GRB170524_194915_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20170524_200230663_000000_65506101     0 star  filter C [  700.3s -   790.3s] expo= 90s elev=12.5deg humid= 80% sunelev=-9.8deg (moon at  80.0deg phase=0.09 elev=-24.0 )
AL_20170524_200322710_000000_65506101     0 star  filter C [  801.7s -   891.7s] expo= 90s elev=12.6deg humid= 80% sunelev=-10.1deg (moon at  80.0deg phase=0.09 elev=-24.0 )
AL_20170524_200756094_000000_65506201    21 stars filter C [ 1025.6s -  1115.6s] expo= 90s elev=13.0deg humid= 80% sunelev=-10.6deg (moon at  80.0deg phase=0.09 elev=-25.0 )
AL_20170524_200937563_000000_65506201    22 stars filter C [ 1127.1s -  1217.1s] expo= 90s elev=13.1deg humid= 80% sunelev=-10.8deg (moon at  80.0deg phase=0.09 elev=-25.0 )
AL_20170524_201119188_000000_65506201    23 stars filter C [ 1228.8s -  1318.8s] expo= 90s elev=13.3deg humid= 80% sunelev=-11.0deg (moon at  80.0deg phase=0.09 elev=-25.0 )
AL_20170524_201305766_000000_65506301    25 stars filter C [ 1335.3s -  1425.3s] expo= 90s elev=13.5deg humid= 80% sunelev=-11.2deg (moon at  80.0deg phase=0.09 elev=-25.0 )
AL_20170524_201447188_000000_65506301    29 stars filter C [ 1436.7s -  1526.7s] expo= 90s elev=13.6deg humid= 80% sunelev=-11.5deg (moon at  80.0deg phase=0.09 elev=-25.0 )
AL_20170524_201627938_000000_65506301    28 stars filter C [ 1537.5s -  1627.5s] expo= 90s elev=13.8deg humid= 80% sunelev=-11.7deg (moon at  80.0deg phase=0.09 elev=-25.0 )
AL_20170524_202113561_000000_65506401    43 stars filter C [ 1733.1s -  1913.1s] expo=180s elev=14.2deg humid= 80% sunelev=-12.1deg (moon at  80.0deg phase=0.09 elev=-26.0 )
AL_20170524_202424811_000000_65506401    50 stars filter C [ 1924.3s -  2104.3s] expo=180s elev=14.5deg humid= 80% sunelev=-12.5deg (moon at  80.0deg phase=0.09 elev=-26.0 )
AL_20170524_202735568_000000_65506401    50 stars filter C [ 2115.1s -  2295.1s] expo=180s elev=14.9deg humid= 79% sunelev=-12.9deg (moon at  80.0deg phase=0.09 elev=-26.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457898.32587 2017-05-24T19:49:15.168
Decoded useful notice informations.
RA(J2000.0) : 319.4868 21h17m56s8
DEC(J2000.0) : 48.6064 +48d36m23s04
Error radius : 4.0 arcsec
Error box : x=2325:2327 y=603:605 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=90.8528172764 lat=-0.515628412165
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=1.829
Assuming Rv=3.1: Av=6.062 Ar=4.888 Ai=3.548 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 170524: 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 170524 detected by SWIFT
(trigger 754322) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 700.3s after the GRB trigger
(690.7s after the notice). The elevation of the field increased from
12 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2017-05-24T19:49:15.168

The first image is trailed with a duration of 90.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any OT with a limiting magnitude of:
t0+700.3s to t0+790.3s : R > 15.1

The second image is 90.0s exposure in tracking mode:
t0+801.7s to t0+891.7s : R > 16.2

We co-added a series of exposures:
t0+801.7s to t0+1526.7s : R > 17.7
---- YES
We detect a new fading source in the error box given by SWIFT
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 700.3s 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= 90.8528 lat= -0.5156
and the galactic extinction in R band is 4.9 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.