GRB170711_222025_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20170711_222206304_000000_00000001     0 star  filter C [   35.6s -    95.6s] expo= 60s elev=10.4deg humid=  0% sunelev=-22.0deg (moon at  96.0deg phase=0.83 elev=+14.0 )
AL_20170711_222249194_000000_00000001     7 stars filter C [  108.5s -   138.5s] expo= 30s elev=10.4deg humid=  0% sunelev=-22.0deg (moon at  96.0deg phase=0.83 elev=+15.0 )
AL_20170711_222329398_000000_00000001     9 stars filter C [  148.7s -   178.7s] expo= 30s elev=10.5deg humid=  0% sunelev=-22.1deg (moon at  96.0deg phase=0.83 elev=+15.0 )
AL_20170711_222409898_000000_00000001     9 stars filter C [  189.3s -   219.3s] expo= 30s elev=10.6deg humid=  0% sunelev=-22.1deg (moon at  96.0deg phase=0.83 elev=+15.0 )
AL_20170711_222450210_000000_00000001    12 stars filter C [  229.5s -   259.5s] expo= 30s elev=10.6deg humid=  0% sunelev=-22.2deg (moon at  96.0deg phase=0.83 elev=+15.0 )
AL_20170711_222501273_000000_00000001     0 star  filter C [  269.8s -   299.8s] expo= 30s elev=10.7deg humid=  0% sunelev=-22.2deg (moon at  96.0deg phase=0.83 elev=+15.0 )
AL_20170711_224444497_000003_73082701    20 stars filter C [ 1363.9s -  1453.9s] expo= 90s elev=12.4deg humid=  0% sunelev=-23.1deg (moon at  95.0deg phase=0.82 elev=+17.0 )
AL_20170711_224625512_000003_73082701    22 stars filter C [ 1464.9s -  1554.9s] expo= 90s elev=12.6deg humid=  0% sunelev=-23.2deg (moon at  95.0deg phase=0.82 elev=+18.0 )
AL_20170711_224806465_000003_73082701    22 stars filter C [ 1565.8s -  1655.8s] expo= 90s elev=12.8deg humid=  0% sunelev=-23.2deg (moon at  95.0deg phase=0.82 elev=+18.0 )
AL_20170711_225235869_000003_73082801    30 stars filter C [ 1745.2s -  1925.2s] expo=180s elev=13.1deg humid=  0% sunelev=-23.3deg (moon at  95.0deg phase=0.82 elev=+18.0 )
AL_20170711_225546212_000003_73082801    29 stars filter C [ 1935.5s -  2115.5s] expo=180s elev=13.5deg humid=  0% sunelev=-23.5deg (moon at  95.0deg phase=0.82 elev=+19.0 )
AL_20170711_225857150_000003_73082801    37 stars filter C [ 2126.5s -  2306.5s] expo=180s elev=13.8deg humid=  0% sunelev=-23.6deg (moon at  95.0deg phase=0.82 elev=+19.0 )
AL_20170711_230211369_000003_73082901    35 stars filter C [ 2320.7s -  2500.7s] expo=180s elev=14.1deg humid=  0% sunelev=-23.7deg (moon at  95.0deg phase=0.82 elev=+20.0 )
AL_20170711_230522154_000003_73082901    41 stars filter C [ 2511.5s -  2691.5s] expo=180s elev=14.4deg humid=  0% sunelev=-23.8deg (moon at  95.0deg phase=0.82 elev=+20.0 )
AL_20170711_230832388_000003_73082901    39 stars filter C [ 2701.8s -  2881.8s] expo=180s elev=14.8deg humid=  0% sunelev=-23.8deg (moon at  95.0deg phase=0.82 elev=+20.0 )
AL_20170711_231159638_000000_73975101    35 stars filter C [ 2909.0s -  3089.0s] expo=180s elev=15.1deg humid=  0% sunelev=-23.9deg (moon at  95.0deg phase=0.82 elev=+21.0 )
AL_20170711_231510142_000000_73975101    42 stars filter C [ 3099.5s -  3279.5s] expo=180s elev=15.5deg humid=  0% sunelev=-24.0deg (moon at  95.0deg phase=0.82 elev=+21.0 )
