GRB131127_579571_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20131127_165601706_000002_97342001    31 stars filter C [57128731.8s - 57128911.8s] expo=180s elev=81.7deg humid= 58% sunelev=-10.0deg (moon at 139.0deg phase=0.38 elev=-41.0 )
AL_20131127_165912729_000002_97342001    53 stars filter R [57128922.8s - 57129102.8s] expo=180s elev=82.0deg humid= 58% sunelev=-10.5deg (moon at 139.0deg phase=0.38 elev=-42.0 )
AL_20131127_170223683_000002_97342001    40 stars filter V [57129113.8s - 57129293.8s] expo=180s elev=82.3deg humid= 59% sunelev=-11.1deg (moon at 139.0deg phase=0.38 elev=-42.0 )
AL_20131127_172040442_000002_97342101    68 stars filter C [57130210.5s - 57130390.5s] expo=180s elev=82.9deg humid= 59% sunelev=-14.2deg (moon at 139.0deg phase=0.38 elev=-44.0 )
AL_20131127_172351192_000002_97342101    61 stars filter R [57130401.2s - 57130581.2s] expo=180s elev=82.8deg humid= 59% sunelev=-14.8deg (moon at 139.0deg phase=0.38 elev=-44.0 )
AL_20131127_172702411_000002_97342101    56 stars filter V [57130592.5s - 57130772.5s] expo=180s elev=82.7deg humid= 59% sunelev=-15.3deg (moon at 139.0deg phase=0.38 elev=-44.0 )
AL_20131127_174500514_000002_97342201    71 stars filter C [57131670.7s - 57131850.7s] expo=180s elev=81.3deg humid= 60% sunelev=-18.5deg (moon at 139.0deg phase=0.38 elev=-46.0 )
AL_20131127_174811596_000002_97342201    60 stars filter R [57131861.7s - 57132041.7s] expo=180s elev=80.9deg humid= 61% sunelev=-19.0deg (moon at 139.0deg phase=0.38 elev=-46.0 )
AL_20131127_175123018_000002_97342201    48 stars filter V [57132053.1s - 57132233.1s] expo=180s elev=80.5deg humid= 62% sunelev=-19.6deg (moon at 139.0deg phase=0.38 elev=-46.0 )
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=-40978:-40869 y=55651:55760 (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=90.3862051709 lat=-15.9460787283
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.150
Assuming Rv=3.1: Av=0.498 Ar=0.402 Ai=0.292 Extinction map E(B-V) from Schlegel:

Field of View is about 65 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 131127: 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 131127 detected by SWIFT
(trigger 513505) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 57128731.8s after the GRB trigger
(57128710.7s after the notice). The elevation of the field increased from
81 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+57128731.8s to t0+57128911.8s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+57128922.8s to t0+57129102.8s : R > 16.2

We co-added a series of exposures:
t0+57128922.8s to t0+57131850.7s : 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 57128731.8s 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= 90.3862 lat=-15.9461
and the galactic extinction in R band is 0.4 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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