GRB25_20170314_G277583 at TAROT Calern observatory

TAROT Calern observatory log of images

IM_20170314_215435184_000000_52962801    26 stars filter C [212356288350.0s - 212356288470.0s] expo=120s elev=56.1deg humid= 74% sunelev=-42.1deg (moon at  96.0deg phase=0.85 elev=+21.0 )
IM_20170314_215646668_000000_52962801    29 stars filter C [212356288481.4s - 212356288601.4s] expo=120s elev=55.7deg humid= 75% sunelev=-42.4deg (moon at  96.0deg phase=0.85 elev=+21.0 )
IM_20170315_000015167_000000_52962901    28 stars filter C [212356295889.9s - 212356296009.9s] expo=120s elev=33.6deg humid= 74% sunelev=-48.3deg (moon at  96.0deg phase=0.84 elev=+36.0 )
IM_20170315_000226120_000000_52962901    26 stars filter C [212356296020.9s - 212356296140.9s] expo=120s elev=33.2deg humid= 74% sunelev=-48.3deg (moon at  96.0deg phase=0.84 elev=+36.0 )
IM_20170315_215435167_000000_52971501    33 stars filter C [212356374750.0s - 212356374870.0s] expo=120s elev=55.4deg humid= 69% sunelev=-41.8deg (moon at 108.0deg phase=0.78 elev=+11.0 )
IM_20170315_215646620_000000_52971501    32 stars filter C [212356374881.4s - 212356375001.4s] expo=120s elev=55.0deg humid= 70% sunelev=-42.0deg (moon at 108.0deg phase=0.78 elev=+12.0 )
IM_20170316_000015109_000000_52971601    30 stars filter C [212356382289.9s - 212356382409.9s] expo=120s elev=32.9deg humid= 61% sunelev=-47.9deg (moon at 108.0deg phase=0.78 elev=+28.0 )
IM_20170316_000225872_000000_52971601    30 stars filter C [212356382420.7s - 212356382540.7s] expo=120s elev=32.5deg humid= 60% sunelev=-47.9deg (moon at 108.0deg phase=0.78 elev=+29.0 )
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=185.845111326 lat=17.3094389558
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.086
Assuming Rv=3.1: Av=0.284 Ar=0.229 Ai=0.166 Extinction map E(B-V) from Schlegel:

Field of View is about 66 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 25_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 25_201 detected by XXX
(trigger XXX) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 212356288350.0s 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+212356288350.0s to t0+212356288470.0s : R > 15.1

The second image is 120.0s exposure in tracking mode:
t0+212356288481.4s to t0+212356288601.4s : R > 16.2

We co-added a series of exposures:
t0+212356288481.4s to t0+212356382409.9s : 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 212356288350.0s 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=185.8451 lat=+17.3094
and the galactic extinction in R band is 0.2 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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