AL_20170711_231820673_000000_73975101    40 stars filter C [ 3290.0s -  3470.0s] expo=180s elev=15.8deg humid=  0% sunelev=-24.1deg (moon at  95.0deg phase=0.82 elev=+21.0 )
AL_20170711_232144392_000000_73975201    46 stars filter C [ 3493.8s -  3673.8s] expo=180s elev=16.2deg humid=  0% sunelev=-24.1deg (moon at  95.0deg phase=0.82 elev=+22.0 )
AL_20170711_232454910_000000_73975201    42 stars filter C [ 3684.3s -  3864.3s] expo=180s elev=16.5deg humid=  0% sunelev=-24.2deg (moon at  95.0deg phase=0.82 elev=+22.0 )
AL_20170711_232805895_000000_73975201    39 stars filter C [ 3875.3s -  4055.3s] expo=180s elev=16.9deg humid=  0% sunelev=-24.2deg (moon at  95.0deg phase=0.82 elev=+23.0 )
AL_20170711_233128067_000000_73975301    45 stars filter C [ 4077.4s -  4257.4s] expo=180s elev=17.3deg humid=  0% sunelev=-24.2deg (moon at  95.0deg phase=0.82 elev=+23.0 )
AL_20170711_233438980_000000_73975301    42 stars filter C [ 4268.3s -  4448.3s] expo=180s elev=17.6deg humid=  0% sunelev=-24.2deg (moon at  95.0deg phase=0.82 elev=+23.0 )
AL_20170711_233749308_000000_73975301    44 stars filter C [ 4458.6s -  4638.6s] expo=180s elev=18.0deg humid=  0% sunelev=-24.2deg (moon at  95.0deg phase=0.82 elev=+24.0 )
AL_20170711_234111901_000000_73975401    40 stars filter C [ 4661.2s -  4841.2s] expo=180s elev=18.4deg humid=  0% sunelev=-24.2deg (moon at  95.0deg phase=0.82 elev=+24.0 )
AL_20170711_234422377_000000_73975401    39 stars filter C [ 4851.7s -  5031.7s] expo=180s elev=18.8deg humid=  0% sunelev=-24.2deg (moon at  95.0deg phase=0.82 elev=+24.0 )
AL_20170711_234733174_000000_73975401    41 stars filter C [ 5042.5s -  5222.5s] expo=180s elev=19.1deg humid=  0% sunelev=-24.2deg (moon at  95.0deg phase=0.82 elev=+25.0 )
AL_20170711_235056158_000000_73975501    41 stars filter C [ 5245.5s -  5425.5s] expo=180s elev=19.5deg humid=  0% sunelev=-24.2deg (moon at  95.0deg phase=0.82 elev=+25.0 )
AL_20170711_235406458_000000_73975501    46 stars filter C [ 5435.8s -  5615.8s] expo=180s elev=19.9deg humid=  0% sunelev=-24.2deg (moon at  95.0deg phase=0.82 elev=+25.0 )
AL_20170711_235717958_000000_73975501    42 stars filter C [ 5627.3s -  5807.3s] expo=180s elev=20.3deg humid=  0% sunelev=-24.1deg (moon at  95.0deg phase=0.82 elev=+25.0 )
AL_20170712_000040536_000000_73975601    40 stars filter C [ 5829.8s -  6009.8s] expo=180s elev=20.7deg humid=  0% sunelev=-24.1deg (moon at  95.0deg phase=0.82 elev=+26.0 )
AL_20170712_000351059_000000_73975601    45 stars filter C [ 6020.4s -  6200.4s] expo=180s elev=21.1deg humid=  0% sunelev=-24.0deg (moon at  95.0deg phase=0.82 elev=+26.0 )
AL_20170712_000702481_000000_73975601    42 stars filter C [ 6211.8s -  6391.8s] expo=180s elev=21.5deg humid=  0% sunelev=-24.0deg (moon at  95.0deg phase=0.82 elev=+26.0 )
AL_20170712_001024106_000000_73975701    42 stars filter C [ 6413.5s -  6593.5s] expo=180s elev=21.9deg humid=  0% sunelev=-23.9deg (moon at  95.0deg phase=0.82 elev=+27.0 )
