GRB170604_190851_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20170605_015614185_000000_67367301     1 star  filter C [24258.1s - 24438.1s] expo=180s elev=13.4deg humid= 79% sunelev=-16.0deg (moon at 133.0deg phase=0.72 elev= +0.0 )
AL_20170605_015710529_000000_67367301     0 star  filter C [24449.1s - 24629.1s] expo=180s elev=13.9deg humid= 77% sunelev=-15.7deg (moon at 133.0deg phase=0.72 elev= -1.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457909.29781 2017-06-04T19:08:50.784
Decoded useful notice informations.
RA(J2000.0) : 342.6453 22h50m34s8
DEC(J2000.0) : -15.4143 -15d24m51s48
Error radius : 3.0 arcmin

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=49.388856251 lat=-59.6115300731
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.025
Assuming Rv=3.1: Av=0.082 Ar=0.066 Ai=0.048 Extinction map E(B-V) from Schlegel:

Field of View is about 149 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 755867) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 6.74h after the GRB trigger.
The elevation of the field increased from
13 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2017-06-04T19:08:50.784

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+24258.1s to t0+24438.1s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+24449.1s to t0+24629.1s : R > 16.2

We co-added a series of exposures:
t0+24449.1s to t0+24629.1s : 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 6.74h 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= 49.3889 lat=-59.6115
and the galactic extinction in R band is 0.1 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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