GRB141031_617149_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20141031_172313538_000003_27833901    13 stars filter C [86333563.6s - 86333743.6s] expo=180s elev=53.8deg humid= 94% sunelev=-10.6deg (moon at  65.0deg phase=0.54 elev=+33.0 )
AL_20141031_172624757_000003_27833901    16 stars filter C [86333754.8s - 86333934.8s] expo=180s elev=54.4deg humid= 94% sunelev=-11.2deg (moon at  65.0deg phase=0.54 elev=+33.0 )
AL_20141031_172935288_000003_27833901    15 stars filter R [86333945.4s - 86334125.4s] expo=180s elev=54.9deg humid= 94% sunelev=-11.8deg (moon at  65.0deg phase=0.54 elev=+33.0 )
AL_20141031_173300617_000003_27834001    16 stars filter C [86334150.7s - 86334330.7s] expo=180s elev=55.5deg humid= 94% sunelev=-12.4deg (moon at  65.0deg phase=0.54 elev=+33.0 )
AL_20141031_173611161_000003_27834001    19 stars filter C [86334341.2s - 86334521.2s] expo=180s elev=56.1deg humid= 94% sunelev=-13.0deg (moon at  64.0deg phase=0.54 elev=+33.0 )
AL_20141031_173922145_000003_27834001    16 stars filter R [86334532.2s - 86334712.2s] expo=180s elev=56.6deg humid= 93% sunelev=-13.5deg (moon at  64.0deg phase=0.54 elev=+33.0 )
AL_20141031_174243583_000003_27834101    22 stars filter C [86334733.6s - 86334913.6s] expo=180s elev=57.2deg humid= 94% sunelev=-14.1deg (moon at  64.0deg phase=0.54 elev=+33.0 )
AL_20141031_174553820_000003_27834101    23 stars filter C [86334923.9s - 86335103.9s] expo=180s elev=57.8deg humid= 94% sunelev=-14.7deg (moon at  64.0deg phase=0.54 elev=+33.0 )
AL_20141031_174904383_000003_27834101    19 stars filter R [86335114.4s - 86335294.4s] expo=180s elev=58.4deg humid= 93% sunelev=-15.3deg (moon at  64.0deg phase=0.54 elev=+33.0 )
AL_20141031_175111883_000003_27834201     0 star  filter C [86335318.6s - 86335498.6s] expo=180s elev=59.0deg humid= 92% sunelev=-15.9deg (moon at  64.0deg phase=0.54 elev=+33.0 )
AL_20141031_191022147_000003_27835001    24 stars filter C [86339992.2s - 86340172.2s] expo=180s elev=73.0deg humid= 87% sunelev=-29.9deg (moon at  64.0deg phase=0.55 elev=+32.0 )
AL_20141031_191333397_000003_27835001    26 stars filter C [86340183.4s - 86340363.4s] expo=180s elev=73.6deg humid= 87% sunelev=-30.5deg (moon at  64.0deg phase=0.55 elev=+32.0 )
AL_20141031_191643673_000003_27835001    14 stars filter R [86340373.7s - 86340553.7s] expo=180s elev=74.1deg humid= 87% sunelev=-31.1deg (moon at  64.0deg phase=0.55 elev=+31.0 )
AL_20141031_193201561_000003_27835101    20 stars filter C [86341291.6s - 86341471.6s] expo=180s elev=76.9deg humid= 88% sunelev=-33.8deg (moon at  64.0deg phase=0.55 elev=+30.0 )
AL_20141031_193512546_000003_27835101    20 stars filter R [86341482.6s - 86341662.6s] expo=180s elev=77.5deg humid= 88% sunelev=-34.3deg (moon at  64.0deg phase=0.55 elev=+30.0 )
AL_20141031_193823763_000003_27835101    15 stars filter V [86341673.8s - 86341853.8s] expo=180s elev=78.0deg humid= 88% sunelev=-34.9deg (moon at  64.0deg phase=0.55 elev=+30.0 )
AL_20141031_195629141_000003_27835201    19 stars filter C [86342759.2s - 86342939.2s] expo=180s elev=81.3deg humid= 86% sunelev=-38.0deg (moon at  64.0deg phase=0.55 elev=+28.0 )
AL_20141031_195940844_000003_27835201    19 stars filter R [86342950.9s - 86343130.9s] expo=180s elev=81.8deg humid= 87% sunelev=-38.6deg (moon at  64.0deg phase=0.55 elev=+28.0 )
AL_20141031_200251406_000003_27835201    12 stars filter V [86343141.4s - 86343321.4s] expo=180s elev=82.4deg humid= 87% sunelev=-39.1deg (moon at  64.0deg phase=0.55 elev=+28.0 )
