GRB110826_083126_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20110826_191241221_000002_13953701    70 stars filter C [38487.3s - 38547.3s] expo= 60s elev=18.7deg humid= 60% sunelev=-10.0deg (moon at 142.0deg phase=0.18 elev=-23.0 )
AL_20110826_191321799_000002_13953701    54 stars filter C [38557.8s - 38587.8s] expo= 30s elev=18.7deg humid= 60% sunelev=-10.2deg (moon at 142.0deg phase=0.18 elev=-23.0 )
AL_20110826_191402581_000002_13953701    57 stars filter C [38598.6s - 38628.6s] expo= 30s elev=18.7deg humid= 60% sunelev=-10.3deg (moon at 142.0deg phase=0.18 elev=-23.0 )
AL_20110826_191443268_000002_13953701    59 stars filter C [38639.3s - 38669.3s] expo= 30s elev=18.7deg humid= 61% sunelev=-10.4deg (moon at 142.0deg phase=0.18 elev=-23.0 )
AL_20110826_191524243_000002_13953701    65 stars filter C [38680.3s - 38710.3s] expo= 30s elev=18.7deg humid= 61% sunelev=-10.5deg (moon at 142.0deg phase=0.18 elev=-23.0 )
AL_20110826_191604539_000002_13953701    57 stars filter C [38720.6s - 38750.6s] expo= 30s elev=18.7deg humid= 62% sunelev=-10.6deg (moon at 142.0deg phase=0.18 elev=-23.0 )
AL_20110826_192057415_000002_13953801    49 stars filter C [38953.5s - 39043.5s] expo= 90s elev=18.6deg humid= 63% sunelev=-11.3deg (moon at 142.0deg phase=0.18 elev=-24.0 )
AL_20110826_192238134_000002_13953801    94 stars filter C [39054.2s - 39144.2s] expo= 90s elev=18.6deg humid= 63% sunelev=-11.5deg (moon at 142.0deg phase=0.18 elev=-24.0 )
AL_20110826_192418665_000002_13953801    26 stars filter R [39154.7s - 39244.7s] expo= 90s elev=18.5deg humid= 63% sunelev=-11.8deg (moon at 142.0deg phase=0.18 elev=-24.0 )
AL_20110826_192559637_000002_13953801    90 stars filter C [39255.7s - 39345.7s] expo= 90s elev=18.5deg humid= 63% sunelev=-12.1deg (moon at 142.0deg phase=0.18 elev=-24.0 )
AL_20110826_192740388_000002_13953801    94 stars filter C [39356.4s - 39446.4s] expo= 90s elev=18.4deg humid= 64% sunelev=-12.3deg (moon at 142.0deg phase=0.18 elev=-24.0 )
AL_20110826_192920622_000002_13953801    41 stars filter R [39456.7s - 39546.7s] expo= 90s elev=18.4deg humid= 65% sunelev=-12.6deg (moon at 142.0deg phase=0.18 elev=-24.0 )
AL_20110826_193202185_000002_13953901   125 stars filter C [39618.2s - 39708.2s] expo= 90s elev=18.3deg humid= 65% sunelev=-13.0deg (moon at 142.0deg phase=0.18 elev=-25.0 )
AL_20110826_193342920_000002_13953901   137 stars filter C [39719.0s - 39809.0s] expo= 90s elev=18.3deg humid= 65% sunelev=-13.3deg (moon at 142.0deg phase=0.18 elev=-25.0 )
AL_20110826_193523676_000002_13953901    65 stars filter R [39819.7s - 39909.7s] expo= 90s elev=18.2deg humid= 67% sunelev=-13.6deg (moon at 142.0deg phase=0.18 elev=-25.0 )
AL_20110826_193704425_000002_13953901   142 stars filter C [39920.4s - 40010.4s] expo= 90s elev=18.2deg humid= 67% sunelev=-13.8deg (moon at 142.0deg phase=0.18 elev=-25.0 )
AL_20110826_193845128_000002_13953901   137 stars filter C [40021.2s - 40111.2s] expo= 90s elev=18.1deg humid= 68% sunelev=-14.1deg (moon at 142.0deg phase=0.18 elev=-25.0 )
AL_20110826_194025863_000002_13953901    70 stars filter R [40121.9s - 40211.9s] expo= 90s elev=18.0deg humid= 68% sunelev=-14.4deg (moon at 142.0deg phase=0.18 elev=-25.0 )
AL_20110826_194823431_000002_13954001     2 stars filter C [40509.4s - 40689.4s] expo=180s elev=17.8deg humid= 69% sunelev=-15.4deg (moon at 142.0deg phase=0.17 elev=-26.0 )
AL_20110826_195133415_000002_13954001     0 star  filter C [40699.5s - 40879.5s] expo=180s elev=17.6deg humid= 69% sunelev=-15.8deg (moon at 142.0deg phase=0.17 elev=-26.0 )
AL_20110826_195443728_000002_13954001     0 star  filter R [40889.7s - 41069.7s] expo=180s elev=17.5deg humid= 69% sunelev=-16.3deg (moon at 142.0deg phase=0.17 elev=-27.0 )
AL_20110826_200103826_000002_13954001     0 star  filter C [41269.8s - 41449.8s] expo=180s elev=17.2deg humid= 69% sunelev=-17.3deg (moon at 141.0deg phase=0.17 elev=-27.0 )
AL_20110826_200414295_000002_13954001     0 star  filter R [41460.3s - 41640.3s] expo=180s elev=17.0deg humid= 71% sunelev=-17.8deg (moon at 141.0deg phase=0.17 elev=-27.0 )
AL_20110826_200827239_000002_13954101     0 star  filter C [41713.3s - 41893.3s] expo=180s elev=16.8deg humid= 70% sunelev=-18.4deg (moon at 141.0deg phase=0.17 elev=-27.0 )
