GRB130504_555096_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20130504_020855495_000002_78547401    91 stars filter C [39190825.5s - 39190885.5s] expo= 60s elev=29.0deg humid= 81% sunelev=-20.1deg (moon at  61.0deg phase=0.38 elev= +7.0 )
AL_20130504_020936182_000002_78547401    74 stars filter C [39190896.2s - 39190926.2s] expo= 30s elev=29.1deg humid= 81% sunelev=-19.9deg (moon at  61.0deg phase=0.38 elev= +7.0 )
AL_20130504_021016948_000002_78547401    80 stars filter C [39190937.0s - 39190967.0s] expo= 30s elev=29.1deg humid= 81% sunelev=-19.9deg (moon at  61.0deg phase=0.38 elev= +7.0 )
AL_20130504_021058135_000002_78547401    70 stars filter C [39190978.2s - 39191008.2s] expo= 30s elev=29.1deg humid= 81% sunelev=-19.8deg (moon at  61.0deg phase=0.38 elev= +7.0 )
AL_20130504_021139135_000002_78547401    76 stars filter C [39191019.2s - 39191049.2s] expo= 30s elev=29.1deg humid= 81% sunelev=-19.7deg (moon at  61.0deg phase=0.38 elev= +7.0 )
AL_20130504_021220104_000002_78547401    76 stars filter C [39191060.2s - 39191090.2s] expo= 30s elev=29.2deg humid= 82% sunelev=-19.6deg (moon at  61.0deg phase=0.38 elev= +8.0 )
AL_20130504_021427794_000002_78547501    91 stars filter C [39191127.8s - 39191217.8s] expo= 90s elev=29.2deg humid= 82% sunelev=-19.5deg (moon at  61.0deg phase=0.38 elev= +8.0 )
AL_20130504_021609482_000002_78547501    88 stars filter C [39191229.5s - 39191319.5s] expo= 90s elev=29.3deg humid= 82% sunelev=-19.3deg (moon at  62.0deg phase=0.38 elev= +8.0 )
AL_20130504_024733067_000002_78548001    90 stars filter C [39193023.1s - 39193203.1s] expo=180s elev=29.9deg humid= 85% sunelev=-15.4deg (moon at  62.0deg phase=0.38 elev=+13.0 )
AL_20130504_025044270_000002_78548001   102 stars filter C [39193214.3s - 39193394.3s] expo=180s elev=29.9deg humid= 83% sunelev=-15.0deg (moon at  62.0deg phase=0.38 elev=+14.0 )
AL_20130504_025355696_000002_78548001    75 stars filter R [39193405.8s - 39193585.8s] expo=180s elev=29.9deg humid= 83% sunelev=-14.5deg (moon at  62.0deg phase=0.38 elev=+14.0 )
AL_20130504_025715977_000002_78548101    80 stars filter C [39193606.0s - 39193786.0s] expo=180s elev=29.9deg humid= 84% sunelev=-14.1deg (moon at  62.0deg phase=0.38 elev=+15.0 )
AL_20130504_030027211_000002_78548101   109 stars filter C [39193797.2s - 39193977.2s] expo=180s elev=29.9deg humid= 83% sunelev=-13.6deg (moon at  62.0deg phase=0.38 elev=+15.0 )
AL_20130504_030339105_000002_78548101    68 stars filter R [39193989.1s - 39194169.1s] expo=180s elev=29.9deg humid= 83% sunelev=-13.2deg (moon at  62.0deg phase=0.38 elev=+16.0 )
AL_20130504_030700058_000002_78548201   103 stars filter C [39194190.1s - 39194370.1s] expo=180s elev=29.9deg humid= 83% sunelev=-12.7deg (moon at  62.0deg phase=0.38 elev=+16.0 )
AL_20130504_031011230_000002_78548201    87 stars filter C [39194381.3s - 39194561.3s] expo=180s elev=29.8deg humid= 82% sunelev=-12.2deg (moon at  62.0deg phase=0.38 elev=+17.0 )
AL_20130504_031322702_000002_78548201    63 stars filter R [39194572.7s - 39194752.7s] expo=180s elev=29.8deg humid= 82% sunelev=-11.8deg (moon at  62.0deg phase=0.38 elev=+17.0 )
AL_20130504_031644296_000002_78548301    80 stars filter C [39194774.4s - 39194954.4s] expo=180s elev=29.7deg humid= 82% sunelev=-11.3deg (moon at  62.0deg phase=0.38 elev=+18.0 )
AL_20130504_031955811_000002_78548301    65 stars filter C [39194965.8s - 39195145.8s] expo=180s elev=29.7deg humid= 81% sunelev=-10.8deg (moon at  62.0deg phase=0.38 elev=+18.0 )
AL_20130504_032306751_000002_78548301    63 stars filter R [39195156.8s - 39195336.8s] expo=180s elev=29.6deg humid= 81% sunelev=-10.3deg (moon at  62.0deg phase=0.38 elev=+19.0 )
AL_20130504_032628173_000002_78548401     0 star  filter C [39195358.2s - 39195538.2s] expo=180s elev=29.5deg humid= 81% sunelev=-9.8deg (moon at  62.0deg phase=0.38 elev=+20.0 )
AL_20130504_033251080_000002_78548401    37 stars filter R [39195741.1s - 39195921.1s] expo=180s elev=29.3deg humid= 80% sunelev=-8.8deg (moon at  62.0deg phase=0.38 elev=+20.0 )
Informations from GCN notice:
This is not a GRB (a retractation has been edited)
Date of GRB : 2455962.9912571758 2012-02-05T11:47:24.619
Date of notice : 2455962.9915046296 2012-02-05T11:47:45.999
Refined position : no
RA(J2000.0) : 40.100000 02h40m24s0
DEC(J2000.0) : 61.220000 +61d13m12s00
Error box : x=44747:44856 y=-89776:-89667 (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=13.646850 lat=1.560666
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=2.674
Assuming Rv=3.1: Av=8.865 Ar=7.148 Ai=5.188 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 130504: 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 130504 detected by SWIFT
(trigger 513505) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 39190825.5s after the GRB trigger
(39190804.4s after the notice). The elevation of the field increased from
29 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2012-02-05T11:47:24.864

The first image is trailed with a duration of 60.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any OT with a limiting magnitude of:
t0+39190825.5s to t0+39190885.5s : R > 15.1

The second image is 30.0s exposure in tracking mode:
t0+39190896.2s to t0+39190926.2s : R > 16.2

We co-added a series of exposures:
t0+39190896.2s to t0+39191217.8s : 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 39190825.5s 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= 13.6469 lat= +1.5607
and the galactic extinction in R band is 7.1 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.