GRB150624_204732_INTEGRAL at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20150624_204855723_000000_00000001     0 star  filter C [   18.9s -    78.9s] expo= 60s elev=33.1deg humid= 51% sunelev=-12.8deg (moon at 116.0deg phase=0.52 elev=+27.0 )
AL_20150624_204940645_000000_00000001    50 stars filter C [   93.8s -   123.8s] expo= 30s elev=33.3deg humid= 51% sunelev=-13.0deg (moon at 116.0deg phase=0.52 elev=+27.0 )
AL_20150624_205021426_000000_00000001    51 stars filter C [  134.6s -   164.6s] expo= 30s elev=33.4deg humid= 51% sunelev=-13.0deg (moon at 116.0deg phase=0.52 elev=+27.0 )
AL_20150624_205102192_000000_00000001    50 stars filter C [  175.3s -   205.3s] expo= 30s elev=33.5deg humid= 51% sunelev=-13.1deg (moon at 116.0deg phase=0.52 elev=+27.0 )
AL_20150624_205143864_000000_00000001    51 stars filter C [  217.0s -   247.0s] expo= 30s elev=33.6deg humid= 51% sunelev=-13.2deg (moon at 116.0deg phase=0.52 elev=+27.0 )
AL_20150624_205224520_000000_00000001    51 stars filter C [  257.7s -   287.7s] expo= 30s elev=33.7deg humid= 51% sunelev=-13.3deg (moon at 116.0deg phase=0.52 elev=+27.0 )
AL_20150624_205405357_000000_00000001    66 stars filter C [  298.5s -   388.5s] expo= 90s elev=33.9deg humid= 51% sunelev=-13.3deg (moon at 116.0deg phase=0.52 elev=+26.0 )
AL_20150624_205546779_000000_00000001    68 stars filter C [  399.9s -   489.9s] expo= 90s elev=34.2deg humid= 51% sunelev=-13.5deg (moon at 116.0deg phase=0.52 elev=+26.0 )
AL_20150624_205727294_000000_00000001    59 stars filter R [  500.5s -   590.5s] expo= 90s elev=34.5deg humid= 51% sunelev=-13.7deg (moon at 116.0deg phase=0.52 elev=+26.0 )
AL_20150624_205908544_000000_00000001    68 stars filter C [  601.7s -   691.7s] expo= 90s elev=34.8deg humid= 51% sunelev=-13.9deg (moon at 116.0deg phase=0.52 elev=+26.0 )
AL_20150624_210049998_000000_00000001    67 stars filter C [  703.1s -   793.1s] expo= 90s elev=35.1deg humid= 51% sunelev=-14.1deg (moon at 116.0deg phase=0.52 elev=+25.0 )
AL_20150624_210231404_000000_00000001    57 stars filter R [  804.6s -   894.6s] expo= 90s elev=35.4deg humid= 51% sunelev=-14.2deg (moon at 116.0deg phase=0.52 elev=+25.0 )
AL_20150624_210411700_000000_00000001    72 stars filter C [  904.8s -   994.8s] expo= 90s elev=35.7deg humid= 52% sunelev=-14.4deg (moon at 116.0deg phase=0.52 elev=+25.0 )
AL_20150624_210551966_000000_00000001    73 stars filter C [ 1005.1s -  1095.1s] expo= 90s elev=36.0deg humid= 52% sunelev=-14.6deg (moon at 116.0deg phase=0.52 elev=+25.0 )
AL_20150624_210732278_000000_00000001    61 stars filter R [ 1105.4s -  1195.4s] expo= 90s elev=36.3deg humid= 52% sunelev=-14.8deg (moon at 116.0deg phase=0.52 elev=+24.0 )
AL_20150624_210913028_000000_00000001    75 stars filter C [ 1206.2s -  1296.2s] expo= 90s elev=36.6deg humid= 52% sunelev=-14.9deg (moon at 116.0deg phase=0.52 elev=+24.0 )
AL_20150624_211053997_000000_00000001    72 stars filter C [ 1307.2s -  1397.2s] expo= 90s elev=36.9deg humid= 52% sunelev=-15.1deg (moon at 116.0deg phase=0.52 elev=+24.0 )
AL_20150624_211234732_000000_00000001    60 stars filter R [ 1407.9s -  1497.9s] expo= 90s elev=37.2deg humid= 51% sunelev=-15.3deg (moon at 116.0deg phase=0.52 elev=+24.0 )
AL_20150624_211415747_000000_00000001    75 stars filter C [ 1508.9s -  1598.9s] expo= 90s elev=37.5deg humid= 51% sunelev=-15.5deg (moon at 116.0deg phase=0.52 elev=+23.0 )
