GRB4_20170302_G275404 at TAROT Calern observatory

TAROT Calern observatory log of images

IM_20170302_022925944_000000_51159501    13 stars filter C [212355181640.8s - 212355181760.8s] expo=120s elev=10.1deg humid= 65% sunelev=-39.0deg (moon at  97.0deg phase=0.25 elev=-40.0 )
IM_20170302_023137163_000000_51159501    18 stars filter C [212355181772.0s - 212355181892.0s] expo=120s elev=10.5deg humid= 65% sunelev=-38.6deg (moon at  97.0deg phase=0.25 elev=-40.0 )
IM_20170302_025336126_000000_51159601    18 stars filter C [212355183090.9s - 212355183210.9s] expo=120s elev=14.4deg humid= 63% sunelev=-35.2deg (moon at  97.0deg phase=0.25 elev=-40.0 )
IM_20170302_025546813_000000_51159601    20 stars filter C [212355183221.7s - 212355183341.7s] expo=120s elev=14.8deg humid= 63% sunelev=-34.8deg (moon at  98.0deg phase=0.25 elev=-40.0 )
IM_20170302_031745780_000000_51159701    19 stars filter C [212355184540.6s - 212355184660.6s] expo=120s elev=18.8deg humid= 67% sunelev=-31.2deg (moon at  98.0deg phase=0.25 elev=-39.0 )
IM_20170302_031957702_000000_51159701    24 stars filter C [212355184672.6s - 212355184792.6s] expo=120s elev=19.2deg humid= 67% sunelev=-30.9deg (moon at  98.0deg phase=0.25 elev=-39.0 )
IM_20170302_034154788_000000_51159801    20 stars filter C [212355185989.7s - 212355186109.7s] expo=120s elev=23.1deg humid= 68% sunelev=-27.1deg (moon at  98.0deg phase=0.26 elev=-38.0 )
IM_20170302_034405303_000000_51159801    27 stars filter C [212355186120.2s - 212355186240.2s] expo=120s elev=23.5deg humid= 68% sunelev=-26.7deg (moon at  98.0deg phase=0.26 elev=-38.0 )
IM_20170302_040605000_000000_51159901    28 stars filter C [212355187439.8s - 212355187559.8s] expo=120s elev=27.3deg humid= 67% sunelev=-22.9deg (moon at  98.0deg phase=0.26 elev=-36.0 )
IM_20170302_040815979_000000_51159901    28 stars filter C [212355187570.8s - 212355187690.8s] expo=120s elev=27.7deg humid= 68% sunelev=-22.5deg (moon at  98.0deg phase=0.26 elev=-36.0 )
IM_20170302_043016526_000000_51160001    28 stars filter C [212355188891.4s - 212355189011.4s] expo=120s elev=31.5deg humid= 68% sunelev=-18.6deg (moon at  99.0deg phase=0.26 elev=-34.0 )
IM_20170302_043227729_000000_51160001    33 stars filter C [212355189022.6s - 212355189142.6s] expo=120s elev=31.8deg humid= 68% sunelev=-18.2deg (moon at  99.0deg phase=0.26 elev=-34.0 )
IM_20170302_045425828_000000_51160101    28 stars filter C [212355190340.6s - 212355190460.6s] expo=120s elev=35.4deg humid= 68% sunelev=-14.2deg (moon at  99.0deg phase=0.26 elev=-32.0 )
IM_20170302_045637000_000000_51160101    29 stars filter C [212355190471.8s - 212355190591.8s] expo=120s elev=35.8deg humid= 68% sunelev=-13.8deg (moon at  99.0deg phase=0.26 elev=-32.0 )
IM_20170302_052046231_000000_51160201     0 star  filter C [212355191921.1s - 212355192041.1s] expo=120s elev=39.6deg humid= 70% sunelev=-9.5deg (moon at  99.0deg 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=42.1303178214 lat=-0.609833019088
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=1.330
Assuming Rv=3.1: Av=4.407 Ar=3.554 Ai=2.579 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 4_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 4_2017 detected by XXX
(trigger XXX) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 212355181640.8s 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+212355181640.8s to t0+212355181760.8s : R > 15.1

The second image is 120.0s exposure in tracking mode:
t0+212355181772.0s to t0+212355181892.0s : R > 16.2

We co-added a series of exposures:
t0+212355181772.0s to t0+212355186109.7s : 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 212355181640.8s 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= 42.1303 lat= -0.6098
and the galactic extinction in R band is 3.6 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.