GRB4_20170315_G277583 at TAROT Calern observatory

TAROT Calern observatory log of images

IM_20170315_182924594_000000_52955601    38 stars filter C [212356362439.4s - 212356362559.4s] expo=120s elev=65.9deg humid= 73% sunelev=-9.8deg (moon at 122.0deg phase=0.79 elev=-22.0 )
IM_20170315_183136047_000000_52955601    41 stars filter C [212356362570.9s - 212356362690.9s] expo=120s elev=65.8deg humid= 73% sunelev=-10.2deg (moon at 122.0deg phase=0.79 elev=-22.0 )
IM_20170315_191745652_000000_52955701    83 stars filter C [212356365340.4s - 212356365460.4s] expo=120s elev=61.5deg humid= 72% sunelev=-18.4deg (moon at 123.0deg phase=0.79 elev=-14.0 )
IM_20170315_191957137_000000_52955701    83 stars filter C [212356365471.9s - 212356365591.9s] expo=120s elev=61.2deg humid= 73% sunelev=-18.8deg (moon at 123.0deg phase=0.79 elev=-14.0 )
IM_20170315_200604774_000000_52955801    86 stars filter C [212356368239.5s - 212356368359.5s] expo=120s elev=54.7deg humid= 69% sunelev=-26.5deg (moon at 123.0deg phase=0.79 elev= -6.0 )
IM_20170315_200815511_000000_52955801    82 stars filter C [212356368370.3s - 212356368490.3s] expo=120s elev=54.4deg humid= 69% sunelev=-26.9deg (moon at 123.0deg phase=0.79 elev= -5.0 )
No informations from GCN notice.

Other pages about TAROT Calern observatory observations

Status of this alert received by TAROT Calern observatory.
Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=188.611453256 lat=-1.87982135183
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=2.464
Assuming Rv=3.1: Av=8.168 Ar=6.586 Ai=4.780 Extinction map E(B-V) from Schlegel:

Field of View is about 56 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 4_2017: 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 4_2017 detected by XXX
(trigger XXX) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 212356362439.4s after the GRB trigger
(XXXs after the notice). The elevation of the field decreased from
65 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 1858-11-17T00:00:00.000

The first image is trailed with a duration of 120.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any OT with a limiting magnitude of:
t0+212356362439.4s to t0+212356362559.4s : R > 15.1

The second image is 120.0s exposure in tracking mode:
t0+212356362570.9s to t0+212356362690.9s : R > 16.2

We co-added a series of exposures:
t0+212356362570.9s to t0+212356368490.3s : R > 17.7
---- YES
We detect a new fading source in the error box given by XXX
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 212356362439.4s 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=188.6115 lat= -1.8798
and the galactic extinction in R band is 6.6 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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