GRB160501_004032_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20160501_013238408_000000_20610301     4 stars filter C [ 3009.6s -  3189.6s] expo=180s elev=20.2deg humid= 78% sunelev=-24.9deg (moon at  37.0deg phase=0.43 elev= +1.0 )
AL_20160501_014331094_000000_20610401    72 stars filter C [ 3593.9s -  3773.9s] expo=180s elev=21.3deg humid= 77% sunelev=-23.9deg (moon at  37.0deg phase=0.43 elev= +3.0 )
AL_20160501_014641890_000000_20610401    63 stars filter C [ 3784.6s -  3964.6s] expo=180s elev=21.6deg humid= 76% sunelev=-23.6deg (moon at  37.0deg phase=0.43 elev= +3.0 )
AL_20160501_014953187_000000_20610401    71 stars filter R [ 3975.8s -  4155.8s] expo=180s elev=21.9deg humid= 76% sunelev=-23.2deg (moon at  37.0deg phase=0.43 elev= +4.0 )
AL_20160501_015315202_000000_20610501    66 stars filter C [ 4177.9s -  4357.9s] expo=180s elev=22.3deg humid= 76% sunelev=-22.8deg (moon at  37.0deg phase=0.43 elev= +4.0 )
AL_20160501_015626615_000000_20610501    78 stars filter C [ 4369.4s -  4549.4s] expo=180s elev=22.6deg humid= 76% sunelev=-22.5deg (moon at  37.0deg phase=0.43 elev= +5.0 )
AL_20160501_015937349_000000_20610501    62 stars filter R [ 4560.1s -  4740.1s] expo=180s elev=22.9deg humid= 76% sunelev=-22.1deg (moon at  37.0deg phase=0.43 elev= +6.0 )
AL_20160501_020259443_000000_20610601    59 stars filter C [ 4762.0s -  4942.0s] expo=180s elev=23.2deg humid= 77% sunelev=-21.8deg (moon at  37.0deg phase=0.43 elev= +6.0 )
AL_20160501_020611080_000000_20610601    77 stars filter C [ 4953.7s -  5133.7s] expo=180s elev=23.5deg humid= 77% sunelev=-21.4deg (moon at  37.0deg phase=0.43 elev= +7.0 )
AL_20160501_020922518_000000_20610601    43 stars filter R [ 5145.1s -  5325.1s] expo=180s elev=23.8deg humid= 77% sunelev=-21.0deg (moon at  37.0deg phase=0.43 elev= +7.0 )
AL_20160501_021243705_000000_20610701    75 stars filter C [ 5346.3s -  5526.3s] expo=180s elev=24.1deg humid= 77% sunelev=-20.6deg (moon at  37.0deg phase=0.43 elev= +8.0 )
AL_20160501_021555377_000000_20610701    70 stars filter C [ 5538.0s -  5718.0s] expo=180s elev=24.4deg humid= 77% sunelev=-20.2deg (moon at  37.0deg phase=0.43 elev= +8.0 )
AL_20160501_021906633_000000_20610701    47 stars filter R [ 5729.2s -  5909.2s] expo=180s elev=24.6deg humid= 77% sunelev=-19.8deg (moon at  37.0deg phase=0.43 elev= +9.0 )
AL_20160501_022227367_000000_20610801    78 stars filter C [ 5929.9s -  6109.9s] expo=180s elev=24.9deg humid= 77% sunelev=-19.4deg (moon at  37.0deg phase=0.43 elev= +9.0 )
AL_20160501_022538289_000000_20610801    58 stars filter C [ 6120.9s -  6300.9s] expo=180s elev=25.2deg humid= 77% sunelev=-19.0deg (moon at  37.0deg phase=0.43 elev=+10.0 )
AL_20160501_022849051_000000_20610801    60 stars filter R [ 6311.7s -  6491.7s] expo=180s elev=25.4deg humid= 77% sunelev=-18.6deg (moon at  37.0deg phase=0.43 elev=+10.0 )
AL_20160501_023211176_000000_20610901    70 stars filter C [ 6513.8s -  6693.8s] expo=180s elev=25.7deg humid= 77% sunelev=-18.2deg (moon at  37.0deg phase=0.43 elev=+11.0 )
AL_20160501_023522863_000000_20610901    67 stars filter C [ 6705.5s -  6885.5s] expo=180s elev=25.9deg humid= 76% sunelev=-17.7deg (moon at  37.0deg phase=0.43 elev=+11.0 )
AL_20160501_023833843_000000_20610901    62 stars filter R [ 6896.4s -  7076.4s] expo=180s elev=26.1deg humid= 76% sunelev=-17.3deg (moon at  37.0deg phase=0.43 elev=+12.0 )
AL_20160501_024155015_000000_20611001    53 stars filter C [ 7097.6s -  7277.6s] expo=180s elev=26.3deg humid= 75% sunelev=-16.9deg (moon at  37.0deg phase=0.43 elev=+12.0 )
AL_20160501_024505812_000000_20611001    82 stars filter C [ 7288.4s -  7468.4s] expo=180s elev=26.5deg humid= 75% sunelev=-16.4deg (moon at  37.0deg phase=0.43 elev=+13.0 )
AL_20160501_024816736_000000_20611001    57 stars filter R [ 7479.4s -  7659.4s] expo=180s elev=26.7deg humid= 74% sunelev=-16.0deg (moon at  37.0deg phase=0.43 elev=+13.0 )
