| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB210323502 |
|
| T0 |
12:03:28.741 UTC |
Fermi_GBM |
| ra |
259.6667° |
IPN |
| decl |
15.6833° |
IPN |
| pos_error |
1.00e-01° |
IPN |
| T90 |
13.568 s |
Fermi_GBM |
| T90_error |
2.202 s |
Fermi_GBM |
| T90_start |
12:03:28.741 UTC |
Fermi_GBM |
| fluence |
5.86e-07 erg/cm² |
Fermi_GBM |
| fluence_error |
4.56e-08 erg/cm² |
Fermi_GBM |
| T100 |
13.568 s |
|
| GBM_located |
False |
|
| mjd |
59296.5024159838 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB210323502 |
| trigger_name |
bn210323502 |
| ra |
253.0800° |
| decl |
7.8200° |
| pos_error |
6.23e+00° |
| datum |
2021-03-23 |
| t_trigger |
12:03:33.093 UTC |
| T90 |
13.568 s |
| T90_error |
2.202 s |
| T90_start |
12:03:28.741 UTC |
| fluence |
5.86e-07 erg/cm² |
| fluence_error |
4.56e-08 erg/cm² |
| flux_1024 |
1.07e+00 erg/cm²/s |
| flux_1024_error |
1.92e-01 erg/cm²/s |
| flux_1024_time |
-4.48e+00 erg/cm²/s |
| flux_64 |
3.64e+00 erg/cm²/s |
| flux_64_error |
1.37e+00 erg/cm²/s |
| IPN table |
|---|
| GRB_name |
GRB210323B |
| ra |
259.6667° |
| decl |
15.6833° |
| pos_error |
1.00e-01° |
| GCN 29701 table |
|---|
| GRB_name |
GRB210323B |
| GCN_number |
29701 |
| Detection_method |
Swift Other |
| ra |
259.6640° |
| decl |
15.6770° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 29701
SUBJECT: GRB 210323B: Swift/BAT-GUANO detection and possible arcminute localization
DATE: 21/03/24 02:57:29 GMT
FROM: Aaron Tohuvavohu at U Toronto
James DeLaunay (PSU), Aaron Tohuvavohu (U Toronto), Jamie Kennea (PSU) report:
Swift/BAT did not trigger on GRB 210323B (T0: 2021-03-23 12:03:33 UTC,
Fermi/GBM TRIGGER 638193818).
The Fermi/GBM notice, distributed in near real-time triggered the
Swift Mission Operations Center operated Gamma-ray Urgent Archiver for
Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1).
Upon trigger by this notice, GUANO sent a command to the Swift Burst
Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from
[-50,+150] seconds around the time of the burst. All the requested
event mode data was delivered to the ground.
The burst is detected in BAT with a best fit duration of ~8 seconds.
With a maximum likelihood analysis (DeLaunay et al. 2021, in prep.) on
the event-mode data we detect a location for the burst with a square
root of the test statistic, sqrt(TS), of 11.77. The sqrt(TS) behaves
similarly to SNR.
This is a low significance detection and it could not be recovered
using the normal BAT imaging technique, so there is a chance that this
localization may be incorrect.
The BAT position is
RA, Dec = 259.664, +15.677 deg which is
RA(J2000) = 17h 18m 39.36s
Dec(J2000) = +15d 40' 37.20"
with an estimated uncertainty of 6 arcmin.
The partial coding was 10.6%
This position is consistent with the Fermi GBM localization.
XRT and UVOT follow-up has been requested. Results of follow-up
observations will be reported in future circulars.
GUANO is a fully autonomous, extremely low latency, spacecraft
commanding pipeline designed for targeted recovery of BAT event mode
data around the times of compelling astrophysical events to enable
more sensitive GRB searches.
A live reporting of Swift/BAT event data recovered by GUANO can be
found at: https://www.swift.psu.edu/guano/
|
| GCN 29714 table |
|---|
| GRB_name |
GRB210323B |
| GCN_number |
29714 |
| Detection_method |
Swift Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 29714
SUBJECT: GRB 210323B: Swift ToO observations
DATE: 21/03/24 16:48:22 GMT
FROM: Phil Evans at U of Leicester
P. A. Evans (U. Leicester) reports on behalf of the Swift team:
Swift has initiated a ToO observation of the Swift/BAT GRB 210323B.
