| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB200903031 |
|
| T0 |
0:44:13.874 UTC |
Fermi_GBM |
| ra |
164.3130° |
Swift |
| decl |
50.4880° |
Swift |
| pos_error |
7.77e-03° |
Swift |
| T90 |
26.881 s |
Fermi_GBM |
| T90_error |
4.375 s |
Fermi_GBM |
| T90_start |
0:44:13.874 UTC |
Fermi_GBM |
| fluence |
5.26e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
3.83e-08 erg/cm² |
Fermi_GBM |
| T100 |
32.276 s |
|
| GBM_located |
False |
|
| mjd |
59095.03071613426 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB200903031 |
| trigger_name |
bn200903031 |
| ra |
164.3108° |
| decl |
50.5011° |
| pos_error |
3.03e+00° |
| datum |
2020-09-03 |
| t_trigger |
0:44:19.250 UTC |
| T90 |
26.881 s |
| T90_error |
4.375 s |
| T90_start |
0:44:13.874 UTC |
| fluence |
5.26e-06 erg/cm² |
| fluence_error |
3.83e-08 erg/cm² |
| flux_1024 |
6.03e+00 erg/cm²/s |
| flux_1024_error |
2.45e-01 erg/cm²/s |
| flux_1024_time |
3.33e+00 erg/cm²/s |
| flux_64 |
8.30e+00 erg/cm²/s |
| flux_64_error |
1.01e+00 erg/cm²/s |
| IPN table |
|---|
| GRB_name |
GRB200903A |
| ra |
164.3125° |
| decl |
50.5000° |
| pos_error |
5.00e-02° |
| Swift table |
|---|
| GRB_name |
GRB200903A |
| t_trigger |
0:44:22 UTC |
| ra |
164.3130° |
| decl |
50.4880° |
| pos_error |
7.77e-03° |
| T90 |
24.15 s |
| fluence |
2.80e-06 erg/cm² |
| GCN 28349 table |
|---|
| GRB_name |
GRB200903A |
| GCN_number |
28349 |
| Detection_method |
Fermi GBM final loc |
| t_trigger |
0:44:19 UTC |
| ra |
159.0000° |
| decl |
54.9000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 28349
SUBJECT: GRB 200903A: Fermi GBM Final Real-time Localization
DATE: 20/09/03 00:55:04 GMT
FROM: Fermi GBM Team at MSFC/Fermi-GBM
The Fermi GBM team reports the detection of a likely LONG GRB
At 00:44:19 UT on 3 Sep 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200903A (trigger 620786664.250206 / 200903031).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 159.0, Dec = 54.9 (J2000 degrees, equivalent to J2000 10h 35m, 54d 53'), with a statistical uncertainty of 3.6 degrees.
The angle from the Fermi LAT boresight is 58.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200903031/quicklook/glg_skymap_all_bn200903031.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200903031/quicklook/glg_healpix_all_bn200903031.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200903031/quicklook/glg_lc_medres34_bn200903031.gif
|
| GCN 28350 table |
|---|
| GRB_name |
GRB200903A |
| GCN_number |
28350 |
| Detection_method |
Swift Det |
| t_trigger |
0:44:22 UTC |
| ra |
164.3110° |
| decl |
50.5010° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 28350
SUBJECT: GRB 200903A: Swift detection of a burst
DATE: 20/09/03 01:06:11 GMT
FROM: David Palmer at LANL
A. P. Beardmore (U Leicester), J.D. Gropp (PSU),
A. Y. Lien (GSFC/UMBC), M. J. Moss (GWU), K. L. Page (U Leicester) and
D. M. Palmer (LANL) report on behalf of the Neil Gehrels Swift
Observatory Team:
At 00:44:22 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 200903A (trigger=994389). Swift did not slew immediately
due to an observing constraint.
The BAT on-board calculated location is
RA, Dec 164.311, +50.501 which is
RA(J2000) = 10h 57m 15s
Dec(J2000) = +50d 30' 02"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a multi-peaked
structure with a duration of about 30 sec. The peak count rate
was ~5000 counts/sec (15-350 keV), at ~0 sec after the trigger.
Due to a Sun observing constraint, Swift cannot slew to the BAT
position until 14:33 UT on 2020 September 12. There will thus be no XRT
or UVOT data for this trigger before this time.
Burst Advocate for this burst is A. P. Beardmore (apb AT star.le.ac.uk).
