GRB160321_155527_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20160321_184055699_000000_16750901     0 star  filter C [ 9743.4s -  9923.4s] expo=180s elev=51.5deg humid= 87% sunelev=-10.3deg (moon at  64.0deg phase=0.90 elev=+26.0 )
AL_20160321_184406918_000000_16750901     0 star  filter C [ 9934.6s - 10114.6s] expo=180s elev=51.4deg humid= 86% sunelev=-10.9deg (moon at  64.0deg phase=0.90 elev=+27.0 )
AL_20160321_184717402_000000_16750901    19 stars filter R [10125.1s - 10305.1s] expo=180s elev=51.2deg humid= 86% sunelev=-11.4deg (moon at  64.0deg phase=0.90 elev=+27.0 )
AL_20160321_185048106_000000_16751001     0 star  filter C [10335.8s - 10515.8s] expo=180s elev=51.1deg humid= 87% sunelev=-12.0deg (moon at  64.0deg phase=0.90 elev=+28.0 )
AL_20160321_185358627_000000_16751001     0 star  filter C [10526.3s - 10706.3s] expo=180s elev=50.9deg humid= 87% sunelev=-12.6deg (moon at  64.0deg phase=0.90 elev=+29.0 )
AL_20160321_185709377_000000_16751001     0 star  filter R [10717.0s - 10897.0s] expo=180s elev=50.8deg humid= 87% sunelev=-13.2deg (moon at  64.0deg phase=0.90 elev=+29.0 )
AL_20160321_190026174_000000_16751101     0 star  filter C [10913.8s - 11093.8s] expo=180s elev=50.6deg humid= 88% sunelev=-13.7deg (moon at  64.0deg phase=0.90 elev=+30.0 )
AL_20160321_190336654_000000_16751101     0 star  filter C [11104.3s - 11284.3s] expo=180s elev=50.4deg humid= 88% sunelev=-14.3deg (moon at  64.0deg phase=0.90 elev=+30.0 )
AL_20160321_190647670_000000_16751101     0 star  filter R [11295.3s - 11475.3s] expo=180s elev=50.2deg humid= 88% sunelev=-14.8deg (moon at  64.0deg phase=0.90 elev=+31.0 )
AL_20160321_191007216_000000_16751201     0 star  filter C [11494.9s - 11674.9s] expo=180s elev=50.0deg humid= 87% sunelev=-15.4deg (moon at  64.0deg phase=0.90 elev=+31.0 )
AL_20160321_191317753_000000_16751201    42 stars filter C [11685.4s - 11865.4s] expo=180s elev=49.7deg humid= 87% sunelev=-16.0deg (moon at  64.0deg phase=0.90 elev=+32.0 )
AL_20160321_191628722_000000_16751201    33 stars filter R [11876.4s - 12056.4s] expo=180s elev=49.5deg humid= 87% sunelev=-16.5deg (moon at  64.0deg phase=0.90 elev=+32.0 )
AL_20160321_191951534_000000_16751301    43 stars filter C [12079.2s - 12259.2s] expo=180s elev=49.3deg humid= 87% sunelev=-17.1deg (moon at  64.0deg phase=0.90 elev=+33.0 )
AL_20160321_192302049_000000_16751301    38 stars filter C [12269.7s - 12449.7s] expo=180s elev=49.0deg humid= 87% sunelev=-17.6deg (moon at  64.0deg phase=0.90 elev=+33.0 )
AL_20160321_192612799_000000_16751301    33 stars filter R [12460.5s - 12640.5s] expo=180s elev=48.7deg humid= 87% sunelev=-18.2deg (moon at  64.0deg phase=0.90 elev=+34.0 )
AL_20160321_192935378_000000_16751401     0 star  filter C [12663.0s - 12843.0s] expo=180s elev=48.4deg humid= 87% sunelev=-18.8deg (moon at  64.0deg phase=0.90 elev=+34.0 )
AL_20160321_193246380_000000_16751401     0 star  filter C [12854.0s - 13034.0s] expo=180s elev=48.2deg humid= 86% sunelev=-19.3deg (moon at  64.0deg phase=0.90 elev=+35.0 )
AL_20160321_193556645_000000_16751401     0 star  filter R [13044.3s - 13224.3s] expo=180s elev=47.9deg humid= 86% sunelev=-19.8deg (moon at  64.0deg phase=0.90 elev=+35.0 )
