GRB1_20170302_G275404 at TAROT Calern observatory

TAROT Calern observatory log of images

IM_20170302_021456119_000000_51156901    28 stars filter C [212355180770.9s - 212355180890.9s] expo=120s elev= 8.9deg humid= 65% sunelev=-41.1deg (moon at  97.0deg phase=0.25 elev=-40.0 )
IM_20170302_021706842_000000_51156901    42 stars filter C [212355180901.6s - 212355181021.6s] expo=120s elev= 9.2deg humid= 66% sunelev=-40.8deg (moon at  97.0deg phase=0.25 elev=-40.0 )
IM_20170302_023905975_000000_51157001    39 stars filter C [212355182220.8s - 212355182340.8s] expo=120s elev=13.2deg humid= 64% sunelev=-37.5deg (moon at  97.0deg phase=0.25 elev=-40.0 )
IM_20170302_024116772_000000_51157001    47 stars filter C [212355182351.6s - 212355182471.6s] expo=120s elev=13.6deg humid= 64% sunelev=-37.1deg (moon at  97.0deg phase=0.25 elev=-40.0 )
IM_20170302_030315668_000000_51157101    49 stars filter C [212355183670.5s - 212355183790.5s] expo=120s elev=17.6deg humid= 65% sunelev=-33.6deg (moon at  97.0deg phase=0.25 elev=-40.0 )
IM_20170302_030526199_000000_51157101    47 stars filter C [212355183801.1s - 212355183921.1s] expo=120s elev=17.9deg humid= 66% sunelev=-33.3deg (moon at  98.0deg phase=0.25 elev=-40.0 )
IM_20170302_032725637_000000_51157201    49 stars filter C [212355185120.5s - 212355185240.5s] expo=120s elev=21.9deg humid= 68% sunelev=-29.6deg (moon at  98.0deg phase=0.25 elev=-39.0 )
IM_20170302_032936653_000000_51157201    56 stars filter C [212355185251.5s - 212355185371.5s] expo=120s elev=22.3deg humid= 69% sunelev=-29.2deg (moon at  98.0deg phase=0.25 elev=-39.0 )
IM_20170302_035135982_000000_51157301    51 stars filter C [212355186570.9s - 212355186690.9s] expo=120s elev=26.2deg humid= 68% sunelev=-25.4deg (moon at  98.0deg phase=0.26 elev=-37.0 )
IM_20170302_035346997_000000_51157301    55 stars filter C [212355186701.9s - 212355186821.9s] expo=120s elev=26.6deg humid= 69% sunelev=-25.0deg (moon at  98.0deg phase=0.26 elev=-37.0 )
IM_20170302_041546183_000000_51157401    53 stars filter C [212355188021.1s - 212355188141.1s] expo=120s elev=30.4deg humid= 68% sunelev=-21.2deg (moon at  98.0deg phase=0.26 elev=-36.0 )
IM_20170302_041756901_000000_51157401    69 stars filter C [212355188151.8s - 212355188271.8s] expo=120s elev=30.8deg humid= 68% sunelev=-20.8deg (moon at  98.0deg phase=0.26 elev=-35.0 )
IM_20170302_043956170_000000_51157501    74 stars filter C [212355189471.0s - 212355189591.0s] expo=120s elev=34.6deg humid= 69% sunelev=-16.8deg (moon at  99.0deg phase=0.26 elev=-33.0 )
IM_20170302_044207576_000000_51157501    77 stars filter C [212355189602.4s - 212355189722.4s] expo=120s elev=34.9deg humid= 68% sunelev=-16.4deg (moon at  99.0deg phase=0.26 elev=-33.0 )
IM_20170302_050406252_000000_51157601    52 stars filter C [212355190921.2s - 212355191041.2s] expo=120s elev=38.5deg humid= 69% sunelev=-12.5deg (moon at  99.0deg phase=0.26 elev=-31.0 )
IM_20170302_050617237_000000_51157601    47 stars filter C [212355191052.2s - 212355191172.2s] expo=120s elev=38.9deg humid= 69% sunelev=-12.1deg (moon at  99.0deg phase=0.26 elev=-30.0 )
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=43.7941944119 lat=0.376719621918
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=9.691
Assuming Rv=3.1: Av=32.124 Ar=25.903 Ai=18.800 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 1_2017: 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 1_2017 detected by XXX
(trigger XXX) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 212355180770.9s 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+212355180770.9s to t0+212355180890.9s : R > 15.1

The second image is 120.0s exposure in tracking mode:
t0+212355180901.6s to t0+212355181021.6s : R > 16.2

We co-added a series of exposures:
t0+212355180901.6s to t0+212355185240.5s : 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 212355180770.9s 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= 43.7942 lat= +0.3767
and the galactic extinction in R band is 25.9 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.