GRB110928_193515_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20110928_193604045_110928_19350   107 stars filter C [ 1088.4s -  1118.4s] expo= 30s elev=21.6deg humid= 70% sunelev=-25.1deg (moon at  74.0deg phase=0.11 elev=-22.0 )
AL_20110928_193644310_110928_19350   102 stars filter C [ 1128.7s -  1158.7s] expo= 30s elev=21.6deg humid= 70% sunelev=-25.2deg (moon at  74.0deg phase=0.11 elev=-22.0 )
AL_20110928_193724374_110928_19350   103 stars filter C [ 1168.8s -  1198.8s] expo= 30s elev=21.5deg humid= 70% sunelev=-25.3deg (moon at  74.0deg phase=0.11 elev=-22.0 )
AL_20110928_193805326_110928_19350   112 stars filter C [ 1209.7s -  1239.7s] expo= 30s elev=21.4deg humid= 70% sunelev=-25.4deg (moon at  74.0deg phase=0.11 elev=-22.0 )
AL_20110928_193845139_110928_19350   104 stars filter C [ 1249.6s -  1279.6s] expo= 30s elev=21.4deg humid= 70% sunelev=-25.5deg (moon at  74.0deg phase=0.11 elev=-22.0 )
AL_20110928_193925170_110928_19350   103 stars filter C [ 1289.6s -  1319.6s] expo= 30s elev=21.3deg humid= 70% sunelev=-25.6deg (moon at  74.0deg phase=0.11 elev=-22.0 )
Informations from GCN notice:
This is a GRB
Date of GRB : 2455833.3037104169 2011-09-28T19:17:20.580
Date of notice : 2455833.3161458331 2011-09-28T19:35:14.999
Refined position : no
RA(J2000.0) : 278.950000 18h35m48s0
DEC(J2000.0) : -19.328000 -19d19m40s79
Error box : x=10:119 y=9:118 (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=13.946609 lat=-5.375071
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.961
Assuming Rv=3.1: Av=3.186 Ar=2.569 Ai=1.864 Extinction map E(B-V) from Schlegel:

Field of View is about 58 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 504307) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 1088.4s after the GRB trigger
(14.0s after the notice). The elevation of the field decreased from
21 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2011-09-28T19:17:20.544

The first image is trailed with a duration of 30.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any OT with a limiting magnitude of:
t0+1088.4s to t0+1118.4s : R > 15.1

The second image is 30.0s exposure in tracking mode:
t0+1128.7s to t0+1158.7s : R > 16.2

We co-added a series of exposures:
t0+1128.7s to t0+1319.6s : 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 1088.4s 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= 13.9466 lat= -5.3751
and the galactic extinction in R band is 2.6 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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