GRB111015_011400_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20111015_011523848_111015_01140     0 star  filter C [   98.2s -   158.2s] expo= 60s elev=-56.9deg humid= 50% sunelev=-46.2deg (moon at 147.0deg phase=0.82 elev=+66.0 )
AL_20111015_011608300_111015_01140     0 star  filter C [  172.7s -   202.7s] expo= 30s elev=-57.1deg humid= 49% sunelev=-46.0deg (moon at 147.0deg phase=0.82 elev=+66.0 )
AL_20111015_011648566_111015_01140     0 star  filter C [  213.0s -   243.0s] expo= 30s elev=-57.2deg humid= 49% sunelev=-46.0deg (moon at 147.0deg phase=0.82 elev=+66.0 )
AL_20111015_011728668_111015_01140     0 star  filter C [  253.0s -   283.0s] expo= 30s elev=-57.3deg humid= 49% sunelev=-45.9deg (moon at 147.0deg phase=0.82 elev=+66.0 )
AL_20111015_011809370_111015_01140     0 star  filter C [  293.7s -   323.7s] expo= 30s elev=-57.4deg humid= 49% sunelev=-45.8deg (moon at 147.0deg phase=0.82 elev=+66.0 )
AL_20111015_011850090_111015_01140     0 star  filter C [  334.5s -   364.5s] expo= 30s elev=-57.5deg humid= 49% sunelev=-45.7deg (moon at 147.0deg phase=0.82 elev=+66.0 )
Informations from GCN notice:
This is not a GRB (a retractation has been edited)
Date of GRB : 2455849.5504690972 2011-10-15T01:12:40.529
Date of notice : 2455849.5514004631 2011-10-15T01:14:01.000
Refined position : no
RA(J2000.0) : 265.215000 17h40m51s5
DEC(J2000.0) : -28.091000 -28d05m27s60

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=0.169707 lat=1.333551
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=1.858
Assuming Rv=3.1: Av=6.160 Ar=4.967 Ai=3.605 Extinction map E(B-V) from Schlegel:

Field of View is about 56 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 111015: 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 111015 detected by SWIFT
(trigger 505516) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 98.2s after the GRB trigger
(17.8s after the notice). The elevation of the field decreased from
-56 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2011-10-15T01:12:40.608

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+98.2s to t0+158.2s : R > 15.1

The second image is 30.0s exposure in tracking mode:
t0+172.7s to t0+202.7s : R > 16.2

We co-added a series of exposures:
t0+172.7s to t0+364.5s : 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 98.2s 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=  0.1697 lat= +1.3336
and the galactic extinction in R band is 5.0 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.