AL_20170712_001334684_000000_73975701    46 stars filter C [ 6604.0s -  6784.0s] expo=180s elev=22.3deg humid=  0% sunelev=-23.8deg (moon at  95.0deg phase=0.82 elev=+27.0 )
AL_20170712_001645408_000000_73975701    48 stars filter C [ 6794.7s -  6974.7s] expo=180s elev=22.7deg humid=  0% sunelev=-23.7deg (moon at  95.0deg phase=0.82 elev=+27.0 )
AL_20170712_002007939_000000_73975801    46 stars filter C [ 6997.3s -  7177.3s] expo=180s elev=23.2deg humid=  0% sunelev=-23.6deg (moon at  95.0deg phase=0.82 elev=+27.0 )
AL_20170712_002318220_000000_73975801    44 stars filter C [ 7187.6s -  7367.6s] expo=180s elev=23.6deg humid=  0% sunelev=-23.5deg (moon at  95.0deg phase=0.82 elev=+28.0 )
AL_20170712_002628727_000000_73975801    49 stars filter C [ 7378.1s -  7558.1s] expo=180s elev=24.0deg humid=  0% sunelev=-23.4deg (moon at  95.0deg phase=0.82 elev=+28.0 )
AL_20170712_002951539_000000_73975901    47 stars filter C [ 7580.9s -  7760.9s] expo=180s elev=24.4deg humid=  0% sunelev=-23.3deg (moon at  95.0deg phase=0.82 elev=+28.0 )
AL_20170712_003302289_000000_73975901    47 stars filter C [ 7771.7s -  7951.7s] expo=180s elev=24.8deg humid=  0% sunelev=-23.1deg (moon at  95.0deg phase=0.82 elev=+28.0 )
AL_20170712_003613742_000000_73975901    48 stars filter C [ 7963.1s -  8143.1s] expo=180s elev=25.2deg humid=  0% sunelev=-23.0deg (moon at  95.0deg phase=0.82 elev=+29.0 )
AL_20170712_003935180_000000_73976001    46 stars filter C [ 8164.5s -  8344.5s] expo=180s elev=25.7deg humid=  0% sunelev=-22.8deg (moon at  95.0deg phase=0.82 elev=+29.0 )
AL_20170712_004245477_000000_73976001    48 stars filter C [ 8354.8s -  8534.8s] expo=180s elev=26.1deg humid=  0% sunelev=-22.7deg (moon at  95.0deg phase=0.82 elev=+29.0 )
AL_20170712_004556010_000000_73976001    48 stars filter C [ 8545.3s -  8725.3s] expo=180s elev=26.5deg humid=  0% sunelev=-22.5deg (moon at  95.0deg phase=0.82 elev=+29.0 )
AL_20170712_004919244_000000_73976101    52 stars filter C [ 8748.6s -  8928.6s] expo=180s elev=27.0deg humid=  0% sunelev=-22.4deg (moon at  95.0deg phase=0.82 elev=+29.0 )
AL_20170712_005229557_000000_73976101    53 stars filter C [ 8938.9s -  9118.9s] expo=180s elev=27.4deg humid=  0% sunelev=-22.2deg (moon at  95.0deg phase=0.82 elev=+29.0 )
AL_20170712_005540063_000000_73976101    47 stars filter C [ 9129.4s -  9309.4s] expo=180s elev=27.8deg humid=  0% sunelev=-22.0deg (moon at  95.0deg phase=0.82 elev=+30.0 )
AL_20170712_005903797_000000_73976201    48 stars filter C [ 9333.1s -  9513.1s] expo=180s elev=28.3deg humid=  0% sunelev=-21.8deg (moon at  95.0deg phase=0.82 elev=+30.0 )
AL_20170712_010214047_000000_73976201    53 stars filter C [ 9523.4s -  9703.4s] expo=180s elev=28.7deg humid=  0% sunelev=-21.6deg (moon at  95.0deg phase=0.82 elev=+30.0 )
AL_20170712_010524846_000000_73976201    50 stars filter C [ 9714.2s -  9894.2s] expo=180s elev=29.2deg humid=  0% sunelev=-21.4deg (moon at  95.0deg phase=0.82 elev=+30.0 )