Automated analysis of the XRT data will be presented online at
https://www.swift.ac.uk/ToO_GRBs/00021426
Any uncatalogued X-ray sources detected in this analysis will be
reported on this website and via GCN COUNTERPART notices. These are
not necessarily related to the Swift/BAT event. Any X-ray source
considered to be a probable afterglow candidate will be reported via a
GCN Circular after manual consideration.
Details of the XRT automated analysis methods are detailed in Evans et
al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).
This circular is an official product of the Swift-XRT team.
|
| GCN 29908 table |
|---|
| GRB_name |
GRB210323B |
| GCN_number |
29908 |
| Detection_method |
Swift-XRT Other |
| ra |
259.6867° |
| decl |
15.6339° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 29908
SUBJECT: GRB 210323B: Swift-XRT observations
DATE: 21/04/27 17:32:50 GMT
FROM: Aaron Tohuvavohu at U Toronto
M. Perri (SSDC & INAF-OAR), V. D'Elia (SSDC & INAF-OAR), A. D'Ai
(INAF-IASFPA), A. Tohuvavohu (U. Toronto), B. Sbarufatti (PSU), D.N.
Burrows (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester),
A.P. Beardmore (U. Leicester) and P.A. Evans (U. Leicester) report on
behalf of the Swift-XRT team:
Swift-XRT has performed follow-up observations of the
Swift/BAT-GUANO-detected burst GRB 210323B (James DeLaunay et al. GCN
Circ. 29701), collecting 10.2 ks of Photon Counting (PC) mode data
between T0+100.8 ks and T0+1300 ks.
One uncatalogued X-ray source has been detected consistent with being
within the Swift/BAT localization, it is below the RASS limit
and shows no definitive signs of fading. Therefore, at the present time
we cannot confirm this as the afterglow. Details of this source are
given below:
Source 1:
RA (J2000): 259.6867 = 17:18:44.80
Dec (J2000): +15.6339 = +15:38:02.2
Error: 4.6 arcsec (radius, 90% conf.)
Count-rate: (1.18 [+0.71, -0.52])e-3 ct s^-1
Distance: 173 arcsec from Swift/BAT position.
Seven uncatalogued sources were also detected too far from the GRB
position to be likely afterglow candidates.
The results of the XRT-team automatic analysis of the XRT observations,
including a position-specific upper limit calculator, are available at
https://www.swift.ac.uk/ToO_GRBs/00021426.
This circular is an official product of the Swift-XRT team.
|
| GCN 30241 table |
|---|
| GRB_name |
GRB210323B |
| GCN_number |
30241 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
12:03:33.090 UTC |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 30241
SUBJECT: GRB 210323B: Fermi GBM observation
DATE: 21/06/16 17:23:38 GMT
FROM: Elisabetta Bissaldi at INFN,Bari
E. Bissaldi (Politecnico and INFN Bari) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 12:03:33.09 UT on 23 March 2021, the Fermi Gamma-Ray Burst Monitor (GBM)
triggered and located GRB 210323B (trigger 638193818/ 210323502),
which was also detected by the Swift/BAT-GUANO (DeLaunay et al. 2021, GCN 29701).
The Fermi GBM Final Real-time Localization is consistent with the Swift position.
The angle from the Fermi LAT boresight
at the GBM trigger time is 10 degrees.
The GBM light curve consists of a weak emission episode
with a duration (T90) of about 14 s (50-300 keV).
The time-averaged spectrum from T0-4.9 s to T0+5.9 s is
adequately fit by a power law function with an exponential
high-energy cutoff. The power law index is -0.94 +/- 0.26 and
the cutoff energy, parameterized as Epeak, is 740 +/- 540 keV.
The event fluence (10-1000 keV) in this time interval is
(2.1 +/- 0.3)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0-4.5 s in the 10-1000 keV band
is 1.1 +/- 0.2 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/"
|