GRB120514_011250_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20120514_012248808_000002_52679401    39 stars filter C [  533.7s -   593.7s] expo= 60s elev=37.6deg humid= 90% sunelev=-22.4deg (moon at  54.0deg phase=0.42 elev= +5.0 )
AL_20120514_012329318_000002_52679401    34 stars filter C [  604.2s -   634.2s] expo= 30s elev=37.7deg humid= 89% sunelev=-22.3deg (moon at  54.0deg phase=0.42 elev= +5.0 )
AL_20120514_012410241_000002_52679401    33 stars filter C [  645.1s -   675.1s] expo= 30s elev=37.7deg humid= 89% sunelev=-22.2deg (moon at  54.0deg phase=0.42 elev= +5.0 )
AL_20120514_012451272_000002_52679401    35 stars filter C [  686.1s -   716.1s] expo= 30s elev=37.8deg humid= 89% sunelev=-22.2deg (moon at  54.0deg phase=0.42 elev= +5.0 )
AL_20120514_012532474_000002_52679401    39 stars filter C [  727.3s -   757.3s] expo= 30s elev=37.8deg humid= 89% sunelev=-22.1deg (moon at  54.0deg phase=0.42 elev= +6.0 )
AL_20120514_012613397_000002_52679401    38 stars filter C [  768.3s -   798.3s] expo= 30s elev=37.9deg humid= 89% sunelev=-22.0deg (moon at  54.0deg phase=0.42 elev= +6.0 )
AL_20120514_012804615_000002_52679501    36 stars filter C [  819.5s -   909.5s] expo= 90s elev=38.0deg humid= 89% sunelev=-22.0deg (moon at  54.0deg phase=0.42 elev= +6.0 )
AL_20120514_012945302_000002_52679501    38 stars filter C [  920.2s -  1010.2s] expo= 90s elev=38.2deg humid= 88% sunelev=-21.8deg (moon at  54.0deg phase=0.42 elev= +6.0 )
AL_20120514_013126505_000002_52679501    43 stars filter C [ 1021.4s -  1111.4s] expo= 90s elev=38.3deg humid= 88% sunelev=-21.6deg (moon at  54.0deg phase=0.42 elev= +6.0 )
AL_20120514_013323967_000002_52679601    43 stars filter C [ 1138.9s -  1228.9s] expo= 90s elev=38.5deg humid= 88% sunelev=-21.5deg (moon at  54.0deg phase=0.42 elev= +7.0 )
AL_20120514_013504983_000002_52679601    45 stars filter C [ 1239.8s -  1329.8s] expo= 90s elev=38.6deg humid= 88% sunelev=-21.3deg (moon at  54.0deg phase=0.42 elev= +7.0 )
AL_20120514_013557140_000002_52679601     0 star  filter C [ 1340.8s -  1430.8s] expo= 90s elev=38.7deg humid= 87% sunelev=-21.1deg (moon at  54.0deg phase=0.42 elev= +7.0 )
AL_20120514_013842468_000002_52679701    42 stars filter C [ 1457.3s -  1547.3s] expo= 90s elev=38.9deg humid= 87% sunelev=-20.9deg (moon at  54.0deg phase=0.42 elev= +8.0 )
AL_20120514_014023203_000002_52679701    44 stars filter C [ 1558.1s -  1648.1s] expo= 90s elev=39.0deg humid= 87% sunelev=-20.8deg (moon at  54.0deg phase=0.42 elev= +8.0 )
AL_20120514_014204171_000002_52679701    44 stars filter C [ 1659.0s -  1749.0s] expo= 90s elev=39.2deg humid= 87% sunelev=-20.6deg (moon at  54.0deg phase=0.42 elev= +8.0 )
AL_20120514_014402082_000002_52679801    45 stars filter C [ 1776.9s -  1866.9s] expo= 90s elev=39.3deg humid= 87% sunelev=-20.4deg (moon at  54.0deg phase=0.42 elev= +9.0 )
AL_20120514_014542598_000002_52679801    48 stars filter C [ 1877.4s -  1967.4s] expo= 90s elev=39.4deg humid= 87% sunelev=-20.2deg (moon at  54.0deg phase=0.42 elev= +9.0 )
AL_20120514_014723567_000002_52679801    44 stars filter C [ 1978.4s -  2068.4s] expo= 90s elev=39.5deg humid= 87% sunelev=-20.1deg (moon at  54.0deg phase=0.42 elev= +9.0 )
AL_20120514_015129520_000002_52679901    51 stars filter C [ 2134.4s -  2314.4s] expo=180s elev=39.8deg humid= 86% sunelev=-19.8deg (moon at  54.0deg phase=0.42 elev=+10.0 )
AL_20120514_015439972_000002_52679901    44 stars filter C [ 2324.9s -  2504.9s] expo=180s elev=40.0deg humid= 86% sunelev=-19.5deg (moon at  54.0deg phase=0.42 elev=+10.0 )
AL_20120514_015750238_000002_52679901    35 stars filter R [ 2515.1s -  2695.1s] expo=180s elev=40.2deg humid= 86% sunelev=-19.1deg (moon at  54.0deg phase=0.42 elev=+11.0 )
AL_20120514_020119081_000002_52680001    44 stars filter C [ 2724.0s -  2904.0s] expo=180s elev=40.4deg humid= 87% sunelev=-18.7deg (moon at  54.0deg phase=0.42 elev=+11.0 )
AL_20120514_020430342_000002_52680001    45 stars filter C [ 2915.2s -  3095.2s] expo=180s elev=40.6deg humid= 86% sunelev=-18.4deg (moon at  54.0deg phase=0.42 elev=+12.0 )
AL_20120514_020525436_000002_52680001     0 star  filter R [ 3105.7s -  3285.7s] expo=180s elev=40.7deg humid= 87% sunelev=-18.0deg (moon at  54.0deg phase=0.42 elev=+13.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2456061.55058 2012-05-14T01:12:50.112
Decoded useful notice informations.
RA(J2000.0) : 283.0009 18h52m00s2
DEC(J2000.0) : -4.2626 -04d15m45s36
Error radius : 1.8 arcsec
Error box : x=52:53 y=52:53 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=29.206038 lat=-2.054185
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=1.150
Assuming Rv=3.1: Av=3.811 Ar=3.073 Ai=2.230 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
ROTSE last GRB images

Example of a GCNC email for this burst
GRB 120514: 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 120514 detected by SWIFT
(trigger 522197) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 533.7s after the GRB trigger
(127.6s after the notice). The elevation of the field increased from
37 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2012-05-14T01:12:50.112

The first image is trailed with a duration of 60.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any OT with a limiting magnitude of:
t0+533.7s to t0+593.7s : R > 15.1

The second image is 30.0s exposure in tracking mode:
t0+604.2s to t0+634.2s : R > 16.2

We co-added a series of exposures:
t0+604.2s to t0+909.5s : 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 533.7s 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= 29.2060 lat= -2.0542
and the galactic extinction in R band is 3.1 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.