GRB171115_185121_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20171115_185439434_000000_00000001     0 star  filter C [  133.5s -   193.5s] expo= 60s elev=23.0deg humid= 32% sunelev=-30.2deg (moon at  77.0deg phase=0.17 elev=-39.0 )
AL_20171115_185522965_000000_00000001    61 stars filter C [  207.0s -   237.0s] expo= 30s elev=22.8deg humid= 32% sunelev=-30.5deg (moon at  77.0deg phase=0.17 elev=-39.0 )
AL_20171115_185603481_000000_00000001    61 stars filter C [  247.6s -   277.6s] expo= 30s elev=22.7deg humid= 33% sunelev=-30.6deg (moon at  77.0deg phase=0.17 elev=-39.0 )
AL_20171115_185643543_000000_00000001    60 stars filter C [  287.6s -   317.6s] expo= 30s elev=22.6deg humid= 33% sunelev=-30.7deg (moon at  77.0deg phase=0.17 elev=-40.0 )
AL_20171115_185724090_000000_00000001    64 stars filter C [  328.1s -   358.1s] expo= 30s elev=22.5deg humid= 33% sunelev=-30.8deg (moon at  77.0deg phase=0.17 elev=-40.0 )
AL_20171115_185803887_000000_00000001    61 stars filter C [  368.0s -   398.0s] expo= 30s elev=22.3deg humid= 33% sunelev=-30.9deg (moon at  77.0deg phase=0.17 elev=-40.0 )
AL_20171115_185944434_000000_00000001    71 stars filter C [  408.5s -   498.5s] expo= 90s elev=22.1deg humid= 34% sunelev=-31.1deg (moon at  77.0deg phase=0.17 elev=-40.0 )
AL_20171115_190125445_000000_00000001    67 stars filter C [  509.4s -   599.4s] expo= 90s elev=21.8deg humid= 34% sunelev=-31.4deg (moon at  77.0deg phase=0.17 elev=-40.0 )
AL_20171115_190306179_000000_00000001    67 stars filter C [  610.2s -   700.2s] expo= 90s elev=21.5deg humid= 34% sunelev=-31.7deg (moon at  77.0deg phase=0.17 elev=-40.0 )
AL_20171115_190446429_000000_00000001    67 stars filter C [  710.5s -   800.5s] expo= 90s elev=21.2deg humid= 34% sunelev=-32.0deg (moon at  77.0deg phase=0.17 elev=-41.0 )
AL_20171115_190626742_000000_00000001    69 stars filter C [  810.8s -   900.8s] expo= 90s elev=20.9deg humid= 34% sunelev=-32.3deg (moon at  77.0deg phase=0.17 elev=-41.0 )
AL_20171115_190806976_000000_00000001    68 stars filter C [  911.1s -  1001.1s] expo= 90s elev=20.6deg humid= 34% sunelev=-32.6deg (moon at  77.0deg phase=0.17 elev=-41.0 )
AL_20171115_190948226_000000_00000001    64 stars filter C [ 1012.3s -  1102.3s] expo= 90s elev=20.3deg humid= 33% sunelev=-32.9deg (moon at  77.0deg phase=0.17 elev=-41.0 )
AL_20171115_191128051_000000_00000001    71 stars filter C [ 1112.1s -  1202.1s] expo= 90s elev=20.0deg humid= 33% sunelev=-33.2deg (moon at  77.0deg phase=0.17 elev=-41.0 )
AL_20171115_191308535_000000_00000001    71 stars filter C [ 1212.6s -  1302.6s] expo= 90s elev=19.7deg humid= 33% sunelev=-33.5deg (moon at  77.0deg phase=0.17 elev=-42.0 )
AL_20171115_191449535_000000_00000001    67 stars filter C [ 1313.6s -  1403.6s] expo= 90s elev=19.4deg humid= 33% sunelev=-33.8deg (moon at  76.0deg phase=0.17 elev=-42.0 )
AL_20171115_191630082_000000_00000001    66 stars filter C [ 1414.1s -  1504.1s] expo= 90s elev=19.1deg humid= 33% sunelev=-34.1deg (moon at  76.0deg phase=0.17 elev=-42.0 )
AL_20171115_191810832_000000_00000001    68 stars filter C [ 1514.9s -  1604.9s] expo= 90s elev=18.8deg humid= 33% sunelev=-34.4deg (moon at  76.0deg phase=0.17 elev=-42.0 )
AL_20171115_191951067_000000_00000001    72 stars filter C [ 1615.1s -  1705.1s] expo= 90s elev=18.5deg humid= 33% sunelev=-34.7deg (moon at  76.0deg phase=0.17 elev=-42.0 )
AL_20171115_192301850_000000_00000001    67 stars filter C [ 1715.9s -  1895.9s] expo=180s elev=18.1deg humid= 33% sunelev=-35.0deg (moon at  76.0deg phase=0.17 elev=-43.0 )
