GRB3_20170302_G275404 at TAROT Calern observatory

TAROT Calern observatory log of images

IM_20170302_022435998_000000_51158701    31 stars filter C [212355181350.7s - 212355181470.7s] expo=120s elev=10.5deg humid= 65% sunelev=-39.7deg (moon at  95.0deg phase=0.25 elev=-40.0 )
IM_20170302_022647851_000000_51158701    34 stars filter C [212355181482.6s - 212355181602.6s] expo=120s elev=10.9deg humid= 65% sunelev=-39.4deg (moon at  95.0deg phase=0.25 elev=-40.0 )
IM_20170302_024846266_000000_51158801    36 stars filter C [212355182801.1s - 212355182921.1s] expo=120s elev=14.9deg humid= 63% sunelev=-36.0deg (moon at  95.0deg phase=0.25 elev=-40.0 )
IM_20170302_025057704_000000_51158801    34 stars filter C [212355182932.6s - 212355183052.6s] expo=120s elev=15.3deg humid= 64% sunelev=-35.6deg (moon at  95.0deg phase=0.25 elev=-40.0 )
IM_20170302_031256171_000000_51158901    36 stars filter C [212355184251.1s - 212355184371.1s] expo=120s elev=19.2deg humid= 67% sunelev=-32.0deg (moon at  96.0deg phase=0.25 elev=-39.0 )
IM_20170302_031507202_000000_51158901    34 stars filter C [212355184382.1s - 212355184502.1s] expo=120s elev=19.6deg humid= 67% sunelev=-31.7deg (moon at  96.0deg phase=0.25 elev=-39.0 )
IM_20170302_033705059_000000_51159001    42 stars filter C [212355185699.9s - 212355185819.9s] expo=120s elev=23.6deg humid= 69% sunelev=-27.9deg (moon at  96.0deg phase=0.26 elev=-38.0 )
IM_20170302_033915756_000000_51159001    43 stars filter C [212355185830.6s - 212355185950.6s] expo=120s elev=24.0deg humid= 68% sunelev=-27.6deg (moon at  96.0deg phase=0.26 elev=-38.0 )
IM_20170302_040115875_000000_51159101    48 stars filter C [212355187150.7s - 212355187270.7s] expo=120s elev=27.9deg humid= 67% sunelev=-23.7deg (moon at  96.0deg phase=0.26 elev=-37.0 )
IM_20170302_040326375_000000_51159101    42 stars filter C [212355187281.2s - 212355187401.2s] expo=120s elev=28.3deg humid= 67% sunelev=-23.3deg (moon at  96.0deg phase=0.26 elev=-37.0 )
IM_20170302_042525792_000000_51159201    51 stars filter C [212355188600.7s - 212355188720.7s] expo=120s elev=32.2deg humid= 68% sunelev=-19.4deg (moon at  96.0deg phase=0.26 elev=-35.0 )
IM_20170302_042737245_000000_51159201    47 stars filter C [212355188732.1s - 212355188852.1s] expo=120s elev=32.5deg humid= 68% sunelev=-19.1deg (moon at  96.0deg phase=0.26 elev=-35.0 )
IM_20170302_044935984_000000_51159301    51 stars filter C [212355190050.8s - 212355190170.8s] expo=120s elev=36.3deg humid= 68% sunelev=-15.1deg (moon at  97.0deg phase=0.26 elev=-32.0 )
IM_20170302_045147359_000000_51159301    49 stars filter C [212355190182.3s - 212355190302.3s] expo=120s elev=36.7deg humid= 69% sunelev=-14.7deg (moon at  97.0deg phase=0.26 elev=-32.0 )
IM_20170302_051346225_000000_51159401    25 stars filter C [212355191501.0s - 212355191621.0s] expo=120s elev=40.3deg humid= 70% sunelev=-10.7deg (moon at  97.0deg phase=0.26 elev=-30.0 )
IM_20170302_051557615_000000_51159401     0 star  filter C [212355191632.5s - 212355191752.5s] expo=120s elev=40.7deg humid= 70% sunelev=-10.3deg (moon at  97.0deg phase=0.26 elev=-29.0 )
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 3_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 3_2017 detected by XXX
(trigger XXX) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 212355181350.7s after the GRB trigger
(XXXs after the notice). The elevation of the field increased from
10 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+212355181350.7s to t0+212355181470.7s : R > 15.1

The second image is 120.0s exposure in tracking mode:
t0+212355181482.6s to t0+212355181602.6s : R > 16.2

We co-added a series of exposures:
t0+212355181482.6s to t0+212355185819.9s : 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 212355181350.7s 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.

This message may be cited.