GRB150615_183138_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20150615_202221819_000003_46220501     0 star  filter C [ 6458.6s -  6638.6s] expo=180s elev=22.6deg humid= 92% sunelev=-9.7deg (moon at 108.0deg phase=0.06 elev=-19.0 )
AL_20150615_202532173_000003_46220501    29 stars filter C [ 6648.9s -  6828.9s] expo=180s elev=23.1deg humid= 91% sunelev=-10.1deg (moon at 108.0deg phase=0.06 elev=-20.0 )
AL_20150615_202842923_000003_46220501    41 stars filter R [ 6839.6s -  7019.6s] expo=180s elev=23.6deg humid= 91% sunelev=-10.5deg (moon at 108.0deg phase=0.06 elev=-20.0 )
AL_20150615_203211735_000003_46220601    40 stars filter C [ 7048.4s -  7228.4s] expo=180s elev=24.2deg humid= 91% sunelev=-10.9deg (moon at 108.0deg phase=0.06 elev=-20.0 )
AL_20150615_203522945_000003_46220601    52 stars filter C [ 7239.7s -  7419.7s] expo=180s elev=24.7deg humid= 90% sunelev=-11.3deg (moon at 108.0deg phase=0.06 elev=-21.0 )
AL_20150615_203833960_000003_46220601    47 stars filter R [ 7430.6s -  7610.6s] expo=180s elev=25.2deg humid= 90% sunelev=-11.7deg (moon at 108.0deg phase=0.06 elev=-21.0 )
AL_20150615_204155585_000003_46220701    58 stars filter C [ 7632.3s -  7812.3s] expo=180s elev=25.8deg humid= 88% sunelev=-12.1deg (moon at 108.0deg phase=0.06 elev=-21.0 )
AL_20150615_204506847_000003_46220701    59 stars filter C [ 7823.5s -  8003.5s] expo=180s elev=26.3deg humid= 86% sunelev=-12.5deg (moon at 108.0deg phase=0.06 elev=-22.0 )
AL_20150615_204817315_000003_46220701    54 stars filter R [ 8014.0s -  8194.0s] expo=180s elev=26.8deg humid= 85% sunelev=-12.8deg (moon at 108.0deg phase=0.06 elev=-22.0 )
AL_20150615_205138909_000003_46220801    58 stars filter C [ 8215.7s -  8395.7s] expo=180s elev=27.4deg humid= 85% sunelev=-13.2deg (moon at 108.0deg phase=0.06 elev=-22.0 )
AL_20150615_205451355_000003_46220801    61 stars filter C [ 8408.0s -  8588.0s] expo=180s elev=27.9deg humid= 86% sunelev=-13.6deg (moon at 108.0deg phase=0.06 elev=-23.0 )
AL_20150615_205802574_000003_46220801    57 stars filter R [ 8599.3s -  8779.3s] expo=180s elev=28.5deg humid= 86% sunelev=-13.9deg (moon at 109.0deg phase=0.06 elev=-23.0 )
AL_20150615_210123730_000003_46220901    66 stars filter C [ 8800.4s -  8980.4s] expo=180s elev=29.0deg humid= 85% sunelev=-14.3deg (moon at 109.0deg phase=0.06 elev=-23.0 )
AL_20150615_210434715_000003_46220901    66 stars filter C [ 8991.4s -  9171.4s] expo=180s elev=29.6deg humid= 85% sunelev=-14.6deg (moon at 109.0deg phase=0.06 elev=-23.0 )
AL_20150615_210745461_000003_46220901    58 stars filter R [ 9182.2s -  9362.2s] expo=180s elev=30.1deg humid= 84% sunelev=-14.9deg (moon at 109.0deg phase=0.06 elev=-24.0 )
AL_20150615_211107164_000003_46221001    61 stars filter C [ 9383.8s -  9563.8s] expo=180s elev=30.7deg humid= 84% sunelev=-15.3deg (moon at 109.0deg phase=0.06 elev=-24.0 )
AL_20150615_211417633_000003_46221001    71 stars filter C [ 9574.3s -  9754.3s] expo=180s elev=31.2deg humid= 84% sunelev=-15.6deg (moon at 109.0deg phase=0.06 elev=-24.0 )
AL_20150615_211728156_000003_46221001    54 stars filter R [ 9764.9s -  9944.9s] expo=180s elev=31.8deg humid= 84% sunelev=-15.9deg (moon at 109.0deg phase=0.06 elev=-25.0 )
AL_20150615_212051406_000003_46221101    71 stars filter C [ 9968.1s - 10148.1s] expo=180s elev=32.4deg humid= 84% sunelev=-16.2deg (moon at 109.0deg phase=0.06 elev=-25.0 )