AL_20160321_193919474_000000_16751501     0 star  filter C [13247.1s - 13427.1s] expo=180s elev=47.5deg humid= 86% sunelev=-20.4deg (moon at  64.0deg phase=0.90 elev=+36.0 )
AL_20160321_194230875_000000_16751501     0 star  filter C [13438.6s - 13618.6s] expo=180s elev=47.2deg humid= 86% sunelev=-20.9deg (moon at  64.0deg phase=0.90 elev=+36.0 )
AL_20160321_194541641_000000_16751501    27 stars filter R [13629.3s - 13809.3s] expo=180s elev=46.9deg humid= 86% sunelev=-21.5deg (moon at  64.0deg phase=0.90 elev=+36.0 )
AL_20160321_194903766_000000_16751601     0 star  filter C [13831.4s - 14011.4s] expo=180s elev=46.5deg humid= 86% sunelev=-22.0deg (moon at  64.0deg phase=0.90 elev=+37.0 )
AL_20160321_195214031_000000_16751601     0 star  filter C [14021.7s - 14201.7s] expo=180s elev=46.2deg humid= 86% sunelev=-22.5deg (moon at  64.0deg phase=0.90 elev=+37.0 )
AL_20160321_195525040_000000_16751601    25 stars filter R [14212.7s - 14392.7s] expo=180s elev=45.8deg humid= 86% sunelev=-23.1deg (moon at  64.0deg phase=0.90 elev=+38.0 )
AL_20160321_195847118_000000_16751701    43 stars filter C [14414.8s - 14594.8s] expo=180s elev=45.5deg humid= 86% sunelev=-23.6deg (moon at  64.0deg phase=0.90 elev=+38.0 )
AL_20160321_200157680_000000_16751701    45 stars filter C [14605.3s - 14785.3s] expo=180s elev=45.1deg humid= 86% sunelev=-24.1deg (moon at  64.0deg phase=0.90 elev=+39.0 )
AL_20160321_200508410_000000_16751701    33 stars filter R [14796.1s - 14976.1s] expo=180s elev=44.7deg humid= 86% sunelev=-24.6deg (moon at  64.0deg phase=0.90 elev=+39.0 )
AL_20160321_200831644_000000_16751801    41 stars filter C [14999.4s - 15179.4s] expo=180s elev=44.3deg humid= 85% sunelev=-25.2deg (moon at  64.0deg phase=0.90 elev=+40.0 )
AL_20160321_201142410_000000_16751801    35 stars filter C [15190.1s - 15370.1s] expo=180s elev=43.9deg humid= 86% sunelev=-25.7deg (moon at  64.0deg phase=0.90 elev=+40.0 )
AL_20160321_201453645_000000_16751801    45 stars filter R [15381.3s - 15561.3s] expo=180s elev=43.5deg humid= 86% sunelev=-26.2deg (moon at  64.0deg phase=0.90 elev=+41.0 )
AL_20160321_203047659_000000_16751901    50 stars filter C [16335.3s - 16515.3s] expo=180s elev=41.5deg humid= 87% sunelev=-28.7deg (moon at  64.0deg phase=0.90 elev=+43.0 )
AL_20160321_203358167_000000_16751901    46 stars filter R [16525.8s - 16705.8s] expo=180s elev=41.0deg humid= 87% sunelev=-29.1deg (moon at  64.0deg phase=0.90 elev=+43.0 )
AL_20160321_203709604_000000_16751901    36 stars filter V [16717.3s - 16897.3s] expo=180s elev=40.6deg humid= 86% sunelev=-29.6deg (moon at  64.0deg phase=0.90 elev=+43.0 )
AL_20160321_205513217_000000_16752001    46 stars filter C [17800.8s - 17980.8s] expo=180s elev=38.0deg humid= 86% sunelev=-32.2deg (moon at  65.0deg phase=0.90 elev=+45.0 )
AL_20160321_205823998_000000_16752001    42 stars filter R [17991.5s - 18171.5s] expo=180s elev=37.5deg humid= 86% sunelev=-32.7deg (moon at  65.0deg phase=0.90 elev=+46.0 )
AL_20160321_210134685_000000_16752001    34 stars filter V [18182.3s - 18362.3s] expo=180s elev=37.0deg humid= 87% sunelev=-33.1deg (moon at  65.0deg phase=0.90 elev=+46.0 )
AL_20160321_211944299_000000_16752101    50 stars filter C [19272.0s - 19452.0s] expo=180s elev=34.2deg humid= 86% sunelev=-35.6deg (moon at  65.0deg phase=0.90 elev=+48.0 )
