GRB110926_201246_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20110926_201406980_110926_20120     0 star  filter C [   93.6s -   153.6s] expo= 60s elev=-6.5deg humid= 73% sunelev=-30.4deg (moon at  84.0deg phase=0.06 elev=-38.0 )
AL_20110926_201451401_110926_20120     0 star  filter C [  168.1s -   198.1s] expo= 30s elev=-6.6deg humid= 73% sunelev=-30.6deg (moon at  84.0deg phase=0.06 elev=-38.0 )
AL_20110926_201531697_110926_20120     0 star  filter C [  208.3s -   238.3s] expo= 30s elev=-6.7deg humid= 73% sunelev=-30.7deg (moon at  84.0deg phase=0.06 elev=-38.0 )
AL_20110926_201611745_110926_20120     0 star  filter C [  248.4s -   278.4s] expo= 30s elev=-6.8deg humid= 73% sunelev=-30.8deg (moon at  84.0deg phase=0.06 elev=-38.0 )
AL_20110926_201651995_110926_20120     0 star  filter C [  288.7s -   318.7s] expo= 30s elev=-6.9deg humid= 73% sunelev=-30.9deg (moon at  84.0deg phase=0.06 elev=-38.0 )
AL_20110926_201732745_110926_20120     0 star  filter C [  329.4s -   359.4s] expo= 30s elev=-6.9deg humid= 73% sunelev=-31.0deg (moon at  84.0deg phase=0.06 elev=-38.0 )
Informations from GCN notice:
This is not a GRB (a retractation has been edited)
Date of GRB : 2455831.3413031250 2011-09-26T20:11:28.590
Date of notice : 2455831.3422106481 2011-09-26T20:12:46.999
Refined position : yes (error radius=348.0 arcsec)
RA(J2000.0) : 258.161000 17h12m38s6
DEC(J2000.0) : -37.649000 -37d38m56s40

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=348.938965 lat=0.911704
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=4.143
Assuming Rv=3.1: Av=13.732 Ar=11.073 Ai=8.037 Extinction map E(B-V) from Schlegel:

Field of View is about 55 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 110926: 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 110926 detected by SWIFT
(trigger 504101) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 93.6s after the GRB trigger
(14.9s after the notice). The elevation of the field decreased from
-6 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2011-09-26T20:11:28.319

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+93.6s to t0+153.6s : R > 15.1

The second image is 30.0s exposure in tracking mode:
t0+168.1s to t0+198.1s : R > 16.2

We co-added a series of exposures:
t0+168.1s to t0+359.4s : 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 93.6s 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=348.9390 lat= +0.9117
and the galactic extinction in R band is 11.1 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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