GRB 060502A
GCN Circular 5060
Subject
GRB 060502A: TTT Observations
Date
2006-05-02T22:44:08Z (19 years ago)
From
Melissa Nysewander at UNC,Chapel Hill <mnysewan@astro.unc.edu>
M. Nysewander, J. Harvey, A. Foster, D. Reichart, J. A. Crain, K. Ivarsen
report on behalf of the UNC team of the FUN GRB Collaboration:
Under the automated control of SkyNet, the 0.37-m TTT telescope, located
outside of Fort Collins, Colorado, began observing the localization of GRB
060502A (Parola et al., GCN 5047) 65 seconds after the initial
notification, and 17.8 minutes after the time of the burst in the V & Red
filters.
In our first 160-s exposure at a mean time of 19.1 minutes after the burst,
we do not see the afterglow (Parola et al. GCN 5047, Cenko et al., 5048)
down to a 3-sigma limiting magnitude of R ~ 17.5.
GCN Circular 5068
Subject
GRB 060502A: Swift/UVOT source detection
Date
2006-05-03T10:35:52Z (19 years ago)
From
Tracey Poole at MSSL <tsp@mssl.ucl.ac.uk>
T. S. Poole (UCL-MSSL), and V. La Parola (INAF-IASFPA) on behalf of the
Swift/UVOT team.
The Swift/UVOT began observing the field of GRB060502 (BAT
Trigger=208169, V. La Parola, et. al, GCN 5047) at 03:04:56 UT, 84s
after the BAT trigger.
We detect a fading source with a calculated position of RA = 16:03:42.48
and Dec = +66:36:02.5 (J2000) in the V, B and White filters, and the
summed UVW1 filter. The error in the coordinates of the UVOT source is
+/- 0.56 arcsec (90% confidence). The position is 4.4 arcseconds from
the centre of the XRT error circle reported by V. La Parola, et. al,
(GCN 5054). Checks against the Digitized Sky Survey images yield no
known source at this position on the sky.
The calculated magnitudes of the first afterglow observations in the
UVOT filters are given below. The limiting magnitudes are given to a 3
sigma limit. These values are not corrected for Galactic extinction;
E(B-V) = 0.033.
Filter T_range(s) T_exp(s) Magnitude Comments
V 190-536 346 18.70 +/- 0.14 - source detection
V 5092-5292 200 20.19 - 3 sigma upper limit
B 4478-4678 200 20.04 +/- 0.16 - source detection
B 5910-6110 200 20.91 +/- 0.34 - source detection
U 4273-4473 200 20.84 - 3 sigma upper limit
U 5706-5905 200 20.78 - 3 sigma upper limit
UVW1 4069-4269 200 20.63 - 3 sigma upper limit
UVW1 5501-5701 200 20.61 - 3 sigma upper limit
UVW1 4069-5701 400 20.89 +/- 0.40 - source detection
UVM2 3864-4064 200 20.85 - 3 sigma upper limit
UVM2 5296-5496 200 21.03 - 3 sigma upper limit
UVW2 4888-5087 200 21.60 - 3 sigma upper limit
WHITE 84-184 100 18.50 +/- 0.07 - source detection
WHITE 4682-4882 200 20.53 +/- 0.20 - source detection
WHITE 6115-6314 200 21.22 - 3 sigma upper limit
Where T_range is time post-trigger, and T_exp is the exposure time of
the observation. A 6 arcsec radius was used for all filters.
When summing the two UVW1 200s exposures we see a source detection above
3 sigma. This give a z upper limit of 1.9.
This message may be cited.
GCN Circular 5070
Subject
GRB060502A, optical observation
Date
2006-05-03T15:33:17Z (19 years ago)
From
Peter Garnavich at U of Notre Dame <pgarnavi@nd.edu>
M. Hicken (CfA) and P. Garnavich (Notre Dame)
Images of the field around GRB 060502A (La Parola et al., GCN 5047)
were obtained with the FLWO 1.2m telescope and KepCAM beginning
on 2006 May 2.23 (UT). Four R-band exposures of 120 and 180
seconds were combined and the optical afterglow
(Cenko et al., GCN 5048) is detected but is faint.
The mean time of the combined exposures is 2.77 hours after
the burst. Using stars in the USNO-A2.0 for calibration, we
estimate the brightness of the afterglow to be R=20.1 +/- 0.3 mag.
Also using the USNO-A2.0 catalog we estimate the position of
the afterglow to be RA=16:03:42.63 DEC=66:36:03.7 (J2000)
with an error of 0.7" which is consistent with the Swift/UVOT
position (Poole et al., GCN 5068).
GCN Circular 5195
Subject
GRB 060502A: Optical afterglow observations
Date
2006-06-02T15:06:26Z (19 years ago)
From
Pall Jakobsson at U Hertfordshire <palli@star.herts.ac.uk>
Pall Jakobsson (Univ. of Hertfordshire), Erik Zackrisson,
Janne Holopainen (Tuorla Observatory), Genoveva Micheva
(Stockholm Observatory), Brian L. Jensen, Johan P. U. Fynbo
and Jens Hjorth (DARK, NBI) report:
Using MOSCA on the 2.56-meter Nordic Optical Telescope, we
obtained 3*300 s R-band images of the GRB 060502A field
(La Parola et al., GCN#5047) on May 3.21 (1.08 days post
burst). At the location of the optical afterglow (Pool et al.,
GCN#5068), 0.7 arcsec outside the XRT borders (La Parola et al.,
GCN#5054), we detect a source with R = 22.5. Combined with
the R-band magnitude reported by Hicken & Garnavich (GCN#5070),
this implies a decay slope of alpha = 1.0.
An image of the field is shown at:
http://star-www.herts.ac.uk/~palli/grb060502A/grb060502A.jpg