GRB 060510A
GCN Circular 5106
Subject
GRB060510A: XRT refined analysis
Date
2006-05-10T18:20:08Z (19 years ago)
From
Maria Laura Conciatore at ASDC <conciatore@asdc.asi.it>
M.L. Conciatore, M. Capalbi, M. Perri, L. Vetere (ASDC), H. A. Krimm
(GSFC/USRA)D. Burrows (PSU) report on behalf of the Swift/XRT team:
We have analysed the first orbit of XRT data from GRB 060510A.
A 1.8ks Photon Counting (PC) mode image provides a refined XRT position:
RA(J2000) = 06 23 28.0
Dec(J2000)= -01 09 44.2
with an uncertainty of 3.5 arcsec (90% containment).
This position is 1.3 arcsec away from the ground-calculated XRT position
quoted in Krimm et al. (GCN 5095), 15.2 arcseconds from the BAT position
(GCN 5095) and it is consistent with the UVOT position given in GCN 5095.
A power-law fit of the PC spectrum with a column density fixed to the
Galactic one (4.1 e21 cm^-2) gives a photon index of 2.1+/-0.5.
The 0.2-10.0 keV observed flux is 2.0E-10 erg cm^-2 s^-1, which
corresponds to an unabsorbed flux of 3.2E-10 erg cm^-2 s^-1.
The light curve shows a fast initial decay, followed by a flattening
phase. At about 1.2 ks from the trigger, it starts to decay again.
Further osbervations are ongoing.
This circular is an official product of the Swift XRT Team.
GCN Circular 5108
Subject
GRB 060510A: Refined analysis of the Swift-BAT burst
Date
2006-05-10T19:43:53Z (19 years ago)
From
Scott Barthelmy at NASA/GSFC <Scott@lheamail.gsfc.nasa.gov>
L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/ORAU),
E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho),
H. Krimm (GSFC/USRA), M. Koss (UMD), C. Markwardt (GSFC/UMD),
D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU),
G. Sato (GSFC/JSPS/USRA), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC)
on behalf of the Swift-BAT team:
Using the data set from T-240 to T+962 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 060510A (trigger #209351)
(Krimm, et al., GCN 5095). The BAT ground-calculated position is RA,Dec =
95.855, -1.166 deg {6h 23m 25.1s, -1d 9' 56.5"} (J2000) +- 1.2 arcmin,
(radius, sys+stat, 90% containment). The partial coding was 6%.
The mask-weighted lightcurves shows several overlapping peaks
starting at T-8 sec amd ;lasting out to T+25 sec.
T90 (15-350 keV) is 21 +- 3 sec (estimated error including systematics).
The time-averaged spectrum from T-7.0 to T+17.1 is best fit by
a simple power-law model. The power law index of the time-averaged spectrum
is 1.55 +- 0.10. The fluence in the 15-150 keV band is
9.8 +- 0.5 x 10^-6 erg/cm2. The 1-sec peak photon flux measured
from T+0.29 sec in the 15-150 keV band is 17.0 +- 1.9 ph/cm2/sec.
All the quoted errors are at the 90% confidence level. Because
this burst occured at the edge of the BAT FOV (note the low partial
coding percentage), the spectral fit values have an extra systematic error
contribution of about 10%.
GCN Circular 5113
Subject
Konus-Wind observation of GRB 060510A
Date
2006-05-11T13:39:12Z (19 years ago)
From
Valentin Pal'shin at Ioffe Inst <val@mail.ioffe.ru>
S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, and
T. Cline on behalf of the Konus-Wind team report:
The long GRB 060510A (Swift-BAT trigger #209351;
Krimm et al., GCN 5095; Barbier et al., GCN 5108)
triggered Konus-Wind at 27796.301 s UT (07:43:16.301).
As observed by Konus-Wind it had a duration of ~25 s,
fluence 2.55(-0.22,+0.07)x10^-5 erg/cm2,
and the 64-ms peak flux measured from T0+7.488 s
4.29(-0.72, +0.63)x10^-6 erg/cm2/s
(both in the 20 keV - 1 MeV energy range).
The burst shows a strong hard-to-soft spectral evolution.
Fitting the time-integrated spectrum of the burst
(from T0 to T0+24.064 s; in the 20 keV - 1 MeV range)
by a power law with exponential cutoff model:
dN/dE ~ E^(-alpha)*exp(-E*(2-alpha)/Ep)
yields alpha = 1.661(-0.076, +0.072)
and Ep = 184 (-24, +36) keV (chi2 = 63/48 dof).
All the quoted errors are at the 90% confidence level.
The K-W light curve is available at
http://www.ioffe.rssi.ru/LEA/GRBs/GRB060510_T27796/
GCN Circular 5116
Subject
GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
Date
2006-05-12T12:31:19Z (19 years ago)
From
Stephen Holland at USRA/NASA/GSFC/SSC <sholland@milkyway.gsfc.nasa.gov>
GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
S. T. Holland (NASA/GSFC & USRA) reports on behalf of the Swift/UVOT
team:
The Swift UVOT began observing GRB 060510A (trigger #209351,
Krimm et al., GCN Circular 5095) 82 seconds after the BAT trigger. We
detect the UVOT optical transient reported in the above Circular in
the White, V-, and U-band filters. The J2000 coordinates of the
afterglow are
RA = 06:23:27.98
Dec = -01:09:46.2
with an uncertainty of +/- 0.56 arcseconds (90% containment).
Magnitudes and 3-sigma upper limits are reported below.
Midpoint Coadded Upper
Filter Time Exposure Mag Err Limit
(sec) (sec) (3 sigma)
V 405 394 18.38 0.13
V 1060 394 18.85 0.16
B 688 10 18.4
B 1503 20 19.2
U 817 20 18.06 0.40
U 1479 20 18.3
UVW1 645 20 17.1
UVW1 793 20 17.4
UVM2 769 20 17.5
UVM2 1431 20 17.6
UVW2 721 20 17.6
UVM2 1384 20 17.7
White 150 99 18.04 0.15
White 702 10 18.24 0.50
White 1318 99 18.87 0.18
White 1521 10 18.12 0.40
White 1680 10 18.7
No correction has been made for the Galactic reddening of E(B-V) =
0.42 mag (Schlegel et al. 1998) along the line of sight to GRB
060510A.