GRB161218_034736_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20161218_043930341_000000_42986801     8 stars filter C [ 2928.8s -  3108.8s] expo=180s elev= 3.2deg humid= 27% sunelev=-25.0deg (moon at 101.0deg phase=0.69 elev=+54.0 )
AL_20161218_044241150_000000_42986801    11 stars filter C [ 3119.5s -  3299.5s] expo=180s elev= 3.8deg humid= 26% sunelev=-24.4deg (moon at 101.0deg phase=0.69 elev=+54.0 )
AL_20161218_044552572_000000_42986801    12 stars filter C [ 3311.0s -  3491.0s] expo=180s elev= 4.3deg humid= 26% sunelev=-23.8deg (moon at 101.0deg phase=0.69 elev=+53.0 )
AL_20161218_044916072_000000_42986901    11 stars filter C [ 3514.5s -  3694.5s] expo=180s elev= 4.9deg humid= 26% sunelev=-23.2deg (moon at 101.0deg phase=0.69 elev=+53.0 )
AL_20161218_045227084_000000_42986901    13 stars filter C [ 3705.5s -  3885.5s] expo=180s elev= 5.5deg humid= 26% sunelev=-22.7deg (moon at 101.0deg phase=0.69 elev=+53.0 )
AL_20161218_045538350_000000_42986901    13 stars filter C [ 3896.7s -  4076.7s] expo=180s elev= 6.0deg humid= 26% sunelev=-22.1deg (moon at 101.0deg phase=0.69 elev=+52.0 )
AL_20161218_045859444_000000_42987001    13 stars filter C [ 4097.9s -  4277.9s] expo=180s elev= 6.6deg humid= 26% sunelev=-21.5deg (moon at 101.0deg phase=0.69 elev=+52.0 )
AL_20161218_050210272_000000_42987001    13 stars filter C [ 4288.6s -  4468.6s] expo=180s elev= 7.1deg humid= 26% sunelev=-21.0deg (moon at 101.0deg phase=0.69 elev=+51.0 )
AL_20161218_050521643_000000_42987001    13 stars filter C [ 4480.1s -  4660.1s] expo=180s elev= 7.7deg humid= 27% sunelev=-20.4deg (moon at 101.0deg phase=0.69 elev=+51.0 )
AL_20161218_050843753_000000_42987101    13 stars filter C [ 4682.2s -  4862.2s] expo=180s elev= 8.3deg humid= 27% sunelev=-19.8deg (moon at 101.0deg phase=0.69 elev=+51.0 )
AL_20161218_051154753_000000_42987101    13 stars filter C [ 4873.2s -  5053.2s] expo=180s elev= 8.8deg humid= 27% sunelev=-19.3deg (moon at 101.0deg phase=0.69 elev=+50.0 )
AL_20161218_051506177_000000_42987101    14 stars filter C [ 5064.6s -  5244.6s] expo=180s elev= 9.4deg humid= 27% sunelev=-18.7deg (moon at 101.0deg phase=0.69 elev=+50.0 )
AL_20161218_051836723_000000_42987201    13 stars filter C [ 5275.1s -  5455.1s] expo=180s elev=10.0deg humid= 28% sunelev=-18.1deg (moon at 101.0deg phase=0.69 elev=+49.0 )
AL_20161218_052147708_000000_42987201    13 stars filter C [ 5466.1s -  5646.1s] expo=180s elev=10.5deg humid= 28% sunelev=-17.5deg (moon at 101.0deg phase=0.69 elev=+49.0 )
AL_20161218_052458916_000000_42987201    13 stars filter C [ 5657.3s -  5837.3s] expo=180s elev=11.1deg humid= 28% sunelev=-17.0deg (moon at 101.0deg phase=0.69 elev=+49.0 )
AL_20161218_052815385_000000_42987301    13 stars filter C [ 5853.8s -  6033.8s] expo=180s elev=11.7deg humid= 28% sunelev=-16.4deg (moon at 101.0deg phase=0.69 elev=+48.0 )
AL_20161218_053126103_000000_42987301    13 stars filter C [ 6044.6s -  6224.6s] expo=180s elev=12.2deg humid= 28% sunelev=-15.9deg (moon at 101.0deg phase=0.69 elev=+48.0 )
AL_20161218_053437135_000000_42987301    13 stars filter C [ 6235.6s -  6415.6s] expo=180s elev=12.7deg humid= 27% sunelev=-15.3deg (moon at 101.0deg phase=0.69 elev=+47.0 )
AL_20161218_053804589_000000_42987401    13 stars filter C [ 6443.0s -  6623.0s] expo=180s elev=13.3deg humid= 27% sunelev=-14.7deg (moon at 101.0deg phase=0.69 elev=+47.0 )
AL_20161218_054115823_000000_42987401    13 stars filter C [ 6634.2s -  6814.2s] expo=180s elev=13.9deg humid= 27% sunelev=-14.2deg (moon at 101.0deg phase=0.69 elev=+46.0 )
AL_20161218_054427005_000000_42987401    13 stars filter C [ 6825.4s -  7005.4s] expo=180s elev=14.4deg humid= 26% sunelev=-13.6deg (moon at 101.0deg phase=0.69 elev=+46.0 )
