- GCN/BACODINE POSITION NOTICE
TITLE: GCN/SuperAGILE NOTICE
NOTICE_DATE: Fri 28 May 10 08:25:40 UT
NOTICE_TYPE: SuperAGILE GRB Ground Position
TRIGGER_NUM: 1173
GRB_RA: 311.119d {+20h 44m 29s} (J2000),
311.229d {+20h 44m 55s} (current),
310.589d {+20h 42m 21s} (1950)
GRB_DEC: +27.810d {+27d 48' 36"} (J2000),
+27.848d {+27d 50' 53"} (current),
+27.628d {+27d 37' 40"} (1950)
GRB_ERROR: 5.00 [arcmin radius, statistical plus systematic]
GRB_INTEN: 359.799 387.330 [X & Y cnts]
GRB_SIGNIF: 8.78 11.92 [sigma]
GRB_DATE: 15344 TJD; 148 DOY; 10/05/28
GRB_TIME: 6487.00 SOD {01:48:07.00} UT
SUN_POSTN: 65.08d {+04h 20m 20s} +21.46d {+21d 27' 47"}
SUN_DIST: 99.32 [deg] Sun_angle= 7.6 [hr] (West of Sun)
MOON_POSTN: 249.63d {+16h 38m 31s} -24.70d {-24d 41' 44"}
MOON_DIST: 79.23 [deg]
MOON_ILLUM: 100 [%]
GAL_COORDS: 70.82, -9.21 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 323.80, 43.88 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: SuperAGILE GRB Coordinates.
COMMENTS: This is a GRB.
COMMENTS:
COMMENTS: NOTE: This AGILE event is temporally(6.0<100sec) coincident with the FERMI_GBM event (trignum=296704083).
COMMENTS: SuperAGILE ground GRB coordinates
- red DSS finding chart
ps-file
- GCN Circular #10810
E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, F. Lazzarotto,
L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda
(INAF/IASF Rome), G. Barbiellini, F. Longo, E. Moretti (INFN Trieste),
A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti,
F. Fuschino, M. Marisaldi, M. Galli (INAF/IASF Bologna),
A. Giuliani, A. Chen, S. Mereghetti, F. Perotti, P. Caraveo (INAF/IASF
Milan), M. Tavani, G. Pucella, V. Vittorini, A. Argan, A. Trois,
G. Piano, S. Sabatini (INAF/IASF Rome), A. Pellizzoni, M. Pilia
(INAF/OA Cagliari), S. Vercellone, F. D'Ammando (INAF/IASF Palermo),
P. W. Cattaneo, A. Rappoldi (INFN Pavia), P. Picozza, A. Morselli,
E. Striani, (INFN Roma-2), M. Prest, E. Vallazza (Universita`
dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1),
P. Giommi, C. Pittori, F. Lucarelli, P. Santolamazza, F. Verrecchia
(ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:
"SuperAGILE detected a gamma ray burst on 28 May 2010, at 01:48:05 UT.
The event had a duration of about 20 s in the 20-60 keV energy range,
with a single peak structure. Due to the AGILE spinning operative mode,
the measured duration may be a lower limit.
The burst position was reconstructed as (RA, Dec)
(311.119, 27.810) deg, which is:
RA(J2000) = 20h 44m 28.52s
Dec(J2000) = 27d 48' 35.80"
with an uncertainty of 5' radius. The given uncertainty accounts
for both the statistical and systematic errors.
AGILE MCAL reports significant detection above 1.4 MeV.
An analysis of the AGILE Gamma Ray Imager (GRID) data is in progress."
This message may be cited.
- GCN Circular #10811
Arne Rau (MPE) and Alexander van der Horst (UAH)
report on behalf of the Fermi GBM Team:
"At 01:48:01.11 UT on 28 May 2010, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 100528A (trigger 296704083 / 100528075)
which was also detected by the SuperAGILE (Del Monte et al. 2010, GCN 10810).
The GBM on-ground location is consistent with the SuperAGILE position.
The angle from the Fermi LAT boresight is 53 degrees.
The GBM light curve shows a main peak followed by a fainter
second pulse with a duration (T90) of about 24.6 +/- 0.5s (50-300 keV).
The time-averaged spectrum from T0+0.003 s to T0+24.576 s is best fit
by a Band function with Epeak = 316.5 +/- 17.8 keV, alpha = -1.16 +/- 0.02,
and beta = -1.99 +/- 0.06 (CSTAT 1868.5 for 657 d.o.f.).
