GRB 090709
GCN Circular 9625
Subject
GRB 090709: Swift detection of a bright burst
Date
2009-07-09T08:07:08Z (16 years ago)
From
David Palmer at LANL <palmer@lanl.gov>
D. C. Morris (PSU), A. P. Beardmore (U Leicester),
P. A. Evans (U Leicester), H. A. Krimm (CRESST/GSFC/USRA),
V. Mangano (INAF-IASFPA), J. Mao (INAF-OAB),
C. B. Markwardt (CRESST/GSFC/UMD), K. L. Page (U Leicester),
D. M. Palmer (LANL), A. Rowlinson (U Leicester), M. H. Siegel (PSU),
M. A. Stark (PSU), G. Tagliaferri (INAF-OAB),
T. N. Ukwatta (GSFC/GWU) and H. Ziaeepour (UCL-MSSL) report on behalf
of the Swift Team:
At 07:38:34 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 090709 (trigger=356890). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 289.933, +60.731 which is
RA(J2000) = 19h 19m 44s
Dec(J2000) = +60d 43' 52"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed about four major
peaks starting at T-20 and continuing to T+100 seconds. The peak
count rate was ~15000 counts/sec (15-350 keV), at ~25 sec after the trigger.
The XRT began observing the field at 07:39:42 UT, 67.8 seconds after the BAT
trigger. In the 2.5-s image-mode data we find a fading, uncatalogued X-ray
source with a position: RA, Dec 289.9291, +60.7271 which is equivalent to:
RA(J2000) = 19h 19m 42.99s
Dec(J2000) = +60d 43' 37.5"
with an uncertainty of 4 arcseconds (radius, 90% containment). This
location is 16 arcseconds from the BAT onboard position, within the BAT
error circle.
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 76 seconds after the BAT trigger. No credible afterglow candidate has
been found in the initial data products. The overlap of the sub-image and the
XRT error circle is 100%. The overlap of the 8'x8' region for the list of
sources generated on-board and the XRT error circle is 100%. No correction
has been made for the expected extinction corresponding to E(B-V) of 0.09.
Burst Advocate for this burst is D. C. Morris (morris 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 9626
Subject
GRB 090709: ROTSE-III Optical Limits
Date
2009-07-09T08:32:56Z (16 years ago)
From
Fang Yuan at ROTSE <yuanfang@umich.edu>
S. B. Pandey (U Mich), W. Rujopakarn (Steward), H. Flewelling (IfA/
Hawaii), F. Yuan (U Mich), B. E. Schaefer (Louisiana State), report on
behalf of the ROTSE collaboration:
ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB
090709 (Swift trigger 356890; Morris D. C., GCN 9625), producing
images beginning 5.6 s after the GCN notice time. An automated
response took the first image at 07:39:00.6 UT, 26.0 s after the
burst, and during the gamma-ray emission, under good conditions. We
took 10 5-sec and 50 20-sec exposures. These unfiltered images are
calibrated relative to USNO A2.0 (R). Imaging is on going.
Comparison to the DSS (second epoch) reveals no new sources within the
3-sigma Swift/BAT error circle or the XRT error circle, for both
single images and coadding into sets of 10. Individual images have
limiting magnitudes ranging from 16.4-17.2; we set the following
specific limits.
start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd?
--------------------------------------------------------------------
07:39:00.6 07:39:05.6 5 16.5 26.0 N
07:39:00.6 07:40:07.7 67 17.8 26.0 Y
07:40:20.2 07:45:02.4 282 18.2 105.6 Y
GCN Circular 9628
Subject
GRB 090709: PAIRITEL NIR Upper Limits
Date
2009-07-09T08:58:46Z (16 years ago)
From
Adam Morgan at U.C. Berkeley <qmorgan@gmail.com>
A. N. Morgan, C. R. Klein, D. A. Perley, J. S. Bloom, (UC Berkeley), report:
We observed the field of GRB 090709 (Morris et al., GCN 9625) with the
1.3m PAIRITEL located at Mt. Hopkins, Arizona. Observations began at
2009-07-09 07:40:22 UT, ~108 seconds after the Swift trigger. In
preliminary mosaics (effective exposure time of ~374 seconds) taken
simultaneously in the J, H, and Ks filters, we detect no source at the
XRT position.
The preliminary photometry yields:
post_burst
t_mid(s) exp(s) filt U. Limit (3 sig)
438 374 J > 17.7
438 374 H > 16.9
438 374 Ks > 15.3
All magnitudes given in the Vega system, calibrated to 2MASS. No
correction for Galactic extinction has been made to the above reported
values. Observations are ongoing.
[GCN OPS NOTE(09jul09): Per author's request, in the Subject line
the "090609" was changed to "090709".]
GCN Circular 9630
Subject
GRB 090709: Faulkes Telescope North Upper Limits
Date
2009-07-09T09:35:32Z (16 years ago)
From
Zach Cano at ARI/John Moores Liverpool <zec@astro.livjm.ac.uk>
GRB 090709: Faulkes Telescope North Upper Limits
Z. Cano (Liverpool JMU), A. Melandri, C. Guidorzi (U. Ferrara), D. Bersier,
I.A. Steele, R.J. Smith, C. Mundell (Liverpool JMU)
report, on behalf of a large collaboration:
Following Swift detection of burst (Morris et al. GCN Circ. 9625), Faulkes
Telescope North (Hawaii) reacted robotically and began observing the field
of GRB 090709 in BVRi bands starting at 07:41:27 UT.
We detect no new source within the XRT error circle:
t_exp t-T0(mid exposure) mag
30s 207 s R2 > 19.3
180s 457 s I > 18.3
The upper limits are determined against stars in the USNO B1 catalog.
GCN Circular 9632
Subject
GRB 090709 : planned Suzaku-ToO observation
Date
2009-07-09T13:01:58Z (16 years ago)
From
Kazutaka Yamaoka at Aoyama Gakuin U <yamaoka@phys.aoyama.ac.jp>
Kazuhisa Mitsuda on behalf of the Suzaku GRB-ToO team:
We will carry out a Suzaku-ToO observation of GRB 090709
(Morris et al., GCN 9625) at location (RA=289.9291, DEC=+60.7271,
J2000) with the narrow field instruments (the XIS and HXD).
It will start 13:00 UT on July 9, 2009, and
will continue until 21:32 UT on July 10, 2009.