GRB110812_054619_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20110812_195445425_000002_10994101    44 stars filter C [45893.4s - 45983.4s] expo= 90s elev=31.8deg humid= 69% sunelev=-12.5deg (moon at  35.0deg phase=0.94 elev=+18.0 )
AL_20110812_195626190_000002_10994101    37 stars filter C [45994.1s - 46084.1s] expo= 90s elev=31.9deg humid= 69% sunelev=-12.7deg (moon at  35.0deg phase=0.94 elev=+18.0 )
AL_20110812_195805986_000002_10994101    35 stars filter R [46093.9s - 46183.9s] expo= 90s elev=31.9deg humid= 68% sunelev=-13.0deg (moon at  35.0deg phase=0.94 elev=+19.0 )
AL_20110812_195946940_000002_10994101    49 stars filter C [46194.9s - 46284.9s] expo= 90s elev=32.0deg humid= 69% sunelev=-13.2deg (moon at  35.0deg phase=0.94 elev=+19.0 )
AL_20110812_200127710_000002_10994101    45 stars filter C [46295.6s - 46385.6s] expo= 90s elev=32.0deg humid= 68% sunelev=-13.5deg (moon at  35.0deg phase=0.94 elev=+19.0 )
AL_20110812_200308445_000002_10994101    35 stars filter R [46396.4s - 46486.4s] expo= 90s elev=32.0deg humid= 68% sunelev=-13.7deg (moon at  35.0deg phase=0.94 elev=+19.0 )
AL_20110812_201110137_000002_10994201     0 star  filter C [46788.1s - 46968.1s] expo=180s elev=32.2deg humid= 66% sunelev=-14.6deg (moon at  35.0deg phase=0.94 elev=+20.0 )
AL_20110812_201420607_000002_10994201     0 star  filter C [46978.6s - 47158.6s] expo=180s elev=32.2deg humid= 62% sunelev=-15.1deg (moon at  35.0deg phase=0.94 elev=+20.0 )
AL_20110812_201731137_000002_10994201    46 stars filter R [47169.1s - 47349.1s] expo=180s elev=32.2deg humid= 61% sunelev=-15.5deg (moon at  35.0deg phase=0.94 elev=+21.0 )
AL_20110812_202352160_000002_10994201     0 star  filter C [47550.1s - 47730.1s] expo=180s elev=32.3deg humid= 59% sunelev=-16.4deg (moon at  35.0deg phase=0.94 elev=+22.0 )
AL_20110812_202702895_000002_10994201    36 stars filter R [47740.8s - 47920.8s] expo=180s elev=32.3deg humid= 59% sunelev=-16.8deg (moon at  35.0deg phase=0.94 elev=+22.0 )
AL_20110812_203108836_000002_10994301     0 star  filter C [47986.8s - 48166.8s] expo=180s elev=32.3deg humid= 59% sunelev=-17.4deg (moon at  35.0deg phase=0.94 elev=+22.0 )
AL_20110812_203419601_000002_10994301     0 star  filter C [48177.5s - 48357.5s] expo=180s elev=32.3deg humid= 58% sunelev=-17.8deg (moon at  35.0deg phase=0.94 elev=+23.0 )
AL_20110812_203730086_000002_10994301    37 stars filter R [48368.0s - 48548.0s] expo=180s elev=32.2deg humid= 58% sunelev=-18.2deg (moon at  35.0deg phase=0.94 elev=+23.0 )
AL_20110812_204351328_000002_10994301     0 star  filter C [48749.3s - 48929.3s] expo=180s elev=32.1deg humid= 56% sunelev=-19.1deg (moon at  35.0deg phase=0.94 elev=+24.0 )
AL_20110812_204701874_000002_10994301    39 stars filter R [48939.8s - 49119.8s] expo=180s elev=32.1deg humid= 56% sunelev=-19.5deg (moon at  35.0deg phase=0.94 elev=+24.0 )
AL_20110812_205421536_000002_10994401     0 star  filter C [49379.5s - 49559.5s] expo=180s elev=31.9deg humid= 56% sunelev=-20.4deg (moon at  35.0deg phase=0.94 elev=+25.0 )
AL_20110812_205732253_000002_10994401    31 stars filter R [49570.2s - 49750.2s] expo=180s elev=31.9deg humid= 56% sunelev=-20.8deg (moon at  35.0deg phase=0.94 elev=+25.0 )
AL_20110812_210042801_000002_10994401     0 star  filter C [49760.8s - 49940.8s] expo=180s elev=31.8deg humid= 56% sunelev=-21.1deg (moon at  35.0deg phase=0.94 elev=+25.0 )
AL_20110812_210353525_000002_10994401     0 star  filter C [49951.5s - 50131.5s] expo=180s elev=31.7deg humid= 56% sunelev=-21.5deg (moon at  35.0deg phase=0.94 elev=+26.0 )
AL_20110812_210703822_000002_10994401    19 stars filter R [50141.8s - 50321.8s] expo=180s elev=31.5deg humid= 56% sunelev=-21.9deg (moon at  35.0deg phase=0.94 elev=+26.0 )