The event fluence (10-1000 keV) in this time interval is
(2.77 +/- 0.02) E-05 erg/cm^2. The 1.024-sec peak photon flux measured
starting from T0+8.576 s in the 10-1000 keV band
is 14.76 +/- 0.21 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
- GCN Circular #10813
D. Grupe (PSU), M. Siegel (PSU), J. Gelbord (PSU), P.A. Evans and
M.R. Goad (U. Leicester) report on behalf of the Swift team:
We report of the Swift UVOT and XRT detections of a bright source
within the 5'
error radius of the SuperAGILE detected GRB 100528A (Del Monte et al.,
GCN Circ 10810) at a level of 2e-12 ergs/s/cm2 in the 0.3-10 keV band.
Swift started observing the field of GRB 100528A 42.5
ks after the AGILE detection and has observed it so far for 5 ks (two
orbits). At this point it is not obvious if the X-ray source is fading.
However, this X-ray source was not present during the ROSAT All-Sky
Survey. There is also an archival XMM data set that covers this
position (OBSID 0037990101, a 17ks exposure taken 2002-11-21).
There is no source detected at the position of the counter part.
Measuring the flux within a 30" radius of this position, the 4-sigma
upper limit of 5e-14 ergs/s/cm2 in the 0.2-12 keV band. Most likely
the X-ray source found by the XRT is the X-ray afterglow of GRB 100528A.
Using 2497 s of XRT Photon Counting mode data and 2 UVOT
images, we find an astrometrically corrected X-ray position (using the
XRT-UVOT alignment and matching UVOT field sources to the USNO-B1
catalogue): RA, Dec = 311.14130, 27.80660 which is equivalent to:
RA (J2000): 20 44 33.92
Dec (J2000): +27 48 23.8
with an uncertainty of 2.1 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest
position can be viewed at http://www.swift.ac.uk/xrt_positions. Position
enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans
et al. (2009, MNRAS, 397, 1177).
Using 4985 s of UVOT data take in the u, v and White filters,
we identify a faint uncataloged source within the XRT error circle
at a position in the white images of RA,DEC=311.14130, 27.80660 which
is equivalent to:
RA (J2000): 20 44 33.92
Dec (J2000): +27 48 23.8
with a 90%-confidence interval of about 0.60 arc sec. Preliminary
magnitudes using the UVOT photometric system (Poole et al. 2008,
MNRAS, 383, 627) are:
FILTER T_start(s) T_stop Exposure Mag
=========================================================
white 43296 49881 1632 20.96+-0.13
v 44124 50777 1721 20.01+-0.35
u 42469 49036 1632 20.63+-0.24
=========================================================
The above magnitudes are not corrected for the Galactic extinction
corresponding to a reddening of E_{B-V} = 0.29 (Schlegel et al.,
1998, ApJS, 500, 525). The photometry is on the UVOT photometric
system described in Poole et al. (2008, MNRAS, 383, 627).
This circular is an official product of the Swift team.
- GCN Circular #10814
D. Xu (Weizmann Inst.), P. Jakobsson (Univ. Iceland), A. Irrgang (Karl
Remeis Observatory & ECAP) report on behalf of a larger collaboration:
We observed the field of GRB 100528A (Del Monte et al., GCN 10810; Grupe
et al., GCN 10813) with the NOT equipped with ALFOSC in the B, V, R, and
i filters. Observations started on May 29 at 04:08 UT (26.34 hrs after
the GRB). We obtained 3x180 s frames in each filter.
An optical source is found at the UVOT position (Grupe et al., GCN
10813) and is clearly detected in the stacked frame in each filter.
Preliminary analysis shows the following Vega magnitudes:
m(B)=21.71+/-0.06 (mid_time=26.4417 hr)
m(V)=20.95+/-0.03 (mid_time=26.6751 hr)
m(R)=20.48+/-0.02 (mid_time=26.9090 hr)
m(i)= 20.02+-0.02 (mid_time= 27.1415 hr),
which are mainly calibrated against the #1178-0655113 star in the USNO
B1 catalog and the Galactic extinction is not taken into account.
The source is very likely the afterglow of GRB 100528A as there exists
decay in the V filter compared with the measurement in Grupe et al. (GCN
10813).
