24504801    23 stars filter C [ 7541.8s -  7721.8s] expo=180s elev=21.2deg humid= 81% sunelev=-31.0deg (moon at 161.0deg phase=0.58 elev=-12.0 )
AL_20111018_193821119_000002_24504801    13 stars filter R [ 7731.8s -  7911.8s] expo=180s elev=20.7deg humid= 80% sunelev=-31.5deg (moon at 161.0deg phase=0.58 elev=-12.0 )
AL_20111018_194131842_000002_24504801    23 stars filter C [ 7922.6s -  8102.6s] expo=180s elev=20.1deg humid= 80% sunelev=-32.1deg (moon at 161.0deg phase=0.58 elev=-11.0 )
AL_20111018_194442140_000002_24504801    24 stars filter C [ 8112.8s -  8292.8s] expo=180s elev=19.6deg humid= 80% sunelev=-32.6deg (moon at 161.0deg phase=0.58 elev=-11.0 )
AL_20111018_194752186_000002_24504801    15 stars filter R [ 8302.9s -  8482.9s] expo=180s elev=19.1deg humid= 81% sunelev=-33.2deg (moon at 161.0deg phase=0.58 elev=-11.0 )
AL_20111018_195154158_000002_24504901    25 stars filter C [ 8544.9s -  8724.9s] expo=180s elev=18.5deg humid= 80% sunelev=-33.9deg (moon at 161.0deg phase=0.58 elev=-10.0 )
AL_20111018_195504471_000002_24504901    23 stars filter C [ 8735.2s -  8915.2s] expo=180s elev=17.9deg humid= 81% sunelev=-34.4deg (moon at 161.0deg phase=0.58 elev=-10.0 )
AL_20111018_195814550_000002_24504901    15 stars filter R [ 8925.2s -  9105.2s] expo=180s elev=17.4deg humid= 81% sunelev=-34.9deg (moon at 161.0deg phase=0.58 elev= -9.0 )
AL_20111018_200125255_000002_24504901    23 stars filter C [ 9115.9s -  9295.9s] expo=180s elev=16.9deg humid= 81% sunelev=-35.4deg (moon at 161.0deg phase=0.58 elev= -9.0 )
AL_20111018_200435990_000002_24504901    21 stars filter C [ 9306.7s -  9486.7s] expo=180s elev=16.4deg humid= 82% sunelev=-36.0deg (moon at 161.0deg phase=0.58 elev= -9.0 )
AL_20111018_200745944_000002_24504901    14 stars filter R [ 9496.7s -  9676.7s] expo=180s elev=15.8deg humid= 82% sunelev=-36.5deg (moon at 161.0deg phase=0.58 elev= -8.0 )
AL_20111018_201204734_000002_24505001    23 stars filter C [ 9755.4s -  9935.4s] expo=180s elev=15.1deg humid= 82% sunelev=-37.2deg (moon at 161.0deg phase=0.58 elev= -7.0 )
AL_20111018_201515031_000002_24505001    16 stars filter C [ 9945.7s - 10125.7s] expo=180s elev=14.6deg humid= 82% sunelev=-37.7deg (moon at 161.0deg phase=0.58 elev= -7.0 )
AL_20111018_201825030_000002_24505001    11 stars filter R [10135.8s - 10315.8s] expo=180s elev=14.0deg humid= 81% sunelev=-38.2deg (moon at 161.0deg phase=0.58 elev= -7.0 )
AL_20111018_202134843_000002_24505001    23 stars filter C [10325.5s - 10505.5s] expo=180s elev=13.5deg humid= 81% sunelev=-38.7deg (moon at 161.0deg phase=0.58 elev= -6.0 )
AL_20111018_202444890_000002_24505001    22 stars filter C [10515.6s - 10695.6s] expo=180s elev=12.9deg humid= 81% sunelev=-39.2deg (moon at 161.0deg phase=0.58 elev= -6.0 )
AL_20111018_202755920_000002_24505001    10 stars filter R [10706.6s - 10886.6s] expo=180s elev=12.4deg humid= 81% sunelev=-39.7deg (moon at 161.0deg phase=0.58 elev= -5.0 )
AL_20111018_203158177_000002_24505101    19 stars filter C [10948.8s - 11128.8s] expo=180s elev=11.7deg humid= 81% sunelev=-40.4deg (moon at 161.0deg phase=0.58 elev= -5.0 )
AL_20111018_203508177_000002_24505101    19 stars filter C [11138.9s - 11318.9s] expo=180s elev=11.2deg humid= 81% sunelev=-40.9deg (moon at 161.0deg phase=0.58 elev= -4.0 )
AL_20111018_203818193_000002_24505101    10 stars filter R [11328.9s - 11508.9s] expo=180s elev=10.6deg humid= 82% sunelev=-41.3deg (moon at 161.0deg phase=0.58 elev= -4.0 )
AL_20111018_204128292_000002_24505101    19 stars filter C [11518.9s - 11698.9s] expo=180s elev=10.1deg humid= 82% sunelev=-41.8deg (moon at 161.0deg phase=0.58 elev= -3.0 )
AL_20111018_204438339_000002_24505101    17 stars filter C [11709.0s - 11889.0s] expo=180s elev= 9.5deg humid= 82% sunelev=-42.3deg (moon at 161.0deg phase=0.58 elev= -3.0 )
AL_20111018_204748308_000002_24505101     6 stars filter R [11899.0s - 12079.0s] expo=180s elev= 9.0deg humid= 82% sunelev=-42.8deg (moon at 161.0deg phase=0.58 elev= -2.0 )
AL_20111018_205159873_000002_24505201    13 stars filter C [12150.6s - 12330.6s] expo=180s elev= 8.2deg humid= 82% sunelev=-43.4deg (moon at 161.0deg phase=0.58 elev= -2.0 )
AL_20111018_205509904_000002_24505201    12 stars filter C [12340.6s - 12520.6s] expo=180s elev= 7.7deg humid= 82% sunelev=-43.9deg (moon at 161.0deg phase=0.58 elev= -1.0 )
