| Summary table |
|---|
| Variable |
Value |
Source |
| T0 |
1:33:43 UTC |
GCN_circulars,Swift Det |
| ra |
172.9070° |
Swift |
| decl |
-16.1850° |
Swift |
| pos_error |
1.40e-02° |
Swift |
| T90 |
31.3 s |
Swift |
| T90_start |
1:33:43 UTC |
Swift |
| fluence |
1.30e-06 erg/cm² |
Swift |
| T100 |
31.3 s |
|
| GBM_located |
False |
|
| mjd |
55443.06508101852 |
GCN_circulars,Swift Det |
| IPN table |
|---|
| GRB_name |
GRB100904A |
| ra |
172.9208° |
| decl |
-16.2167° |
| pos_error |
5.00e-02° |
| Swift table |
|---|
| GRB_name |
GRB100904A |
| t_trigger |
1:33:43 UTC |
| ra |
172.9070° |
| decl |
-16.1850° |
| pos_error |
1.40e-02° |
| T90 |
31.3 s |
| fluence |
1.30e-06 erg/cm² |
| GCN 11203 table |
|---|
| GRB_name |
GRB100904A |
| GCN_number |
11203 |
| Detection_method |
Swift Det |
| t_trigger |
1:33:43 UTC |
| ra |
172.9190° |
| decl |
-16.2090° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 11203
SUBJECT: GRB 100904A: Swift detection of a burst
DATE: 10/09/04 01:42:08 GMT
FROM: David Palmer at LANL
T. N. Ukwatta (GSFC/GWU), W. H. Baumgartner (GSFC/UMBC),
D. N. Burrows (PSU), J. R. Cummings (NASA/UMBC),
P. A. Evans (U Leicester), J. M. Gelbord (PSU),
S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU),
N. P. M. Kuin (UCL-MSSL), K. L. Page (U Leicester),
D. M. Palmer (LANL), A. Rowlinson (U Leicester), M. H. Siegel (PSU)
and C. A. Swenson (PSU) report on behalf of the Swift Team:
At 01:33:43 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 100904A (trigger=433273). Due to the Sun constraint,
Swift could not slew to the burst.
The BAT on-board calculated location is
RA, Dec 172.919, -16.209 which is
RA(J2000) = 11h 31m 41s
Dec(J2000) = -16d 12' 31"
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 30 sec. The peak count rate
was ~1300 counts/sec (15-350 keV), during the second peak at
~2 sec after the trigger.
Due to the proximity of the burst to the Sun, Swift cannot slew to the BAT
position. The burst does not become observable by Swift until November 7th;
there will thus be no XRT or UVOT data for this trigger.
Burst Advocate for this burst is T. N. Ukwatta (tilan.ukwatta AT gmail.com).
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 11207 table |
|---|
| GRB_name |
GRB100904A |
| GCN_number |
11207 |
| Detection_method |
Swift-BAT Det |
| ra |
172.9070° |
| decl |
-16.1850° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 11207
SUBJECT: GRB 100904A: Swift-BAT refined analysis
DATE: 10/09/04 13:50:20 GMT
FROM: Tilan Ukwatta at GSFC/GWU
T. N. Ukwatta (GWU), S. D. Barthelmy (GSFC),
W. H. Baumgartner (GSFC/UMBC), 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), T. Sakamoto (GSFC/UMBC),
G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC),
(i.e. the Swift-BAT team):
Using the data set from T-61 to T+242 sec from the recent telemetry
downlink,
we report further analysis of BAT GRB 100904A (trigger #433273)
(Ukwatta, et al., GCN Circ. 11203). The BAT ground-calculated position is
RA, Dec = 172.907, -16.185 deg which is
RA(J2000) = 11h 31m 37.6s
Dec(J2000) = -16d 11' 05.5"
with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 30%.
The mask-weighted light curve shows two overlapping peaks. The first starts
around T-18 sec and peaks around T-13 sec. The second peaks around T+3 sec.
T90 (15-350 keV) is 31.3 +/- 7.9 sec (estimated error including
systematics).
The time-averaged spectrum from T-14.5 to T+23.0 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.67 +/- 0.16. The fluence in the 15-150 keV band is 1.3 +/- 0.1 x 10^-06
erg/cm2.
The 1-sec peak photon flux measured from T+2.29 sec in the 15-150 keV band
is 1.6 +/- 0.3 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/433273/BA/
|
| GCN 11217 table |
|---|
| GRB_name |
GRB100904A |
| GCN_number |
11217 |
| Detection_method |
Swift-BAT Det |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 11217
SUBJECT: GRB100904A: BOOTES-3 Upper Limit
DATE: 10/09/05 20:06:20 GMT
FROM: Juan Carlos Tello at IAA-CSIC
J.C. Tello, J. Gorosabel, A.J. Castro-Tirado (IAA-CSIC, Granada) P.
Kubanek (IAA-CSIC and IPL-UV) W. Allen (Vintage Lane Obs.), Ph. Yock
and Kuan-Yu Lin (Auckland Univ.), report on behalf of a larger collaboration:
"We have carried out observations of the Swift GRB 100904A
(Ukwatta et al. GCNC 11203) on Sep 4.2982 - 4.3145 UT (~5.98 hr after
the onset of the burst, mean observing time) with the 0.6m Yock-Allen
robotic telescope (BOOTES-3) located in Blenheim, New Zealand.
Observations were carried out at high airmass (~ 7).
We do not detect any optical source within the Swift-BAT refined analysis
error circle (Ukwatta et al. GCNC 11207).
The 3 sigma limiting magnitude of the co-added unfiltered image (Texp=16x60s)
is R ~ 18.0, using USNO-B1.0 as photometric reference."
[GCN OPS NOTE(06sep10): Per author's request, K-YL was added to the author list.]
|