GRB150624_215021_INTEGRAL at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20150624_215144414_000000_00000001     0 star  filter C [   18.8s -    78.8s] expo= 60s elev=44.2deg humid= 51% sunelev=-18.8deg (moon at 116.0deg phase=0.53 elev=+17.0 )
AL_20150624_215229539_000000_00000001    82 stars filter C [   93.9s -   123.9s] expo= 30s elev=44.4deg humid= 51% sunelev=-18.9deg (moon at 116.0deg phase=0.53 elev=+17.0 )
AL_20150624_215310055_000000_00000001    86 stars filter C [  134.4s -   164.4s] expo= 30s elev=44.5deg humid= 51% sunelev=-18.9deg (moon at 116.0deg phase=0.53 elev=+17.0 )
AL_20150624_215350571_000000_00000001    82 stars filter C [  174.9s -   204.9s] expo= 30s elev=44.6deg humid= 50% sunelev=-19.0deg (moon at 116.0deg phase=0.53 elev=+17.0 )
AL_20150624_215431321_000000_00000001    80 stars filter C [  215.7s -   245.7s] expo= 30s elev=44.7deg humid= 50% sunelev=-19.0deg (moon at 116.0deg phase=0.53 elev=+17.0 )
AL_20150624_215512078_000000_00000001    81 stars filter C [  256.5s -   286.5s] expo= 30s elev=44.9deg humid= 50% sunelev=-19.1deg (moon at 116.0deg phase=0.53 elev=+17.0 )
AL_20150624_215652797_000000_00000001   104 stars filter C [  297.2s -   387.2s] expo= 90s elev=45.1deg humid= 50% sunelev=-19.1deg (moon at 116.0deg phase=0.53 elev=+17.0 )
AL_20150624_215833828_000000_00000001   106 stars filter C [  398.2s -   488.2s] expo= 90s elev=45.4deg humid= 50% sunelev=-19.3deg (moon at 116.0deg phase=0.53 elev=+16.0 )
AL_20150624_220014328_000000_00000001    87 stars filter R [  498.7s -   588.7s] expo= 90s elev=45.7deg humid= 49% sunelev=-19.4deg (moon at 116.0deg phase=0.53 elev=+16.0 )
AL_20150624_220155547_000000_00000001   109 stars filter C [  599.9s -   689.9s] expo= 90s elev=46.0deg humid= 49% sunelev=-19.5deg (moon at 116.0deg phase=0.53 elev=+16.0 )
AL_20150624_220336297_000000_00000001   108 stars filter C [  700.7s -   790.7s] expo= 90s elev=46.3deg humid= 49% sunelev=-19.6deg (moon at 116.0deg phase=0.53 elev=+16.0 )
AL_20150624_220517467_000000_00000001    79 stars filter R [  801.9s -   891.9s] expo= 90s elev=46.6deg humid= 49% sunelev=-19.7deg (moon at 116.0deg phase=0.53 elev=+15.0 )
AL_20150624_220658670_000000_00000001   101 stars filter C [  903.1s -   993.1s] expo= 90s elev=46.9deg humid= 48% sunelev=-19.8deg (moon at 116.0deg phase=0.53 elev=+15.0 )
AL_20150624_220839248_000000_00000001   109 stars filter C [ 1003.6s -  1093.6s] expo= 90s elev=47.2deg humid= 48% sunelev=-20.0deg (moon at 116.0deg phase=0.53 elev=+15.0 )
AL_20150624_221020670_000000_00000001    89 stars filter R [ 1105.1s -  1195.1s] expo= 90s elev=47.5deg humid= 47% sunelev=-20.1deg (moon at 116.0deg phase=0.53 elev=+14.0 )
AL_20150624_221201186_000000_00000001   104 stars filter C [ 1205.6s -  1295.6s] expo= 90s elev=47.8deg humid= 48% sunelev=-20.2deg (moon at 116.0deg phase=0.53 elev=+14.0 )
AL_20150624_221342170_000000_00000001   100 stars filter C [ 1306.6s -  1396.6s] expo= 90s elev=48.1deg humid= 47% sunelev=-20.3deg (moon at 116.0deg phase=0.53 elev=+14.0 )
AL_20150624_221522899_000000_00000001    82 stars filter R [ 1407.3s -  1497.3s] expo= 90s elev=48.4deg humid= 47% sunelev=-20.4deg (moon at 116.0deg phase=0.53 elev=+14.0 )