AL_20150615_212402203_000003_46221101    75 stars filter C [10158.9s - 10338.9s] expo=180s elev=32.9deg humid= 84% sunelev=-16.5deg (moon at 109.0deg phase=0.06 elev=-25.0 )
AL_20150615_212713384_000003_46221101    53 stars filter R [10350.1s - 10530.1s] expo=180s elev=33.5deg humid= 84% sunelev=-16.8deg (moon at 109.0deg phase=0.06 elev=-25.0 )
AL_20150615_213035743_000003_46221201    69 stars filter C [10552.4s - 10732.4s] expo=180s elev=34.0deg humid= 84% sunelev=-17.1deg (moon at 109.0deg phase=0.06 elev=-25.0 )
AL_20150615_213346681_000003_46221201    66 stars filter C [10743.4s - 10923.4s] expo=180s elev=34.6deg humid= 85% sunelev=-17.4deg (moon at 109.0deg phase=0.06 elev=-26.0 )
AL_20150615_213657983_000003_46221201    58 stars filter R [10934.6s - 11114.6s] expo=180s elev=35.1deg humid= 85% sunelev=-17.7deg (moon at 109.0deg phase=0.06 elev=-26.0 )
AL_20150615_214027952_000003_46221301    73 stars filter C [11144.6s - 11324.6s] expo=180s elev=35.8deg humid= 85% sunelev=-18.0deg (moon at 109.0deg phase=0.06 elev=-26.0 )
AL_20150615_214339155_000003_46221301    67 stars filter C [11335.9s - 11515.9s] expo=180s elev=36.3deg humid= 85% sunelev=-18.2deg (moon at 109.0deg phase=0.06 elev=-26.0 )
AL_20150615_214649677_000003_46221301    60 stars filter R [11526.4s - 11706.4s] expo=180s elev=36.9deg humid= 85% sunelev=-18.5deg (moon at 109.0deg phase=0.06 elev=-26.0 )
AL_20150615_215006458_000003_46221401    66 stars filter C [11723.1s - 11903.1s] expo=180s elev=37.4deg humid= 85% sunelev=-18.8deg (moon at 109.0deg phase=0.06 elev=-27.0 )
AL_20150615_215317646_000003_46221401    70 stars filter C [11914.4s - 12094.4s] expo=180s elev=38.0deg humid= 85% sunelev=-19.0deg (moon at 109.0deg phase=0.06 elev=-27.0 )
AL_20150615_215628398_000003_46221401    59 stars filter R [12105.1s - 12285.1s] expo=180s elev=38.6deg humid= 86% sunelev=-19.2deg (moon at 109.0deg phase=0.06 elev=-27.0 )
AL_20150615_215956570_000003_46221501    76 stars filter C [12313.3s - 12493.3s] expo=180s elev=39.2deg humid= 86% sunelev=-19.5deg (moon at 109.0deg phase=0.06 elev=-27.0 )
AL_20150615_220307054_000003_46221501    70 stars filter C [12503.8s - 12683.8s] expo=180s elev=39.7deg humid= 85% sunelev=-19.7deg (moon at 109.0deg phase=0.06 elev=-27.0 )
AL_20150615_220617625_000003_46221501    57 stars filter R [12694.3s - 12874.3s] expo=180s elev=40.3deg humid= 84% sunelev=-19.9deg (moon at 109.0deg phase=0.06 elev=-27.0 )
AL_20150615_220933406_000003_46221601    71 stars filter C [12890.1s - 13070.1s] expo=180s elev=40.9deg humid= 83% sunelev=-20.1deg (moon at 109.0deg phase=0.06 elev=-28.0 )
AL_20150615_221243953_000003_46221601    73 stars filter C [13080.7s - 13260.7s] expo=180s elev=41.4deg humid= 82% sunelev=-20.3deg (moon at 109.0deg phase=0.06 elev=-28.0 )
AL_20150615_221554515_000003_46221601    64 stars filter R [13271.2s - 13451.2s] expo=180s elev=42.0deg humid= 81% sunelev=-20.5deg (moon at 109.0deg phase=0.06 elev=-28.0 )
AL_20150615_221924044_000003_46221701    73 stars filter C [13480.7s - 13660.7s] expo=180s elev=42.6deg humid= 82% sunelev=-20.7deg (moon at 109.0deg phase=0.06 elev=-28.0 )
AL_20150615_222234513_000003_46221701    72 stars filter C [13671.2s - 13851.2s] expo=180s elev=43.2deg humid= 82% sunelev=-20.9deg (moon at 109.0deg phase=0.06 elev=-28.0 )
