GRB151022_140632_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20151022_173146636_000003_57061301     0 star  filter C [12129.6s - 12309.6s] expo=180s elev=56.9deg humid= 88% sunelev=-9.9deg (moon at  70.0deg phase=0.63 elev=+30.0 )
AL_20151022_173457857_000003_57061301    36 stars filter C [12320.8s - 12500.8s] expo=180s elev=57.4deg humid= 88% sunelev=-10.5deg (moon at  70.0deg phase=0.63 elev=+30.0 )
AL_20151022_173809326_000003_57061301    44 stars filter R [12512.3s - 12692.3s] expo=180s elev=57.8deg humid= 89% sunelev=-11.0deg (moon at  70.0deg phase=0.63 elev=+30.0 )
AL_20151022_174133498_000003_57061401    51 stars filter C [12716.5s - 12896.5s] expo=180s elev=58.3deg humid= 89% sunelev=-11.7deg (moon at  70.0deg phase=0.63 elev=+31.0 )
AL_20151022_174444731_000003_57061401    54 stars filter C [12907.7s - 13087.7s] expo=180s elev=58.7deg humid= 89% sunelev=-12.2deg (moon at  70.0deg phase=0.63 elev=+31.0 )
AL_20151022_174755965_000003_57061401    56 stars filter R [13098.9s - 13278.9s] expo=180s elev=59.2deg humid= 89% sunelev=-12.8deg (moon at  70.0deg phase=0.63 elev=+31.0 )
AL_20151022_175118059_000003_57061501    60 stars filter C [13301.0s - 13481.0s] expo=180s elev=59.7deg humid= 89% sunelev=-13.4deg (moon at  70.0deg phase=0.63 elev=+31.0 )
AL_20151022_175428599_000003_57061501    68 stars filter C [13491.6s - 13671.6s] expo=180s elev=60.1deg humid= 89% sunelev=-14.0deg (moon at  70.0deg phase=0.63 elev=+32.0 )
AL_20151022_175739834_000003_57061501    58 stars filter R [13682.8s - 13862.8s] expo=180s elev=60.5deg humid= 88% sunelev=-14.6deg (moon at  70.0deg phase=0.63 elev=+32.0 )
AL_20151022_180101927_000003_57061601    69 stars filter C [13884.9s - 14064.9s] expo=180s elev=61.0deg humid= 88% sunelev=-15.2deg (moon at  70.0deg phase=0.63 elev=+32.0 )
AL_20151022_180413380_000003_57061601    72 stars filter C [14076.3s - 14256.3s] expo=180s elev=61.5deg humid= 89% sunelev=-15.7deg (moon at  70.0deg phase=0.63 elev=+32.0 )
AL_20151022_180724123_000003_57061601    54 stars filter R [14267.1s - 14447.1s] expo=180s elev=61.9deg humid= 88% sunelev=-16.3deg (moon at  70.0deg phase=0.63 elev=+32.0 )
AL_20151022_181045748_000003_57061701    70 stars filter C [14468.7s - 14648.7s] expo=180s elev=62.4deg humid= 87% sunelev=-16.9deg (moon at  70.0deg phase=0.63 elev=+33.0 )
AL_20151022_181356748_000003_57061701    72 stars filter C [14659.7s - 14839.7s] expo=180s elev=62.8deg humid= 86% sunelev=-17.5deg (moon at  70.0deg phase=0.63 elev=+33.0 )
AL_20151022_181708220_000003_57061701    62 stars filter R [14851.2s - 15031.2s] expo=180s elev=63.3deg humid= 87% sunelev=-18.1deg (moon at  70.0deg phase=0.63 elev=+33.0 )
AL_20151022_182029361_000003_57061801    72 stars filter C [15052.3s - 15232.3s] expo=180s elev=63.7deg humid= 87% sunelev=-18.7deg (moon at  70.0deg phase=0.64 elev=+33.0 )
AL_20151022_182340564_000003_57061801    75 stars filter C [15243.6s - 15423.6s] expo=180s elev=64.1deg humid= 87% sunelev=-19.3deg (moon at  70.0deg phase=0.64 elev=+33.0 )
AL_20151022_182651617_000003_57061801    63 stars filter R [15434.5s - 15614.5s] expo=180s elev=64.6deg humid= 87% sunelev=-19.8deg (moon at  70.0deg phase=0.64 elev=+33.0 )
AL_20151022_190548396_000003_57062001    71 stars filter C [17771.4s - 17951.4s] expo=180s elev=69.7deg humid= 80% sunelev=-26.8deg (moon at  70.0deg phase=0.64 elev=+34.0 )
AL_20151022_190859177_000003_57062001    66 stars filter R [17962.1s - 18142.1s] expo=180s elev=70.1deg humid= 80% sunelev=-27.4deg (moon at  70.0deg phase=0.64 elev=+34.0 )
AL_20151022_191210333_000003_57062001    57 stars filter V [18153.3s - 18333.3s] expo=180s elev=70.5deg humid= 80% sunelev=-27.9deg (moon at  70.0deg phase=0.64 elev=+34.0 )
AL_20151022_193008078_000003_57062101    76 stars filter C [19231.1s - 19411.1s] expo=180s elev=72.7deg humid= 79% sunelev=-31.1deg (moon at  70.0deg phase=0.64 elev=+34.0 )
AL_20151022_193318828_000003_57062101    66 stars filter R [19421.8s - 19601.8s] expo=180s elev=73.0deg humid= 80% sunelev=-31.7deg (moon at  70.0deg phase=0.64 elev=+34.0 )
