GRB150211_630714_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20150211_180447436_000003_36696801     0 star  filter C [95235435.5s - 95235615.5s] expo=180s elev=10.0deg humid= 87% sunelev=-13.0deg (moon at  73.0deg phase=0.52 elev=-58.0 )
AL_20150211_180800952_000003_36696801     0 star  filter R [95235629.1s - 95235809.1s] expo=180s elev= 9.9deg humid= 87% sunelev=-13.6deg (moon at  73.0deg phase=0.52 elev=-58.0 )
AL_20150211_181113999_000003_36696801     2 stars filter V [95235822.1s - 95236002.1s] expo=180s elev= 9.8deg humid= 88% sunelev=-14.2deg (moon at  73.0deg phase=0.52 elev=-58.0 )
AL_20150211_182923515_000003_36696901     0 star  filter C [95236911.6s - 95237091.6s] expo=180s elev= 9.5deg humid= 87% sunelev=-17.5deg (moon at  73.0deg phase=0.52 elev=-56.0 )
AL_20150211_183236843_000003_36696901     0 star  filter R [95237105.0s - 95237285.0s] expo=180s elev= 9.4deg humid= 86% sunelev=-18.0deg (moon at  73.0deg phase=0.52 elev=-56.0 )
AL_20150211_183550303_000003_36696901     0 star  filter V [95237298.4s - 95237478.4s] expo=180s elev= 9.4deg humid= 86% sunelev=-18.6deg (moon at  73.0deg phase=0.52 elev=-55.0 )
AL_20150211_185344086_000003_36697001     0 star  filter C [95238372.2s - 95238552.2s] expo=180s elev= 9.2deg humid= 73% sunelev=-21.9deg (moon at  73.0deg phase=0.52 elev=-53.0 )
AL_20150211_185657891_000003_36697001     0 star  filter R [95238565.8s - 95238745.8s] expo=180s elev= 9.2deg humid= 71% sunelev=-22.4deg (moon at  73.0deg phase=0.52 elev=-53.0 )
AL_20150211_190011391_000003_36697001     0 star  filter V [95238759.5s - 95238939.5s] expo=180s elev= 9.2deg humid= 72% sunelev=-23.0deg (moon at  73.0deg phase=0.52 elev=-53.0 )
AL_20150211_191816619_000003_36697101     0 star  filter C [95239844.6s - 95240024.6s] expo=180s elev= 9.2deg humid= 68% sunelev=-26.3deg (moon at  73.0deg phase=0.52 elev=-50.0 )
AL_20150211_192130619_000003_36697101     0 star  filter R [95240038.7s - 95240218.7s] expo=180s elev= 9.3deg humid= 65% sunelev=-26.9deg (moon at  73.0deg phase=0.52 elev=-50.0 )
AL_20150211_192444541_000003_36697101     0 star  filter V [95240232.5s - 95240412.5s] expo=180s elev= 9.3deg humid= 67% sunelev=-27.4deg (moon at  73.0deg phase=0.52 elev=-49.0 )
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=33769:33879 y=-103698:-103589 (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=83.5403149289 lat=37.7817698921
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.020
Assuming Rv=3.1: Av=0.067 Ar=0.054 Ai=0.039 Extinction map E(B-V) from Schlegel:

Field of View is about 88 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 150211: 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 150211 detected by SWIFT
(trigger 513505) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 95235435.5s after the GRB trigger
(95235414.4s after the notice). The elevation of the field decreased from
10 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+95235435.5s to t0+95235615.5s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+95235629.1s to t0+95235809.1s : R > 16.2

We co-added a series of exposures:
t0+95235629.1s to t0+95238552.2s : 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 95235435.5s 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= 83.5403 lat=+37.7818
and the galactic extinction in R band is 0.1 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.