AL_20150615_222545278_000003_46221701    63 stars filter R [13862.0s - 14042.0s] expo=180s elev=43.8deg humid= 82% sunelev=-21.1deg (moon at 109.0deg phase=0.06 elev=-28.0 )
AL_20150615_222901135_000003_46221801    73 stars filter C [14057.8s - 14237.8s] expo=180s elev=44.4deg humid= 81% sunelev=-21.3deg (moon at 109.0deg phase=0.06 elev=-28.0 )
AL_20150615_223212542_000003_46221801    77 stars filter C [14249.3s - 14429.3s] expo=180s elev=44.9deg humid= 80% sunelev=-21.4deg (moon at 109.0deg phase=0.06 elev=-28.0 )
AL_20150615_223523042_000003_46221801    61 stars filter R [14439.8s - 14619.8s] expo=180s elev=45.5deg humid= 79% sunelev=-21.6deg (moon at 109.0deg phase=0.06 elev=-28.0 )
AL_20150615_224301183_000003_46222001    80 stars filter C [14897.9s - 15077.9s] expo=180s elev=46.9deg humid= 78% sunelev=-21.9deg (moon at 109.0deg phase=0.05 elev=-28.0 )
AL_20150615_224611949_000003_46222001    68 stars filter C [15088.7s - 15268.7s] expo=180s elev=47.4deg humid= 78% sunelev=-22.0deg (moon at 109.0deg phase=0.05 elev=-28.0 )
AL_20150615_224922714_000003_46222001    66 stars filter R [15279.4s - 15459.4s] expo=180s elev=48.0deg humid= 77% sunelev=-22.1deg (moon at 109.0deg phase=0.05 elev=-28.0 )
AL_20150615_230730242_000003_46222101    78 stars filter C [16366.9s - 16546.9s] expo=180s elev=51.3deg humid= 78% sunelev=-22.6deg (moon at 110.0deg phase=0.05 elev=-29.0 )
AL_20150615_231040899_000003_46222101    56 stars filter R [16557.7s - 16737.7s] expo=180s elev=51.9deg humid= 79% sunelev=-22.7deg (moon at 110.0deg phase=0.05 elev=-28.0 )
AL_20150615_231351914_000003_46222101    50 stars filter V [16748.6s - 16928.6s] expo=180s elev=52.4deg humid= 80% sunelev=-22.8deg (moon at 110.0deg phase=0.05 elev=-28.0 )
AL_20150615_233153071_000003_46222201    78 stars filter C [17829.8s - 18009.8s] expo=180s elev=55.7deg humid= 77% sunelev=-22.9deg (moon at 110.0deg phase=0.05 elev=-28.0 )
AL_20150615_233503758_000003_46222201    58 stars filter R [18020.5s - 18200.5s] expo=180s elev=56.3deg humid= 77% sunelev=-22.9deg (moon at 110.0deg phase=0.05 elev=-28.0 )
AL_20150615_233814779_000003_46222201    48 stars filter V [18211.5s - 18391.5s] expo=180s elev=56.8deg humid= 77% sunelev=-22.9deg (moon at 110.0deg phase=0.05 elev=-28.0 )
AL_20150615_235626847_000003_46222301    79 stars filter C [19303.6s - 19483.6s] expo=180s elev=60.1deg humid= 78% sunelev=-22.8deg (moon at 110.0deg phase=0.05 elev=-27.0 )
AL_20150615_235937389_000003_46222301    66 stars filter R [19494.1s - 19674.1s] expo=180s elev=60.7deg humid= 78% sunelev=-22.7deg (moon at 110.0deg phase=0.05 elev=-27.0 )
AL_20150616_000248139_000003_46222301    49 stars filter V [19684.8s - 19864.8s] expo=180s elev=61.3deg humid= 77% sunelev=-22.6deg (moon at 110.0deg phase=0.05 elev=-27.0 )
AL_20150616_002055824_000003_46222401    78 stars filter C [20772.5s - 20952.5s] expo=180s elev=64.5deg humid= 75% sunelev=-22.1deg (moon at 110.0deg phase=0.05 elev=-26.0 )
AL_20150616_002407293_000003_46222401    63 stars filter R [20963.9s - 21143.9s] expo=180s elev=65.1deg humid= 75% sunelev=-22.0deg (moon at 110.0deg phase=0.05 elev=-26.0 )
AL_20150616_002718215_000003_46222401    50 stars filter V [21154.9s - 21334.9s] expo=180s elev=65.6deg humid= 75% sunelev=-21.9deg (moon at 110.0deg phase=0.05 elev=-26.0 )
