| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB210406949 |
|
| T0 |
22:46:05.228 UTC |
Fermi_GBM |
| ra |
6.5800° |
Fermi_GBM |
| decl |
19.5800° |
Fermi_GBM |
| pos_error |
4.48e+00° |
Fermi_GBM |
| T90 |
19.712 s |
Fermi_GBM |
| T90_error |
0.572 s |
Fermi_GBM |
| T90_start |
22:46:06.252 UTC |
Fermi_GBM |
| fluence |
2.57e-05 erg/cm² |
Fermi_GBM |
| fluence_error |
3.40e-08 erg/cm² |
Fermi_GBM |
| T100 |
20.736 s |
|
| GBM_located |
True |
|
| mjd |
59310.94867162037 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB210406949 |
| trigger_name |
bn210406949 |
| ra |
6.5800° |
| decl |
19.5800° |
| pos_error |
4.48e+00° |
| datum |
2021-04-06 |
| t_trigger |
22:46:05.228 UTC |
| T90 |
19.712 s |
| T90_error |
0.572 s |
| T90_start |
22:46:06.252 UTC |
| fluence |
2.57e-05 erg/cm² |
| fluence_error |
3.40e-08 erg/cm² |
| flux_1024 |
2.98e+01 erg/cm²/s |
| flux_1024_error |
4.44e-01 erg/cm²/s |
| flux_1024_time |
1.08e+01 erg/cm²/s |
| flux_64 |
3.23e+01 erg/cm²/s |
| flux_64_error |
1.84e+00 erg/cm²/s |
| GCN 29773 table |
|---|
| GRB_name |
GRB210406B |
| GCN_number |
29773 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
22:46:05.230 UTC |
| ra |
6.5800° |
| decl |
19.5800° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 29773
SUBJECT: GRB 210406B: Fermi GBM detection
DATE: 21/04/08 14:53:07 GMT
FROM: Christian Malacaria at NASA-MSFC/USRA
C. Malacaria (NASA-MSFC/USRA), O. Roberts (USRA) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 22:46:05.23 UT on 6 April 2021, the Fermi Gamma-Ray Burst Monitor (GBM)
triggered and located GRB 210406B (trigger 639441970 / 210406949).
The on-ground calculated location, using the GBM trigger
data, is RA = 6.58, DEC = 19.58 (J2000 degrees,
equivalent to 00 h 26 m, 19 d 34 '), with an uncertainty of 1.5 degrees
(radius, 1-sigma containment, statistical only; there is additionally a
systematic error which we have characterized as a mixture of two Gaussians,
one with a radius of 1.8 degrees (52% contribution) and one with a radius
of 4.1 degrees (47% contribution) [A. Goldstein et al. 2020, ApJ, 895, 1] ).
The angle from the Fermi LAT boresight at the GBM trigger time is 83 degrees.
The GBM light curve consists of a long GRB with three
distinct peaks and with a duration (T90) of about 20 s (50-300 keV).
The spectrum shows a marked hard to soft evolution throughout the burst.
The time-averaged spectrum from T0+1.5 s to T0+20.9 s is
best fit by a Band function with Epeak = 53.4 +/- 0.7 keV,
alpha = -1.16 +/- 0.02, and beta = -3.06 +/- 0.09 .
The event fluence (10-1000 keV) in this time interval is
(2.423 +/- 0.027)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+10.7 s in the 10-1000 keV band
is 29.7 +/- 0.4 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/"
|