| Summary table |
|---|
| Variable |
Value |
Source |
| T0 |
2:57:46 UTC |
GCN_circulars,Swift Det |
| ra |
118.2036° |
Swift |
| decl |
-41.5845° |
Swift |
| pos_error |
4.92e-04° |
Swift |
| T90 |
13.0 s |
Swift |
| T90_start |
2:57:46 UTC |
Swift |
| fluence |
2.40e-07 erg/cm² |
Swift |
| T100 |
13.0 s |
|
| GBM_located |
False |
|
| mjd |
55874.123449074075 |
GCN_circulars,Swift Det |
| IPN table |
|---|
| GRB_name |
GRB111109A |
| ra |
118.1958° |
| decl |
-41.6000° |
| pos_error |
5.00e-02° |
| Swift table |
|---|
| GRB_name |
GRB111109A |
| t_trigger |
2:57:46 UTC |
| ra |
118.2036° |
| decl |
-41.5845° |
| pos_error |
4.92e-04° |
| T90 |
13.0 s |
| fluence |
2.40e-07 erg/cm² |
| GCN 12548 table |
|---|
| GRB_name |
GRB111109A |
| GCN_number |
12548 |
| Detection_method |
Swift Det |
| t_trigger |
2:57:46 UTC |
| ra |
118.1960° |
| decl |
-41.5990° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 12548
SUBJECT: GRB 111109A: Swift detection of a burst
DATE: 11/11/09 03:07:17 GMT
FROM: David Palmer at LANL
C. Pagani (U Leicester), S. D. Barthelmy (GSFC),
N. Gehrels (NASA/GSFC), J. A. Kennea (PSU),
C. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC),
K. L. Page (U Leicester), D. M. Palmer (LANL),
B. Sbarufatti (INAF-OAB/IASFPA), M. H. Siegel (PSU) and
T. N. Ukwatta (MSU) report on behalf of the Swift Team:
At 02:57:46 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 111109A (trigger=507342). Swift did not slew due an
observing constraint. The BAT on-board calculated location is
RA, Dec 118.196, -41.599, which is
RA(J2000) = 07h 52m 47s
Dec(J2000) = -41d 35' 54"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve shows a few peaks with a
total duration of about 20 sec. The peak count rate
was ~1500 counts/sec (15-350 keV), at ~1 sec after the trigger.
Due to an observing constraint, Swift will not slew until
T0+49.2 minutes. There will be no XRT or UVOT data until
this time.
Burst Advocate for this burst is C. Pagani (cp232 AT star.le.ac.uk).
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 12549 table |
|---|
| GRB_name |
GRB111109A |
| GCN_number |
12549 |
| Detection_method |
Swift-XRT Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 12549
SUBJECT: GRB 111109A: Swift-XRT observations
DATE: 11/11/09 04:24:11 GMT
FROM: Phil Evans at U of Leicester
D.N. Burrows (PSU), J.A. Kennea (PSU), M. Perri (ASDC), G. Tagliaferri
(INAF-OAB), P.A. Evans (U. Leicester) and J.P. Osborne (U. Leicester)
report on behalf of the Swift-XRT team:
The XRT began observing the field of GRB 111109A at 03:49:14.9 UT,
3088.9 seconds after the BAT trigger. No source was detected in 922 s
of promptly downlinked data. We are waiting for the full dataset to
detect and localise the XRT counterpart.
|
| GCN 12550 table |
|---|
| GRB_name |
GRB111109A |
| GCN_number |
12550 |
| Detection_method |
Swift-XRT Det |
| ra |
118.2028° |
| decl |
-41.5841° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 12550
SUBJECT: GRB 111109A: Enhanced Swift-XRT position
DATE: 11/11/09 08:36:22 GMT
FROM: Phil Evans at U of Leicester
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester)
report on behalf of the Swift-XRT team.
Using 2557 s of XRT Photon Counting mode data and 1 UVOT
images for GRB 111109A, 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 = 118.20283, -41.58413 which is equivalent
to:
RA (J2000): 07h 52m 48.68s
Dec (J2000): -41d 35' 02.9"
with an uncertainty of 2.4 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).