AL_20141031_202108215_000003_27835301    22 stars filter C [86344238.3s - 86344418.3s] expo=180s elev=85.5deg humid= 88% sunelev=-42.2deg (moon at  64.0deg phase=0.55 elev=+26.0 )
AL_20141031_202419184_000003_27835301    20 stars filter R [86344429.2s - 86344609.2s] expo=180s elev=86.0deg humid= 88% sunelev=-42.7deg (moon at  64.0deg phase=0.55 elev=+26.0 )
AL_20141031_202729663_000003_27835301    14 stars filter V [86344619.8s - 86344799.8s] expo=180s elev=86.5deg humid= 88% sunelev=-43.2deg (moon at  64.0deg phase=0.55 elev=+25.0 )
AL_20141031_204448162_000003_27835401     0 star  filter C [86345700.1s - 86345880.1s] expo=180s elev=87.6deg humid= 85% sunelev=-46.1deg (moon at  63.0deg phase=0.55 elev=+23.0 )
AL_20141031_213425597_000003_27835601    25 stars filter C [86348635.6s - 86348815.6s] expo=180s elev=80.1deg humid= 56% sunelev=-53.1deg (moon at  63.0deg phase=0.55 elev=+17.0 )
AL_20141031_213736590_000003_27835601    15 stars filter R [86348826.6s - 86349006.6s] expo=180s elev=79.5deg humid= 56% sunelev=-53.5deg (moon at  63.0deg phase=0.55 elev=+17.0 )
AL_20141031_214047105_000003_27835601    14 stars filter V [86349017.1s - 86349197.1s] expo=180s elev=79.0deg humid= 56% sunelev=-53.9deg (moon at  63.0deg phase=0.55 elev=+16.0 )
AL_20141031_215855616_000003_27835701    24 stars filter C [86350105.7s - 86350285.7s] expo=180s elev=75.7deg humid= 67% sunelev=-56.0deg (moon at  63.0deg phase=0.55 elev=+14.0 )
AL_20141031_220206616_000003_27835701    17 stars filter R [86350296.6s - 86350476.6s] expo=180s elev=75.1deg humid= 68% sunelev=-56.3deg (moon at  63.0deg phase=0.55 elev=+13.0 )
AL_20141031_220518023_000003_27835701    16 stars filter V [86350488.1s - 86350668.1s] expo=180s elev=74.5deg humid= 69% sunelev=-56.6deg (moon at  63.0deg phase=0.55 elev=+13.0 )
AL_20141031_222324820_000003_27835801    16 stars filter C [86351574.9s - 86351754.9s] expo=180s elev=71.2deg humid= 63% sunelev=-58.3deg (moon at  63.0deg phase=0.55 elev=+10.0 )
AL_20141031_222636039_000003_27835801    12 stars filter R [86351766.1s - 86351946.1s] expo=180s elev=70.7deg humid= 62% sunelev=-58.5deg (moon at  63.0deg phase=0.56 elev= +9.0 )
AL_20141031_222946304_000003_27835801    12 stars filter V [86351956.4s - 86352136.4s] expo=180s elev=70.1deg humid= 63% sunelev=-58.7deg (moon at  63.0deg phase=0.56 elev= +9.0 )
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=-24215:-24105 y=31819:31928 (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=110.276746226 lat=-19.9353859421
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.095
Assuming Rv=3.1: Av=0.315 Ar=0.254 Ai=0.184 Extinction map E(B-V) from Schlegel:

Field of View is about 68 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 141031: TAROT Calern observatory optical observations
Klotz A. (IRAP-CNRS-OMP), Gendre B. (IRAP-CNRS-OMP),
Boer M., Siellez K., Dereli H., Bardho O. (UNS-CNRS-OCA),
Atteia J.L. (IRAP-CNRS-OMP) report:

We imaged the field of GRB 141031 detected by SWIFT
(trigger 513505) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 86333563.6s after the GRB trigger
(86333542.5s after the notice). The elevation of the field increased from
53 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+86333563.6s to t0+86333743.6s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+86333754.8s to t0+86333934.8s : R > 16.2

We co-added a series of exposures:
t0+86333754.8s to t0+86334913.6s : 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 86333563.6s 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=110.2767 lat=-19.9354
and the galactic extinction in R band is 0.3 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.