GRB7_20170315_G277583 at TAROT Calern observatory

TAROT Calern observatory log of images

IM_20170315_184355396_000000_52956501   118 stars filter C [212356363310.2s - 212356363430.2s] expo=120s elev=68.8deg humid= 73% sunelev=-12.4deg (moon at 121.0deg phase=0.79 elev=-20.0 )
IM_20170315_184606840_000000_52956501    85 stars filter C [212356363441.7s - 212356363561.7s] expo=120s elev=68.6deg humid= 73% sunelev=-12.8deg (moon at 121.0deg phase=0.79 elev=-20.0 )
IM_20170315_193215242_000000_52956601   126 stars filter C [212356366210.1s - 212356366330.1s] expo=120s elev=63.4deg humid= 72% sunelev=-20.9deg (moon at 121.0deg phase=0.79 elev=-12.0 )
IM_20170315_193425789_000000_52956601   113 stars filter C [212356366340.6s - 212356366460.6s] expo=120s elev=63.1deg humid= 72% sunelev=-21.3deg (moon at 121.0deg phase=0.79 elev=-11.0 )
IM_20170315_202035005_000000_52956701   137 stars filter C [212356369109.8s - 212356369229.8s] expo=120s elev=56.0deg humid= 65% sunelev=-28.9deg (moon at 121.0deg phase=0.79 elev= -3.0 )
IM_20170315_202245333_000000_52956701   124 stars filter C [212356369240.1s - 212356369360.1s] expo=120s elev=55.6deg humid= 65% sunelev=-29.2deg (moon at 122.0deg phase=0.79 elev= -3.0 )
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=186.348975115 lat=1.23524518204
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.816
Assuming Rv=3.1: Av=2.704 Ar=2.180 Ai=1.582 Extinction map E(B-V) from Schlegel:

Field of View is about 55 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 7_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 7_2017 detected by XXX
(trigger XXX) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 212356363310.2s after the GRB trigger
(XXXs after the notice). The elevation of the field decreased from
68 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+212356363310.2s to t0+212356363430.2s : R > 15.1

The second image is 120.0s exposure in tracking mode:
t0+212356363441.7s to t0+212356363561.7s : R > 16.2

We co-added a series of exposures:
t0+212356363441.7s to t0+212356369360.1s : 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 212356363310.2s 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=186.3490 lat= +1.2352
and the galactic extinction in R band is 2.2 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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