GRB161017_175151_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20161017_220200678_000000_36031001     0 star  filter C [14824.4s - 15004.4s] expo=180s elev= 4.4deg humid= 86% sunelev=-51.9deg (moon at  84.0deg phase=0.86 elev=+40.0 )
AL_20161017_220511115_000000_36031001     0 star  filter C [15015.0s - 15195.0s] expo=180s elev= 4.6deg humid= 87% sunelev=-52.2deg (moon at  84.0deg phase=0.86 elev=+40.0 )
AL_20161017_220822339_000000_36031001     0 star  filter R [15206.2s - 15386.2s] expo=180s elev= 4.9deg humid= 87% sunelev=-52.5deg (moon at  84.0deg phase=0.86 elev=+41.0 )
AL_20161017_222630330_000000_36031101     4 stars filter C [16294.2s - 16474.2s] expo=180s elev= 6.6deg humid= 85% sunelev=-53.9deg (moon at  84.0deg phase=0.86 elev=+44.0 )
AL_20161017_222941596_000000_36031101     3 stars filter R [16485.4s - 16665.4s] expo=180s elev= 6.9deg humid= 83% sunelev=-54.1deg (moon at  84.0deg phase=0.86 elev=+44.0 )
AL_20161017_223252815_000000_36031101     2 stars filter V [16676.6s - 16856.6s] expo=180s elev= 7.2deg humid= 84% sunelev=-54.4deg (moon at  84.0deg phase=0.86 elev=+45.0 )
AL_20161017_231535668_000000_36031301     7 stars filter C [19239.5s - 19419.5s] expo=180s elev=11.8deg humid= 88% sunelev=-55.8deg (moon at  83.0deg phase=0.86 elev=+51.0 )
AL_20161017_231846622_000000_36031301     3 stars filter R [19430.5s - 19610.5s] expo=180s elev=12.1deg humid= 88% sunelev=-55.8deg (moon at  83.0deg phase=0.85 elev=+51.0 )
AL_20161017_232158059_000000_36031301     0 star  filter V [19621.9s - 19801.9s] expo=180s elev=12.5deg humid= 87% sunelev=-55.8deg (moon at  83.0deg phase=0.85 elev=+51.0 )
AL_20161017_233957890_000000_36031401    11 stars filter C [20701.7s - 20881.7s] expo=180s elev=14.7deg humid= 82% sunelev=-55.6deg (moon at  83.0deg phase=0.85 elev=+54.0 )
AL_20161017_234308843_000000_36031401     7 stars filter R [20892.7s - 21072.7s] expo=180s elev=15.1deg humid= 81% sunelev=-55.5deg (moon at  83.0deg phase=0.85 elev=+54.0 )
AL_20161017_234619827_000000_36031401     6 stars filter V [21083.6s - 21263.6s] expo=180s elev=15.5deg humid= 81% sunelev=-55.4deg (moon at  83.0deg phase=0.85 elev=+54.0 )
AL_20161018_000429227_000000_36031501     0 star  filter C [22173.1s - 22353.1s] expo=180s elev=17.8deg humid= 81% sunelev=-54.5deg (moon at  83.0deg phase=0.85 elev=+56.0 )
AL_20161018_000740493_000000_36031501     0 star  filter R [22364.3s - 22544.3s] expo=180s elev=18.2deg humid= 80% sunelev=-54.3deg (moon at  83.0deg phase=0.85 elev=+56.0 )
AL_20161018_001051722_000000_36031501     0 star  filter V [22555.5s - 22735.5s] expo=180s elev=18.7deg humid= 79% sunelev=-54.1deg (moon at  83.0deg phase=0.85 elev=+56.0 )
AL_20161018_003213020_000000_36031601     2 stars filter R [23836.8s - 24016.8s] expo=180s elev=21.6deg humid= 78% sunelev=-52.4deg (moon at  83.0deg phase=0.85 elev=+58.0 )
AL_20161018_003524458_000000_36031601     2 stars filter V [24028.2s - 24208.2s] expo=180s elev=22.0deg humid= 77% sunelev=-52.1deg (moon at  83.0deg phase=0.85 elev=+58.0 )
AL_20161018_005328032_000000_36031701    10 stars filter C [25111.8s - 25291.8s] expo=180s elev=24.6deg humid= 78% sunelev=-50.3deg (moon at  83.0deg phase=0.85 elev=+59.0 )
AL_20161018_005639032_000000_36031701     8 stars filter R [25302.8s - 25482.8s] expo=180s elev=25.0deg humid= 78% sunelev=-49.9deg (moon at  83.0deg phase=0.85 elev=+59.0 )
AL_20161018_005950226_000000_36031701    10 stars filter V [25494.0s - 25674.0s] expo=180s elev=25.5deg humid= 78% sunelev=-49.5deg (moon at  83.0deg phase=0.85 elev=+59.0 )
AL_20161018_011808196_000000_36031801    11 stars filter C [26592.0s - 26772.0s] expo=180s elev=28.2deg humid= 82% sunelev=-47.3deg (moon at  82.0deg phase=0.85 elev=+59.0 )
AL_20161018_012119634_000000_36031801    11 stars filter R [26783.5s - 26963.5s] expo=180s elev=28.7deg humid= 81% sunelev=-46.9deg (moon at  82.0deg phase=0.85 elev=+59.0 )
AL_20161018_012431322_000000_36031801     3 stars filter V [26975.1s - 27155.1s] expo=180s elev=29.2deg humid= 81% sunelev=-46.4deg (moon at  82.0deg phase=0.85 elev=+58.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457679.24434 2016-10-17T17:51:50.976
Decoded useful notice informations.
RA(J2000.0) : 142.7691 09h31m04s5
DEC(J2000.0) : 43.1267 +43d07m36s12
Error radius : 0.7 arcsec
Error box : x=62:62 y=49:49 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=177.712045251 lat=46.7528258802
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.021
Assuming Rv=3.1: Av=0.068 Ar=0.055 Ai=0.040
extmap.fit: Extinction map E(B-V) from Schlegel:

Field of View is about 106 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
GRBlog
ROTSE last GRB images

Example of a GCNC email for this burst

gcncirc@capella.gsfc.nasa.gov
GRB 161017: TAROT Calern observatory optical observations
----------------------------------------------------------------------
Klotz A., Turpin D. (IRAP-CNRS-OMP),
Boer M., Gendre B., Siellez K., Dereli H., Bardho O. (UNS-CNRS-OCA),
Atteia J.L. (IRAP-CNRS-OMP) report:

We imaged the field of GRB 161017 detected by SWIFT
(trigger 718023) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 4.12h after the GRB trigger.
The elevation of the field increased from
4 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2016-10-17T17:51:50.976

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+14824.4s to t0+15004.4s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+15015.0s to t0+15195.0s : R > 16.2

We co-added a series of exposures:
t0+15015.0s to t0+19419.5s : 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 4.12h 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=177.7120 lat=+46.7528
and the galactic extinction in R band is 0.1 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.
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