AL_20151022_193629309_000003_57062101    54 stars filter V [19612.3s - 19792.3s] expo=180s elev=73.4deg humid= 80% sunelev=-32.2deg (moon at  70.0deg phase=0.64 elev=+34.0 )
AL_20151022_195434905_000003_57062201    70 stars filter C [20697.8s - 20877.8s] expo=180s elev=75.2deg humid= 80% sunelev=-35.3deg (moon at  70.0deg phase=0.64 elev=+34.0 )
AL_20151022_195745883_000003_57062201    64 stars filter R [20888.8s - 21068.8s] expo=180s elev=75.5deg humid= 80% sunelev=-35.8deg (moon at  70.0deg phase=0.64 elev=+33.0 )
AL_20151022_200057102_000003_57062201    53 stars filter V [21080.0s - 21260.0s] expo=180s elev=75.7deg humid= 80% sunelev=-36.4deg (moon at  70.0deg phase=0.64 elev=+33.0 )
AL_20151022_201902246_000003_57062301    75 stars filter C [22165.2s - 22345.2s] expo=180s elev=77.0deg humid= 80% sunelev=-39.4deg (moon at  69.0deg phase=0.64 elev=+32.0 )
AL_20151022_202212527_000003_57062301    66 stars filter R [22355.5s - 22535.5s] expo=180s elev=77.2deg humid= 80% sunelev=-39.9deg (moon at  69.0deg phase=0.64 elev=+32.0 )
AL_20151022_202523059_000003_57062301    58 stars filter V [22546.0s - 22726.0s] expo=180s elev=77.3deg humid= 80% sunelev=-40.4deg (moon at  69.0deg phase=0.64 elev=+32.0 )
AL_20151022_204342927_000003_57062401    77 stars filter C [23645.8s - 23825.8s] expo=180s elev=77.8deg humid= 80% sunelev=-43.3deg (moon at  69.0deg phase=0.64 elev=+31.0 )
AL_20151022_204653162_000003_57062401    58 stars filter R [23836.1s - 24016.1s] expo=180s elev=77.9deg humid= 79% sunelev=-43.7deg (moon at  69.0deg phase=0.64 elev=+31.0 )
AL_20151022_205004608_000003_57062401    56 stars filter V [24027.6s - 24207.6s] expo=180s elev=77.8deg humid= 79% sunelev=-44.2deg (moon at  69.0deg phase=0.64 elev=+30.0 )
AL_20151022_210806524_000003_57062501    78 stars filter C [25109.4s - 25289.4s] expo=180s elev=77.4deg humid= 78% sunelev=-46.8deg (moon at  69.0deg phase=0.64 elev=+29.0 )
AL_20151022_211117258_000003_57062501    62 stars filter R [25300.2s - 25480.2s] expo=180s elev=77.3deg humid= 78% sunelev=-47.3deg (moon at  69.0deg phase=0.64 elev=+28.0 )
AL_20151022_211428492_000003_57062501    56 stars filter V [25491.4s - 25671.4s] expo=180s elev=77.1deg humid= 78% sunelev=-47.7deg (moon at  69.0deg phase=0.64 elev=+28.0 )
AL_20151022_213237619_000003_57062601    72 stars filter C [26580.6s - 26760.6s] expo=180s elev=75.9deg humid= 79% sunelev=-50.1deg (moon at  69.0deg phase=0.64 elev=+26.0 )
AL_20151022_213548619_000003_57062601    60 stars filter R [26771.6s - 26951.6s] expo=180s elev=75.6deg humid= 78% sunelev=-50.5deg (moon at  69.0deg phase=0.64 elev=+26.0 )
AL_20151022_213858940_000003_57062601    47 stars filter V [26961.9s - 27141.9s] expo=180s elev=75.3deg humid= 78% sunelev=-50.9deg (moon at  69.0deg phase=0.64 elev=+26.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457318.08787 2015-10-22T14:06:31.968
Decoded useful notice informations.
RA(J2000.0) : 349.1972 23h16m47s3
DEC(J2000.0) : 55.8119 +55d48m42s83
Error radius : 1.8 arcsec
Error box : x=74:75 y=63:64 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=109.863690175 lat=-4.63996853296
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.981
Assuming Rv=3.1: Av=3.251 Ar=2.622 Ai=1.903
extmap.fit: Extinction map E(B-V) from Schlegel:

Field of View is about 57 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 151022: 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 151022 detected by SWIFT
(trigger 661036) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 3.37h after the GRB trigger.
The elevation of the field increased from
56 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2015-10-22T14:06:31.968

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+12129.6s to t0+12309.6s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+12320.8s to t0+12500.8s : R > 16.2

We co-added a series of exposures:
t0+12320.8s to t0+13481.0s : 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 3.37h 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=109.8637 lat= -4.6400
and the galactic extinction in R band is 2.6 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.
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