AL_20161218_054743583_000000_42987501     0 star  filter C [ 7022.0s -  7202.0s] expo=180s elev=15.0deg humid= 26% sunelev=-13.1deg (moon at 101.0deg phase=0.69 elev=+45.0 )
AL_20161218_055054739_000000_42987501     0 star  filter C [ 7213.2s -  7393.2s] expo=180s elev=15.5deg humid= 26% sunelev=-12.5deg (moon at 101.0deg phase=0.69 elev=+45.0 )
AL_20161218_055405999_000000_42987501     0 star  filter C [ 7404.4s -  7584.4s] expo=180s elev=16.0deg humid= 26% sunelev=-12.0deg (moon at 101.0deg phase=0.69 elev=+44.0 )
AL_20161218_055723467_000000_42987601     0 star  filter C [ 7601.9s -  7781.9s] expo=180s elev=16.6deg humid= 26% sunelev=-11.5deg (moon at 101.0deg phase=0.69 elev=+44.0 )
AL_20161218_060034671_000000_42987601     0 star  filter C [ 7793.1s -  7973.1s] expo=180s elev=17.1deg humid= 26% sunelev=-10.9deg (moon at 101.0deg phase=0.69 elev=+43.0 )
AL_20161218_060346144_000000_42987601     0 star  filter C [ 7984.5s -  8164.5s] expo=180s elev=17.6deg humid= 26% sunelev=-10.4deg (moon at 101.0deg phase=0.69 elev=+43.0 )
AL_20161218_060707503_000000_42987701     0 star  filter C [ 8186.0s -  8366.0s] expo=180s elev=18.2deg humid= 26% sunelev=-9.8deg (moon at 101.0deg phase=0.69 elev=+42.0 )
AL_20161218_061018472_000000_42987701     0 star  filter C [ 8376.9s -  8556.9s] expo=180s elev=18.7deg humid= 26% sunelev=-9.3deg (moon at 101.0deg phase=0.69 elev=+42.0 )
AL_20161218_061329269_000000_42987701     0 star  filter C [ 8567.7s -  8747.7s] expo=180s elev=19.2deg humid= 27% sunelev=-8.8deg (moon at 101.0deg phase=0.69 elev=+41.0 )
AL_20161218_061651149_000000_42987801     0 star  filter C [ 8769.6s -  8949.6s] expo=180s elev=19.8deg humid= 27% sunelev=-8.2deg (moon at 101.0deg phase=0.69 elev=+41.0 )
AL_20161218_062002602_000000_42987801     0 star  filter C [ 8961.0s -  9141.0s] expo=180s elev=20.3deg humid= 27% sunelev=-7.7deg (moon at 101.0deg phase=0.69 elev=+40.0 )
AL_20161218_062313571_000000_42987801     0 star  filter C [ 9152.0s -  9332.0s] expo=180s elev=20.8deg humid= 27% sunelev=-7.2deg (moon at 101.0deg phase=0.69 elev=+40.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457740.65806 2016-12-18T03:47:36.384
Decoded useful notice informations.
RA(J2000.0) : 245.257 16h21m01s6
DEC(J2000.0) : -4.1135 -04d06m48s59
Error radius : 3.0 arcmin

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=9.56878860543 lat=30.5935563186
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.211
Assuming Rv=3.1: Av=0.698 Ar=0.563 Ai=0.409 Extinction map E(B-V) from Schlegel:

Field of View is about 79 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 161218: 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 161218 detected by SWIFT
(trigger 727288) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 48.81min after the GRB trigger.
The elevation of the field increased from
3 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2016-12-18T03:47:36.384

The first image is trailed with a duration of 180.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any OT with a limiting magnitude of:
t0+2928.8s to t0+3108.8s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+3119.5s to t0+3299.5s : R > 16.2

We co-added a series of exposures:
t0+3119.5s to t0+4277.9s : R > 17.7
---- YES
We detect a new fading source in the error box given by SWIFT
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 48.81min 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=  9.5688 lat=+30.5936
and the galactic extinction in R band is 0.6 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.