| Summary table |
|---|
| Variable |
Value |
Source |
| T0 |
14:43:11 UTC |
Swift |
| ra |
33.5681° |
Swift |
| decl |
-22.0332° |
Swift |
| pos_error |
2.46e-04° |
Swift |
| GBM_located |
False |
|
| mjd |
60453.61332175926 |
Swift |
| IPN table |
|---|
| GRB_name |
GRB240523A |
| ra |
33.5667° |
| decl |
-22.0167° |
| pos_error |
5.00e-02° |
| Swift table |
|---|
| GRB_name |
GRB240523A |
| t_trigger |
14:43:11 UTC |
| ra |
33.5681° |
| decl |
-22.0332° |
| pos_error |
2.46e-04° |
| GCN 36537 table |
|---|
| GRB_name |
GRB240523A |
| GCN_number |
36537 |
| Detection_method |
Swift-XRT Det |
| ra |
33.5680° |
| decl |
-22.0334° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 36537
SUBJECT: GRB 240523A: Enhanced Swift-XRT position
DATE: 24/05/23 21:33:56 GMT
FROM: Phil Evans at U of Leicester
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester)
report on behalf of the Swift-XRT team.
Using 3015 s of XRT Photon Counting mode data and 7 UVOT
images for GRB 240523A, we find an astrometrically corrected X-ray
position (using the XRT-UVOT alignment and matching UVOT field sources
to the USNO-B1 catalogue): RA, Dec = 33.56798, -22.03336 which is equivalent
to:
RA (J2000): 02h 14m 16.31s
Dec (J2000): -22d 02' 00.1"
with an uncertainty of 2.1 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest
position can be viewed at http://www.swift.ac.uk/xrt_positions. Position
enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans
et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the
Swift-XRT team.
|
| GCN 36538 table |
|---|
| GRB_name |
GRB240523A |
| GCN_number |
36538 |
| Detection_method |
Swift-XRT Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 36538
SUBJECT: GRB 240523A: Swift-XRT refined Analysis
DATE: 24/05/24 00:30:09 GMT
FROM: Phil Evans at U of Leicester
R. Brivio (INAF-OAB), D.N. Burrows (PSU), J. D. Gropp (PSU), S.
Dichiara (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester),
A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAR) and P.A. Evans report on
behalf of the Swift-XRT team:
We have analysed 6.5 ks of XRT data for GRB 240523A, from 132 s to 27.6
ks after the BAT trigger. The data comprise 8 s in Windowed Timing
(WT) mode (taken while Swift was slewing), with the remainder in Photon
Counting (PC) mode.
The light curve can be modelled with a series of power-law decays. The
initial decay index is alpha=2.8 (+0.6, -0.4). At T+400 s the decay
flattens to an alpha of -0.4 (+0.3, -0.5) before breaking again at
T+2137 s to a final decay with index alpha=1.41 (+0.26, -0.24).
A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 2.06 (+0.24, -0.22). The
best-fitting absorption column is 1.1 (+0.6, -0.5) x 10^21 cm^-2, in
excess of the Galactic value of 1.6 x 10^20 cm^-2 (Willingale et al.
2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion
factor deduced from this spectrum is 3.3 x 10^-11 (4.2 x 10^-11) erg
cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 1.1 (+0.6, -0.5) x 10^21 cm^-2
Galactic foreground: 1.6 x 10^20 cm^-2
Excess significance: 2.9 sigma
Photon index: 2.06 (+0.24, -0.22)
If the light curve continues to decay with a power-law decay index of
1.41, the count rate at T+24 hours will be 2.0 x 10^-3 count s^-1,
corresponding to an observed (unabsorbed) 0.3-10 keV flux of 6.5 x
10^-14 (8.2 x 10^-14) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/01230423.
This circular is an official product of the Swift-XRT team.
|