| Summary table |
|---|
| Variable |
Value |
Source |
| T0 |
15:26:35 UTC |
GCN_circulars,Swift Det |
| ra |
183.6090° |
Swift |
| decl |
25.0760° |
Swift |
| pos_error |
2.10e-02° |
Swift |
| T90 |
64.0 s |
Swift |
| T90_start |
15:26:35 UTC |
Swift |
| fluence |
4.50e-07 erg/cm² |
Swift |
| T100 |
64.0 s |
|
| GBM_located |
False |
|
| mjd |
57266.64346064815 |
GCN_circulars,Swift Det |
| IPN table |
|---|
| GRB_name |
GRB150901A |
| ra |
183.5875° |
| decl |
25.0333° |
| pos_error |
5.00e-02° |
| Swift table |
|---|
| GRB_name |
GRB150901A |
| t_trigger |
15:26:35 UTC |
| ra |
183.6090° |
| decl |
25.0760° |
| pos_error |
2.10e-02° |
| T90 |
64.0 s |
| fluence |
4.50e-07 erg/cm² |
| GCN 18225 table |
|---|
| GRB_name |
GRB150901A |
| GCN_number |
18225 |
| Detection_method |
Swift Det |
| t_trigger |
15:26:35 UTC |
| ra |
183.5860° |
| decl |
25.0380° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18225
SUBJECT: GRB 150901A: Swift detection of a burst
DATE: 15/09/01 15:40:23 GMT
FROM: Scott Barthelmy at NASA/GSFC
B. Sbarufatti (INAF-OAB/PSU), S. D. Barthelmy (GSFC),
J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA) and
T. N. Ukwatta (LANL) report on behalf of the Swift Team:
At 15:26:35 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 150901A (trigger=654042). Swift did not slew due Sun observing
constraint. The BAT on-board calculated location is
RA, Dec 183.586, +25.038, which is
RA(J2000) = 12h 14m 21s
Dec(J2000) = +25d 02' 19"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a single peak
with a duration of about 25 sec. The peak count rate
was ~700 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 00:01 UT on 2015 October 28. There will thus be no XRT
or UVOT data for this trigger before this time.
Burst Advocate for this burst is B. Sbarufatti (boris.sbarufatti AT brera.inaf.it).
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 18232 table |
|---|
| GRB_name |
GRB150901A |
| GCN_number |
18232 |
| Detection_method |
Swift-BAT Det |
| ra |
183.6090° |
| decl |
25.0760° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18232
SUBJECT: GRB 150901A, Swift-BAT refined analysis
DATE: 15/09/03 12:53:33 GMT
FROM: Amy Lien at GSFC
J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), N. Gehrels (GSFC),
H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),
D. M. Palmer (LANL), T. Sakamoto (AGU), B. Sbarufatti (INAF-OAB/PSU),
M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-254 to T+640 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 150901A (trigger #654042)
(Sbarufatti, et al., GCN Circ. 18225). The BAT ground-calculated position is
RA, Dec = 183.609, 25.076 deg which is
RA(J2000) = 12h 14m 26.1s
Dec(J2000) = +25d 04' 35.2"
with an uncertainty of 2.7 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 41%.
The mask-weighted light curve shows some weak emissions that start at
~ T-70 s, followed by the main structure with several overlapping pulses
from ~T0 to ~T+18 s. T90 (15-350 keV) is 64.0 +- 35.8 sec (estimated error
including systematics).
The time-averaged spectrum from T-61.8 to T+18.2 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
2.72 +- 0.53. The fluence in the 15-150 keV band is 4.5 +- 1.3 x 10^-7 erg/cm2.
The 1-s peak photon flux is unconstrained due to the weakness of the burst.
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/654042/BA/
|