GRB 080828
GCN Circular 8151
Subject
GRB 080828: SuperAGILE GRB Localization
Date
2008-08-28T07:10:09Z (17 years ago)
From
Marco Feroci at IASF/INAF <feroci@iasf-roma.inaf.it>
E. Del Monte, P. Soffitta, I. Donnarumma, Y. Evangelista, M. Feroci,
F. Lazzarotto, L. Pacciani, E. Costa, I. Lapshov, M. Rapisarda
(INAF/IASF Rome), A. Giuliani, S. Vercellone, A. Chen,
S. Mereghetti, A. Pellizzoni, F. Perotti, F. Fornari, P.
Caraveo (INAF/IASF Milan), A. Bulgarelli, F. Gianotti,
M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi,
M. Galli, (INAF/IASF Bologna), M. Tavani, G. Pucella, F. D'Ammando, V.
Vittorini, A. Argan, A. Trois (INAF/IASF Rome), G. Barbiellini,
F. Longo (INFN Trieste), P. Picozza, A. Morselli (INFN Roma-2),
M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari,
D. Zanello (INFN Roma-1), and P. Giommi, C. Pittori, B. Preger,
P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI),
on behalf of the AGILE Team, report:
"SuperAGILE detected a gamma ray burst on 28 August 2008, at 03:14:45 UT.
The event had a duration of about 25 s in the 20-60 keV energy range,
with a single-peak structure.
The burst position was reconstructed
as (RA, Dec) (199.626 deg, -65.930 deg), which is:
RA(J2000) = 13h 18m 30.32s
Dec(J2000) = -65d 55' 48.2"
with an uncertainty of 3' radius. The given uncertainty accounts
for both the statistical and systematic errors.
An analysis of the AGILE Gamma Ray Imager (GRID) data is in progress."
This message may be cited.
GCN Circular 8157
Subject
GRB 080828: Swift-XRT detection of a possible X-ray afterglow
Date
2008-08-28T21:53:32Z (17 years ago)
From
Andy Beardmore at U Leicester <apb@star.le.ac.uk>
A.P. Beardmore and R.L.C. Starling (U. Leicester) report on behalf of the
Swift-XRT team:
The Swift-XRT began observations of the field of the SuperAGILE detected
GRB 080828 (Del Monte et al., GCN Circ 8151) at 2008-08-28 14:07:17UT,
39.15 ks after the burst. In 4.96 ks of photon counting mode data we
detect a faint, uncatalogued X-ray source at RA, Dec 199.5871, -65.9405
which is
RA (J2000) = 13:18:20.91
Dec (J2000) = -65:56:25.8
with an uncertainty of 4.2 arcsec (radius, 90% containment).
This source is 1.1 arcmin away from the AGILE position and within
its error circle.
The measured XRT count rate is 0.008 +/- 0.001 count/s. At this stage
we cannot tell whether the source is fading.
This circular is an official product of the Swift-XRT team.
GCN Circular 8161
Subject
GRB080828: Swift/UVOT Upper Limits
Date
2008-08-29T17:08:41Z (17 years ago)
From
Paul Ward at MSSL <paw@mssl.ucl.ac.uk>
P. Ward (MSSL-UCL) and W. Baumgartner (GSFC/UMBC) report on behalf of the
Swift/UVOT team:
The Swift/UVOT observed the field of GRB 080828 starting 39.15ks after the
SuperAGILE detection (Del Monte et al., GCN Circ. 8151). We do not detect
any afterglow at the Swift XRT position reported by Beardmore et al.
(GCN Circ. 8157) in any of the following UVOT filters down to the given 3
sigma upper limits.
Filter T_start(s) T_stop Exp(s) MagLimit
White 46201 46561 355.8 > 21.40
u 44376 51948 1798.8 > 20.65
b 45289 52309 1250.3 > 21.33
w1 40064 51035 1615.6 > 21.05
m2 39156 40055 899.8 > 20.50
The photometry is on the UVOT photometric system described in Poole et al.
(2008, MNRAS, 383,627). The above magnitudes are not corrected for the
Galactic extinction corresponding to a reddening of E(B-V) ~ 0.81 mag
(Schlegel et al., 1998).