AL_20150616_004521529_000003_46222501    73 stars filter C [22238.2s - 22418.2s] expo=180s elev=68.8deg humid= 75% sunelev=-21.0deg (moon at 110.0deg phase=0.05 elev=-24.0 )
AL_20150616_004832717_000003_46222501    70 stars filter R [22429.4s - 22609.4s] expo=180s elev=69.3deg humid= 74% sunelev=-20.8deg (moon at 110.0deg phase=0.05 elev=-24.0 )
AL_20150616_005143242_000003_46222501    51 stars filter V [22620.0s - 22800.0s] expo=180s elev=69.8deg humid= 75% sunelev=-20.7deg (moon at 110.0deg phase=0.05 elev=-24.0 )
AL_20150616_010950599_000003_46222601    68 stars filter C [23707.3s - 23887.3s] expo=180s elev=72.8deg humid= 75% sunelev=-19.5deg (moon at 110.0deg phase=0.05 elev=-22.0 )
AL_20150616_011305521_000003_46222601    70 stars filter R [23902.2s - 24082.2s] expo=180s elev=73.3deg humid= 75% sunelev=-19.3deg (moon at 111.0deg phase=0.05 elev=-22.0 )
AL_20150616_011619974_000003_46222601    49 stars filter V [24096.7s - 24276.7s] expo=180s elev=73.8deg humid= 75% sunelev=-19.0deg (moon at 111.0deg phase=0.05 elev=-22.0 )
AL_20150616_013416778_000003_46222701    73 stars filter C [25173.5s - 25353.5s] expo=180s elev=76.4deg humid= 75% sunelev=-17.6deg (moon at 111.0deg phase=0.05 elev=-20.0 )
AL_20150616_013727763_000003_46222701    66 stars filter R [25364.5s - 25544.5s] expo=180s elev=76.8deg humid= 75% sunelev=-17.3deg (moon at 111.0deg phase=0.05 elev=-20.0 )
AL_20150616_014039220_000003_46222701    48 stars filter V [25555.9s - 25735.9s] expo=180s elev=77.2deg humid= 75% sunelev=-17.0deg (moon at 111.0deg phase=0.05 elev=-19.0 )
AL_20150616_015845693_000003_46222801    78 stars filter C [26642.3s - 26822.3s] expo=180s elev=79.1deg humid= 78% sunelev=-15.3deg (moon at 111.0deg phase=0.05 elev=-17.0 )
AL_20150616_020157102_000003_46222801    66 stars filter R [26833.6s - 27013.6s] expo=180s elev=79.4deg humid= 79% sunelev=-14.9deg (moon at 111.0deg phase=0.05 elev=-17.0 )
AL_20150616_020508149_000003_46222801    43 stars filter V [27024.8s - 27204.8s] expo=180s elev=79.6deg humid= 80% sunelev=-14.6deg (moon at 111.0deg phase=0.04 elev=-16.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457189.27197 2015-06-15T18:31:38.208
Decoded useful notice informations.
RA(J2000.0) : 306.0162 20h24m03s8
DEC(J2000.0) : 33.8673 +33d52m02s28
Error radius : 2.2 arcsec
Error box : x=69:70 y=83:84 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=73.1064371185 lat=-2.10421211119
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
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 150615: 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 150615 detected by SWIFT
(trigger 643949) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 1.79h after the GRB trigger.
The elevation of the field increased from
22 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2015-06-15T18:31:38.208

The first image is trailed with a duration of 180.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any OT with a limiting magnitude of:
t0+6458.6s to t0+6638.6s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+6648.9s to t0+6828.9s : R > 16.2

We co-added a series of exposures:
t0+6648.9s to t0+7812.3s : 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 1.79h 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= 73.1064 lat= -2.1042
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.
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