- GCN Circular #10815
P. Afonso (MPE Garching), A. Nicuesa, A. Rossi, S. Klose (TLS Tautenburg),
T. Kruehler, A. Yoldas and J. Greiner (MPE Garching), report on behalf
of the GROND team:
We observed the field of GRB 100528A discovered by SuperAGILE (Del Monte et
al., GCN #10810) and observed also by Fermi/GBM (Rau & van der Horst,
GCN #10811),
simultaneously in g'r'i'z'JHK with GROND (Greiner et al.2008, PASP 120,
405)
mounted at the 2.2 m MPI/ESO telescope at La Silla Observatory (Chile).
Observations started at 07:49 UT on March 30, 54 hours after the GRB
trigger. At the position of the UVOT detection (Grupe et al., GCN #10813)
we detect and confirm the afterglow mentioned also by Xu et al. (GCN
#10814).
Based on stacked images with a total integration time of 40 minutes in
JHK and
50 minutes in g'r'i'z' we estimate the following preliminary magnitudes
(all in the AB system):
g' = 21.93+-0.08
r' = 21.56+-0.04
i' = 21.27+-0.05
z' = 21.36+-0.07
J = 20.49+-0.10
H = 20.25+-0.12
K = 20.46+-0.21
All magnitudes given above are calibrated against SDSS and 2MASS field
stars.
No correction has been applied for the large, uncertain Galactic foreground
extinction corresponding to a reddening of E(B-V)~ 0.22 in the direction
of the burst (Schlegel et al. 1998).
- GCN Circular #10816
Z. Cano (Liverpool JMU) & D. Kopac (U. Ljubljana) report on behalf of a
larger collaboration:
On 2010 May 27 at 13:07:01 UT the 2-m Faulkes Telescope North (Hawaii)
began observing in the R and i' filters the SuperAGILE GRB 100528A (Del
Monte et al., GCN Circ. 10810), which was also detected by Fermi/GBM (Rau
& Van der Horst, GCN Circ. 10811).
We clearly detect the optical afterglow at the UVOT position (Grupe et
al., GCN Circ. 10813; Xu et al., GCN Circ. 10814; Afonso et al., GCN Circ.
10815) with the following magnitudes:
---------------------------------------------------------------------
T-To (days) Filter magnitude magnitude error
---------------------------------------------------------------------
1.51 r' 20.98 0.06
1.48 i' 20.88 0.08
---------------------------------------------------------------------
Photometry is calibrated and quoted with respect to SDSS stars in the field.
- GCN Circular #10817
S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, P.
Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind
team, report:
The long GRB 100528A localized by SuperAGILE (Del Monte et al., GCN
10810) triggered Konus-Wind at T0=6483.610 s UT (01:48:03.610).
The burst light curve shows a main pulse with a duration of ~30 s
followed by a much weaker and softer pulse at ~T0+44 s with a duration
of ~15 s.
As observed by Konus-Wind the burst
had a fluence of 2.85(-0.19, +0.21)x10^-5 erg/cm2,
and a 256-ms peak flux measured from T0+6.688 s
of 3.99(-0.58, +0.59)x10^-6 erg/cm2/s
(both in the 20 keV - 2 MeV energy range).
The time-integrated spectrum of the burst
(from T0 to T0+23.296 s) is well fitted (in the 20 keV - 2 MeV
range) by a power law with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep), with
alpha = -1.28(-0.06, +0.07), and
Ep = 382(-52, +69) keV (chi2 = 55.0/61 dof).
Fitting by a GRB (Band) model yields the same alpha and Ep,
and only an upper limit on the high energy
photon index: beta < -2.28 (chi2 = 55.0/60 dof).
The spectrum accumulated over the burst maximum (from T0 to T0+6.912 s)
is well fitted (in the 20 keV - 2 MeV range)
by a power law with exponential cutoff model with
alpha = -1.18 +/- 0.07, and
Ep = 558(-85, +115) keV (chi2 = 71.4/61 dof).
Fitting by GRB (Band) model yields the same alpha and Ep,
and only an upper limit on the high energy
photon index: beta < -2.43 (chi2 = 71.4/60 dof).
All the quoted errors are at the 90% confidence level.
The Konus-Wind light curve of this GRB is available
at http://www.ioffe.ru/LEA/GRBs/GRB100528_T06483/
Previous IAU Circulars 