GRB130102_181054_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20130102_184718490_000002_68865601    68 stars filter C [ 1999.2s -  2179.2s] expo=180s elev=38.0deg humid= 90% sunelev=-27.7deg (moon at 121.0deg phase=0.66 elev=-27.0 )
AL_20130102_185029959_000002_68865601    58 stars filter R [ 2190.6s -  2370.6s] expo=180s elev=37.5deg humid= 89% sunelev=-28.3deg (moon at 121.0deg phase=0.66 elev=-27.0 )
AL_20130102_185346999_000002_68865701    69 stars filter C [ 2387.6s -  2567.6s] expo=180s elev=37.0deg humid= 89% sunelev=-28.8deg (moon at 121.0deg phase=0.66 elev=-27.0 )
AL_20130102_185658000_000002_68865701    64 stars filter C [ 2578.9s -  2758.9s] expo=180s elev=36.6deg humid= 89% sunelev=-29.4deg (moon at 121.0deg phase=0.66 elev=-26.0 )
AL_20130102_190008984_000002_68865701    52 stars filter R [ 2769.8s -  2949.8s] expo=180s elev=36.1deg humid= 89% sunelev=-30.0deg (moon at 121.0deg phase=0.66 elev=-26.0 )
AL_20130102_190328272_000002_68865801    66 stars filter C [ 2969.2s -  3149.2s] expo=180s elev=35.6deg humid= 89% sunelev=-30.6deg (moon at 121.0deg phase=0.66 elev=-25.0 )
AL_20130102_190639052_000002_68865801    59 stars filter C [ 3159.9s -  3339.9s] expo=180s elev=35.2deg humid= 89% sunelev=-31.2deg (moon at 121.0deg phase=0.66 elev=-25.0 )
AL_20130102_190950708_000002_68865801    58 stars filter R [ 3351.6s -  3531.6s] expo=180s elev=34.7deg humid= 89% sunelev=-31.7deg (moon at 121.0deg phase=0.66 elev=-24.0 )
AL_20130102_191312340_000002_68865901    64 stars filter C [ 3553.2s -  3733.2s] expo=180s elev=34.3deg humid= 88% sunelev=-32.3deg (moon at 121.0deg phase=0.66 elev=-24.0 )
AL_20130102_191623777_000002_68865901    63 stars filter C [ 3744.7s -  3924.7s] expo=180s elev=33.8deg humid= 89% sunelev=-32.9deg (moon at 121.0deg phase=0.66 elev=-23.0 )
AL_20130102_191935215_000002_68865901    61 stars filter R [ 3936.1s -  4116.1s] expo=180s elev=33.4deg humid= 87% sunelev=-33.5deg (moon at 121.0deg phase=0.66 elev=-23.0 )
AL_20130102_192255753_000002_68866001    58 stars filter C [ 4136.6s -  4316.6s] expo=180s elev=32.9deg humid= 88% sunelev=-34.1deg (moon at 121.0deg phase=0.66 elev=-22.0 )
AL_20130102_192606518_000002_68866001    68 stars filter C [ 4327.3s -  4507.3s] expo=180s elev=32.5deg humid= 89% sunelev=-34.7deg (moon at 121.0deg phase=0.65 elev=-22.0 )
AL_20130102_192917674_000002_68866001    54 stars filter R [ 4518.5s -  4698.5s] expo=180s elev=32.0deg humid= 89% sunelev=-35.2deg (moon at 121.0deg phase=0.65 elev=-21.0 )
AL_20130102_193240261_000002_68866101    62 stars filter C [ 4721.1s -  4901.1s] expo=180s elev=31.6deg humid= 89% sunelev=-35.9deg (moon at 121.0deg phase=0.65 elev=-21.0 )
AL_20130102_193551714_000002_68866101    67 stars filter C [ 4912.6s -  5092.6s] expo=180s elev=31.1deg humid= 89% sunelev=-36.4deg (moon at 121.0deg phase=0.65 elev=-20.0 )
AL_20130102_193903354_000002_68866101    48 stars filter R [ 5104.2s -  5284.2s] expo=180s elev=30.7deg humid= 90% sunelev=-37.0deg (moon at 121.0deg phase=0.65 elev=-20.0 )
AL_20130102_194224125_000002_68866201    69 stars filter C [ 5305.0s -  5485.0s] expo=180s elev=30.2deg humid= 90% sunelev=-37.6deg (moon at 121.0deg phase=0.65 elev=-19.0 )
AL_20130102_194535296_000002_68866201    62 stars filter C [ 5496.2s -  5676.2s] expo=180s elev=29.8deg humid= 90% sunelev=-38.2deg (moon at 121.0deg phase=0.65 elev=-19.0 )
AL_20130102_194846015_000002_68866201    56 stars filter R [ 5686.9s -  5866.9s] expo=180s elev=29.4deg humid= 90% sunelev=-38.8deg (moon at 121.0deg phase=0.65 elev=-18.0 )
AL_20130102_195208364_000002_68866301    59 stars filter C [ 5889.3s -  6069.3s] expo=180s elev=28.9deg humid= 90% sunelev=-39.4deg (moon at 121.0deg phase=0.65 elev=-18.0 )
AL_20130102_195519146_000002_68866301    51 stars filter C [ 6080.0s -  6260.0s] expo=180s elev=28.5deg humid= 89% sunelev=-39.9deg (moon at 121.0deg phase=0.65 elev=-17.0 )
AL_20130102_195829864_000002_68866301    56 stars filter R [ 6270.7s -  6450.7s] expo=180s elev=28.1deg humid= 88% sunelev=-40.5deg (moon at 121.0deg phase=0.65 elev=-16.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2456295.25757 2013-01-02T18:10:54.047
Decoded useful notice informations.
RA(J2000.0) : 311.4232 20h45m41s5
DEC(J2000.0) : 49.8173 +49d49m02s27
Error radius : 2.2 arcsec
Error box : x=93:94 y=43:44 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=88.334473 lat=4.222749
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=1.872
Assuming Rv=3.1: Av=6.205 Ar=5.004 Ai=3.631 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 130102: TAROT Calern observatory optical observations
Klotz A. (IRAP-CNRS-OMP), Gendre B. (ASDC/INAF-OAR),
Boer M. (UNS-CNRS-OCA), Atteia J.L. (IRAP-CNRS-OMP) report:

We imaged the field of GRB 130102 detected by SWIFT
(trigger 544784) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 33.32min after the GRB trigger.
The elevation of the field decreased from
37 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2013-01-02T18:10:54.047

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+1999.2s to t0+2179.2s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+2190.6s to t0+2370.6s : R > 16.2

We co-added a series of exposures:
t0+2190.6s to t0+3339.9s : 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 33.32min 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= 88.3345 lat= +4.2227
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.