- GCN/BACODINE POSITION NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Wed 15 Jul 09 17:25:59 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 357498, Seg_Num: 0
GRB_RA: 152.122d {+10h 08m 29s} (J2000),
152.248d {+10h 09m 00s} (current),
151.458d {+10h 05m 50s} (1950)
GRB_DEC: +9.997d {+09d 59' 51"} (J2000),
+9.950d {+09d 57' 02"} (current),
+10.243d {+10d 14' 34"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 2309 [cnts] Image_Peak=139 [image_cnts]
TRIGGER_DUR: 0.256 [sec]
TRIGGER_INDEX: 126 E_range: 50-350 keV
BKG_INTEN: 22677 [cnts]
BKG_TIME: 62723.08 SOD {17:25:23.08} UT
BKG_DUR: 8 [sec]
GRB_DATE: 15027 TJD; 196 DOY; 09/07/15
GRB_TIME: 62739.15 SOD {17:25:39.15} UT
GRB_PHI: -145.77 [deg]
GRB_THETA: 47.19 [deg]
SOLN_STATUS: 0x2003
RATE_SIGNIF: 57.83 [sigma]
IMAGE_SIGNIF: 9.85 [sigma]
MERIT_PARAMS: +1 +0 +0 -2 +3 +0 -100 +0 -79 +0
SUN_POSTN: 115.19d {+07h 40m 47s} +21.42d {+21d 25' 07"}
SUN_DIST: 37.36 [deg] Sun_angle= -2.5 [hr] (East of Sun)
MOON_POSTN: 23.09d {+01h 32m 22s} +15.37d {+15d 21' 59"}
MOON_DIST: 123.64 [deg]
MOON_ILLUM: 47 [%]
GAL_COORDS: 229.05, 48.01 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 150.55, -1.37 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: SWIFT-BAT GRB Coordinates.
COMMENTS: This is a rate trigger.
COMMENTS: A point_source was found.
COMMENTS: This does not match any source in the on-board catalog.
COMMENTS: This does not match any source in the ground catalog.
COMMENTS: There is a bright star (mag=4.37) 8.61 arcmin from this position.
COMMENTS: This is a GRB.
COMMENTS: This trigger occurred at longitude,latitude = 358.07,-3.17 [deg].
- red DSS finding chart
ps-file
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Wed 15 Jul 09 17:29:33 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 357498, Seg_Num: 0
GRB_RA: 152.122d {+10h 08m 29s} (J2000),
152.248d {+10h 09m 00s} (current),
151.458d {+10h 05m 50s} (1950)
GRB_DEC: +9.997d {+09d 59' 51"} (J2000),
+9.950d {+09d 57' 02"} (current),
+10.243d {+10d 14' 34"} (1950)
GRB_DATE: 15027 TJD; 196 DOY; 09/07/15
GRB_TIME: 62739.15 SOD {17:25:39.15} UT
TRIGGER_INDEX: 126
GRB_PHI: -145.77 [deg]
GRB_THETA: 47.19 [deg]
DELTA_TIME: -5.00 [sec]
TRIGGER_DUR: 0.256 [sec]
SOLN_STATUS: 0x2003
RATE_SIGNIF: 57.83 [sigma]
IMAGE_SIGNIF: 9.85 [sigma]
LC_URL: sw00357498000msb.lc
SUN_POSTN: 115.20d {+07h 40m 47s} +21.42d {+21d 25' 06"}
SUN_DIST: 37.35 [deg] Sun_angle= -2.5 [hr] (East of Sun)
MOON_POSTN: 23.12d {+01h 32m 30s} +15.38d {+15d 22' 42"}
MOON_DIST: 123.60 [deg]
MOON_ILLUM: 47 [%]
GAL_COORDS: 229.05, 48.01 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 150.55, -1.37 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: SWIFT-BAT GRB Lightcurve.
COMMENTS:
COMMENTS: The next comments were copied from the BAT_POS Notice:
COMMENTS: This is a rate trigger.
COMMENTS: A point_source was found.
COMMENTS: This does not match any source in the on-board catalog.
COMMENTS: This does not match any source in the ground catalog.
COMMENTS: There is a bright star (mag=4.37) 8.61 arcmin from this position.
COMMENTS: This is a GRB.
COMMENTS: This trigger occurred at longitude,latitude = 358.07,-3.17 [deg].