AL_20160321_212255752_000000_16752101    44 stars filter R [19463.4s - 19643.4s] expo=180s elev=33.7deg humid= 86% sunelev=-36.0deg (moon at  65.0deg phase=0.90 elev=+48.0 )
AL_20160321_212606242_000000_16752101    35 stars filter V [19653.9s - 19833.9s] expo=180s elev=33.2deg humid= 87% sunelev=-36.4deg (moon at  65.0deg phase=0.90 elev=+48.0 )
AL_20160321_214413964_000000_16752201    47 stars filter C [20741.5s - 20921.5s] expo=180s elev=30.2deg humid= 87% sunelev=-38.5deg (moon at  65.0deg phase=0.90 elev=+49.0 )
AL_20160321_214725305_000000_16752201    38 stars filter R [20932.7s - 21112.7s] expo=180s elev=29.7deg humid= 86% sunelev=-38.9deg (moon at  65.0deg phase=0.90 elev=+49.0 )
AL_20160321_215036758_000000_16752201    35 stars filter V [21124.1s - 21304.1s] expo=180s elev=29.2deg humid= 86% sunelev=-39.2deg (moon at  65.0deg phase=0.90 elev=+50.0 )
AL_20160321_220839975_000000_16752301    45 stars filter C [22207.7s - 22387.7s] expo=180s elev=26.1deg humid= 88% sunelev=-41.1deg (moon at  65.0deg phase=0.91 elev=+50.0 )
AL_20160321_221150710_000000_16752301    34 stars filter R [22398.4s - 22578.4s] expo=180s elev=25.6deg humid= 87% sunelev=-41.3deg (moon at  65.0deg phase=0.91 elev=+50.0 )
AL_20160321_221501491_000000_16752301    34 stars filter V [22589.2s - 22769.2s] expo=180s elev=25.0deg humid= 86% sunelev=-41.6deg (moon at  65.0deg phase=0.91 elev=+50.0 )
AL_20160321_223311831_000000_16752401    44 stars filter C [23679.5s - 23859.5s] expo=180s elev=21.9deg humid= 86% sunelev=-43.1deg (moon at  65.0deg phase=0.91 elev=+51.0 )
AL_20160321_223623232_000000_16752401    31 stars filter R [23870.9s - 24050.9s] expo=180s elev=21.3deg humid= 86% sunelev=-43.3deg (moon at  65.0deg phase=0.91 elev=+51.0 )
AL_20160321_223933795_000000_16752401    28 stars filter V [24061.4s - 24241.4s] expo=180s elev=20.7deg humid= 85% sunelev=-43.5deg (moon at  65.0deg phase=0.91 elev=+51.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457469.16351 2016-03-21T15:55:27.264
Decoded useful notice informations.
RA(J2000.0) : 99.4192 06h37m40s6
DEC(J2000.0) : 5.7473 +05d44m50s27
Error radius : 2.2 arcsec
Error box : x=59:60 y=100:101 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=206.277068908 lat=-0.447651469349
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=16.989
Assuming Rv=3.1: Av=56.318 Ar=45.411 Ai=32.958 Extinction map E(B-V) from Schlegel:

Field of View is about 55 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 160321: 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 160321 detected by SWIFT
(trigger 680017) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 2.71h after the GRB trigger.
The elevation of the field decreased from
51 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2016-03-21T15:55:27.264

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+9743.4s to t0+9923.4s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+9934.6s to t0+10114.6s : R > 16.2

We co-added a series of exposures:
t0+9934.6s to t0+11093.8s : 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 2.71h 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=206.2771 lat= -0.4477
and the galactic extinction in R band is 45.4 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.