AL_20171115_192612100_000000_00000001    59 stars filter C [ 1906.2s -  2086.2s] expo=180s elev=17.5deg humid= 34% sunelev=-35.5deg (moon at  76.0deg phase=0.17 elev=-43.0 )
AL_20171115_192922616_000000_00000001    77 stars filter C [ 2096.7s -  2276.7s] expo=180s elev=16.9deg humid= 34% sunelev=-36.1deg (moon at  76.0deg phase=0.17 elev=-44.0 )
AL_20171115_193232672_000000_00000001    68 stars filter C [ 2286.7s -  2466.7s] expo=180s elev=16.4deg humid= 34% sunelev=-36.7deg (moon at  76.0deg phase=0.17 elev=-44.0 )
AL_20171115_193543187_000000_00000001    67 stars filter C [ 2477.3s -  2657.3s] expo=180s elev=15.8deg humid= 34% sunelev=-37.2deg (moon at  76.0deg phase=0.17 elev=-44.0 )
AL_20171115_193853047_000000_00000001    67 stars filter C [ 2667.1s -  2847.1s] expo=180s elev=15.2deg humid= 33% sunelev=-37.8deg (moon at  76.0deg phase=0.17 elev=-45.0 )
AL_20171115_194203295_000000_00000001    59 stars filter C [ 2857.4s -  3037.4s] expo=180s elev=14.7deg humid= 32% sunelev=-38.4deg (moon at  76.0deg phase=0.17 elev=-45.0 )
AL_20171115_194513154_000000_00000001    72 stars filter C [ 3047.2s -  3227.2s] expo=180s elev=14.1deg humid= 32% sunelev=-38.9deg (moon at  76.0deg phase=0.17 elev=-45.0 )
AL_20171115_194823623_000000_00000001    64 stars filter C [ 3237.7s -  3417.7s] expo=180s elev=13.5deg humid= 32% sunelev=-39.5deg (moon at  76.0deg phase=0.17 elev=-46.0 )
AL_20171115_195134092_000000_00000001    61 stars filter C [ 3428.2s -  3608.2s] expo=180s elev=12.9deg humid= 32% sunelev=-40.0deg (moon at  76.0deg phase=0.17 elev=-46.0 )
AL_20171115_195444490_000000_00000001    67 stars filter C [ 3618.5s -  3798.5s] expo=180s elev=12.4deg humid= 32% sunelev=-40.6deg (moon at  76.0deg phase=0.17 elev=-46.0 )
AL_20171115_195755443_000000_00000001    56 stars filter C [ 3809.5s -  3989.5s] expo=180s elev=11.8deg humid= 32% sunelev=-41.2deg (moon at  76.0deg phase=0.17 elev=-47.0 )
AL_20171115_200105756_000000_00000001    69 stars filter C [ 3999.8s -  4179.8s] expo=180s elev=11.2deg humid= 32% sunelev=-41.7deg (moon at  76.0deg phase=0.17 elev=-47.0 )
AL_20171115_200416446_000000_00000001    60 stars filter C [ 4190.5s -  4370.5s] expo=180s elev=10.7deg humid= 32% sunelev=-42.3deg (moon at  76.0deg phase=0.17 elev=-47.0 )
AL_20171115_200726977_000000_00000001    62 stars filter C [ 4381.0s -  4561.0s] expo=180s elev=10.1deg humid= 32% sunelev=-42.8deg (moon at  76.0deg phase=0.17 elev=-48.0 )
AL_20171115_201037024_000000_00000001    60 stars filter C [ 4571.1s -  4751.1s] expo=180s elev= 9.5deg humid= 33% sunelev=-43.4deg (moon at  76.0deg phase=0.17 elev=-48.0 )
AL_20171115_201348112_000000_00000001    53 stars filter C [ 4762.1s -  4942.1s] expo=180s elev= 9.0deg humid= 34% sunelev=-43.9deg (moon at  76.0deg phase=0.17 elev=-48.0 )
AL_20171115_201658424_000000_00000001    61 stars filter C [ 4952.4s -  5132.4s] expo=180s elev= 8.4deg humid= 34% sunelev=-44.5deg (moon at  76.0deg phase=0.17 elev=-48.0 )
AL_20171115_202008909_000000_00000001    56 stars filter C [ 5142.9s -  5322.9s] expo=180s elev= 7.8deg humid= 35% sunelev=-45.0deg (moon at  76.0deg phase=0.17 elev=-49.0 )
AL_20171115_202320264_000000_00000001    49 stars filter C [ 5334.3s -  5514.3s] expo=180s elev= 7.3deg humid= 35% sunelev=-45.5deg (moon at  76.0deg phase=0.17 elev=-49.0 )
AL_20171115_202630795_000000_00000001    58 stars filter C [ 5524.8s -  5704.8s] expo=180s elev= 6.7deg humid= 34% sunelev=-46.1deg (moon at  76.0deg phase=0.17 elev=-49.0 )
AL_20171115_202941077_000000_00000001    48 stars filter C [ 5715.1s -  5895.1s] expo=180s elev= 6.1deg humid= 34% sunelev=-46.6deg (moon at  76.0deg phase=0.17 elev=-49.0 )