- GCN Circular #9666
J. L. Racusin (PSU), W. H. Baumgartner (GSFC/UMBC),
N. Gehrels (NASA/GSFC), C. Gronwall (PSU), D. Grupe (PSU),
S. T. Holland (CRESST/USRA/GSFC), R. Margutti (Univ Bicocca&OAB),
K. L. Page (U Leicester), D. M. Palmer (LANL),
P. Romano (INAF-IASFPA), M. H. Siegel (PSU),
M. Stamatikos (NASA/ORAU) and L. Vetere (PSU) report on behalf of the
Swift Team:
At 17:25:39 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 090715 (trigger=357498).
The BAT on-board calculated location is
RA, Dec 152.122, +9.997 which is
RA(J2000) = 10h 08m 29s
Dec(J2000) = +09d 59' 51"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a single-peaked
structure with a duration of about 0.4 sec. The peak count rate
was ~11,000 counts/sec (15-350 keV), at ~0.3 sec after the trigger.
Due to current problems with the Solid State Recorder (GCN 9664),
automatic slewing to sources is disabled. However, this burst
location is also in Sun constraint and will not come out of
constraint until October 9, 2009. There will thus be no XRT or
UVOT data for this trigger.
We note the existence of an S0/A galaxy NGC 3130 (z=0.027) near
the edge of the BAT error circle (nominal position of
the galaxy is 4.33 arcminutes from the center of the
error circle, with NED reporting a radius of 1.0 arcmin
for the galaxy).
Burst Advocate for this burst is J. L. Racusin (racusin AT astro.psu.edu).
Please contact the BA by email if you require additional information
regarding Swift followup of this burst. In extremely urgent cases, after
trying the Burst Advocate, you can contact the Swift PI by phone (see
Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
- GCN Circular #9667
S. B. Pandey (U Mich), S.A. Yost (College of St. Benedict), W. Zheng,
F. Yuan (U Mich), report on behalf of the ROTSE collaboration:
ROTSE-IIIc, located at the H.E.S.S. site at Mt. Gamsberg, Namibia,
responded to the short-hard GRB 090715A (Swift trigger 357498, Racusin J. L., GCN 9666), producing images
beginning 7.1 s after the GCN notice time. An automated response took
the first image at 17:26:05.1 UT, 25.9 s after the burst, under fair
conditions.
We took 10 5-sec and 10 20-sec exposures and imaging is ongoing.
These unfiltered images are calibrated relative to USNO A2.0 (R).
Comparison to the DSS (second epoch) reveals no new sources
within the 3-sigma Swift/BAT error circle, for both single images and
coadding into sets of 10.
Individual images have limiting magnitudes ranging from 15.4-16.6; we
set the following specific limits.
start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd?
--------------------------------------------------------------------
17:26:05.1 17:27:21.5 76 16.8 25.9 Y
17:27:36.4 17:32:18.5 282 17.4 117.2 Y
--------------------------------------------
- GCN Circular #9680
W. H. Baumgartner (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC),
E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),
C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), A. M. Parsons (GSFC),
J. L. Racusin (PSU), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS),
M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU)
(i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 090715A (trigger #357498)
(Racusin, et al., GCN Circ. 9666). The BAT ground-calculated position is
RA, Dec = 152.102, 10.006 deg, which is
RA(J2000) = 10h 08m 24.5s
Dec(J2000) = +10d 00' 22.4"
with an uncertainty of 2.4 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 22%.
The mask-weighted light curve shows a single spike starting at ~T-0.1 sec,
peaking at ~T+0.1 sec, and ending at ~T+0.7 sec. Following the intial spike,
there is extended emission from ~T+20 to ~T+55 sec at a flux level ~50 times
lower than the peak flux of the spike. T90 (15-350 keV) is 63 +- 18 sec
(estimated error including systematics).
The time-averaged spectrum from T-0.1 to T+67.8 sec is best fit by a simple
power-law model. We note that this spectral analysis includes both
the spike and the extended emission. Qualitatively, the spike is harder
than the extended emission. The power law index of the time-averaged spectrum is
1.28 +- 0.42. The fluence in the 15-150 keV band is 9.8 +- 2.2 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T-0.11 sec in the 15-150 keV band
is 3.9 +- 0.5 ph/cm2/sec. All the quoted errors are at the 90% confidence
level.
