| Summary table |
|---|
| Variable |
Value |
Source |
| T0 |
0:28:21 UTC |
Swift |
| ra |
341.9600° |
Swift |
| decl |
1.2940° |
Swift |
| pos_error |
2.56e-02° |
Swift |
| fluence |
1.30e-07 erg/cm² |
Swift |
| GBM_located |
False |
|
| mjd |
56548.0196875 |
Swift |
| IPN table |
|---|
| GRB_name |
GRB130913A |
| ra |
341.9583° |
| decl |
1.3000° |
| pos_error |
5.50e-02° |
| Swift table |
|---|
| GRB_name |
GRB130913A |
| t_trigger |
0:28:21 UTC |
| ra |
341.9600° |
| decl |
1.2940° |
| pos_error |
2.56e-02° |
| fluence |
1.30e-07 erg/cm² |
| GCN 15233 table |
|---|
| GRB_name |
GRB130913A |
| GCN_number |
15233 |
| Detection_method |
Swift-BAT Det |
| ra |
341.9600° |
| decl |
1.2940° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 15233
SUBJECT: GRB 130913A detected in ground analysis of Swift-BAT data
DATE: 13/09/19 18:34:54 GMT
FROM: Jay R. Cummings at NASA/GSFC/Swift
J. R. Cummings (UMBC@NASA GSFC), D. M. Palmer (LANL),
A. Y. Lien (NASA/GSFC/ORAU), and C. B. Markwardt (GSFC)
report on behalf of the Swift science team:
On 2013-09-13 at 00:28:21 Swift-BAT detected a preliminary rate trigger
(Trigger #570531), now designated GRB 130913A. On-board analysis was
terminated prematurely by a preplanned slew maneuver. No significant
source was found on-board. In post-processing on the ground, a
significant source was located at RA, Dec 341.960, +1.294, which is
RA(J2000) = 22h 47m 50.4s
Dec(J2000) = +01d 17' 38.0"
with an estimated 90% error radius of 3.3 arcmin.
The lightcurve shows a single FRED peak about 10 seconds long (T100).
Determining a formal T90 is difficult because of the weakness of the burst.
The time-averaged spectrum from T-2 to T+8 sec is fit by a simple
power law model. This fit gives a photon index of 0.9 +- 0.3 (68% confidence).
The fluence in the 15-150 keV band was (1.3 +- 0.4) x 10^-7 ergs/cm^2 (90%
confidence).
We note the presence of a galaxy cluster at z ~ 0.123 centered within 5
arcmin of the BAT position. The source went into Moon constraint for Swift
very shortly after discovery, so no TOO was possible, and there will be no
narrow-field instrument data for this GRB.
|