GRB151228_030513_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20151228_050240629_000000_05764601    10 stars filter C [ 6862.8s -  7042.8s] expo=180s elev=20.4deg humid= 43% sunelev=-21.6deg (moon at  87.0deg phase=0.81 elev=+39.0 )
AL_20151228_050552067_000000_05764601     9 stars filter C [ 7054.2s -  7234.2s] expo=180s elev=20.7deg humid= 43% sunelev=-21.1deg (moon at  87.0deg phase=0.81 elev=+39.0 )
AL_20151228_050902817_000000_05764601     6 stars filter R [ 7245.0s -  7425.0s] expo=180s elev=21.1deg humid= 41% sunelev=-20.5deg (moon at  87.0deg phase=0.81 elev=+38.0 )
AL_20151228_051234205_000000_05764701    10 stars filter C [ 7456.4s -  7636.4s] expo=180s elev=21.4deg humid= 41% sunelev=-19.9deg (moon at  87.0deg phase=0.81 elev=+37.0 )
AL_20151228_051545174_000000_05764701    10 stars filter C [ 7647.4s -  7827.4s] expo=180s elev=21.8deg humid= 40% sunelev=-19.3deg (moon at  87.0deg phase=0.81 elev=+37.0 )
AL_20151228_051856393_000000_05764701     9 stars filter R [ 7838.6s -  8018.6s] expo=180s elev=22.1deg humid= 39% sunelev=-18.8deg (moon at  87.0deg phase=0.81 elev=+36.0 )
AL_20151228_052212444_000000_05764801    10 stars filter C [ 8034.7s -  8214.7s] expo=180s elev=22.4deg humid= 39% sunelev=-18.2deg (moon at  87.0deg phase=0.81 elev=+36.0 )
AL_20151228_052522991_000000_05764801     9 stars filter C [ 8225.2s -  8405.2s] expo=180s elev=22.7deg humid= 39% sunelev=-17.7deg (moon at  87.0deg phase=0.81 elev=+35.0 )
AL_20151228_052834678_000000_05764801     9 stars filter R [ 8416.6s -  8596.6s] expo=180s elev=23.0deg humid= 39% sunelev=-17.1deg (moon at  87.0deg phase=0.81 elev=+35.0 )
AL_20151228_053153979_000000_05764901    10 stars filter C [ 8615.9s -  8795.9s] expo=180s elev=23.3deg humid= 39% sunelev=-16.5deg (moon at  87.0deg phase=0.81 elev=+34.0 )
AL_20151228_053505182_000000_05764901    11 stars filter C [ 8807.2s -  8987.2s] expo=180s elev=23.6deg humid= 40% sunelev=-16.0deg (moon at  87.0deg phase=0.81 elev=+34.0 )
AL_20151228_053816182_000000_05764901     8 stars filter R [ 8998.4s -  9178.4s] expo=180s elev=23.8deg humid= 40% sunelev=-15.4deg (moon at  87.0deg phase=0.81 elev=+33.0 )
AL_20151228_054136919_000000_05765001     8 stars filter C [ 9199.1s -  9379.1s] expo=180s elev=24.1deg humid= 40% sunelev=-14.9deg (moon at  87.0deg phase=0.81 elev=+32.0 )
AL_20151228_054448341_000000_05765001    10 stars filter C [ 9390.5s -  9570.5s] expo=180s elev=24.4deg humid= 40% sunelev=-14.3deg (moon at  87.0deg phase=0.81 elev=+32.0 )
AL_20151228_054759341_000000_05765001     6 stars filter R [ 9581.5s -  9761.5s] expo=180s elev=24.6deg humid= 39% sunelev=-13.8deg (moon at  87.0deg phase=0.81 elev=+31.0 )
AL_20151228_055122138_000000_05765101     9 stars filter C [ 9784.3s -  9964.3s] expo=180s elev=24.9deg humid= 38% sunelev=-13.2deg (moon at  87.0deg phase=0.81 elev=+31.0 )
AL_20151228_055433377_000000_05765101     8 stars filter C [ 9975.5s - 10155.5s] expo=180s elev=25.1deg humid= 37% sunelev=-12.7deg (moon at  87.0deg phase=0.81 elev=+30.0 )
AL_20151228_055744377_000000_05765101     5 stars filter R [10166.5s - 10346.5s] expo=180s elev=25.3deg humid= 37% sunelev=-12.1deg (moon at  87.0deg phase=0.81 elev=+30.0 )
AL_20151228_060105534_000000_05765201     0 star  filter C [10367.7s - 10547.7s] expo=180s elev=25.6deg humid= 37% sunelev=-11.5deg (moon at  87.0deg phase=0.81 elev=+29.0 )
AL_20151228_060416541_000000_05765201     0 star  filter C [10558.7s - 10738.7s] expo=180s elev=25.8deg humid= 37% sunelev=-11.0deg (moon at  87.0deg phase=0.81 elev=+28.0 )
AL_20151228_060727510_000000_05765201     3 stars filter R [10749.7s - 10929.7s] expo=180s elev=26.0deg humid= 37% sunelev=-10.5deg (moon at  87.0deg phase=0.81 elev=+28.0 )
AL_20151228_061049416_000000_05765301     0 star  filter C [10951.6s - 11131.6s] expo=180s elev=26.2deg humid= 37% sunelev=-9.9deg (moon at  87.0deg phase=0.81 elev=+27.0 )
AL_20151228_061400147_000000_05765301     0 star  filter C [11142.3s - 11322.3s] expo=180s elev=26.4deg humid= 37% sunelev=-9.4deg (moon at  87.0deg phase=0.81 elev=+27.0 )
AL_20151228_061711115_000000_05765301     0 star  filter R [11333.3s - 11513.3s] expo=180s elev=26.6deg humid= 37% sunelev=-8.9deg (moon at  87.0deg phase=0.81 elev=+26.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457384.62862 2015-12-28T03:05:12.768
Decoded useful notice informations.
RA(J2000.0) : 214.0039 14h16m00s9
DEC(J2000.0) : -17.689 -17d41m20s40
Error radius : 3.0 arcmin

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=329.893628761 lat=40.71310872
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.095
Assuming Rv=3.1: Av=0.316 Ar=0.254 Ai=0.185 Extinction map E(B-V) from Schlegel:

Field of View is about 93 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 151228: 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 151228 detected by SWIFT
(trigger 668543) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 1.91h after the GRB trigger.
The elevation of the field increased from
20 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2015-12-28T03:05:12.768

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+6862.8s to t0+7042.8s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+7054.2s to t0+7234.2s : R > 16.2

We co-added a series of exposures:
t0+7054.2s to t0+8214.7s : 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 1.91h 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=329.8936 lat=+40.7131
and the galactic extinction in R band is 0.3 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.