GRB160912_160743_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20160912_221032072_000000_32884601    12 stars filter C [21583.5s - 21763.5s] expo=180s elev=66.9deg humid= 69% sunelev=-39.1deg (moon at  74.0deg phase=0.72 elev=+22.0 )
AL_20160912_221344431_000000_32884601     7 stars filter R [21775.9s - 21955.9s] expo=180s elev=66.5deg humid= 68% sunelev=-39.4deg (moon at  74.0deg phase=0.72 elev=+22.0 )
AL_20160912_221656590_000000_32884601     3 stars filter V [21968.0s - 22148.0s] expo=180s elev=66.1deg humid= 68% sunelev=-39.6deg (moon at  74.0deg phase=0.72 elev=+22.0 )
AL_20160912_223459958_000000_32884701    30 stars filter C [23051.4s - 23231.4s] expo=180s elev=63.8deg humid= 68% sunelev=-40.8deg (moon at  74.0deg phase=0.72 elev=+20.0 )
AL_20160912_223813482_000000_32884701    22 stars filter R [23244.9s - 23424.9s] expo=180s elev=63.4deg humid= 68% sunelev=-41.0deg (moon at  74.0deg phase=0.72 elev=+20.0 )
AL_20160912_224125826_000000_32884701    17 stars filter V [23437.3s - 23617.3s] expo=180s elev=62.9deg humid= 68% sunelev=-41.2deg (moon at  74.0deg phase=0.72 elev=+19.0 )
AL_20160912_225938635_000000_32884801    24 stars filter C [24530.0s - 24710.0s] expo=180s elev=60.5deg humid= 73% sunelev=-41.9deg (moon at  74.0deg phase=0.72 elev=+17.0 )
AL_20160912_230250947_000000_32884801    23 stars filter R [24722.4s - 24902.4s] expo=180s elev=60.1deg humid= 74% sunelev=-42.0deg (moon at  74.0deg phase=0.72 elev=+17.0 )
AL_20160912_230603338_000000_32884801    19 stars filter V [24914.8s - 25094.8s] expo=180s elev=59.7deg humid= 75% sunelev=-42.1deg (moon at  74.0deg phase=0.72 elev=+16.0 )
AL_20160912_232409720_000000_32884901    31 stars filter C [26001.1s - 26181.1s] expo=180s elev=57.3deg humid= 75% sunelev=-42.4deg (moon at  74.0deg phase=0.72 elev=+14.0 )
AL_20160912_232722909_000000_32884901    23 stars filter R [26194.4s - 26374.4s] expo=180s elev=56.8deg humid= 76% sunelev=-42.4deg (moon at  74.0deg phase=0.72 elev=+14.0 )
AL_20160912_233035847_000000_32884901    19 stars filter V [26387.3s - 26567.3s] expo=180s elev=56.4deg humid= 76% sunelev=-42.4deg (moon at  74.0deg phase=0.72 elev=+13.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457644.17203 2016-09-12T16:07:43.392
Decoded useful notice informations.
RA(J2000.0) : 301.4975 20h05m59s3
DEC(J2000.0) : 57.5656 +57d33m56s16
Error radius : 1.8 arcsec
Error box : x=76:77 y=88:89 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=91.4176503088 lat=13.4121472684
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.207
Assuming Rv=3.1: Av=0.685 Ar=0.552 Ai=0.401 Extinction map E(B-V) from Schlegel:

Field of View is about 63 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 160912: 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 160912 detected by SWIFT
(trigger 711914) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 6.00h after the GRB trigger.
The elevation of the field decreased from
66 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2016-09-12T16:07:43.392

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+21583.5s to t0+21763.5s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+21775.9s to t0+21955.9s : R > 16.2

We co-added a series of exposures:
t0+21775.9s to t0+24710.0s : 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 6.00h 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= 91.4177 lat=+13.4121
and the galactic extinction in R band is 0.6 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.