AL_20150624_211726461_000000_00000001    89 stars filter C [ 1609.6s -  1789.6s] expo=180s elev=37.9deg humid= 51% sunelev=-15.6deg (moon at 116.0deg phase=0.52 elev=+23.0 )
AL_20150624_212037461_000000_00000001    88 stars filter C [ 1800.6s -  1980.6s] expo=180s elev=38.5deg humid= 51% sunelev=-15.9deg (moon at 116.0deg phase=0.52 elev=+23.0 )
AL_20150624_212348211_000000_00000001    66 stars filter R [ 1991.4s -  2171.4s] expo=180s elev=39.0deg humid= 52% sunelev=-16.2deg (moon at 116.0deg phase=0.52 elev=+22.0 )
AL_20150624_212659175_000000_00000001    86 stars filter C [ 2182.3s -  2362.3s] expo=180s elev=39.6deg humid= 52% sunelev=-16.5deg (moon at 116.0deg phase=0.52 elev=+22.0 )
AL_20150624_213010143_000000_00000001    85 stars filter C [ 2373.3s -  2553.3s] expo=180s elev=40.1deg humid= 52% sunelev=-16.8deg (moon at 116.0deg phase=0.52 elev=+21.0 )
AL_20150624_213321159_000000_00000001    75 stars filter R [ 2564.3s -  2744.3s] expo=180s elev=40.7deg humid= 51% sunelev=-17.1deg (moon at 116.0deg phase=0.53 elev=+21.0 )
AL_20150624_213631456_000000_00000001    88 stars filter C [ 2754.6s -  2934.6s] expo=180s elev=41.3deg humid= 51% sunelev=-17.4deg (moon at 116.0deg phase=0.53 elev=+20.0 )
AL_20150624_213941722_000000_00000001    81 stars filter C [ 2944.9s -  3124.9s] expo=180s elev=41.8deg humid= 51% sunelev=-17.7deg (moon at 116.0deg phase=0.53 elev=+20.0 )
AL_20150624_214251987_000000_00000001    72 stars filter R [ 3135.2s -  3315.2s] expo=180s elev=42.4deg humid= 51% sunelev=-17.9deg (moon at 116.0deg phase=0.53 elev=+19.0 )
AL_20150624_214602743_000000_00000001    87 stars filter C [ 3325.9s -  3505.9s] expo=180s elev=43.0deg humid= 51% sunelev=-18.2deg (moon at 116.0deg phase=0.53 elev=+19.0 )
AL_20150624_214913743_000000_00000001    87 stars filter C [ 3516.9s -  3696.9s] expo=180s elev=43.5deg humid= 51% sunelev=-18.4deg (moon at 116.0deg phase=0.53 elev=+18.0 )
AL_20150624_215028743_000000_00000001     0 star  filter R [ 3707.9s -  3887.9s] expo=180s elev=44.1deg humid= 51% sunelev=-18.7deg (moon at 116.0deg phase=0.53 elev=+18.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457198.36634 2015-06-24T20:47:31.776
Decoded useful notice informations.
RA(J2000.0) : 306.072414556 20h24m17s3
DEC(J2000.0) : 33.8609693412 +33d51m39s48
Error radius : 2.9 arcmin

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=73.1404293401 lat=-2.1331340056
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.496
Assuming Rv=3.1: Av=1.645 Ar=1.326 Ai=0.962 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
ROTSE last GRB images

Example of a GCNC email for this burst
GRB 150624: 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 150624 detected by INTEGRAL
(trigger 7126) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 18.9s after the GRB trigger
(13.7s after the notice). The elevation of the field increased from
33 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2015-06-24T20:47:31.776

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+18.9s to t0+78.9s : R > 15.1

The second image is 30.0s exposure in tracking mode:
t0+93.8s to t0+123.8s : R > 16.2

We co-added a series of exposures:
t0+93.8s to t0+388.5s : 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 18.9s 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= 73.1404 lat= -2.1331
and the galactic extinction in R band is 1.3 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.