This circular was automatically generated, and is an official product of the
Swift-XRT team.
|
| GCN 12551 table |
|---|
| GRB_name |
GRB111109A |
| GCN_number |
12551 |
| Detection_method |
Swift-BAT Det |
| ra |
118.2480° |
| decl |
-41.5880° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 12551
SUBJECT: GRB 111109A: Swift-BAT refined analysis
DATE: 11/11/09 14:14:55 GMT
FROM: Scott Barthelmy at NASA/GSFC
W. H. Baumgartner (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC),
N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC),
C. Pagani (U Leicester), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC),
M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU)
(i.e. the Swift-BAT team):
Using the data set from T-240 to T+645 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 111109A (trigger #507342)
(Pagani, et al., GCN Circ. 12548). The BAT ground-calculated position is
RA, Dec = 118.248, -41.588 deg, which is
RA(J2000) = 07h 52m 59.5s
Dec(J2000) = -41d 35' 18.3"
with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 91%.
The mask-weighted light curve shows a couple overlapping peaks starting
at ~T-5 sec, peaking at ~T+2 sec, and ending at ~T+20 sec. There is a
hint of possible precursor activity (~2 sigma) at ~T-110 sec. We note
that the burst location went out of the BAT FoV at ~T+120 sec (a slew
due to an observing constraint). T90 (15-350 keV) is 13.0 +- 3.2 sec
(estimated error including systematics).
The time-averaged spectrum from T-5.60 to T+8.40 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.86 +- 0.26. The fluence in the 15-150 keV band is 2.4 +- 0.4 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+1.40 sec in the 15-150 keV band
is 0.5 +- 0.1 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/507342/BA/
|
| GCN 12552 table |
|---|
| GRB_name |
GRB111109A |
| GCN_number |
12552 |
| Detection_method |
Swift-UVOT Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 12552
SUBJECT: GRB 111109A: Swift/UVOT Photometry
DATE: 11/11/09 20:13:32 GMT
FROM: Stephen Holland at USRA/NASA/GSFC/SSC
S. T. Holland (CRESST/USRA/GSFC) and
C. Pagani (U Leicester)
report on behalf of the Swift/UVOT team:
The Swift/UVOT observed the field of GRB 111109A starting 3074 s
after the BAT trigger (Pagani et al., 2011, GCNC 12548). Settled
observations started at 3095 s. The USNO-B1.0 source 0484-0114145 is
seen in the UVOT-enhanced XRT error circle (Beardmore et al., 2011,
GCNC 12550). Our preliminary photometry suggests that this source
did not vary during the UVOT observations. We note that the
position listed in the GCN/SWIFT_POSITION_NOTICE dated Wed 09 Nov 11
03:56:21 UT is incorrect due to it being inconsistent with the XRT
position, and the presence of a nearby high proper motion star.
|
| GCN 12553 table |
|---|
| GRB_name |
GRB111109A |
| GCN_number |
12553 |
| Detection_method |
Swift-XRT Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 12553
SUBJECT: GRB 111109A: Swift-XRT refined Analysis
DATE: 11/11/09 23:04:22 GMT
FROM: Claudio Pagani at U of Leicester
C. Pagani (U Leicester) reports on behalf of the Swift-XRT team:
We have analysed 10 ks of XRT data for GRB 111109A (Pagani et al. GCN
Circ. 12548), from 3.1 ks to 51.8 ks after the BAT trigger. The data
are entirely in Photon Counting (PC) mode. The enhanced XRT position
for this burst was given by Beardmore et al. (GCN. Circ 12550).
The light curve can be modelled with a power-law decay with a decay
index of alpha=0.5 (+/-0.3).
A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 3.0 (+0.8, -0.7). The
best-fitting absorption column is 6.1 (+3.1, -2.9) x 10^21 cm^-2, in
excess of the Galactic value of 3.2 x 10^21 cm^-2 (Kalberla et al.
2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion
factor deduced from this spectrum is 3.1 x 10^-11 (1.5 x 10^-10) erg
cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 6.1 (+3.1, -2.9) x 10^21 cm^-2
Galactic foreground: 3.2 x 10^21 cm^-2
Excess significance: 3.5 sigma
Photon index: 3.0 (+0.8, -0.7)
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00507342.
This circular is an official product of the Swift-XRT team.
|