GRB18_20170314_G277583 at TAROT Calern observatory

TAROT Calern observatory log of images

IM_20170314_212044714_000000_52960701    50 stars filter C [212356286319.5s - 212356286439.5s] expo=120s elev=57.0deg humid= 73% sunelev=-38.0deg (moon at  99.0deg phase=0.85 elev=+16.0 )
IM_20170314_212255469_000000_52960701    54 stars filter C [212356286450.2s - 212356286570.2s] expo=120s elev=56.6deg humid= 73% sunelev=-38.3deg (moon at  99.0deg phase=0.85 elev=+16.0 )
IM_20170314_232625130_000000_52960801    43 stars filter C [212356293859.9s - 212356293979.9s] expo=120s elev=34.5deg humid= 75% sunelev=-48.3deg (moon at 100.0deg phase=0.84 elev=+33.0 )
IM_20170314_232835880_000000_52960801    43 stars filter C [212356293990.7s - 212356294110.7s] expo=120s elev=34.1deg humid= 74% sunelev=-48.4deg (moon at 100.0deg phase=0.84 elev=+33.0 )
IM_20170315_212045107_000000_52969401    52 stars filter C [212356372719.9s - 212356372839.9s] expo=120s elev=56.3deg humid= 71% sunelev=-37.7deg (moon at 112.0deg phase=0.79 elev= +6.0 )
IM_20170315_212256544_000000_52969401    53 stars filter C [212356372851.4s - 212356372971.4s] expo=120s elev=56.0deg humid= 72% sunelev=-38.0deg (moon at 112.0deg phase=0.79 elev= +6.0 )
IM_20170315_232625337_000000_52969501    48 stars filter C [212356380260.1s - 212356380380.1s] expo=120s elev=33.8deg humid= 67% sunelev=-48.0deg (moon at 112.0deg phase=0.78 elev=+24.0 )
IM_20170315_232836087_000000_52969501    52 stars filter C [212356380390.9s - 212356380510.9s] expo=120s elev=33.4deg humid= 66% sunelev=-48.0deg (moon at 112.0deg phase=0.78 elev=+25.0 )
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=186.981366323 lat=12.3117576782
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.084
Assuming Rv=3.1: Av=0.279 Ar=0.225 Ai=0.163 Extinction map E(B-V) from Schlegel:

Field of View is about 62 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 18_201: 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 18_201 detected by XXX
(trigger XXX) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 212356286319.5s after the GRB trigger
(XXXs after the notice). The elevation of the field decreased from
57 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+212356286319.5s to t0+212356286439.5s : R > 15.1

The second image is 120.0s exposure in tracking mode:
t0+212356286450.2s to t0+212356286570.2s : R > 16.2

We co-added a series of exposures:
t0+212356286450.2s to t0+212356380380.1s : 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 212356286319.5s 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=186.9814 lat=+12.3118
and the galactic extinction in R band is 0.2 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.