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 28357 table |
|---|
| GRB_name |
GRB200903A |
| GCN_number |
28357 |
| Detection_method |
CALET |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 28357
SUBJECT: GRB 200903A: CALET Gamma-Ray Burst Monitor detection
DATE: 20/09/03 12:06:27 GMT
FROM: Valentin Pal'shin at AGU
Y. Shimizu (Kanagawa U),
A. Yoshida, T. Sakamoto, V. Pal'shin, S. Sugita (AGU),
Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN),
Y. Asaoka (ICRR), S. Torii, Y. Akaike, K. Kobayashi (Waseda U),
T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC), M. L. Cherry (LSU),
S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena),
and the CALET collaboration:
The long soft GRB 200903A (Swift detection: Beardmore et al.,
GCN Circ. 28350; https://gcn.gsfc.nasa.gov/other/200903A.gcn3)
triggered the CALET Gamma-ray Burst Monitor (CGBM) at 00:44:17.477 UTC
on 3 September 2020 (http://cgbm.calet.jp/cgbm_trigger/flight/1283129005/).
The burst signal was seen by all CGBM detectors.
The burst light curve shows a multi-peaked structure which starts
at T+1.5 sec, peaks at T+5.9 sec, and ends at T+10.5 sec.
The T90 and T50 durations measured by the SGM data are 8.2 +- 0.8 sec
and 4.2 +- 0.8 sec (40-1000 keV), respectively.
The ground processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1283129005/
The CALET data used in this analysis are provided by
the Waseda CALET Operation Center located at the Waseda University.
|
| GCN 28360 table |
|---|
| GRB_name |
GRB200903A |
| GCN_number |
28360 |
| Detection_method |
Swift-BAT Det |
| ra |
164.3130° |
| decl |
50.4880° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 28360
SUBJECT: GRB 200903A: Swift-BAT refined analysis
DATE: 20/09/03 18:48:09 GMT
FROM: Amy Lien at GSFC
T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC),
A. P. Beardmore (U Leicester), J. R. Cummings (CPI),
H. A. Krimm (NSF), S. Laha (GSFC/UMBC),
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+963 sec from the recent telemetry
downlink, we report further analysis of BAT GRB 200903A (trigger #994389)
(Beardmore et al., GCN Circ. 28350). The BAT ground-calculated position is
RA, Dec = 164.313, 50.488 deg which is
RA(J2000) = 10h 57m 15.1s
Dec(J2000) = +50d 29' 15.7"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 67%.
The mask-weighted light curve shows a precursor at ~T-19 s, followed by the
main structure with several overlapping pulses that starts at ~T-5 s and
ends at ~T+20 s. The burst went out of the BAT FOV at T+64 s.
T90 (15-350 keV) is 24.15 +- 7.68 sec (estimated error including
systematics).
The time-averaged spectrum from T-19.18 to T+22.13 sec is best fit by a
power
law with an exponential cutoff. This fit gives a photon index 1.15 +-
0.28,
and Epeak of 107.4 +- 65.8 keV (chi squared 45.20 for 56 d.o.f.). For this
model the total fluence in the 15-150 keV band is 2.8 +- 0.1 x 10^-6 erg/cm2
and the 1-sec peak flux measured from T+0.14 sec in the 15-150 keV band is
3.8 +- 0.3 ph/cm2/sec. A fit to a simple power law gives a photon index
of 1.56 +- 0.07 (chi squared 51.88 for 57 d.o.f.). 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/994389/BA/
|
| GCN 28362 table |
|---|
| GRB_name |
GRB200903A |
| GCN_number |
28362 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
0:44:19.250 UTC |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 28362
SUBJECT: GRB 200903A: Fermi GBM detection
DATE: 20/09/04 00:48:15 GMT
FROM: Stephen Lesage at Fermi-GBM Team
S. Lesage (UAH) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 00:44:19.25 UT on 3 September 2020, the Fermi Gamma-Ray Burst Monitor
(GBM)
triggered and located GRB 200903A (trigger 620786664 / 200903031)
which was also detected by the Swift/BAT (A. P. Beardmore et al. 2020, GCN
28350).
The Fermi GBM Final Real-time Localization (GCN 28349) is consistent with
the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is ~61
degrees.
The GBM light curve shows a single bright peak
with a duration (T90) of about 26.9 s (50-300 keV).
The time-averaged spectrum from T0-5.4 s to T0+21.5 s is
best fit by a power law function with an exponential
high-energy cutoff. The power law index is -0.9 +/- 0.1 and
the cutoff energy, parameterized as Epeak, is 111.4 +/- 8.9 keV.
The event fluence (10-1000 keV) in this time interval is
(4.6 +/- 0.2)E-06 erg/cm^2. The 1.024-sec peak photon flux measured
starting from T0+3.3 s in the 10-1000 keV band
is 6.03 +/- 0.24 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/"
|