GRB130812_566228_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20130813_034627397_000002_87487601     0 star  filter C [47922957.3s - 47923137.3s] expo=180s elev= 6.3deg humid= 53% sunelev=-8.9deg (moon at 113.0deg phase=0.41 elev=-59.0 )
AL_20130813_034938382_000002_87487601     0 star  filter R [47923148.3s - 47923328.3s] expo=180s elev= 6.8deg humid= 53% sunelev=-8.4deg (moon at 113.0deg phase=0.41 elev=-59.0 )
AL_20130813_035249353_000002_87487601     0 star  filter V [47923339.3s - 47923519.3s] expo=180s elev= 7.4deg humid= 53% sunelev=-8.0deg (moon at 113.0deg phase=0.41 elev=-59.0 )
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

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=220.321846 lat=-15.192893
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.080
Assuming Rv=3.1: Av=0.266 Ar=0.215 Ai=0.156 Extinction map E(B-V) from Schlegel:

Field of View is about 64 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 130812: 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 130812 detected by SWIFT
(trigger 513505) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 47922957.3s after the GRB trigger
(47922936.2s after the notice). The elevation of the field increased from
6 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 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+47922957.3s to t0+47923137.3s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+47923148.3s to t0+47923328.3s : R > 16.2

We co-added a series of exposures:
t0+47923148.3s to t0+47923519.3s : 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 47922957.3s 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=220.3218 lat=-15.1929
and the galactic extinction in R band is 0.2 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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