GRB2_20170302_G275404 at TAROT Calern observatory

TAROT Calern observatory log of images

IM_20170302_021946123_000000_51157801    30 stars filter C [212355181060.9s - 212355181180.9s] expo=120s elev= 8.5deg humid= 65% sunelev=-40.4deg (moon at  95.0deg phase=0.25 elev=-40.0 )
IM_20170302_022156936_000000_51157801    36 stars filter C [212355181191.7s - 212355181311.7s] expo=120s elev= 8.9deg humid= 65% sunelev=-40.1deg (moon at  95.0deg phase=0.25 elev=-40.0 )
IM_20170302_024355569_000000_51157901    35 stars filter C [212355182510.4s - 212355182630.4s] expo=120s elev=12.8deg humid= 64% sunelev=-36.7deg (moon at  96.0deg phase=0.25 elev=-40.0 )
IM_20170302_024606288_000000_51157901    38 stars filter C [212355182641.2s - 212355182761.2s] expo=120s elev=13.2deg humid= 64% sunelev=-36.4deg (moon at  96.0deg phase=0.25 elev=-40.0 )
IM_20170302_030805968_000000_51158001    41 stars filter C [212355183960.8s - 212355184080.8s] expo=120s elev=17.2deg humid= 66% sunelev=-32.8deg (moon at  96.0deg phase=0.25 elev=-40.0 )
IM_20170302_031016936_000000_51158001    38 stars filter C [212355184091.8s - 212355184211.8s] expo=120s elev=17.5deg humid= 66% sunelev=-32.5deg (moon at  96.0deg phase=0.25 elev=-40.0 )
IM_20170302_033216184_000000_51158101    49 stars filter C [212355185411.0s - 212355185531.0s] expo=120s elev=21.5deg humid= 69% sunelev=-28.8deg (moon at  96.0deg phase=0.25 elev=-39.0 )
IM_20170302_033427137_000000_51158101    44 stars filter C [212355185542.0s - 212355185662.0s] expo=120s elev=21.9deg humid= 69% sunelev=-28.4deg (moon at  96.0deg phase=0.25 elev=-39.0 )
IM_20170302_035626076_000000_51158201    49 stars filter C [212355186860.9s - 212355186980.9s] expo=120s elev=25.8deg humid= 68% sunelev=-24.6deg (moon at  96.0deg phase=0.26 elev=-37.0 )
IM_20170302_035836625_000000_51158201    53 stars filter C [212355186991.4s - 212355187111.4s] expo=120s elev=26.2deg humid= 67% sunelev=-24.2deg (moon at  96.0deg phase=0.26 elev=-37.0 )
IM_20170302_042035995_000000_51158301    56 stars filter C [212355188310.9s - 212355188430.9s] expo=120s elev=30.1deg humid= 69% sunelev=-20.3deg (moon at  97.0deg phase=0.26 elev=-35.0 )
IM_20170302_042247011_000000_51158301    62 stars filter C [212355188441.8s - 212355188561.8s] expo=120s elev=30.4deg humid= 68% sunelev=-19.9deg (moon at  97.0deg phase=0.26 elev=-35.0 )
IM_20170302_044446170_000000_51158401    53 stars filter C [212355189761.0s - 212355189881.0s] expo=120s elev=34.2deg humid= 68% sunelev=-16.0deg (moon at  97.0deg phase=0.26 elev=-33.0 )
IM_20170302_044656685_000000_51158401    63 stars filter C [212355189891.5s - 212355190011.5s] expo=120s elev=34.6deg humid= 68% sunelev=-15.6deg (moon at  97.0deg phase=0.26 elev=-33.0 )
IM_20170302_050856127_000000_51158501    37 stars filter C [212355191211.0s - 212355191331.0s] expo=120s elev=38.2deg humid= 70% sunelev=-11.6deg (moon at  97.0deg phase=0.26 elev=-30.0 )
IM_20170302_051106631_000000_51158501    36 stars filter C [212355191341.5s - 212355191461.5s] expo=120s elev=38.5deg humid= 70% sunelev=-11.2deg (moon at  97.0deg 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=44.6020827378 lat=-1.16557467638
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=1.384
Assuming Rv=3.1: Av=4.589 Ar=3.700 Ai=2.685 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 2_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 2_2017 detected by XXX
(trigger XXX) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 212355181060.9s 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+212355181060.9s to t0+212355181180.9s : R > 15.1

The second image is 120.0s exposure in tracking mode:
t0+212355181191.7s to t0+212355181311.7s : R > 16.2

We co-added a series of exposures:
t0+212355181191.7s to t0+212355185531.0s : 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 212355181060.9s 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= 44.6021 lat= -1.1656
and the galactic extinction in R band is 3.7 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.