AL_20110812_211114186_000002_10994501     0 star  filter C [50392.1s - 50572.1s] expo=180s elev=31.4deg humid= 56% sunelev=-22.4deg (moon at  35.0deg phase=0.94 elev=+26.0 )
AL_20110812_211734936_000002_10994501    37 stars filter R [50772.9s - 50952.9s] expo=180s elev=31.1deg humid= 57% sunelev=-23.1deg (moon at  35.0deg phase=0.94 elev=+27.0 )
AL_20110812_212355505_000002_10994501     0 star  filter C [51153.5s - 51333.5s] expo=180s elev=30.8deg humid= 58% sunelev=-23.8deg (moon at  35.0deg phase=0.94 elev=+27.0 )
AL_20110812_212706239_000002_10994501    19 stars filter R [51344.2s - 51524.2s] expo=180s elev=30.7deg humid= 59% sunelev=-24.1deg (moon at  35.0deg phase=0.94 elev=+27.0 )
AL_20110812_213115431_000002_10994601     0 star  filter C [51593.4s - 51773.4s] expo=180s elev=30.4deg humid= 58% sunelev=-24.5deg (moon at  35.0deg phase=0.94 elev=+28.0 )
AL_20110812_213736931_000002_10994601    39 stars filter R [51974.9s - 52154.9s] expo=180s elev=30.1deg humid= 59% sunelev=-25.1deg (moon at  35.0deg phase=0.94 elev=+28.0 )
AL_20110812_214357938_000002_10994601     0 star  filter C [52355.9s - 52535.9s] expo=180s elev=29.6deg humid= 59% sunelev=-25.7deg (moon at  35.0deg phase=0.94 elev=+29.0 )
AL_20110812_214708405_000002_10994601    20 stars filter R [52546.4s - 52726.4s] expo=180s elev=29.4deg humid= 59% sunelev=-26.0deg (moon at  35.0deg phase=0.94 elev=+29.0 )
AL_20110812_215437208_000002_10994701     0 star  filter C [52995.2s - 53175.2s] expo=180s elev=28.9deg humid= 59% sunelev=-26.7deg (moon at  35.0deg phase=0.94 elev=+29.0 )
AL_20110812_215748145_000002_10994701    34 stars filter R [53186.1s - 53366.1s] expo=180s elev=28.6deg humid= 59% sunelev=-27.0deg (moon at  35.0deg phase=0.94 elev=+29.0 )
AL_20110812_220408962_000002_10994701     0 star  filter C [53566.9s - 53746.9s] expo=180s elev=28.1deg humid= 58% sunelev=-27.5deg (moon at  35.0deg phase=0.94 elev=+30.0 )
AL_20110812_220719415_000002_10994701    43 stars filter R [53757.4s - 53937.4s] expo=180s elev=27.9deg humid= 57% sunelev=-27.7deg (moon at  35.0deg phase=0.94 elev=+30.0 )
AL_20110812_225139334_000002_10995001     0 star  filter C [56417.3s - 56597.3s] expo=180s elev=23.5deg humid= 57% sunelev=-30.4deg (moon at  36.0deg phase=0.94 elev=+31.0 )
AL_20110812_225449568_000002_10995001     0 star  filter C [56607.5s - 56787.5s] expo=180s elev=23.1deg humid= 56% sunelev=-30.5deg (moon at  36.0deg phase=0.94 elev=+31.0 )
AL_20110812_225800099_000002_10995001    35 stars filter R [56798.0s - 56978.0s] expo=180s elev=22.7deg humid= 56% sunelev=-30.6deg (moon at  36.0deg phase=0.94 elev=+31.0 )
AL_20110812_230110806_000002_10995001     0 star  filter C [56988.8s - 57168.8s] expo=180s elev=22.4deg humid= 56% sunelev=-30.7deg (moon at  36.0deg phase=0.94 elev=+31.0 )
AL_20110812_230421087_000002_10995001     0 star  filter C [57179.1s - 57359.1s] expo=180s elev=22.0deg humid= 56% sunelev=-30.8deg (moon at  36.0deg phase=0.94 elev=+31.0 )
AL_20110812_230731854_000002_10995001    33 stars filter R [57369.8s - 57549.8s] expo=180s elev=21.6deg humid= 55% sunelev=-30.9deg (moon at  36.0deg phase=0.94 elev=+31.0 )
AL_20110812_233131152_000002_10995201     0 star  filter C [58809.1s - 58989.1s] expo=180s elev=18.5deg humid= 53% sunelev=-31.3deg (moon at  36.0deg phase=0.94 elev=+30.0 )
AL_20110812_233441714_000002_10995201     0 star  filter C [58999.6s - 59179.6s] expo=180s elev=18.1deg humid= 52% sunelev=-31.3deg (moon at  36.0deg phase=0.94 elev=+30.0 )
AL_20110812_233752167_000002_10995201    33 stars filter R [59190.1s - 59370.1s] expo=180s elev=17.7deg humid= 52% sunelev=-31.4deg (moon at  36.0deg phase=0.94 elev=+30.0 )
AL_20110812_234102905_000002_10995201     0 star  filter C [59380.9s - 59560.9s] expo=180s elev=17.2deg humid= 52% sunelev=-31.4deg (moon at  36.0deg phase=0.94 elev=+30.0 )
