| Summary table |
|---|
| Variable |
Value |
Source |
| T0 |
1:33:59 UTC |
GCN_circulars,Swift Det |
| ra |
103.5750° |
Swift |
| decl |
-0.1990° |
Swift |
| pos_error |
2.64e-02° |
Swift |
| fluence |
1.90e-07 erg/cm² |
Swift |
| GBM_located |
False |
|
| mjd |
57533.0652662037 |
GCN_circulars,Swift Det |
| IPN table |
|---|
| GRB_name |
GRB160525A |
| ra |
103.5292° |
| decl |
-0.1667° |
| pos_error |
5.00e-02° |
| Swift table |
|---|
| GRB_name |
GRB160525A |
| t_trigger |
1:33:59 UTC |
| ra |
103.5750° |
| decl |
-0.1990° |
| pos_error |
2.64e-02° |
| fluence |
1.90e-07 erg/cm² |
| GCN 19458 table |
|---|
| GRB_name |
GRB160525A |
| GCN_number |
19458 |
| Detection_method |
Swift Det |
| t_trigger |
1:33:59 UTC |
| ra |
103.5300° |
| decl |
-0.1730° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 19458
SUBJECT: GRB 160525A: Swift detection of a probable burst
DATE: 16/05/25 01:47:52 GMT
FROM: David Palmer at LANL
M. Stamatikos (OSU/NASA/GSFC), A. D'Ai (INAF-IASFPA),
C. Gronwall (PSU), A. Maselli (INAF-IASFPA) and D. M. Palmer (LANL)
report on behalf of the Swift Team:
At 01:33:59 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 160525A (trigger=687492). Swift could not slew to the
burst due to an observing constraint.
The BAT on-board calculated location is
RA, Dec 103.530, -0.173 which is
RA(J2000) = 06h 54m 07s
Dec(J2000) = -00d 10' 24"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). As is typical for an image trigger, there
is no obvious variation in the immediately available lightcurve.
Due to a Sun observing constraint, Swift cannot slew to the BAT
position until 12:15 UT on 2016 August 19. There will thus be no XRT or
UVOT data for this trigger before this time.
Although the observing constraint prevents a confirmation of
this untriggered event, its significance (7.2 sigma) makes
it most likely to be a real astrophysical event. A more
definite determination will require the full downlinked dataset.
Burst Advocate for this burst is M. Stamatikos (Michael.Stamatikos-1 AT 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 19461 table |
|---|
| GRB_name |
GRB160525A |
| GCN_number |
19461 |
| Detection_method |
Swift-BAT Det |
| ra |
103.5750° |
| decl |
-0.1990° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 19461
SUBJECT: GRB 160525A: Swift-BAT refined analysis
DATE: 16/05/25 12:09:38 GMT
FROM: Scott Barthelmy at NASA/GSFC
T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC),
N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC),
C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU),
(i.e. the Swift-BAT team):
Using the data set from T-239 to T+903 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 160525A (trigger #687492)
(Stamatikos, et al., GCN Circ. 19458). The BAT ground-calculated position is
RA, Dec = 103.575, -0.199 deg, which is
RA(J2000) = 06h 54m 17.9s
Dec(J2000) = -00d 11' 55.6"
with an uncertainty of 3.4 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 98%.
The mask-weighted light curve shows a weak peak starting at ~T+5 sec and
ending at ~T+65 sec.
The time-averaged spectrum from T+0.00 to T+64.00 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
2.58 +- 0.54. The fluence in the 15-150 keV band is 1.9 +- 0.7 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+0.00 sec in the 15-150 keV band
is 0.06 +- 0.02 ph/cm2/sec. All the quoted errors are at the 90% confidence
level.
Given the low significance of the peak in the image domain (5.2 sigma)
in the ground analysis and the lack of XRT data (Sun constrained),
it is not possible to know with certainty if this is a GRB, but it seems likely.
The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/687492/BA/
|