GRB170604_213052_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20170605_002937269_000000_67398801     8 stars filter C [10539.7s - 10719.7s] expo=180s elev=48.4deg humid= 92% sunelev=-22.5deg (moon at  70.0deg phase=0.72 elev=+13.0 )
AL_20170605_003248566_000000_67398801    10 stars filter C [10730.9s - 10910.9s] expo=180s elev=48.0deg humid= 91% sunelev=-22.3deg (moon at  70.0deg phase=0.72 elev=+13.0 )
AL_20170605_003600643_000000_67398801    11 stars filter C [10923.0s - 11103.0s] expo=180s elev=47.7deg humid= 90% sunelev=-22.2deg (moon at  70.0deg phase=0.72 elev=+12.0 )
AL_20170605_003926502_000000_67398901    10 stars filter C [11128.8s - 11308.8s] expo=180s elev=47.3deg humid= 88% sunelev=-22.0deg (moon at  70.0deg phase=0.72 elev=+12.0 )
AL_20170605_004238471_000000_67398901    11 stars filter C [11320.8s - 11500.8s] expo=180s elev=47.0deg humid= 86% sunelev=-21.8deg (moon at  70.0deg phase=0.72 elev=+11.0 )
AL_20170605_004549555_000000_67398901    11 stars filter C [11512.0s - 11692.0s] expo=180s elev=46.6deg humid= 87% sunelev=-21.6deg (moon at  70.0deg phase=0.72 elev=+11.0 )
AL_20170605_004907117_000000_67399001    11 stars filter C [11709.4s - 11889.4s] expo=180s elev=46.3deg humid= 89% sunelev=-21.5deg (moon at  70.0deg phase=0.72 elev=+10.0 )
AL_20170605_005217883_000000_67399001    10 stars filter C [11900.2s - 12080.2s] expo=180s elev=45.9deg humid= 89% sunelev=-21.3deg (moon at  70.0deg phase=0.72 elev=+10.0 )
AL_20170605_005529314_000000_67399001    11 stars filter C [12091.6s - 12271.6s] expo=180s elev=45.6deg humid= 89% sunelev=-21.1deg (moon at  70.0deg phase=0.72 elev= +9.0 )
AL_20170605_005845408_000000_67399101    12 stars filter C [12287.7s - 12467.7s] expo=180s elev=45.2deg humid= 87% sunelev=-20.9deg (moon at  70.0deg phase=0.72 elev= +9.0 )
AL_20170605_010157095_000000_67399101    11 stars filter C [12479.4s - 12659.4s] expo=180s elev=44.9deg humid= 87% sunelev=-20.6deg (moon at  70.0deg phase=0.72 elev= +8.0 )
AL_20170605_010508056_000000_67399101    10 stars filter C [12670.4s - 12850.4s] expo=180s elev=44.5deg humid= 86% sunelev=-20.4deg (moon at  70.0deg phase=0.72 elev= +8.0 )
AL_20170605_010838540_000000_67399201    11 stars filter C [12880.8s - 13060.8s] expo=180s elev=44.2deg humid= 85% sunelev=-20.2deg (moon at  70.0deg phase=0.72 elev= +7.0 )
AL_20170605_011149509_000000_67399201    11 stars filter C [13071.8s - 13251.8s] expo=180s elev=43.8deg humid= 85% sunelev=-19.9deg (moon at  70.0deg phase=0.72 elev= +6.0 )
AL_20170605_011500078_000000_67399201    11 stars filter C [13262.3s - 13442.3s] expo=180s elev=43.5deg humid= 84% sunelev=-19.7deg (moon at  70.0deg phase=0.72 elev= +6.0 )
AL_20170605_023033880_000000_67399801    10 stars filter C [17796.2s - 17976.2s] expo=180s elev=35.8deg humid= 61% sunelev=-12.2deg (moon at  70.0deg phase=0.73 elev= -6.0 )
AL_20170605_023344817_000000_67399801     7 stars filter C [17987.2s - 18167.2s] expo=180s elev=35.5deg humid= 61% sunelev=-11.8deg (moon at  70.0deg phase=0.73 elev= -7.0 )
AL_20170605_023656107_000000_67399801     5 stars filter C [18178.4s - 18358.4s] expo=180s elev=35.2deg humid= 60% sunelev=-11.4deg (moon at  70.0deg phase=0.73 elev= -7.0 )
AL_20170605_025512257_000000_67399901     0 star  filter C [19274.6s - 19454.6s] expo=180s elev=33.4deg humid= 57% sunelev=-9.1deg (moon at  70.0deg phase=0.73 elev=-11.0 )
AL_20170605_025823682_000000_67399901     0 star  filter C [19466.0s - 19646.0s] expo=180s elev=33.1deg humid= 55% sunelev=-8.7deg (moon at  70.0deg phase=0.73 elev=-11.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457909.39644 2017-06-04T21:30:52.416
Decoded useful notice informations.
RA(J2000.0) : 200.8082 13h23m13s9
DEC(J2000.0) : 64.1979 +64d11m52s44
Error radius : 3.0 arcmin

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=117.247546568 lat=52.5780319386
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.022
Assuming Rv=3.1: Av=0.073 Ar=0.058 Ai=0.042 Extinction map E(B-V) from Schlegel:

Field of View is about 122 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 170604: 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 170604 detected by SWIFT
(trigger 755873) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 2.93h after the GRB trigger.
The elevation of the field decreased from
48 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2017-06-04T21:30:52.416

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+10539.7s to t0+10719.7s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+10730.9s to t0+10910.9s : R > 16.2

We co-added a series of exposures:
t0+10730.9s to t0+11889.4s : 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 2.93h 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=117.2475 lat=+52.5780
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.