AL_20171115_203251601_000000_00000001    51 stars filter C [ 5905.6s -  6085.6s] expo=180s elev= 5.6deg humid= 35% sunelev=-47.1deg (moon at  76.0deg phase=0.17 elev=-49.0 )
AL_20171115_203601851_000000_00000001    37 stars filter C [ 6095.9s -  6275.9s] expo=180s elev= 5.0deg humid= 35% sunelev=-47.7deg (moon at  76.0deg phase=0.17 elev=-50.0 )
AL_20171115_203913069_000000_00000001    17 stars filter C [ 6287.1s -  6467.1s] expo=180s elev= 4.5deg humid= 35% sunelev=-48.2deg (moon at  76.0deg phase=0.17 elev=-50.0 )
AL_20171115_204223601_000000_00000001    27 stars filter C [ 6477.7s -  6657.7s] expo=180s elev= 3.9deg humid= 35% sunelev=-48.7deg (moon at  76.0deg phase=0.17 elev=-50.0 )
AL_20171115_204534109_000000_00000001    16 stars filter C [ 6668.2s -  6848.2s] expo=180s elev= 3.4deg humid= 35% sunelev=-49.2deg (moon at  76.0deg phase=0.17 elev=-50.0 )
AL_20171115_204844406_000000_00000001    19 stars filter C [ 6858.4s -  7038.4s] expo=180s elev= 2.8deg humid= 36% sunelev=-49.8deg (moon at  76.0deg phase=0.17 elev=-50.0 )
AL_20171115_205154687_000000_00000001     0 star  filter C [ 7048.7s -  7228.7s] expo=180s elev= 2.3deg humid= 36% sunelev=-50.3deg (moon at  76.0deg phase=0.17 elev=-51.0 )
AL_20171115_205504524_000000_00000001     0 star  filter C [ 7238.6s -  7418.6s] expo=180s elev= 1.8deg humid= 35% sunelev=-50.8deg (moon at  75.0deg phase=0.17 elev=-51.0 )
AL_20171115_205814790_000000_00000001     0 star  filter C [ 7428.8s -  7608.8s] expo=180s elev= 1.3deg humid= 35% sunelev=-51.3deg (moon at  75.0deg phase=0.17 elev=-51.0 )
AL_20171115_210125696_000000_00000001     0 star  filter C [ 7619.8s -  7799.8s] expo=180s elev= 0.8deg humid= 34% sunelev=-51.8deg (moon at  75.0deg phase=0.16 elev=-51.0 )
AL_20171115_210436987_000000_00000001     0 star  filter C [ 7811.0s -  7991.0s] expo=180s elev= 0.3deg humid= 35% sunelev=-52.3deg (moon at  75.0deg phase=0.16 elev=-51.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2458073.28565799 2017-11-15T18:51:20.850
Decoded useful notice informations.
RA(J2000.0) : 278.4125 18h33m39s0
DEC(J2000.0) : 9.1283 +09d07m41s88
Error radius : 3.0 arcmin

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=39.0946927686 lat=8.07475465995
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.234
Assuming Rv=3.1: Av=0.776 Ar=0.625 Ai=0.454
extmap.fit: Extinction map E(B-V) from Schlegel:

Field of View is about 59 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 171115: TAROT Calern observatory optical observations
----------------------------------------------------------------------
Klotz A., Noysena.K., Atteia J.L. (CNRS-OMP-IRAP),
Boer, M., Eymar, L. (CNRS-ARTEMIS),
Gendre B. (UVI - Etelman Obs.) report:

We imaged the field of GRB 171115 detected by SWIFT
(trigger 790053) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 133.5s after the GRB trigger
(12.4s after the notice). The elevation of the field decreased from
22 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2017-11-15T18:51:20.850

The first image is trailed with a duration of 60.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any OT with a limiting magnitude of:
t0+133.5s to t0+193.5s : R > 15.1

The second image is 30.0s exposure in tracking mode:
t0+207.0s to t0+237.0s : R > 16.2

We co-added a series of exposures:
t0+207.0s to t0+498.5s : 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 133.5s 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= 39.0947 lat= +8.0748
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.
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