GRB21_20170314_G277583 at TAROT Calern observatory

TAROT Calern observatory log of images

IM_20170314_213515257_000000_52961601    50 stars filter C [212356287190.1s - 212356287310.1s] expo=120s elev=56.1deg humid= 73% sunelev=-39.9deg (moon at  97.0deg phase=0.85 elev=+18.0 )
IM_20170314_213726242_000000_52961601    44 stars filter C [212356287321.0s - 212356287441.0s] expo=120s elev=55.7deg humid= 73% sunelev=-40.1deg (moon at  97.0deg phase=0.85 elev=+18.0 )
IM_20170314_234054974_000000_52961701    42 stars filter C [212356294729.8s - 212356294849.8s] expo=120s elev=33.5deg humid= 74% sunelev=-48.5deg (moon at  98.0deg phase=0.84 elev=+34.0 )
IM_20170314_234306209_000000_52961701    42 stars filter C [212356294861.0s - 212356294981.0s] expo=120s elev=33.1deg humid= 75% sunelev=-48.5deg (moon at  98.0deg phase=0.84 elev=+35.0 )
IM_20170315_213514789_000000_52970301    45 stars filter C [212356373589.6s - 212356373709.6s] expo=120s elev=55.4deg humid= 72% sunelev=-39.5deg (moon at 110.0deg phase=0.78 elev= +8.0 )
IM_20170315_213726211_000000_52970301    50 stars filter C [212356373721.0s - 212356373841.0s] expo=120s elev=55.0deg humid= 71% sunelev=-39.8deg (moon at 110.0deg phase=0.78 elev= +9.0 )
IM_20170315_234055221_000000_52970401    42 stars filter C [212356381130.0s - 212356381250.0s] expo=120s elev=32.8deg humid= 64% sunelev=-48.1deg (moon at 110.0deg phase=0.78 elev=+26.0 )
IM_20170315_234306643_000000_52970401    44 stars filter C [212356381261.5s - 212356381381.5s] expo=120s elev=32.4deg humid= 63% sunelev=-48.1deg (moon at 110.0deg phase=0.78 elev=+26.0 )
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=187.983879813 lat=14.1878587708
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.076
Assuming Rv=3.1: Av=0.252 Ar=0.203 Ai=0.148 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 21_201: 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 21_201 detected by XXX
(trigger XXX) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 212356287190.1s after the GRB trigger
(XXXs after the notice). The elevation of the field decreased from
56 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+212356287190.1s to t0+212356287310.1s : R > 15.1

The second image is 120.0s exposure in tracking mode:
t0+212356287321.0s to t0+212356287441.0s : R > 16.2

We co-added a series of exposures:
t0+212356287321.0s to t0+212356381250.0s : 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 212356287190.1s 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=187.9839 lat=+14.1879
and the galactic extinction in R band is 0.2 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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