AL_20160501_025140018_000000_20611101    71 stars filter C [ 7682.6s -  7862.6s] expo=180s elev=26.9deg humid= 74% sunelev=-15.5deg (moon at  37.0deg phase=0.43 elev=+14.0 )
AL_20160501_025451486_000000_20611101    77 stars filter C [ 7874.1s -  8054.1s] expo=180s elev=27.1deg humid= 73% sunelev=-15.1deg (moon at  37.0deg phase=0.43 elev=+14.0 )
AL_20160501_025802566_000000_20611101    39 stars filter R [ 8065.1s -  8245.1s] expo=180s elev=27.3deg humid= 72% sunelev=-14.6deg (moon at  37.0deg phase=0.43 elev=+15.0 )
AL_20160501_030123238_000000_20611201    78 stars filter C [ 8265.8s -  8445.8s] expo=180s elev=27.5deg humid= 73% sunelev=-14.2deg (moon at  37.0deg phase=0.43 elev=+15.0 )
AL_20160501_030434957_000000_20611201    67 stars filter C [ 8457.5s -  8637.5s] expo=180s elev=27.6deg humid= 72% sunelev=-13.7deg (moon at  37.0deg phase=0.43 elev=+15.0 )
AL_20160501_030746093_000000_20611201    55 stars filter R [ 8648.7s -  8828.7s] expo=180s elev=27.8deg humid= 73% sunelev=-13.2deg (moon at  37.0deg phase=0.43 elev=+16.0 )
AL_20160501_031107233_000000_20611301    71 stars filter C [ 8849.9s -  9029.9s] expo=180s elev=27.9deg humid= 73% sunelev=-12.8deg (moon at  37.0deg phase=0.43 elev=+16.0 )
AL_20160501_031417827_000000_20611301    43 stars filter C [ 9040.6s -  9220.6s] expo=180s elev=28.1deg humid= 74% sunelev=-12.3deg (moon at  37.0deg phase=0.43 elev=+17.0 )
AL_20160501_031729305_000000_20611301    57 stars filter R [ 9232.1s -  9412.1s] expo=180s elev=28.2deg humid= 75% sunelev=-11.8deg (moon at  38.0deg phase=0.43 elev=+17.0 )
AL_20160501_032051180_000000_20611401    58 stars filter C [ 9434.0s -  9614.0s] expo=180s elev=28.3deg humid= 76% sunelev=-11.3deg (moon at  38.0deg phase=0.43 elev=+18.0 )
AL_20160501_032402399_000000_20611401    17 stars filter C [ 9625.2s -  9805.2s] expo=180s elev=28.4deg humid= 76% sunelev=-10.8deg (moon at  38.0deg phase=0.43 elev=+18.0 )
AL_20160501_032713149_000000_20611401    52 stars filter R [ 9815.9s -  9995.9s] expo=180s elev=28.5deg humid= 76% sunelev=-10.4deg (moon at  38.0deg phase=0.43 elev=+19.0 )
AL_20160501_033035028_000000_20611501     0 star  filter C [10017.8s - 10197.8s] expo=180s elev=28.6deg humid= 77% sunelev=-9.8deg (moon at  38.0deg phase=0.43 elev=+19.0 )
AL_20160501_033346450_000000_20611501     0 star  filter C [10209.2s - 10389.2s] expo=180s elev=28.7deg humid= 77% sunelev=-9.4deg (moon at  38.0deg phase=0.43 elev=+20.0 )
AL_20160501_033657231_000000_20611501    34 stars filter R [10400.0s - 10580.0s] expo=180s elev=28.8deg humid= 77% sunelev=-8.9deg (moon at  38.0deg phase=0.43 elev=+20.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457509.52815 2016-05-01T00:40:32.160
Decoded useful notice informations.
RA(J2000.0) : 286.3834 19h05m32s0
DEC(J2000.0) : -17.2407 -17d14m26s52
Error radius : 3.6 arcsec
Error box : x=57:59 y=63:65 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=18.9675823761 lat=-10.7947741508
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.376
Assuming Rv=3.1: Av=1.245 Ar=1.004 Ai=0.729
extmap.fit: Extinction map E(B-V) from Schlegel:

Field of View is about 61 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 160501: 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 160501 detected by SWIFT
(trigger 684679) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 50.16min 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 = 2016-05-01T00:40:32.160

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+3009.6s to t0+3189.6s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+3593.9s to t0+3773.9s : R > 16.2

We co-added a series of exposures:
t0+3593.9s to t0+4740.1s : 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 50.16min 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= 18.9676 lat=-10.7948
and the galactic extinction in R band is 1.0 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.
======================================================================