| Summary table |
|---|
| Variable |
Value |
Source |
| T0 |
6:47:29 UTC |
GCN_circulars,Swift Det |
| ra |
244.2560° |
Swift |
| decl |
-47.4350° |
Swift |
| pos_error |
1.40e-02° |
Swift |
| T90 |
3.62 s |
Swift |
| T90_start |
6:47:29 UTC |
Swift |
| fluence |
1.70e-07 erg/cm² |
Swift |
| T100 |
3.62 s |
|
| GBM_located |
False |
|
| mjd |
55860.28297453704 |
GCN_circulars,Swift Det |
| IPN table |
|---|
| GRB_name |
GRB111026A |
| ra |
244.2750° |
| decl |
-47.5000° |
| pos_error |
5.00e-02° |
| Swift table |
|---|
| GRB_name |
GRB111026A |
| t_trigger |
6:47:29 UTC |
| ra |
244.2560° |
| decl |
-47.4350° |
| pos_error |
1.40e-02° |
| T90 |
3.62 s |
| fluence |
1.70e-07 erg/cm² |
| GCN 12497 table |
|---|
| GRB_name |
GRB111026A |
| GCN_number |
12497 |
| Detection_method |
Swift Det |
| t_trigger |
6:47:29 UTC |
| ra |
244.2750° |
| decl |
-47.4950° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 12497
SUBJECT: GRB 111026A: Swift detection of a burst
DATE: 11/10/26 07:04:53 GMT
FROM: Wayne Baumgartner at GSFC
W. H. Baumgartner (GSFC/UMBC), V. D'Elia (ASDC),
P. A. Evans (U Leicester), C. Guidorzi (U Ferrara),
O. M. Littlejohns (U Leicester), C. J. Mountford (U Leicester) and
K. L. Page (U Leicester) report on behalf of the Swift Team:
At 06:47:29 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 111026A (trigger=506291). A pointing constraint prevented
Swift from slewing immediately to the burst.
The BAT on-board calculated location is
RA, Dec 244.275, -47.495 which is
RA(J2000) = 16h 17m 06s
Dec(J2000) = -47d 29' 41"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a double-peaked
structure with a duration of about 1.5 sec. The peak count rate
was ~2000 counts/sec (15-350 keV), at ~1 sec after the trigger.
Due to a Sun observing constraint, Swift cannot slew to the BAT
position until 14:29 UT on 2012 January 12. There will thus be no XRT
or UVOT data for this trigger before this time.
This burst is only two degrees off the Galactic plane and could be
a Galactic transient.
Burst Advocate for this burst is W. H. Baumgartner (wayne AT milkyway.gsfc.nasa.gov).
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 12507 table |
|---|
| GRB_name |
GRB111026A |
| GCN_number |
12507 |
| Detection_method |
Swift-BAT Det |
| ra |
244.2560° |
| decl |
-47.4350° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 12507
SUBJECT: GRB 111026A: Swift-BAT refined analysis
DATE: 11/10/29 20:00:17 GMT
FROM: Scott Barthelmy at NASA/GSFC
S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC),
N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC),
D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), M. Stamatikos (OSU),
T. N. Ukwatta (MSU)
(i.e. the Swift-BAT team):
Using the data set from T-240 to T+963 sec from telemetry downlinks,
we report further analysis of BAT GRB 111026A (trigger #506291)
(Baumgartner, et al., GCN Circ. 12497). The BAT ground-calculated position is
RA, Dec = 244.256, -47.435 deg, which is
RA(J2000) = 16h 17m 01.5s
Dec(J2000) = -47d 26' 05.1"
with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 100%.
The mask-weighted light curve shows a couple overlapping pulses starting
at ~T-0.5 and ending at ~T+4 sec. T90 (15-350 keV) is 3.62 +- 1.11 sec
(estimated error including systematics).
The time-averaged spectrum from T-0.09 to T+4.07 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.69 +- 0.21. The fluence in the 15-150 keV band is 1.7 +- 0.2 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+0.00 sec in the 15-150 keV band
is 1.1 +- 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/506291/BA/
|
| GCN 12512 table |
|---|
| GRB_name |
GRB111026A |
| GCN_number |
12512 |
| Detection_method |
Swift-BAT Det |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 12512
SUBJECT: GRB 111026A: spectral lag value inconclusive for a short burst
DATE: 11/10/30 18:13:02 GMT
FROM: Scott Barthelmy at NASA/GSFC
S. D. Barthelmy (GSFC), J. Norris (BSU), N. Gehrels (GSFC):
We report the spectral lag analysis for GRB 111026A (GCN Circ. 12497)
based on the BAT data. Using 64 ms binned light curves, the spectral
lag for 15-25 keV to 50-100 keV is 27 +32/-40 msec. This value
is not very constraining towards the shortness of this burst.
And further, the fact that the burst is longer in the 15-25 keV band
than in the higher energy band argues for a long burst assignment.
|