AL_20170712_010847424_000000_73976301    50 stars filter C [ 9916.8s - 10096.8s] expo=180s elev=29.7deg humid=  0% sunelev=-21.2deg (moon at  95.0deg phase=0.82 elev=+30.0 )
AL_20170712_011158206_000000_73976301    48 stars filter C [10107.5s - 10287.5s] expo=180s elev=30.1deg humid=  0% sunelev=-20.9deg (moon at  95.0deg phase=0.82 elev=+30.0 )
AL_20170712_011508924_000000_73976301    52 stars filter C [10298.3s - 10478.3s] expo=180s elev=30.5deg humid=  0% sunelev=-20.7deg (moon at  95.0deg phase=0.82 elev=+30.0 )
AL_20170712_011831518_000000_73976401    51 stars filter C [10500.8s - 10680.8s] expo=180s elev=31.0deg humid=  0% sunelev=-20.5deg (moon at  95.0deg phase=0.82 elev=+31.0 )
AL_20170712_012142003_000000_73976401    55 stars filter C [10691.4s - 10871.4s] expo=180s elev=31.5deg humid=  0% sunelev=-20.2deg (moon at  95.0deg phase=0.82 elev=+31.0 )
AL_20170712_012452737_000000_73976401    51 stars filter C [10882.1s - 11062.1s] expo=180s elev=31.9deg humid=  0% sunelev=-20.0deg (moon at  95.0deg phase=0.82 elev=+31.0 )
AL_20170712_012815614_000000_73976501    49 stars filter C [11084.9s - 11264.9s] expo=180s elev=32.4deg humid=  0% sunelev=-19.7deg (moon at  95.0deg phase=0.82 elev=+31.0 )
AL_20170712_013126598_000000_73976501    49 stars filter C [11275.9s - 11455.9s] expo=180s elev=32.9deg humid=  0% sunelev=-19.5deg (moon at  95.0deg phase=0.82 elev=+31.0 )
AL_20170712_013437130_000000_73976501    50 stars filter C [11466.4s - 11646.4s] expo=180s elev=33.3deg humid=  0% sunelev=-19.2deg (moon at  95.0deg phase=0.82 elev=+31.0 )
AL_20170712_013759685_000000_73976601    55 stars filter C [11669.0s - 11849.0s] expo=180s elev=33.8deg humid=  0% sunelev=-18.9deg (moon at  95.0deg phase=0.82 elev=+31.0 )
AL_20170712_014110654_000000_73976601    50 stars filter C [11860.0s - 12040.0s] expo=180s elev=34.3deg humid=  0% sunelev=-18.6deg (moon at  95.0deg phase=0.82 elev=+31.0 )
AL_20170712_014421170_000000_73976601    50 stars filter C [12050.5s - 12230.5s] expo=180s elev=34.7deg humid=  0% sunelev=-18.3deg (moon at  94.0deg phase=0.82 elev=+31.0 )
AL_20170712_014743948_000000_73976701    52 stars filter C [12253.3s - 12433.3s] expo=180s elev=35.2deg humid=  0% sunelev=-18.0deg (moon at  94.0deg phase=0.82 elev=+31.0 )
AL_20170712_015054948_000000_73976701    52 stars filter C [12444.3s - 12624.3s] expo=180s elev=35.7deg humid=  0% sunelev=-17.7deg (moon at  94.0deg phase=0.82 elev=+31.0 )
AL_20170712_015405448_000000_73976701    51 stars filter C [12634.8s - 12814.8s] expo=180s elev=36.2deg humid=  0% sunelev=-17.4deg (moon at  94.0deg phase=0.82 elev=+31.0 )
AL_20170712_015728256_000000_73976801    55 stars filter C [12837.6s - 13017.6s] expo=180s elev=36.7deg humid=  0% sunelev=-17.1deg (moon at  94.0deg phase=0.82 elev=+31.0 )
AL_20170712_020039006_000000_73976801    50 stars filter C [13028.4s - 13208.4s] expo=180s elev=37.2deg humid=  0% sunelev=-16.8deg (moon at  94.0deg phase=0.82 elev=+31.0 )
AL_20170712_020349522_000000_73976801    52 stars filter C [13218.9s - 13398.9s] expo=180s elev=37.6deg humid=  0% sunelev=-16.4deg (moon at  94.0deg phase=0.82 elev=+31.0 )