The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/357498/BA/
- GCN Circular #9682
S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin,
P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline
on behalf of the Konus-Wind team, report:
The short hard GRB 090715A (Swift trigger=357498:
Racusin et al., GCN 9666; Baumgartner et al., 9680)
triggered Konus-Wind at T0=62736.657 s UT (17:25:36.657).
The burst had a duration of ~0.32 s.
The Konus-Wind light curves of this GRB are available at
http://www.ioffe.ru/LEA/GRBs/GRB090715_T62736/
As observed by Konus-Wind the burst had
a fluence of 3.5(-1.5,+2.1)x10-6 erg/cm2, and
a 16-ms peak flux measured from T0+0.016 s
of 2.0(-0.8,+1.2)x10-5 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum of the burst
(from T0 to T0+0.128 s) is well fitted (in the 20 keV - 10 MeV range)
by a power law with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)
with alpha = -1.13(-0.25,+0.42),
and Ep = 1658(-1010,+3957)keV (chi2 = 8.9/13 dof).
Fitting by GRB (Band) model yields:
the low-energy photon index alpha = -0.90(-0.45,+1.2),
the high energy photon index beta < -1.5,
the peak energy Ep = 738(-614,+3775) keV (chi2 = 8.2/12 dof).
The emission is clearly seen up to 7 MeV.
All the quoted values are preliminary.
All the quoted errors are at the 90% confidence level.
- GCN Circular #9683
E. Berger and W.-f. Fong (Harvard) report:
"We observed the field centered on the BAT error circle of the short GRB
090715A (GCNs #9666,9680) with the VLA at a frequency of 8.46 GHz
starting on 2009 July 16.98 UT (30.1 hours post burst). We detect a
single bright source within the BAT error circle which is cataloged in
the VLA FIRST survey and is moreover extended. No other sources are
detected within the BAT error circle above a 4-sigma level of 85
microJy. In addition, we do not detect any point source in coincidence
with the nearby galaxy NGC3130."
- GCN Report 229.1
GCN_Report 229.1 has been posted:
http://gcn.gsfc.nasa.gov/reports/report_229_1.pdf
by J.L. Racusin
at PSU
titled: "Final Results on Swift GRB 090715A"
- GCN Circular #9686
S. Sugita, K. Yamaoka (Aoyama Gakuin U.), M. Ohno, M. Suzuki,
M. Kokubun, T. Takahashi (ISAS/JAXA), M. Tashiro, Y. Terada,
A. Endo, K. Onda, W. Iwakiri, T. Sugasahara (Saitama U.),
Y. E. Nakagawa, T. Tamagawa (RIKEN), N. Ohmori, A. Daikyuji,
E. Sonoda, K. Kono, H. Hayashi, K. Noda, Y. Nishioka, M. Yamauchi
(Univ. of Miyazaki), N. Vasquez (Tokyo Tech.), Y. Urata (NCU),
Y. Hanabata, T. Uehara, T. Takahashi, Y. Fukazawa (Hiroshima U.),
T. Enoto, K. Nakazawa, K. Makishima (Univ. of Tokyo), S. Hong
(Nihon U.), on behalf of the Suzaku WAM team, report:
The short hard GRB 090715A (Swift/BAT trigger #357498;
Racusin et al., GCN 9666; Baumgartner et al., GCN 9680)
triggered the Suzaku Wide-band All-sky Monitor (WAM) which covers an
energy range of 50 keV - 5 MeV at 2009-07-15 17:25:39.033 UT (=T0).
The observed light curve shows a multi-peaked structure, starting at
T0+0.05 s and ending at T0+0.70 s, with a total duration (T90) of about 0.5 s.
The fluence in 100 - 1000 keV was 1.13(-0.20, +0.08) x10^-6 erg/cm^2.
The 1-s peak flux measured from T0 s was 2.25(-0.29, +0.12) photons/cm^2/s
in the same energy range.
Preliminary result shows that the time-averaged spectrum from
T0 s to T0+1 s is well fitted by a power-law with exponential cutoff model:
dN/dE ~ E^{-alpha} * exp(-(2-alpha)*E/Epeak) with
alpha: 0.76(-0.46, +0.37), and
Epeak: 588(-118, +216) keV (chi^2/d.o.f. = 18.1/30).
All the quoted errors are at statistical 90% confidence level,
in which the systematic uncertainties are not included.
The light curves for this burst will be available at:
http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html
Previous IAU Circulars 