GRB160917_113019_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20160917_183158484_000000_33284601    24 stars filter C [25114.1s - 25294.1s] expo=180s elev=79.7deg humid= 77% sunelev=-10.0deg (moon at  78.0deg phase=0.92 elev= +1.0 )
AL_20160917_183511359_000000_33284601    28 stars filter R [25306.9s - 25486.9s] expo=180s elev=80.2deg humid= 77% sunelev=-10.5deg (moon at  78.0deg phase=0.92 elev= +2.0 )
AL_20160917_183823968_000000_33284601    25 stars filter V [25499.5s - 25679.5s] expo=180s elev=80.8deg humid= 77% sunelev=-11.1deg (moon at  78.0deg phase=0.92 elev= +3.0 )
AL_20160917_185628101_000000_33284701    20 stars filter C [26583.6s - 26763.6s] expo=180s elev=83.7deg humid= 77% sunelev=-14.2deg (moon at  78.0deg phase=0.92 elev= +6.0 )
AL_20160917_185940719_000000_33284701    30 stars filter R [26776.2s - 26956.2s] expo=180s elev=84.2deg humid= 77% sunelev=-14.8deg (moon at  78.0deg phase=0.92 elev= +6.0 )
AL_20160917_190253328_000000_33284701    11 stars filter V [26968.9s - 27148.9s] expo=180s elev=84.7deg humid= 77% sunelev=-15.3deg (moon at  78.0deg phase=0.92 elev= +7.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457648.97939 2016-09-17T11:30:19.296
Decoded useful notice informations.
RA(J2000.0) : 295.668 19h42m40s3
DEC(J2000.0) : 46.4032 +46d24m11s51
Error radius : 4.0 arcsec
Error box : x=65:68 y=67:70 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=79.6566740396 lat=11.1924283941
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.158
Assuming Rv=3.1: Av=0.525 Ar=0.423 Ai=0.307
extmap.fit: Extinction map E(B-V) from Schlegel:

Field of View is about 61 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 160917: 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 160917 detected by SWIFT
(trigger 712505) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 6.98h after the GRB trigger.
The elevation of the field increased from
79 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2016-09-17T11:30:19.296

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+25114.1s to t0+25294.1s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+25306.9s to t0+25486.9s : R > 16.2

We co-added a series of exposures:
t0+25306.9s to t0+27148.9s : 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 6.98h 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= 79.6567 lat=+11.1924
and the galactic extinction in R band is 0.4 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.
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