AL_20150624_221703914_000000_00000001   101 stars filter C [ 1508.3s -  1598.3s] expo= 90s elev=48.7deg humid= 47% sunelev=-20.5deg (moon at 116.0deg phase=0.53 elev=+13.0 )
AL_20150624_222015367_000000_00000001   115 stars filter C [ 1609.7s -  1789.7s] expo=180s elev=49.1deg humid= 46% sunelev=-20.6deg (moon at 116.0deg phase=0.53 elev=+13.0 )
AL_20150624_222326117_000000_00000001   127 stars filter C [ 1800.5s -  1980.5s] expo=180s elev=49.7deg humid= 46% sunelev=-20.8deg (moon at 116.0deg phase=0.53 elev=+12.0 )
AL_20150624_222637543_000000_00000001    95 stars filter R [ 1991.9s -  2171.9s] expo=180s elev=50.3deg humid= 46% sunelev=-20.9deg (moon at 116.0deg phase=0.53 elev=+12.0 )
AL_20150624_222948058_000000_00000001   119 stars filter C [ 2182.4s -  2362.4s] expo=180s elev=50.9deg humid= 46% sunelev=-21.1deg (moon at 116.0deg phase=0.53 elev=+11.0 )
AL_20150624_223259246_000000_00000001   126 stars filter C [ 2373.6s -  2553.6s] expo=180s elev=51.4deg humid= 47% sunelev=-21.3deg (moon at 116.0deg phase=0.53 elev=+11.0 )
AL_20150624_223609534_000000_00000001    97 stars filter R [ 2563.9s -  2743.9s] expo=180s elev=52.0deg humid= 46% sunelev=-21.4deg (moon at 116.0deg phase=0.53 elev=+10.0 )
AL_20150624_223920050_000000_00000001   117 stars filter C [ 2754.5s -  2934.5s] expo=180s elev=52.6deg humid= 46% sunelev=-21.6deg (moon at 116.0deg phase=0.53 elev=+10.0 )
AL_20150624_224231534_000000_00000001   114 stars filter C [ 2945.9s -  3125.9s] expo=180s elev=53.2deg humid= 47% sunelev=-21.7deg (moon at 115.0deg phase=0.53 elev= +9.0 )
AL_20150624_224542972_000000_00000001   105 stars filter R [ 3137.3s -  3317.3s] expo=180s elev=53.7deg humid= 46% sunelev=-21.8deg (moon at 115.0deg phase=0.53 elev= +9.0 )
AL_20150624_224853726_000000_00000001   126 stars filter C [ 3328.1s -  3508.1s] expo=180s elev=54.3deg humid= 47% sunelev=-21.9deg (moon at 115.0deg phase=0.53 elev= +8.0 )
AL_20150624_225010211_000000_00000001     0 star  filter C [ 3519.3s -  3699.3s] expo=180s elev=54.9deg humid= 47% sunelev=-22.1deg (moon at 115.0deg phase=0.53 elev= +7.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457198.40996 2015-06-24T21:50:20.544
Decoded useful notice informations.
RA(J2000.0) : 306.035970241 20h24m08s6
DEC(J2000.0) : 33.8809132535 +33d52m51s28
Error radius : 3.2 arcmin

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=73.1395619422 lat=-2.09724839315
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.500
Assuming Rv=3.1: Av=1.657 Ar=1.336 Ai=0.970 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 7127) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 18.8s after the GRB trigger
(15.3s after the notice). The elevation of the field increased from
44 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2015-06-24T21:50:20.544

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+18.8s to t0+78.8s : R > 15.1

The second image is 30.0s exposure in tracking mode:
t0+93.9s to t0+123.9s : R > 16.2

We co-added a series of exposures:
t0+93.9s to t0+387.2s : 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 18.8s 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= 73.1396 lat= -2.0972
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.