GRB150621_232754_INTEGRAL at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20150621_232918453_000000_00000001     0 star  filter C [   19.2s -    79.2s] expo= 60s elev=59.6deg humid= 90% sunelev=-22.8deg (moon at 131.0deg phase=0.35 elev=-12.0 )
AL_20150621_233003609_000000_00000001    62 stars filter C [   94.4s -   124.4s] expo= 30s elev=59.8deg humid= 90% sunelev=-22.8deg (moon at 131.0deg phase=0.35 elev=-13.0 )
AL_20150621_233027828_000000_00000001     0 star  filter C [  135.8s -   165.8s] expo= 30s elev=59.9deg humid= 89% sunelev=-22.8deg (moon at 131.0deg phase=0.35 elev=-13.0 )
AL_20150621_233811418_000003_46623701    82 stars filter C [  522.2s -   612.2s] expo= 90s elev=61.2deg humid= 88% sunelev=-22.8deg (moon at 131.0deg phase=0.35 elev=-14.0 )
AL_20150621_233951902_000003_46623701    78 stars filter C [  622.7s -   712.7s] expo= 90s elev=61.5deg humid= 88% sunelev=-22.8deg (moon at 131.0deg phase=0.35 elev=-14.0 )
AL_20150621_234132523_000003_46623701    86 stars filter C [  723.2s -   813.2s] expo= 90s elev=61.8deg humid= 87% sunelev=-22.8deg (moon at 131.0deg phase=0.35 elev=-14.0 )
AL_20150621_234326039_000003_46623801    86 stars filter C [  836.7s -   926.7s] expo= 90s elev=62.1deg humid= 87% sunelev=-22.8deg (moon at 131.0deg phase=0.35 elev=-15.0 )
AL_20150621_234506992_000003_46623801    84 stars filter C [  937.7s -  1027.7s] expo= 90s elev=62.4deg humid= 86% sunelev=-22.8deg (moon at 131.0deg phase=0.35 elev=-15.0 )
AL_20150621_234647539_000003_46623801    82 stars filter C [ 1038.2s -  1128.2s] expo= 90s elev=62.7deg humid= 86% sunelev=-22.8deg (moon at 131.0deg phase=0.35 elev=-15.0 )
AL_20150621_234839398_000003_46623901    82 stars filter C [ 1150.1s -  1240.1s] expo= 90s elev=63.0deg humid= 86% sunelev=-22.7deg (moon at 131.0deg phase=0.35 elev=-15.0 )
AL_20150621_235020632_000003_46623901    80 stars filter C [ 1251.3s -  1341.3s] expo= 90s elev=63.3deg humid= 85% sunelev=-22.7deg (moon at 131.0deg phase=0.35 elev=-16.0 )
AL_20150621_235200857_000003_46623901    80 stars filter C [ 1351.6s -  1441.6s] expo= 90s elev=63.6deg humid= 85% sunelev=-22.7deg (moon at 131.0deg phase=0.35 elev=-16.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457195.47771 2015-06-21T23:27:54.144
Decoded useful notice informations.
RA(J2000.0) : 306.040602709 20h24m09s7
DEC(J2000.0) : 33.856333973 +33d51m22s80
Error radius : 2.5 arcmin
Error box : x=65:158 y=55:148 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=73.1178598675 lat=-2.1702742354
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.508
Assuming Rv=3.1: Av=1.684 Ar=1.358 Ai=0.985
extmap.fit: 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
GRBlog
ROTSE last GRB images

Example of a GCNC email for this burst

gcncirc@capella.gsfc.nasa.gov
GRB 150621: TAROT Calern observatory optical observations
----------------------------------------------------------------------
Klotz A., Turpin D. (IRAP-CNRS-OMP),
Boer M., Gendre B., Siellez K., Dereli H., Bardho O. (UNS-CNRS-OCA),
Atteia J.L. (IRAP-CNRS-OMP) report:

We imaged the field of GRB 150621 detected by INTEGRAL
(trigger 7098) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 19.2s after the GRB trigger
(14.0s after the notice). The elevation of the field increased from
59 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2015-06-21T23:27:54.144

The first image is trailed with a duration of 60.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any OT with a limiting magnitude of:
t0+19.2s to t0+79.2s : R > 15.1

The second image is 30.0s exposure in tracking mode:
t0+94.4s to t0+124.4s : R > 16.2

We co-added a series of exposures:
t0+94.4s to t0+926.7s : R > 17.7
---- YES
We detect a new fading source in the error box given by INTEGRAL
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 19.2s 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= 73.1179 lat= -2.1703
and the galactic extinction in R band is 1.4 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.
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