GRB111204_133845_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20111204_203027826_000002_34384001     0 star  filter C [24594.5s - 24774.5s] expo=180s elev= 2.1deg humid= 81% sunelev=-48.4deg (moon at  48.0deg phase=0.65 elev=+49.0 )
AL_20111204_203337655_000002_34384001     0 star  filter C [24784.3s - 24964.3s] expo=180s elev= 1.8deg humid= 81% sunelev=-49.0deg (moon at  48.0deg phase=0.65 elev=+48.0 )
AL_20111204_203647678_000002_34384001     0 star  filter R [24974.3s - 25154.3s] expo=180s elev= 1.4deg humid= 82% sunelev=-49.5deg (moon at  48.0deg phase=0.65 elev=+48.0 )
AL_20111204_203958209_000002_34384001     0 star  filter C [25164.8s - 25344.8s] expo=180s elev= 1.1deg humid= 82% sunelev=-50.1deg (moon at  48.0deg phase=0.65 elev=+48.0 )
AL_20111204_204308255_000002_34384001     0 star  filter C [25354.9s - 25534.9s] expo=180s elev= 0.7deg humid= 82% sunelev=-50.6deg (moon at  48.0deg phase=0.65 elev=+47.0 )
AL_20111204_204618965_000002_34384001     0 star  filter R [25545.6s - 25725.6s] expo=180s elev= 0.4deg humid= 83% sunelev=-51.1deg (moon at  48.0deg phase=0.65 elev=+47.0 )
AL_20111204_205031638_000002_34384101     0 star  filter C [25798.3s - 25978.3s] expo=180s elev=-0.1deg humid= 83% sunelev=-51.9deg (moon at  48.0deg phase=0.65 elev=+47.0 )
AL_20111204_205341700_000002_34384101     0 star  filter C [25988.3s - 26168.3s] expo=180s elev=-1.1deg humid= 84% sunelev=-52.4deg (moon at  48.0deg phase=0.65 elev=+46.0 )
AL_20111204_205651497_000002_34384101     0 star  filter R [26178.1s - 26358.1s] expo=180s elev=-1.5deg humid= 84% sunelev=-52.9deg (moon at  48.0deg phase=0.65 elev=+46.0 )
AL_20111204_210002233_000002_34384101     0 star  filter C [26368.9s - 26548.9s] expo=180s elev=-1.9deg humid= 84% sunelev=-53.4deg (moon at  48.0deg phase=0.65 elev=+45.0 )
AL_20111204_210312030_000002_34384101     0 star  filter C [26558.7s - 26738.7s] expo=180s elev=-2.3deg humid= 84% sunelev=-54.0deg (moon at  48.0deg phase=0.65 elev=+45.0 )
AL_20111204_210621862_000002_34384101     0 star  filter R [26748.5s - 26928.5s] expo=180s elev=-2.7deg humid= 84% sunelev=-54.5deg (moon at  48.0deg phase=0.65 elev=+45.0 )
Informations from GCN notice:
This is a GRB
Date of GRB : 2455900.0676892363 2011-12-04T13:37:28.350
Date of notice : 2455900.0685763890 2011-12-04T13:38:45.000
Refined position : yes (error radius=3.9 arcsec)
RA(J2000.0) : 336.641000 22h26m33s8
DEC(J2000.0) : -31.395000 -31d23m41s99

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=16.409998 lat=-58.258827
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.026
Assuming Rv=3.1: Av=0.088 Ar=0.071 Ai=0.051 Extinction map E(B-V) from Schlegel:

Field of View is about 143 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 111204: TAROT Calern observatory optical observations
Klotz A. (CESR-OMP), Gendre B. (ASDC),
Boer M. (OHP-OAMP), Atteia J.L. (LATT-OMP) report:

We imaged the field of GRB 111204 detected by SWIFT
(trigger 509018) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 24594.5s after the GRB trigger
(24517.9s after the notice). The elevation of the field decreased from
2 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2011-12-04T13:37:28.415

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+24594.5s to t0+24774.5s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+24784.3s to t0+24964.3s : R > 16.2

We co-added a series of exposures:
t0+24784.3s to t0+25978.3s : 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 24594.5s 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= 16.4100 lat=-58.2588
and the galactic extinction in R band is 0.1 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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