GRB110928_015235_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20110928_015354297_110928_01520     0 star  filter C [   77.6s -   137.6s] expo= 60s elev=-3.3deg humid= 63% sunelev=-36.3deg (moon at  78.0deg phase=0.06 elev=-46.0 )
AL_20110928_015438970_110928_01520     0 star  filter C [  152.3s -   182.3s] expo= 30s elev=-3.3deg humid= 63% sunelev=-36.1deg (moon at  78.0deg phase=0.06 elev=-46.0 )
AL_20110928_015519001_110928_01520     0 star  filter C [  192.3s -   222.3s] expo= 30s elev=-3.4deg humid= 63% sunelev=-36.0deg (moon at  78.0deg phase=0.06 elev=-46.0 )
AL_20110928_015559984_110928_01520     0 star  filter C [  233.3s -   263.3s] expo= 30s elev=-3.5deg humid= 63% sunelev=-35.9deg (moon at  78.0deg phase=0.06 elev=-46.0 )
AL_20110928_015640048_110928_01520     0 star  filter C [  273.3s -   303.3s] expo= 30s elev=-3.5deg humid= 63% sunelev=-35.8deg (moon at  78.0deg phase=0.06 elev=-46.0 )
AL_20110928_015721016_110928_01520     0 star  filter C [  314.3s -   344.3s] expo= 30s elev=-3.6deg humid= 64% sunelev=-35.7deg (moon at  78.0deg phase=0.06 elev=-46.0 )
Informations from GCN notice:
This is a GRB
Date of GRB : 2455832.5774511574 2011-09-28T01:51:31.779
Date of notice : 2455832.5781828705 2011-09-28T01:52:35.000
Refined position : no
RA(J2000.0) : 257.755000 17h11m01s2
DEC(J2000.0) : 36.570000 +36d34m11s99

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=60.201936 lat=35.095921
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.030
Assuming Rv=3.1: Av=0.101 Ar=0.081 Ai=0.059 Extinction map E(B-V) from Schlegel:

Field of View is about 84 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 110928: 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 110928 detected by SWIFT
(trigger 504215) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 77.6s after the GRB trigger
(14.3s after the notice). The elevation of the field decreased from
-3 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2011-09-28T01:51:31.680

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+77.6s to t0+137.6s : R > 15.1

The second image is 30.0s exposure in tracking mode:
t0+152.3s to t0+182.3s : R > 16.2

We co-added a series of exposures:
t0+152.3s to t0+344.3s : 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 77.6s 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= 60.2019 lat=+35.0959
and the galactic extinction in R band is 0.1 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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