GRB160712_195336_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20160712_235641030_000000_26772601    17 stars filter C [14399.7s - 14579.7s] expo=180s elev=19.0deg humid= 69% sunelev=-24.3deg (moon at  89.0deg phase=0.56 elev= -4.0 )
AL_20160712_235952452_000000_26772601    15 stars filter C [14591.2s - 14771.2s] expo=180s elev=19.1deg humid= 68% sunelev=-24.3deg (moon at  89.0deg phase=0.56 elev= -4.0 )
AL_20160713_000303905_000000_26772601    10 stars filter R [14782.6s - 14962.6s] expo=180s elev=19.2deg humid= 68% sunelev=-24.2deg (moon at  89.0deg phase=0.56 elev= -5.0 )
AL_20160713_000628295_000000_26772701    14 stars filter C [14987.0s - 15167.0s] expo=180s elev=19.2deg humid= 68% sunelev=-24.1deg (moon at  89.0deg phase=0.56 elev= -5.0 )
AL_20160713_000939530_000000_26772701    14 stars filter C [15178.2s - 15358.2s] expo=180s elev=19.3deg humid= 68% sunelev=-24.1deg (moon at  89.0deg phase=0.56 elev= -6.0 )
AL_20160713_001251186_000000_26772701    11 stars filter R [15369.9s - 15549.9s] expo=180s elev=19.3deg humid= 68% sunelev=-24.0deg (moon at  89.0deg phase=0.56 elev= -7.0 )
AL_20160713_005253832_000000_26772901    15 stars filter C [17772.5s - 17952.5s] expo=180s elev=19.1deg humid= 66% sunelev=-22.3deg (moon at  89.0deg phase=0.56 elev=-14.0 )
AL_20160713_005604723_000000_26772901    11 stars filter R [17963.5s - 18143.5s] expo=180s elev=19.0deg humid= 66% sunelev=-22.2deg (moon at  89.0deg phase=0.56 elev=-14.0 )
AL_20160713_005916208_000000_26772901     6 stars filter V [18155.0s - 18335.0s] expo=180s elev=19.0deg humid= 66% sunelev=-22.0deg (moon at  89.0deg phase=0.56 elev=-15.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457582.32889 2016-07-12T19:53:36.096
Decoded useful notice informations.
RA(J2000.0) : 304.1598 20h16m38s3
DEC(J2000.0) : -26.9584 -26d57m30s23
Error radius : 2.9 arcsec
Error box : x=53:55 y=88:90 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=15.7813313855 lat=-29.659535835
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.257
Assuming Rv=3.1: Av=0.852 Ar=0.687 Ai=0.499 Extinction map E(B-V) from Schlegel:

Field of View is about 77 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 160712: 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 160712 detected by SWIFT
(trigger 704155) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 4.00h after the GRB trigger.
The elevation of the field increased from
19 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2016-07-12T19:53:36.096

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+14399.7s to t0+14579.7s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+14591.2s to t0+14771.2s : R > 16.2

We co-added a series of exposures:
t0+14591.2s to t0+17952.5s : 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 4.00h 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= 15.7813 lat=-29.6595
and the galactic extinction in R band is 0.7 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.