GRB130131_135622_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20130131_173805552_000002_71009701     0 star  filter C [13118.5s - 13298.5s] expo=180s elev=12.1deg humid= 42% sunelev=-10.1deg (moon at  55.0deg phase=0.70 elev=-40.0 )
AL_20130131_174117228_000002_71009701     0 star  filter C [13310.2s - 13490.2s] expo=180s elev=12.4deg humid= 41% sunelev=-10.6deg (moon at  55.0deg phase=0.70 elev=-39.0 )
AL_20130131_174428417_000002_71009701     3 stars filter R [13501.4s - 13681.4s] expo=180s elev=12.7deg humid= 42% sunelev=-11.2deg (moon at  55.0deg phase=0.70 elev=-39.0 )
AL_20130131_174754933_000002_71009801     4 stars filter C [13707.9s - 13887.9s] expo=180s elev=13.1deg humid= 42% sunelev=-11.8deg (moon at  55.0deg phase=0.69 elev=-38.0 )
AL_20130131_175106874_000002_71009801     3 stars filter C [13899.8s - 14079.8s] expo=180s elev=13.4deg humid= 41% sunelev=-12.4deg (moon at  55.0deg phase=0.69 elev=-38.0 )
AL_20130131_175418125_000002_71009801    12 stars filter R [14091.0s - 14271.0s] expo=180s elev=13.7deg humid= 42% sunelev=-12.9deg (moon at  55.0deg phase=0.69 elev=-37.0 )
AL_20130131_175738155_000002_71009901     5 stars filter C [14291.0s - 14471.0s] expo=180s elev=14.1deg humid= 42% sunelev=-13.5deg (moon at  55.0deg phase=0.69 elev=-37.0 )
AL_20130131_180048895_000002_71009901     0 star  filter C [14481.8s - 14661.8s] expo=180s elev=14.4deg humid= 43% sunelev=-14.1deg (moon at  55.0deg phase=0.69 elev=-36.0 )
AL_20130131_180359817_000002_71009901     5 stars filter R [14672.7s - 14852.7s] expo=180s elev=14.7deg humid= 43% sunelev=-14.6deg (moon at  55.0deg phase=0.69 elev=-36.0 )
AL_20130131_180722160_000002_71010001     5 stars filter C [14875.1s - 15055.1s] expo=180s elev=15.1deg humid= 42% sunelev=-15.2deg (moon at  55.0deg phase=0.69 elev=-35.0 )
AL_20130131_181032902_000002_71010001     6 stars filter C [15065.8s - 15245.8s] expo=180s elev=15.4deg humid= 43% sunelev=-15.8deg (moon at  55.0deg phase=0.69 elev=-35.0 )
AL_20130131_181343916_000002_71010001     5 stars filter R [15256.8s - 15436.8s] expo=180s elev=15.8deg humid= 43% sunelev=-16.4deg (moon at  55.0deg phase=0.69 elev=-34.0 )
AL_20130131_183109114_000002_71010101     6 stars filter C [16302.0s - 16482.0s] expo=180s elev=17.7deg humid= 45% sunelev=-19.5deg (moon at  55.0deg phase=0.69 elev=-32.0 )
AL_20130131_183419614_000002_71010101     6 stars filter R [16492.5s - 16672.5s] expo=180s elev=18.1deg humid= 45% sunelev=-20.1deg (moon at  55.0deg phase=0.69 elev=-31.0 )
AL_20130131_183731287_000002_71010101     4 stars filter V [16684.2s - 16864.2s] expo=180s elev=18.4deg humid= 44% sunelev=-20.6deg (moon at  55.0deg phase=0.69 elev=-31.0 )
AL_20130131_185531232_000002_71010201     6 stars filter C [17764.1s - 17944.1s] expo=180s elev=20.6deg humid= 43% sunelev=-23.9deg (moon at  56.0deg phase=0.69 elev=-28.0 )
AL_20130131_185842670_000002_71010201     6 stars filter R [17955.6s - 18135.6s] expo=180s elev=21.0deg humid= 43% sunelev=-24.5deg (moon at  56.0deg phase=0.69 elev=-27.0 )
AL_20130131_190153848_000002_71010201     5 stars filter V [18146.8s - 18326.8s] expo=180s elev=21.3deg humid= 43% sunelev=-25.0deg (moon at  56.0deg phase=0.69 elev=-27.0 )
AL_20130131_192004557_000002_71010301     6 stars filter C [19237.4s - 19417.4s] expo=180s elev=23.6deg humid= 42% sunelev=-28.3deg (moon at  56.0deg phase=0.69 elev=-24.0 )
AL_20130131_192315482_000002_71010301     6 stars filter R [19428.4s - 19608.4s] expo=180s elev=24.0deg humid= 44% sunelev=-28.9deg (moon at  56.0deg phase=0.69 elev=-23.0 )
AL_20130131_192513075_000002_71010301     0 star  filter V [19619.8s - 19799.8s] expo=180s elev=24.5deg humid= 41% sunelev=-29.5deg (moon at  56.0deg phase=0.69 elev=-23.0 )
AL_20130131_201138572_000002_71010501     7 stars filter C [22331.5s - 22511.5s] expo=180s elev=30.6deg humid= 42% sunelev=-37.5deg (moon at  56.0deg phase=0.69 elev=-15.0 )
AL_20130131_201449338_000002_71010501     6 stars filter R [22522.2s - 22702.2s] expo=180s elev=31.0deg humid= 41% sunelev=-38.1deg (moon at  56.0deg phase=0.69 elev=-15.0 )
AL_20130131_201800306_000002_71010501     6 stars filter V [22713.2s - 22893.2s] expo=180s elev=31.5deg humid= 41% sunelev=-38.6deg (moon at  56.0deg phase=0.69 elev=-14.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2456324.08081 2013-01-31T13:56:21.984
Decoded useful notice informations.
RA(J2000.0) : 171.1229 11h24m29s4
DEC(J2000.0) : 48.0762 +48d04m34s31
Error radius : 3.2 arcsec
Error box : x=53:55 y=71:73 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=156.084657 lat=63.075457
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.014
Assuming Rv=3.1: Av=0.047 Ar=0.038 Ai=0.028 Extinction map E(B-V) from Schlegel:

Field of View is about 168 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 130131: TAROT Calern observatory optical observations
Klotz A. (IRAP-CNRS-OMP), Gendre B. (ASDC/INAF-OAR),
Boer M. (UNS-CNRS-OCA), Atteia J.L. (IRAP-CNRS-OMP) report:

We imaged the field of GRB 130131 detected by SWIFT
(trigger 547407) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 3.64h after the GRB trigger.
The elevation of the field increased from
12 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2013-01-31T13:56:21.984

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+13118.5s to t0+13298.5s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+13310.2s to t0+13490.2s : R > 16.2

We co-added a series of exposures:
t0+13310.2s to t0+14471.0s : 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 3.64h 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=156.0847 lat=+63.0755
and the galactic extinction in R band is 0.0 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.