| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB240109168 |
|
| T0 |
4:01:35 UTC |
GCN_circulars,Swift Det |
| ra |
301.3300° |
Swift |
| decl |
16.5660° |
Swift |
| pos_error |
1.94e-02° |
Swift |
| T90 |
0.256 s |
Fermi_GBM |
| T90_error |
0.854 s |
Fermi_GBM |
| T90_start |
4:01:35.145 UTC |
Fermi_GBM |
| fluence |
9.52e-08 erg/cm² |
Fermi_GBM |
| fluence_error |
1.41e-08 erg/cm² |
Fermi_GBM |
| T100 |
0.401 s |
|
| GBM_located |
False |
|
| mjd |
60318.167766203704 |
GCN_circulars,Swift Det |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB240109168 |
| trigger_name |
bn240109168 |
| ra |
301.3179° |
| decl |
16.5781° |
| datum |
2024-01-09 |
| t_trigger |
4:01:35.209 UTC |
| T90 |
0.256 s |
| T90_error |
0.854 s |
| T90_start |
4:01:35.145 UTC |
| fluence |
9.52e-08 erg/cm² |
| fluence_error |
1.41e-08 erg/cm² |
| flux_1024 |
1.40e+00 erg/cm²/s |
| flux_1024_error |
2.15e-01 erg/cm²/s |
| flux_1024_time |
-7.68e-01 erg/cm²/s |
| flux_64 |
5.57e+00 erg/cm²/s |
| flux_64_error |
1.06e+00 erg/cm²/s |
| IPN table |
|---|
| GRB_name |
GRB240109A |
| ra |
301.3167° |
| decl |
16.5833° |
| pos_error |
5.00e-02° |
| Swift table |
|---|
| GRB_name |
GRB240109A |
| t_trigger |
4:01:35 UTC |
| ra |
301.3300° |
| decl |
16.5660° |
| pos_error |
1.94e-02° |
| T90 |
0.16 s |
| fluence |
1.20e-08 erg/cm² |
| GCN 35501 table |
|---|
| GRB_name |
GRB240109A |
| GCN_number |
35501 |
| Detection_method |
Swift Det |
| t_trigger |
4:01:35 UTC |
| ra |
301.3180° |
| decl |
16.5780° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 35501
SUBJECT: GRB 240109A: Swift detection of a short burst
DATE: 24/01/09 04:15:10 GMT
FROM: David Palmer at LANL
S. Dichiara (PSU), D. M. Palmer (LANL) and M. H. Siegel (PSU) report
on behalf of the Neil Gehrels Swift Observatory Team:
At 04:01:35 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 240109A (trigger=1207446). Due to a Sun constraint,
Swift did not slew immediately to the burst.
The BAT on-board calculated location is
RA, Dec 301.318, +16.578 which is
RA(J2000) = 20h 05m 16s
Dec(J2000) = +16d 34' 39"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a single spike
structure with a duration of about 0.25 sec. The peak count rate
was ~4000 counts/sec (15-350 keV), at ~0.1 sec after the trigger.
Due to a Sun observing constraint, Swift cannot slew to the BAT
position until 00:14 UT on 2024 March 01. There will thus be no XRT or
UVOT data for this trigger before this time.
Burst Advocate for this burst is S. Dichiara (sbd5667 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/)
|
| GCN 35519 table |
|---|
| GRB_name |
GRB240109A |
| GCN_number |
35519 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
4:01:35.210 UTC |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 35519
SUBJECT: GRB 240109A: Fermi GBM Observation
DATE: 24/01/11 20:28:52 GMT
FROM: Oliver J Roberts at USRA/NASA
O.J. Roberts (USRA/NASA-MSFC) and C. Meegan (UAH) report on behalf of
the Fermi Gamma-ray Burst Monitor Team:
"At 04:01:35.21 UT on 09 January 2024, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 240109A (trigger 726465700/240109168).
which was also detected by Swift-BAT (S. Dichiara et al. 2024, GCN 35501).
The Fermi GBM on-ground Localization is consistent with the Swift-BAT position.
The angle from the Fermi LAT boresight is 79 degrees using the Swift-BAT position.
The GBM light curve consists of a single peak with a duration (T90)
of about 0.26 s (50-300 keV). The time-averaged spectrum
from T0-0.12 to T0+0.12 s is best fit by
a power law function with an exponential high-energy cutoff.
The power law index is -1.0 +/- 0.3 and the cutoff energy,
parameterized as Epeak, is 305 +/- 179 keV.
The event fluence (10-1000 keV) in this time interval is
(1.6 +/- 0.4)E-07 erg/cm^2. The 0.064-sec peak photon flux measured
starting from T0-0.064 s in the 10-1000 keV band is 6 +/- 1 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog:
https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
For Fermi GBM data and info, please visit the official Fermi GBM Support Page:
https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/" |
| GCN 35523 table |
|---|
| GRB_name |
GRB240109A |
| GCN_number |
35523 |
| Detection_method |
Swift-BAT Det |
| ra |
301.3300° |
| decl |
16.5660° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 35523
SUBJECT: GRB 240109A: Swift-BAT refined analysis
DATE: 24/01/12 18:37:07 GMT
FROM: Sibasish Laha at GSFC
D. M. Palmer (LANL), S. D. Barthelmy (GSFC),
H. A. Krimm (NSF), S. Laha (GSFC/UMBC),
A. Y. Lien (U Tampa), C. B. Markwardt (GSFC),
M. J. Moss (GSFC), T. Parsotan (GSFC),
T. Sakamoto (AGU), M. Stamatikos (OSU)
(i.e. the Swift-BAT team):
Using the data set from T-61 to T+242 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 240109A (trigger #1207446)
(Dichiara et al., GCN Circ. 35501). The BAT ground-calculated position is
RA, Dec = 301.330, 16.566 deg which is
RA(J2000) = 20h 05m 19.1s
Dec(J2000) = +16d 33' 58.3"
with an uncertainty of 2.5 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 67%.
The BAT light curve shows a single peak with a duration ~0.5 sec.
T90 (15-350 keV) is 0.16 +- 0.06 sec (estimated error including systematics).
The time-averaged spectrum from T-0.04 to T+0.15 sec is better fit by a blackbody.
A simple power-law fit shows a photon index of 2.75 +-0.35 with a poor statistics (reduced chi2 of 1.9).
Instead, the black body fit shows the temperature of 12.2 +-1.3 keV
with a reasonable statistics (reduced chi2 of 1.2). So, the burst
prefers a soft spectrum. The fluence in the 15-150 keV band is 1.2 +- 0.4 x 10^-08 erg/cm2.
The 1-sec peak photon flux measured from T-0.44 sec in the 15-150 keV band
is 0.7 +- 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/1207446/BA/
|