GRB091231_174614_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20100102_051201673_284652_67622700    11 stars filter V [127664.1s - 127844.1s] expo=180s elev=21.8deg humid= 32% sunelev=-19.5deg (moon at 113.0deg phase=0.89 elev=+30.0 )
AL_20100102_051520269_284652_67622700     3 stars filter R [127862.7s - 128042.7s] expo=180s elev=22.3deg humid= 34% sunelev=-19.0deg (moon at 113.0deg phase=0.89 elev=+30.0 )
AL_20100102_051835112_284652_67622700    11 stars filter I [128058.2s - 128238.2s] expo=180s elev=22.7deg humid= 33% sunelev=-18.4deg (moon at 113.0deg phase=0.89 elev=+29.0 )
AL_20100103_042819493_284672_67624700    11 stars filter V [211441.9s - 211621.9s] expo=180s elev=15.8deg humid= 68% sunelev=-27.3deg (moon at  99.0deg phase=0.81 elev=+44.0 )
AL_20100103_043137931_284672_67624700    13 stars filter R [211640.3s - 211820.3s] expo=180s elev=16.3deg humid= 68% sunelev=-26.7deg (moon at  99.0deg phase=0.81 elev=+43.0 )
AL_20100103_043456259_284672_67624700    13 stars filter I [211838.7s - 212018.7s] expo=180s elev=16.8deg humid= 69% sunelev=-26.2deg (moon at  99.0deg phase=0.81 elev=+43.0 )
AL_20100103_053855010_284673_67624800    12 stars filter V [215677.3s - 215857.3s] expo=180s elev=26.0deg humid= 74% sunelev=-14.9deg (moon at  98.0deg phase=0.81 elev=+32.0 )
AL_20100103_054210947_284673_67624800    16 stars filter R [215873.3s - 216053.3s] expo=180s elev=26.4deg humid= 74% sunelev=-14.3deg (moon at  98.0deg phase=0.81 elev=+31.0 )
AL_20100103_054525853_284673_67624800    14 stars filter I [216068.3s - 216248.3s] expo=180s elev=26.8deg humid= 74% sunelev=-13.8deg (moon at  98.0deg phase=0.81 elev=+31.0 )
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=357.706169 lat=35.604375
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.132
Assuming Rv=3.1: Av=0.439 Ar=0.354 Ai=0.257 Extinction map E(B-V) from Schlegel:

Field of View is about 85 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 091231: 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 091231 detected by SWIFT
(trigger 381591) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 127664.1s after the GRB trigger
(XXXs after the notice). The elevation of the field increased from
21 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2009-12-31T17:44:17.450

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+127664.1s to t0+127844.1s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+127862.7s to t0+128042.7s : R > 16.2

We co-added a series of exposures:
t0+127862.7s to t0+215857.3s : 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 127664.1s 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=357.7062 lat=+35.6044
and the galactic extinction in R band is 0.4 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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