| Summary table |
|---|
| Variable |
Value |
Source |
| T0 |
21:56:09 UTC |
GCN_circulars,Swift Det |
| ra |
143.4340° |
Swift |
| decl |
-17.3480° |
Swift |
| pos_error |
1.16e-02° |
Swift |
| T90 |
48.5 s |
Swift |
| T90_start |
21:56:09 UTC |
Swift |
| fluence |
8.60e-07 erg/cm² |
Swift |
| T100 |
48.5 s |
|
| GBM_located |
False |
|
| mjd |
57972.913993055554 |
GCN_circulars,Swift Det |
| IPN table |
|---|
| GRB_name |
GRB170807A |
| ra |
143.3792° |
| decl |
-17.3333° |
| pos_error |
5.00e-02° |
| Swift table |
|---|
| GRB_name |
GRB170807A |
| t_trigger |
21:56:09 UTC |
| ra |
143.4340° |
| decl |
-17.3480° |
| pos_error |
1.16e-02° |
| T90 |
48.5 s |
| fluence |
8.60e-07 erg/cm² |
| GCN 21420 table |
|---|
| GRB_name |
GRB170807A |
| GCN_number |
21420 |
| Detection_method |
Swift Det |
| t_trigger |
21:56:09 UTC |
| ra |
143.3790° |
| decl |
-17.3290° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 21420
SUBJECT: GRB 170807A: Swift detection of a burst
DATE: 17/08/07 22:08:20 GMT
FROM: David Palmer at LANL
J.D. Gropp (PSU), S. D. Barthelmy (GSFC), D. M. Palmer (LANL),
B. Sbarufatti (INAF-OAB/PSU) and A. Tohuvavohu (PSU) report on behalf
of the Swift Team:
At 21:56:09 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 170807A (trigger=766821). Swift could not slew to the
burst due to a Sun constraint. The BAT on-board calculated location is
RA, Dec 143.379, -17.329 which is
RA(J2000) = 09h 33m 31s
Dec(J2000) = -17d 19' 44"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed two FRED
structures with a total duration of about 40 sec. The peak count rate
was ~2500 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 06:56 UT on 2017 October 03. There will thus be no XRT
or UVOT data for this trigger before this time.
Burst Advocate for this burst is J.D. Gropp (jdg44 AT 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 21423 table |
|---|
| GRB_name |
GRB170807A |
| GCN_number |
21423 |
| Detection_method |
Swift-BAT Det |
| ra |
143.4340° |
| decl |
-17.3480° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 21423
SUBJECT: GRB 170807A: Swift-BAT refined analysis
DATE: 17/08/08 12:40:58 GMT
FROM: Amy Lien at GSFC
A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC),
J. R. Cummings (CPI), J. D. Gropp (PSU),
H. A. Krimm (NSF/USRA), C. B. Markwardt (GSFC),
D. M. Palmer (LANL), T. Sakamoto (AGU),
M. Stamatikos (OSU), T. N. Ukwatta (LANL)
(i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 170807A (trigger #766821)
(Gropp et al., GCN Circ. 21420). The BAT ground-calculated position is
RA, Dec = 143.434, -17.348 deg which is
RA(J2000) = 09h 33m 44.2s
Dec(J2000) = -17d 20' 51.9"
with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 92%.
The mask-weighted light curve shows a multi-peaked structure that starts at
~T0 and ends at ~T+50 s. The two main peaks occur at ~T+1 s and ~T+30 s,
respectively. T90 (15-350 keV) is 48.5 +- 11.7 sec (estimated error including systematics).
The time-averaged spectrum from T-0.42 to T+53.08 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.82 +- 0.15. The fluence in the 15-150 keV band is 8.6 +- 0.8 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+0.73 sec in the 15-150 keV band
is 1.4 +- 0.2 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/766821/BA/
|