GRB110904_043240_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20110904_191417396_000002_15685401     8 stars filter C [502290.7s - 502380.7s] expo= 90s elev=71.9deg humid= 87% sunelev=-13.0deg (moon at  74.0deg phase=0.50 elev=+17.0 )
AL_20110904_191558145_000002_15685401    10 stars filter C [502391.5s - 502481.5s] expo= 90s elev=72.2deg humid= 87% sunelev=-13.3deg (moon at  74.0deg phase=0.50 elev=+17.0 )
AL_20110904_191738677_000002_15685401     1 star  filter R [502492.0s - 502582.0s] expo= 90s elev=72.4deg humid= 87% sunelev=-13.6deg (moon at  74.0deg phase=0.50 elev=+17.0 )
AL_20110904_191919606_000002_15685401     3 stars filter C [502593.0s - 502683.0s] expo= 90s elev=72.7deg humid= 87% sunelev=-13.9deg (moon at  74.0deg phase=0.50 elev=+17.0 )
AL_20110904_192059919_000002_15685401     0 star  filter C [502693.2s - 502783.2s] expo= 90s elev=73.0deg humid= 87% sunelev=-14.1deg (moon at  74.0deg phase=0.50 elev=+17.0 )
AL_20110904_192240652_000002_15685401     0 star  filter R [502794.0s - 502884.0s] expo= 90s elev=73.3deg humid= 87% sunelev=-14.4deg (moon at  74.0deg phase=0.50 elev=+16.0 )
AL_20110904_193037953_000002_15685501     8 stars filter C [503181.3s - 503361.3s] expo=180s elev=74.5deg humid= 87% sunelev=-15.5deg (moon at  74.0deg phase=0.50 elev=+16.0 )
AL_20110904_193348921_000002_15685501    21 stars filter C [503372.3s - 503552.3s] expo=180s elev=75.0deg humid= 87% sunelev=-16.0deg (moon at  74.0deg phase=0.50 elev=+15.0 )
AL_20110904_193659890_000002_15685501    12 stars filter R [503563.2s - 503743.2s] expo=180s elev=75.5deg humid= 87% sunelev=-16.5deg (moon at  74.0deg phase=0.50 elev=+15.0 )
AL_20110904_193816531_000002_15685501     0 star  filter C [503753.7s - 503933.7s] expo=180s elev=76.0deg humid= 89% sunelev=-17.0deg (moon at  74.0deg phase=0.50 elev=+15.0 )
AL_20110904_203047966_000002_15685801    84 stars filter C [506791.3s - 506971.3s] expo=180s elev=81.4deg humid= 88% sunelev=-24.6deg (moon at  74.0deg phase=0.51 elev= +9.0 )
AL_20110904_203358262_000002_15685801    94 stars filter C [506981.6s - 507161.6s] expo=180s elev=81.5deg humid= 88% sunelev=-25.1deg (moon at  74.0deg phase=0.51 elev= +9.0 )
AL_20110904_203708293_000002_15685801    81 stars filter R [507171.7s - 507351.7s] expo=180s elev=81.5deg humid= 89% sunelev=-25.5deg (moon at  74.0deg phase=0.51 elev= +9.0 )
AL_20110904_204019269_000002_15685801    26 stars filter C [507362.6s - 507542.6s] expo=180s elev=81.5deg humid= 89% sunelev=-25.9deg (moon at  74.0deg phase=0.51 elev= +8.0 )
AL_20110904_204330222_000002_15685801    71 stars filter C [507553.6s - 507733.6s] expo=180s elev=81.4deg humid= 89% sunelev=-26.4deg (moon at  74.0deg phase=0.51 elev= +8.0 )
AL_20110904_204640769_000002_15685801    72 stars filter R [507744.1s - 507924.1s] expo=180s elev=81.3deg humid= 89% sunelev=-26.8deg (moon at  74.0deg phase=0.51 elev= +8.0 )
AL_20110904_205046508_000002_15685901    81 stars filter C [507989.8s - 508169.8s] expo=180s elev=81.2deg humid= 89% sunelev=-27.3deg (moon at  74.0deg phase=0.51 elev= +7.0 )
AL_20110904_205051587_000002_15685901     0 star  filter C [508179.1s - 508359.1s] expo=180s elev=81.0deg humid= 90% sunelev=-27.8deg (moon at  74.0deg phase=0.51 elev= +7.0 )
AL_20110905_005147936_000002_15687001    95 stars filter C [522451.3s - 522631.3s] expo=180s elev=41.4deg humid= 88% sunelev=-36.1deg (moon at  73.0deg phase=0.52 elev=-30.0 )
AL_20110905_005458249_000002_15687001    77 stars filter R [522641.6s - 522821.6s] expo=180s elev=40.9deg humid= 88% sunelev=-35.9deg (moon at  72.0deg phase=0.52 elev=-30.0 )
