GRB20_20170314_G277583 at TAROT Calern observatory

TAROT Calern observatory log of images

IM_20170314_213025172_000000_52961301    34 stars filter C [212356286900.0s - 212356287020.0s] expo=120s elev=54.7deg humid= 74% sunelev=-39.3deg (moon at  96.0deg phase=0.85 elev=+17.0 )
IM_20170314_213236023_000000_52961301    33 stars filter C [212356287030.8s - 212356287150.8s] expo=120s elev=54.4deg humid= 73% sunelev=-39.5deg (moon at  96.0deg phase=0.85 elev=+18.0 )
IM_20170314_233605240_000000_52961401    30 stars filter C [212356294440.0s - 212356294560.0s] expo=120s elev=32.4deg humid= 74% sunelev=-48.5deg (moon at  97.0deg phase=0.84 elev=+34.0 )
IM_20170314_233815771_000000_52961401    30 stars filter C [212356294570.5s - 212356294690.5s] expo=120s elev=32.0deg humid= 74% sunelev=-48.5deg (moon at  97.0deg phase=0.84 elev=+34.0 )
IM_20170315_213024726_000000_52970001    32 stars filter C [212356373299.5s - 212356373419.5s] expo=120s elev=54.1deg humid= 72% sunelev=-38.9deg (moon at 108.0deg phase=0.78 elev= +7.0 )
IM_20170315_213235070_000000_52970001    36 stars filter C [212356373429.8s - 212356373549.8s] expo=120s elev=53.7deg humid= 72% sunelev=-39.2deg (moon at 109.0deg phase=0.78 elev= +8.0 )
IM_20170315_233605194_000000_52970101    32 stars filter C [212356380840.0s - 212356380960.0s] expo=120s elev=31.7deg humid= 66% sunelev=-48.1deg (moon at 109.0deg phase=0.78 elev=+26.0 )
IM_20170315_233816866_000000_52970101    29 stars filter C [212356380971.7s - 212356381091.7s] expo=120s elev=31.3deg humid= 66% sunelev=-48.1deg (moon at 109.0deg 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=192.683102195 lat=13.2734229085
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.050
Assuming Rv=3.1: Av=0.165 Ar=0.133 Ai=0.096 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 20_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 20_201 detected by XXX
(trigger XXX) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 212356286900.0s after the GRB trigger
(XXXs after the notice). The elevation of the field decreased from
54 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+212356286900.0s to t0+212356287020.0s : R > 15.1

The second image is 120.0s exposure in tracking mode:
t0+212356287030.8s to t0+212356287150.8s : R > 16.2

We co-added a series of exposures:
t0+212356287030.8s to t0+212356380960.0s : 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 212356286900.0s 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=192.6831 lat=+13.2734
and the galactic extinction in R band is 0.1 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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