GRB150625_001959_INTEGRAL at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20150625_002122265_000000_00000001     0 star  filter C [   17.9s -    77.9s] expo= 60s elev=70.9deg humid= 51% sunelev=-22.0deg (moon at 115.0deg phase=0.53 elev= -7.0 )
AL_20150625_002207422_000000_00000001    81 stars filter C [   93.1s -   123.1s] expo= 30s elev=71.0deg humid= 52% sunelev=-22.0deg (moon at 115.0deg phase=0.53 elev= -8.0 )
AL_20150625_002248859_000000_00000001    82 stars filter C [  134.5s -   164.5s] expo= 30s elev=71.1deg humid= 52% sunelev=-21.9deg (moon at 115.0deg phase=0.53 elev= -8.0 )
AL_20150625_002329625_000000_00000001    85 stars filter C [  175.3s -   205.3s] expo= 30s elev=71.2deg humid= 52% sunelev=-21.9deg (moon at 115.0deg phase=0.53 elev= -8.0 )
AL_20150625_002410375_000000_00000001    85 stars filter C [  216.1s -   246.1s] expo= 30s elev=71.4deg humid= 52% sunelev=-21.9deg (moon at 115.0deg phase=0.53 elev= -8.0 )
AL_20150625_002450906_000000_00000001    81 stars filter C [  256.6s -   286.6s] expo= 30s elev=71.5deg humid= 52% sunelev=-21.9deg (moon at 115.0deg phase=0.53 elev= -8.0 )
AL_20150625_002632562_000000_00000001   107 stars filter C [  298.2s -   388.2s] expo= 90s elev=71.7deg humid= 53% sunelev=-21.8deg (moon at 115.0deg phase=0.53 elev= -8.0 )
AL_20150625_002813978_000000_00000001   109 stars filter C [  399.7s -   489.7s] expo= 90s elev=71.9deg humid= 53% sunelev=-21.8deg (moon at 115.0deg phase=0.53 elev= -9.0 )
AL_20150625_002954509_000000_00000001    90 stars filter R [  500.2s -   590.2s] expo= 90s elev=72.2deg humid= 53% sunelev=-21.7deg (moon at 115.0deg phase=0.53 elev= -9.0 )
AL_20150625_003135462_000000_00000001   108 stars filter C [  601.2s -   691.2s] expo= 90s elev=72.5deg humid= 53% sunelev=-21.6deg (moon at 115.0deg phase=0.53 elev= -9.0 )
AL_20150625_003316212_000000_00000001   112 stars filter C [  701.9s -   791.9s] expo= 90s elev=72.7deg humid= 53% sunelev=-21.5deg (moon at 115.0deg phase=0.53 elev= -9.0 )
AL_20150625_003457446_000000_00000001    90 stars filter R [  803.2s -   893.2s] expo= 90s elev=73.0deg humid= 53% sunelev=-21.5deg (moon at 115.0deg phase=0.53 elev=-10.0 )
AL_20150625_003638228_000000_00000001   105 stars filter C [  903.9s -   993.9s] expo= 90s elev=73.3deg humid= 53% sunelev=-21.4deg (moon at 115.0deg phase=0.53 elev=-10.0 )
AL_20150625_003819157_000000_00000001   106 stars filter C [ 1004.9s -  1094.9s] expo= 90s elev=73.5deg humid= 53% sunelev=-21.3deg (moon at 115.0deg phase=0.53 elev=-10.0 )
AL_20150625_003959453_000000_00000001    91 stars filter R [ 1105.2s -  1195.2s] expo= 90s elev=73.8deg humid= 52% sunelev=-21.2deg (moon at 115.0deg phase=0.53 elev=-11.0 )
AL_20150625_004140000_000000_00000001   110 stars filter C [ 1205.7s -  1295.7s] expo= 90s elev=74.1deg humid= 51% sunelev=-21.1deg (moon at 115.0deg phase=0.53 elev=-11.0 )
AL_20150625_004321407_000000_00000001   104 stars filter C [ 1307.1s -  1397.1s] expo= 90s elev=74.3deg humid= 51% sunelev=-21.1deg (moon at 115.0deg phase=0.53 elev=-11.0 )
AL_20150625_004502657_000000_00000001    90 stars filter R [ 1408.3s -  1498.3s] expo= 90s elev=74.6deg humid= 51% sunelev=-21.0deg (moon at 115.0deg phase=0.53 elev=-12.0 )
AL_20150625_004643407_000000_00000001   116 stars filter C [ 1509.1s -  1599.1s] expo= 90s elev=74.8deg humid= 51% sunelev=-20.9deg (moon at 115.0deg phase=0.53 elev=-12.0 )
AL_20150625_004954388_000000_00000001   119 stars filter C [ 1610.1s -  1790.1s] expo=180s elev=75.2deg humid= 51% sunelev=-20.8deg (moon at 115.0deg phase=0.53 elev=-12.0 )
AL_20150625_005304935_000000_00000001   122 stars filter C [ 1800.6s -  1980.6s] expo=180s elev=75.6deg humid= 50% sunelev=-20.6deg (moon at 115.0deg phase=0.53 elev=-13.0 )
AL_20150625_005459388_000000_00000001     0 star  filter R [ 2008.7s -  2188.7s] expo=180s elev=76.1deg humid= 50% sunelev=-20.4deg (moon at 115.0deg phase=0.53 elev=-13.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457198.51388 2015-06-25T00:19:59.232
Decoded useful notice informations.
RA(J2000.0) : 305.994934588 20h23m58s7
DEC(J2000.0) : 33.8484621718 +33d50m54s46
Error radius : 3.2 arcmin

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=73.0934492329 lat=-2.08796062565
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.494
Assuming Rv=3.1: Av=1.637 Ar=1.320 Ai=0.958 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 150625: 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 150625 detected by INTEGRAL
(trigger 7131) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 17.9s after the GRB trigger
(14.5s after the notice). The elevation of the field increased from
70 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2015-06-25T00:19:59.232

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+17.9s to t0+77.9s : R > 15.1

The second image is 30.0s exposure in tracking mode:
t0+93.1s to t0+123.1s : R > 16.2

We co-added a series of exposures:
t0+93.1s to t0+388.2s : 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 17.9s 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= 73.0934 lat= -2.0880
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.