GRB150212_630876_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20150212_175859926_000003_36790301    12 stars filter C [95321487.2s - 95321667.2s] expo=180s elev= 9.9deg humid= 77% sunelev=-11.8deg (moon at  76.0deg phase=0.46 elev=-63.0 )
AL_20150212_180214354_000003_36790301    11 stars filter R [95321681.8s - 95321861.8s] expo=180s elev= 9.6deg humid= 77% sunelev=-12.4deg (moon at  76.0deg phase=0.46 elev=-63.0 )
AL_20150212_180529354_000003_36790301    12 stars filter V [95321876.6s - 95322056.6s] expo=180s elev= 9.3deg humid= 77% sunelev=-12.9deg (moon at  76.0deg phase=0.46 elev=-63.0 )
AL_20150212_182330061_000003_36790401    22 stars filter C [95322957.5s - 95323137.5s] expo=180s elev= 7.9deg humid= 75% sunelev=-16.2deg (moon at  76.0deg phase=0.46 elev=-62.0 )
AL_20150212_182644545_000003_36790401    21 stars filter R [95323151.9s - 95323331.9s] expo=180s elev= 7.6deg humid= 75% sunelev=-16.8deg (moon at  76.0deg phase=0.46 elev=-62.0 )
AL_20150212_182958430_000003_36790401    14 stars filter V [95323345.7s - 95323525.7s] expo=180s elev= 7.4deg humid= 74% sunelev=-17.3deg (moon at  76.0deg phase=0.46 elev=-62.0 )
Informations from GCN notice:
This is not a GRB (a retractation has been edited)
Date of GRB : 2455962.9912571758 2012-02-05T11:47:24.620
Date of notice : 2455962.9915046296 2012-02-05T11:47:46.000
Refined position : no
RA(J2000.0) : 40.1 02h40m24s0
DEC(J2000.0) : 61.22 +61d13m12s00
Error box : x=-52595:-52486 y=90749:90857 (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=77.6540653084 lat=17.9218094986
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.062
Assuming Rv=3.1: Av=0.204 Ar=0.165 Ai=0.119 Extinction map E(B-V) from Schlegel:

Field of View is about 66 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 150212: TAROT Calern observatory optical observations
Klotz A., Turpin D. (IRAP-CNRS-OMP),
Boer M., Gendre B., Siellez K., Dereli H., Bardho O. (UNS-CNRS-OCA),
Atteia J.L. (IRAP-CNRS-OMP) report:

We imaged the field of GRB 150212 detected by SWIFT
(trigger 513505) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 95321487.2s after the GRB trigger
(95321466.1s after the notice). The elevation of the field decreased from
9 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+95321487.2s to t0+95321667.2s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+95321681.8s to t0+95321861.8s : R > 16.2

We co-added a series of exposures:
t0+95321681.8s to t0+95323525.7s : 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 95321487.2s 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= 77.6541 lat=+17.9218
and the galactic extinction in R band is 0.2 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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