GRB111221_021609_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20111221_021728711_111221_02160     0 star  filter C [   95.8s -   155.8s] expo= 60s elev=13.4deg humid= 50% sunelev=-50.1deg (moon at 112.0deg phase=0.27 elev= -9.0 )
AL_20111221_021813617_111221_02160     0 star  filter C [  170.8s -   200.8s] expo= 30s elev=13.3deg humid= 50% sunelev=-49.9deg (moon at 112.0deg phase=0.27 elev= -9.0 )
AL_20111221_021854132_111221_02160     0 star  filter C [  211.3s -   241.3s] expo= 30s elev=13.2deg humid= 50% sunelev=-49.8deg (moon at 112.0deg phase=0.27 elev= -9.0 )
AL_20111221_021934617_111221_02160     0 star  filter C [  251.8s -   281.8s] expo= 30s elev=13.2deg humid= 50% sunelev=-49.6deg (moon at 112.0deg phase=0.27 elev= -9.0 )
AL_20111221_022015117_111221_02160     0 star  filter C [  292.3s -   322.3s] expo= 30s elev=13.1deg humid= 50% sunelev=-49.5deg (moon at 112.0deg phase=0.27 elev= -9.0 )
AL_20111221_022055648_111221_02160     0 star  filter C [  332.8s -   362.8s] expo= 30s elev=13.0deg humid= 50% sunelev=-49.4deg (moon at 112.0deg phase=0.27 elev= -8.0 )
Informations from GCN notice:
This is a GRB
Date of GRB : 2455916.5936078704 2011-12-21T02:14:47.720
Date of notice : 2455916.5945370370 2011-12-21T02:16:07.999
Refined position : no
RA(J2000.0) : 91.175000 06h04m42s0
DEC(J2000.0) : -23.979000 -23d58m44s39
Error box : x=9:118 y=10:119 (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=230.151864 lat=-20.487249
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.294
Assuming Rv=3.1: Av=0.975 Ar=0.786 Ai=0.570 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 111221: TAROT Calern observatory optical observations
Klotz A. (IRAP-OMP), Gendre B. (ASDC/INAF-OAR),
Boer M. (OCA-CNRS), Atteia J.L. (IRAP-OMP) report:

We imaged the field of GRB 111221 detected by SWIFT
(trigger 510075) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 95.8s after the GRB trigger
(15.7s after the notice). The elevation of the field decreased from
13 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2011-12-21T02:14:47.903

The first image is trailed with a duration of 60.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any OT with a limiting magnitude of:
t0+95.8s to t0+155.8s : R > 15.1

The second image is 30.0s exposure in tracking mode:
t0+170.8s to t0+200.8s : R > 16.2

We co-added a series of exposures:
t0+170.8s to t0+362.8s : 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 95.8s 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=230.1519 lat=-20.4872
and the galactic extinction in R band is 0.8 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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