GRB121001_182302_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20121001_182540376_000000_00000001     0 star  filter C [   93.0s -   153.0s] expo= 60s elev=38.0deg humid= 93% sunelev=-13.8deg (moon at 109.0deg phase=0.89 elev= +7.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2456202.266 2012-10-01T18:23:02.399
Decoded useful notice informations.
RA(J2000.0) : 276.0327 18h24m07s8
DEC(J2000.0) : -5.6652 -05d39m54s72
Error radius : 6.1 arcsec

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=24.763922 lat=3.453751
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=1.377
Assuming Rv=3.1: Av=4.564 Ar=3.680 Ai=2.671
extmap.fit: Extinction map E(B-V) from Schlegel:

Field of View is about 57 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
GRBlog
ROTSE last GRB images

Example of a GCNC email for this burst

gcncirc@capella.gsfc.nasa.gov
GRB 121001: TAROT Calern observatory optical observations
----------------------------------------------------------------------
Klotz A. (IRAP-CNRS-OMP), Gendre B. (ASDC/INAF-OAR),
Boer M. (UNS-CNRS-OCA), Atteia J.L. (IRAP-CNRS-OMP) report:

We imaged the field of GRB 121001 detected by SWIFT
(trigger 535026) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 93.0s after the GRB trigger
(15.2s after the notice). The elevation of the field was at
38 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2012-10-01T18:23:02.399

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+93.0s to t0+153.0s : R > 15.1

---- 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 93.0s 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= 24.7639 lat= +3.4538
and the galactic extinction in R band is 3.7 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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