AL_20110905_005808734_000002_15687001    75 stars filter V [522832.1s - 523012.1s] expo=180s elev=40.3deg humid= 88% sunelev=-35.6deg (moon at  72.0deg phase=0.52 elev=-31.0 )
AL_20110905_011629947_000002_15687101    90 stars filter C [523933.3s - 524113.3s] expo=180s elev=37.1deg humid= 86% sunelev=-34.0deg (moon at  72.0deg phase=0.52 elev=-34.0 )
AL_20110905_011939985_000002_15687101    82 stars filter R [524123.3s - 524303.3s] expo=180s elev=36.6deg humid= 86% sunelev=-33.7deg (moon at  72.0deg phase=0.52 elev=-34.0 )
AL_20110905_012250955_000002_15687101    75 stars filter V [524314.3s - 524494.3s] expo=180s elev=36.0deg humid= 85% sunelev=-33.4deg (moon at  72.0deg phase=0.52 elev=-35.0 )
AL_20110905_014128118_000002_15687201    87 stars filter C [525431.5s - 525611.5s] expo=180s elev=32.8deg humid= 82% sunelev=-31.4deg (moon at  72.0deg phase=0.52 elev=-38.0 )
AL_20110905_014438367_000002_15687201    80 stars filter R [525621.7s - 525801.7s] expo=180s elev=32.3deg humid= 82% sunelev=-31.1deg (moon at  72.0deg phase=0.52 elev=-39.0 )
AL_20110905_014749101_000002_15687201    62 stars filter V [525812.5s - 525992.5s] expo=180s elev=31.7deg humid= 82% sunelev=-30.7deg (moon at  72.0deg phase=0.52 elev=-39.0 )
AL_20110905_020608770_000002_15687301    78 stars filter C [526912.1s - 527092.1s] expo=180s elev=28.6deg humid= 82% sunelev=-28.5deg (moon at  72.0deg phase=0.52 elev=-42.0 )
AL_20110905_020918775_000002_15687301    78 stars filter R [527102.1s - 527282.1s] expo=180s elev=28.1deg humid= 83% sunelev=-28.1deg (moon at  72.0deg phase=0.52 elev=-43.0 )
AL_20110905_021229774_000002_15687301    57 stars filter V [527293.1s - 527473.1s] expo=180s elev=27.6deg humid= 83% sunelev=-27.7deg (moon at  72.0deg phase=0.52 elev=-43.0 )
AL_20110905_023110324_000002_15687401    64 stars filter C [528413.7s - 528593.7s] expo=180s elev=24.5deg humid= 82% sunelev=-25.2deg (moon at  72.0deg phase=0.52 elev=-46.0 )
AL_20110905_023421308_000002_15687401    70 stars filter R [528604.6s - 528784.6s] expo=180s elev=24.0deg humid= 82% sunelev=-24.7deg (moon at  72.0deg phase=0.52 elev=-47.0 )
AL_20110905_023732276_000002_15687401    47 stars filter V [528795.6s - 528975.6s] expo=180s elev=23.5deg humid= 82% sunelev=-24.3deg (moon at  72.0deg phase=0.52 elev=-48.0 )
Informations from GCN notice:
This is a GRB
Date of GRB : 2455803.4869449073 2011-08-29T23:41:12.039
Date of notice : 2455803.4898379631 2011-08-29T23:45:22.000
Refined position : no
RA(J2000.0) : 278.721000 18h34m53s0
DEC(J2000.0) : -8.751000 -08d45m03s59
Error box : x=32707:32816 y=-61962:-61853 (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=71.331449 lat=3.079337
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=1.877
Assuming Rv=3.1: Av=6.221 Ar=5.016 Ai=3.641 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 110904: 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 110904 detected by SWIFT
(trigger 501752) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 502290.7s after the GRB trigger
(502040.4s after the notice). The elevation of the field increased from
71 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2011-08-29T23:41:11.616

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+502290.7s to t0+502380.7s : R > 15.1

The second image is 90.0s exposure in tracking mode:
t0+502391.5s to t0+502481.5s : R > 16.2

We co-added a series of exposures:
t0+502391.5s to t0+503361.3s : 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 502290.7s 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= 71.3314 lat= +3.0793
and the galactic extinction in R band is 5.0 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.