GRB120107_174416_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20120107_174505269_120107_17440     6 stars filter C [ 1957.7s -  1987.7s] expo= 30s elev=60.4deg humid= 35% sunelev=-16.7deg (moon at  34.0deg phase=0.90 elev=+30.0 )
AL_20120107_174546003_120107_17440     6 stars filter C [ 1998.4s -  2028.4s] expo= 30s elev=60.6deg humid= 35% sunelev=-16.8deg (moon at  34.0deg phase=0.90 elev=+30.0 )
AL_20120107_174626488_120107_17440     6 stars filter C [ 2038.9s -  2068.9s] expo= 30s elev=60.7deg humid= 35% sunelev=-16.9deg (moon at  34.0deg phase=0.90 elev=+30.0 )
AL_20120107_174707222_120107_17440     7 stars filter C [ 2079.7s -  2109.7s] expo= 30s elev=60.8deg humid= 35% sunelev=-17.0deg (moon at  34.0deg phase=0.90 elev=+30.0 )
AL_20120107_174747520_120107_17440     6 stars filter C [ 2120.0s -  2150.0s] expo= 30s elev=60.9deg humid= 36% sunelev=-17.1deg (moon at  34.0deg phase=0.90 elev=+30.0 )
AL_20120107_174828317_120107_17440     6 stars filter C [ 2160.7s -  2190.7s] expo= 30s elev=61.0deg humid= 36% sunelev=-17.2deg (moon at  34.0deg phase=0.90 elev=+30.0 )
Informations from GCN notice:
This is not a GRB (a retractation has been edited)
Date of GRB : 2455934.2165768519 2012-01-07T17:11:52.240
Date of notice : 2455934.2390740742 2012-01-07T17:44:16.000
Refined position : yes (error radius=282.0 arcsec)
RA(J2000.0) : 51.612000 03h26m26s8
DEC(J2000.0) : 28.696000 +28d41m45s60
Error box : x=-20:150 y=-21:150 (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=159.534444 lat=-22.946410
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.171
Assuming Rv=3.1: Av=0.566 Ar=0.457 Ai=0.331 Extinction map E(B-V) from Schlegel:

Field of View is about 70 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 120107: TAROT Calern observatory optical observations
Klotz A. (IRAP-OMP), Gendre B. (ASDC/INAF-OAR),
Boer M. (OCA-CNRS), Atteia J.L. (IRAP-OMP) report:

We imaged the field of GRB 120107 detected by SWIFT
(trigger 511289) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 1957.7s after the GRB trigger
(14.2s after the notice). The elevation of the field increased from
60 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2012-01-07T17:11:52.511

The first image is trailed with a duration of 30.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any OT with a limiting magnitude of:
t0+1957.7s to t0+1987.7s : R > 15.1

The second image is 30.0s exposure in tracking mode:
t0+1998.4s to t0+2028.4s : R > 16.2

We co-added a series of exposures:
t0+1998.4s to t0+2190.7s : 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 1957.7s 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=159.5344 lat=-22.9464
and the galactic extinction in R band is 0.5 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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