AL_20110812_234723719_000002_10995201    28 stars filter R [59761.7s - 59941.7s] expo=180s elev=16.4deg humid= 53% sunelev=-31.3deg (moon at  36.0deg phase=0.94 elev=+30.0 )
AL_20110813_001736799_000002_10995401     0 star  filter C [61574.8s - 61754.8s] expo=180s elev=12.0deg humid= 49% sunelev=-30.7deg (moon at  36.0deg phase=0.94 elev=+28.0 )
AL_20110813_002047299_000002_10995401    23 stars filter R [61765.3s - 61945.3s] expo=180s elev=11.5deg humid= 49% sunelev=-30.6deg (moon at  36.0deg phase=0.94 elev=+28.0 )
AL_20110813_002358037_000002_10995401    14 stars filter V [61956.0s - 62136.0s] expo=180s elev=11.0deg humid= 46% sunelev=-30.5deg (moon at  36.0deg phase=0.94 elev=+28.0 )
AL_20110813_004225156_000002_10995501     0 star  filter C [63063.1s - 63243.1s] expo=180s elev= 8.1deg humid= 48% sunelev=-29.6deg (moon at  36.0deg phase=0.95 elev=+26.0 )
AL_20110813_004535891_000002_10995501     3 stars filter R [63253.8s - 63433.8s] expo=180s elev= 7.6deg humid= 48% sunelev=-29.4deg (moon at  36.0deg phase=0.95 elev=+26.0 )
AL_20110813_004846407_000002_10995501     3 stars filter V [63444.4s - 63624.4s] expo=180s elev= 7.1deg humid= 48% sunelev=-29.2deg (moon at  36.0deg phase=0.95 elev=+26.0 )
AL_20110813_010722718_000002_10995601     0 star  filter C [64560.7s - 64740.7s] expo=180s elev= 4.1deg humid= 45% sunelev=-28.0deg (moon at  36.0deg phase=0.95 elev=+24.0 )
AL_20110813_011033217_000002_10995601     2 stars filter R [64751.2s - 64931.2s] expo=180s elev= 3.6deg humid= 46% sunelev=-27.7deg (moon at  36.0deg phase=0.95 elev=+24.0 )
AL_20110813_011343971_000002_10995601     1 star  filter V [64941.9s - 65121.9s] expo=180s elev= 3.1deg humid= 47% sunelev=-27.5deg (moon at  36.0deg phase=0.95 elev=+23.0 )
AL_20110813_013203966_000002_10995701     0 star  filter C [66041.9s - 66221.9s] expo=180s elev= 0.3deg humid= 46% sunelev=-25.9deg (moon at  37.0deg phase=0.95 elev=+21.0 )
AL_20110813_013514716_000002_10995701     0 star  filter R [66232.7s - 66412.7s] expo=180s elev=-0.2deg humid= 47% sunelev=-25.6deg (moon at  37.0deg phase=0.95 elev=+21.0 )
AL_20110813_013825217_000002_10995701     0 star  filter V [66423.2s - 66603.2s] expo=180s elev=-1.3deg humid= 46% sunelev=-25.3deg (moon at  37.0deg phase=0.95 elev=+21.0 )
Informations from GCN notice:
This is not a GRB (a retractation has been edited)
Date of GRB : 2455785.7974159722 2011-08-12T07:08:16.739
Date of notice : 2455785.8014236111 2011-08-12T07:14:03.000
Refined position : no
RA(J2000.0) : 277.363000 18h29m27s1
DEC(J2000.0) : -23.790000 -23d47m24s00
Error box : x=-3415:-3305 y=-10828:-10718 (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=16.470142 lat=1.278073
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=4.017
Assuming Rv=3.1: Av=13.318 Ar=10.739 Ai=7.794 Extinction map E(B-V) from Schlegel:

Field of View is about 55 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 110812: 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 110812 detected by SWIFT
(trigger 500108) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 45893.4s after the GRB trigger
(45547.5s after the notice). The elevation of the field increased from
31 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2011-08-12T07:08:17.088

The first image is trailed with a duration of 90.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any OT with a limiting magnitude of:
t0+45893.4s to t0+45983.4s : R > 15.1

The second image is 90.0s exposure in tracking mode:
t0+45994.1s to t0+46084.1s : R > 16.2

We co-added a series of exposures:
t0+45994.1s to t0+46968.1s : 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 45893.4s 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= 16.4701 lat= +1.2781
and the galactic extinction in R band is 10.7 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.