GRB8_20170315_G277583 at TAROT Calern observatory

TAROT Calern observatory log of images

IM_20170315_184845497_000000_52956801    66 stars filter C [212356363600.2s - 212356363720.2s] expo=120s elev=67.0deg humid= 72% sunelev=-13.3deg (moon at 119.0deg phase=0.79 elev=-19.0 )
IM_20170315_185056653_000000_52956801    77 stars filter C [212356363731.5s - 212356363851.5s] expo=120s elev=66.8deg humid= 72% sunelev=-13.7deg (moon at 119.0deg phase=0.79 elev=-19.0 )
IM_20170315_193705052_000000_52956901    68 stars filter C [212356366499.9s - 212356366619.9s] expo=120s elev=62.2deg humid= 71% sunelev=-21.7deg (moon at 119.0deg phase=0.79 elev=-11.0 )
IM_20170315_193915630_000000_52956901    81 stars filter C [212356366630.4s - 212356366750.4s] expo=120s elev=61.9deg humid= 71% sunelev=-22.1deg (moon at 119.0deg phase=0.79 elev=-10.0 )
IM_20170315_202525333_000000_52957001    78 stars filter C [212356369400.1s - 212356369520.1s] expo=120s elev=55.2deg humid= 65% sunelev=-29.6deg (moon at 119.0deg phase=0.79 elev= -3.0 )
IM_20170315_202737256_000000_52957001    84 stars filter C [212356369532.0s - 212356369652.0s] expo=120s elev=54.8deg humid= 66% sunelev=-30.0deg (moon at 120.0deg phase=0.79 elev= -2.0 )
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=189.34994094 lat=2.06423068924
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.987
Assuming Rv=3.1: Av=3.271 Ar=2.638 Ai=1.914 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 8_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 8_2017 detected by XXX
(trigger XXX) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 212356363600.2s after the GRB trigger
(XXXs after the notice). The elevation of the field decreased from
66 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+212356363600.2s to t0+212356363720.2s : R > 15.1

The second image is 120.0s exposure in tracking mode:
t0+212356363731.5s to t0+212356363851.5s : R > 16.2

We co-added a series of exposures:
t0+212356363731.5s to t0+212356369652.0s : 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 212356363600.2s 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=189.3499 lat= +2.0642
and the galactic extinction in R band is 2.6 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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