AL_20110826_220841229_000002_13954701     0 star  filter C [48927.3s - 49107.3s] expo=180s elev= 6.0deg humid= 86% sunelev=-32.4deg (moon at 140.0deg phase=0.17 elev=-30.0 )
AL_20110826_221151729_000002_13954701    19 stars filter C [49117.8s - 49297.8s] expo=180s elev= 5.6deg humid= 85% sunelev=-32.7deg (moon at 140.0deg phase=0.17 elev=-30.0 )
AL_20110826_221502704_000002_13954701     0 star  filter R [49308.7s - 49488.7s] expo=180s elev= 5.2deg humid= 85% sunelev=-32.9deg (moon at 140.0deg phase=0.17 elev=-30.0 )
AL_20110826_221812953_000002_13954701     0 star  filter C [49499.0s - 49679.0s] expo=180s elev= 4.8deg humid= 85% sunelev=-33.1deg (moon at 140.0deg phase=0.17 elev=-30.0 )
AL_20110826_222123937_000002_13954701    13 stars filter C [49690.0s - 49870.0s] expo=180s elev= 4.4deg humid= 85% sunelev=-33.3deg (moon at 140.0deg phase=0.16 elev=-30.0 )
AL_20110826_222434907_000002_13954701     6 stars filter R [49881.0s - 50061.0s] expo=180s elev= 4.0deg humid= 85% sunelev=-33.6deg (moon at 140.0deg phase=0.16 elev=-29.0 )
AL_20110826_222840412_000002_13954801    21 stars filter C [50126.4s - 50306.4s] expo=180s elev= 3.5deg humid= 84% sunelev=-33.8deg (moon at 140.0deg phase=0.16 elev=-29.0 )
AL_20110826_223150710_000002_13954801    19 stars filter C [50316.7s - 50496.7s] expo=180s elev= 3.1deg humid= 84% sunelev=-34.0deg (moon at 140.0deg phase=0.16 elev=-29.0 )
AL_20110826_223500730_000002_13954801     0 star  filter R [50506.8s - 50686.8s] expo=180s elev= 2.7deg humid= 84% sunelev=-34.2deg (moon at 140.0deg phase=0.16 elev=-29.0 )
AL_20110826_223811682_000002_13954801     0 star  filter C [50697.7s - 50877.7s] expo=180s elev= 2.3deg humid= 83% sunelev=-34.4deg (moon at 140.0deg phase=0.16 elev=-29.0 )
AL_20110826_224121713_000002_13954801     0 star  filter C [50887.8s - 51067.8s] expo=180s elev= 1.9deg humid= 83% sunelev=-34.5deg (moon at 139.0deg phase=0.16 elev=-29.0 )
AL_20110826_224431994_000002_13954801     0 star  filter R [51078.1s - 51258.1s] expo=180s elev= 1.5deg humid= 81% sunelev=-34.7deg (moon at 139.0deg phase=0.16 elev=-28.0 )
AL_20110826_225202176_000002_13954901     4 stars filter C [51528.2s - 51708.2s] expo=180s elev= 0.6deg humid= 78% sunelev=-35.0deg (moon at 139.0deg phase=0.16 elev=-28.0 )
AL_20110826_225822696_000002_13954901     0 star  filter C [51908.7s - 52088.7s] expo=180s elev=-0.2deg humid= 78% sunelev=-35.3deg (moon at 139.0deg phase=0.16 elev=-28.0 )
AL_20110826_230132742_000002_13954901     0 star  filter C [52098.8s - 52278.8s] expo=180s elev=-1.2deg humid= 77% sunelev=-35.4deg (moon at 139.0deg phase=0.16 elev=-27.0 )
AL_20110826_230442804_000002_13954901     0 star  filter R [52288.8s - 52468.8s] expo=180s elev=-1.7deg humid= 76% sunelev=-35.5deg (moon at 139.0deg phase=0.16 elev=-27.0 )
Informations from GCN notice:
This is not a GRB (a retractation has been edited)
Date of GRB : 2455799.8542673611 2011-08-26T08:30:08.699
Date of notice : 2455799.8551736111 2011-08-26T08:31:26.999
Refined position : no
RA(J2000.0) : 264.165000 17h36m39s5
DEC(J2000.0) : -27.375000 -27d22m30s00
Error box : x=9:118 y=9:119 (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=0.280512 lat=2.501750
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=1.360
Assuming Rv=3.1: Av=4.507 Ar=3.634 Ai=2.638 Extinction map E(B-V) from Schlegel:

Field of View is about 56 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 110826: 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 110826 detected by SWIFT
(trigger 501485) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 38487.3s after the GRB trigger
(38409.3s after the notice). The elevation of the field decreased from
18 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2011-08-26T08:30:08.928

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+38487.3s to t0+38547.3s : R > 15.1

The second image is 30.0s exposure in tracking mode:
t0+38557.8s to t0+38587.8s : R > 16.2

We co-added a series of exposures:
t0+38557.8s to t0+39043.5s : 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 38487.3s 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=  0.2805 lat= +2.5017
and the galactic extinction in R band is 3.6 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.