GRB091208_084630_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20091208_173748340_262092_62245600    32 stars filter R [27884.0s - 28064.0s] expo=180s elev=67.1deg humid= 43% sunelev=-17.6deg (moon at 110.0deg phase=0.52 elev=-43.0 )
AL_20091208_174106185_262092_62245600    37 stars filter I [28081.0s - 28261.0s] expo=180s elev=67.2deg humid= 43% sunelev=-18.2deg (moon at 111.0deg phase=0.52 elev=-43.0 )
AL_20091209_035338078_262101_62246500    20 stars filter V [64833.0s - 65013.0s] expo=180s elev=23.3deg humid= 65% sunelev=-31.9deg (moon at 114.0deg phase=0.49 elev=+40.0 )
AL_20091209_035656328_262101_62246500    22 stars filter R [65031.0s - 65211.0s] expo=180s elev=23.1deg humid= 64% sunelev=-31.4deg (moon at 114.0deg phase=0.49 elev=+40.0 )
AL_20091209_040014734_262101_62246500    30 stars filter I [65230.0s - 65410.0s] expo=180s elev=23.0deg humid= 65% sunelev=-30.8deg (moon at 114.0deg phase=0.49 elev=+41.0 )
AL_20091209_045906642_262102_62246600    17 stars filter V [68762.0s - 68942.0s] expo=180s elev=20.7deg humid= 67% sunelev=-20.2deg (moon at 114.0deg phase=0.48 elev=+44.0 )
AL_20091209_050228665_262102_62246600    21 stars filter R [68964.0s - 69144.0s] expo=180s elev=20.6deg humid= 67% sunelev=-19.7deg (moon at 114.0deg phase=0.48 elev=+44.0 )
AL_20091209_050546853_262102_62246600    30 stars filter I [69162.0s - 69342.0s] expo=180s elev=20.6deg humid= 67% sunelev=-19.1deg (moon at 114.0deg phase=0.48 elev=+45.0 )
AL_20091209_200725562_262115_62247900    23 stars filter V [123261.0s - 123441.0s] expo=180s elev=63.6deg humid= 59% sunelev=-44.4deg (moon at 118.0deg phase=0.44 elev=-42.0 )
AL_20091209_201043749_262115_62247900    34 stars filter R [123459.0s - 123639.0s] expo=180s elev=63.4deg humid= 58% sunelev=-45.0deg (moon at 118.0deg phase=0.44 elev=-41.0 )
AL_20091209_201401952_262115_62247900    51 stars filter I [123657.0s - 123837.0s] expo=180s elev=63.1deg humid= 58% sunelev=-45.5deg (moon at 118.0deg phase=0.44 elev=-41.0 )
AL_20091210_052742946_262123_62248700     8 stars filter V [156878.0s - 157058.0s] expo=180s elev=20.0deg humid= 29% sunelev=-15.4deg (moon at 121.0deg phase=0.41 elev=+38.0 )
AL_20091210_053100977_262123_62248700    16 stars filter R [157076.0s - 157256.0s] expo=180s elev=19.9deg humid= 29% sunelev=-14.8deg (moon at 121.0deg phase=0.41 elev=+38.0 )
AL_20091210_053416180_262123_62248700    21 stars filter I [157272.0s - 157452.0s] expo=180s elev=19.9deg humid= 27% sunelev=-14.3deg (moon at 121.0deg phase=0.41 elev=+38.0 )
AL_20091211_033753070_262142_62250600     0 star  filter V [236688.0s - 236868.0s] expo=180s elev=23.7deg humid= 22% sunelev=-35.1deg (moon at 125.0deg phase=0.35 elev=+16.0 )
AL_20091211_034111289_262142_62250600     0 star  filter R [236887.0s - 237067.0s] expo=180s elev=23.5deg humid= 23% sunelev=-34.5deg (moon at 125.0deg phase=0.35 elev=+17.0 )
AL_20091212_040440816_262163_62252700    19 stars filter V [324696.0s - 324876.0s] expo=180s elev=22.2deg humid= 38% sunelev=-30.4deg (moon at 128.0deg phase=0.28 elev= +9.0 )
AL_20091212_040759238_262163_62252700    27 stars filter R [324894.0s - 325074.0s] expo=180s elev=22.1deg humid= 38% sunelev=-29.8deg (moon at 128.0deg phase=0.28 elev=+10.0 )
AL_20091212_041114019_262163_62252700    34 stars filter I [325089.0s - 325269.0s] expo=180s elev=22.0deg humid= 38% sunelev=-29.2deg (moon at 128.0deg phase=0.28 elev=+10.0 )
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=117.773615 lat=3.307284
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=1.548
Assuming Rv=3.1: Av=5.130 Ar=4.137 Ai=3.002 Extinction map E(B-V) from Schlegel:

Field of View is about 57 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 091208: 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 091208 detected by SWIFT
(trigger 378559) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 27884.0s after the GRB trigger
(XXXs after the notice). The elevation of the field increased from
67 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2009-12-08T09:49:57.990

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+27884.0s to t0+28064.0s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+28081.0s to t0+28261.0s : R > 16.2

We co-added a series of exposures:
t0+28081.0s to t0+69144.0s : 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 27884.0s 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=117.7736 lat= +3.3073
and the galactic extinction in R band is 4.1 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.