AL_20170712_021140331_000000_73977001    53 stars filter C [13689.7s - 13869.7s] expo=180s elev=38.8deg humid=  0% sunelev=-15.6deg (moon at  94.0deg phase=0.82 elev=+31.0 )
AL_20170712_021451144_000000_73977001    53 stars filter C [13880.5s - 14060.5s] expo=180s elev=39.3deg humid=  0% sunelev=-15.3deg (moon at  94.0deg phase=0.82 elev=+31.0 )
AL_20170712_021801589_000000_73977001    49 stars filter C [14071.0s - 14251.0s] expo=180s elev=39.8deg humid=  0% sunelev=-14.9deg (moon at  94.0deg phase=0.82 elev=+31.0 )
AL_20170712_022125667_000000_73977101    53 stars filter C [14274.9s - 14454.9s] expo=180s elev=40.3deg humid=  0% sunelev=-14.6deg (moon at  94.0deg phase=0.82 elev=+31.0 )
AL_20170712_022436589_000000_73977101    49 stars filter C [14465.9s - 14645.9s] expo=180s elev=40.8deg humid=  0% sunelev=-14.2deg (moon at  94.0deg phase=0.82 elev=+31.0 )
AL_20170712_022502432_000000_73977101     0 star  filter C [14656.4s - 14836.4s] expo=180s elev=41.3deg humid=  0% sunelev=-13.8deg (moon at  94.0deg phase=0.82 elev=+31.0 )
AL_20170712_025505959_000000_73977301     0 star  filter C [16295.3s - 16475.3s] expo=180s elev=45.5deg humid=  0% sunelev=-10.5deg (moon at  94.0deg phase=0.82 elev=+30.0 )
AL_20170712_025816488_000000_73977301     0 star  filter C [16485.8s - 16665.8s] expo=180s elev=46.0deg humid=  0% sunelev=-10.1deg (moon at  94.0deg phase=0.82 elev=+29.0 )
AL_20170712_030126972_000000_73977301     0 star  filter C [16676.3s - 16856.3s] expo=180s elev=46.5deg humid=  0% sunelev=-9.7deg (moon at  94.0deg phase=0.82 elev=+29.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457946.43085 2017-07-11T22:20:25.440
Decoded useful notice informations.
RA(J2000.0) : 45.8016 03h03m12s3
DEC(J2000.0) : 47.8487 +47d50m55s32
Error radius : 1.8 arcsec
Error box : x=52:53 y=62:63 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=144.630971318 lat=-9.39515950447
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.330
Assuming Rv=3.1: Av=1.093 Ar=0.882 Ai=0.640
extmap.fit: Extinction map E(B-V) from Schlegel:

Field of View is about 60 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 170711: 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 170711 detected by SWIFT
(trigger 761622) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 35.6s after the GRB trigger
(15.7s 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 = 2017-07-11T22:20:25.440

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+35.6s to t0+95.6s : R > 15.1

The second image is 30.0s exposure in tracking mode:
t0+108.5s to t0+138.5s : R > 16.2

We co-added a series of exposures:
t0+108.5s to t0+1453.9s : 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 35.6s 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=144.6310 lat= -9.3952
and the galactic extinction in R band is 0.9 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.
======================================================================