GRBAGILE4_20170227_G275404 at TAROT Calern observatory

TAROT Calern observatory log of images

IM_20170227_022506295_000000_50831601    38 stars filter C [212354922181.1s - 212354922301.1s] expo=120s elev= 8.5deg humid= 87% sunelev=-40.6deg (moon at  60.0deg phase=0.04 elev=-43.0 )
IM_20170227_022717029_000000_50831601    40 stars filter C [212354922311.8s - 212354922431.8s] expo=120s elev= 8.9deg humid= 87% sunelev=-40.3deg (moon at  60.0deg phase=0.04 elev=-43.0 )
IM_20170227_025106160_000000_50831701    38 stars filter C [212354923741.0s - 212354923861.0s] expo=120s elev=13.2deg humid= 89% sunelev=-36.5deg (moon at  60.0deg phase=0.04 elev=-39.0 )
IM_20170227_025113067_000000_50831701     0 star  filter C [148696603200.0s - 148696603320.0s] expo=120s elev=13.6deg humid= 90% sunelev=-63.4deg (moon at  60.0deg phase=0.04 elev=-39.0 )
No informations from GCN notice.

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=46.1691689838 lat=-0.338971751607
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.732
Assuming Rv=3.1: Av=2.426 Ar=1.956 Ai=1.420 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 AGILE4: TAROT Calern observatory optical observations
Klotz A., Turpin D., Atteia J.L. (CNRS-OMP-IRAP),
Boer, M., Laugier, R. (CNRS-ARTEMIS),
Gendre B. (UVI - Etelman Obs.) report:

We imaged the field of GRB AGILE4 detected by XXX
(trigger XXX) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 212354922181.1s after the GRB trigger
(XXXs after the notice). The elevation of the field increased from
8 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 1858-11-17T00:00:00.000

The first image is trailed with a duration of 120.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any OT with a limiting magnitude of:
t0+212354922181.1s to t0+212354922301.1s : R > 15.1

The second image is 120.0s exposure in tracking mode:
t0+212354922311.8s to t0+212354922431.8s : R > 16.2

We co-added a series of exposures:
t0+212354922311.8s to t0+148696603320.0s : R > 17.7
---- YES
We detect a new fading source in the error box given by XXX
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 212354922181.1s 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= 46.1692 lat= -0.3390
and the galactic extinction in R band is 2.0 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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