AL_20111018_205819981_000002_24505201     2 stars filter R [12530.6s - 12710.6s] expo=180s elev= 7.1deg humid= 82% sunelev=-44.3deg (moon at 161.0deg phase=0.58 elev= -1.0 )
AL_20111018_210130266_000002_24505201     6 stars filter C [12720.9s - 12900.9s] expo=180s elev= 6.6deg humid= 81% sunelev=-44.8deg (moon at 161.0deg phase=0.58 elev= +0.0 )
AL_20111018_210440298_000002_24505201     8 stars filter C [12910.9s - 13090.9s] expo=180s elev= 6.0deg humid= 82% sunelev=-45.2deg (moon at 161.0deg phase=0.58 elev= +0.0 )
AL_20111018_210750095_000002_24505201     1 star  filter R [13100.8s - 13280.8s] expo=180s elev= 5.5deg humid= 82% sunelev=-45.7deg (moon at 161.0deg phase=0.58 elev= +0.0 )
AL_20111018_211201600_000002_24505301     3 stars filter C [13352.3s - 13532.3s] expo=180s elev= 4.8deg humid= 82% sunelev=-46.2deg (moon at 161.0deg phase=0.58 elev= +0.0 )
AL_20111018_211512100_000002_24505301     2 stars filter C [13542.8s - 13722.8s] expo=180s elev= 4.2deg humid= 81% sunelev=-46.7deg (moon at 161.0deg phase=0.58 elev= +1.0 )
AL_20111018_211822179_000002_24505301     1 star  filter R [13732.8s - 13912.8s] expo=180s elev= 3.7deg humid= 81% sunelev=-47.1deg (moon at 160.0deg phase=0.58 elev= +1.0 )
AL_20111018_212132168_000002_24505301     2 stars filter C [13922.9s - 14102.9s] expo=180s elev= 3.1deg humid= 81% sunelev=-47.5deg (moon at 160.0deg phase=0.58 elev= +2.0 )
AL_20111018_212442199_000002_24505301     0 star  filter C [14112.9s - 14292.9s] expo=180s elev= 2.6deg humid= 82% sunelev=-47.9deg (moon at 160.0deg phase=0.58 elev= +2.0 )
AL_20111018_212752480_000002_24505301     0 star  filter R [14303.2s - 14483.2s] expo=180s elev= 2.0deg humid= 82% sunelev=-48.3deg (moon at 160.0deg phase=0.58 elev= +3.0 )
AL_20111018_213212157_000002_24505401     0 star  filter C [14562.8s - 14742.8s] expo=180s elev= 1.3deg humid= 83% sunelev=-48.8deg (moon at 160.0deg phase=0.58 elev= +3.0 )
AL_20111018_213523156_000002_24505401     0 star  filter C [14753.8s - 14933.8s] expo=180s elev= 0.8deg humid= 84% sunelev=-49.2deg (moon at 160.0deg phase=0.58 elev= +4.0 )
AL_20111018_213833894_000002_24505401     0 star  filter R [14944.6s - 15124.6s] expo=180s elev= 0.3deg humid= 84% sunelev=-49.6deg (moon at 160.0deg phase=0.58 elev= +4.0 )
AL_20111018_214144159_000002_24505401     0 star  filter C [15134.8s - 15314.8s] expo=180s elev=-0.2deg humid= 85% sunelev=-49.9deg (moon at 160.0deg phase=0.58 elev= +5.0 )
AL_20111018_214454159_000002_24505401     0 star  filter C [15324.9s - 15504.9s] expo=180s elev=-1.3deg humid= 86% sunelev=-50.3deg (moon at 160.0deg phase=0.58 elev= +5.0 )
AL_20111018_214805113_000002_24505401     0 star  filter R [15515.8s - 15695.8s] expo=180s elev=-1.9deg humid= 86% sunelev=-50.6deg (moon at 160.0deg phase=0.58 elev= +6.0 )
Informations from GCN notice:
This is a GRB
Date of GRB : 2455853.2266725693 2011-10-18T17:26:24.509
Date of notice : 2455853.2275810186 2011-10-18T17:27:43.000
Refined position : yes (error radius=3.8 arcsec)
RA(J2000.0) : 271.464000 18h05m51s3
DEC(J2000.0) : -3.903000 -03d54m10s80
Error box : x=102:104 y=28:30 (pixels)

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=24.231125 lat=8.285726
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=2.106
Assuming Rv=3.1: Av=6.981 Ar=5.629 Ai=4.085
extmap.fit: Extinction map E(B-V) from Schlegel:

Field of View is about 59 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 111018: TAROT Calern observatory optical observations
----------------------------------------------------------------------
Klotz A. (CESR-OMP), Gendre B. (ASDC),
Boer M. (OHP-OAMP), Atteia J.L. (LATT-OMP) report:

We imaged the field of GRB 111018 detected by SWIFT
(trigger 505801) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 6151.8s after the GRB trigger
(6073.1s after the notice). The elevation of the field decreased from
24 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2011-10-18T17:26:24.287

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+6151.8s to t0+6331.8s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+6341.9s to t0+6521.9s : R > 16.2

We co-added a series of exposures:
t0+6341.9s to t0+7531.7s : 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 6151.8s 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= 24.2311 lat= +8.2857
and the galactic extinction in R band is 5.6 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.
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