K.L. Page (U. Leicester) for the Swift team
At 02:14:37.50 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 190331A (trigger=895813) (Page et al. GCN Circ. 24027). Swift did not slew immediately due to an observing constraint. At the time of the trigger, the initial BAT position was 30° from the Sun (1.3 hours East) and 85° from the 24%-illuminated Moon. Table 1 contains the best reported positions from Swift.
Table 2 is a summary of GCN Circulars about this GRB from observatories other than Swift.
Standard analysis products for this burst are available at https://gcn.gsfc.nasa.gov/swift_gnd_ana.html.
As reported by Palmer et al. (GCN Circ. 24030),
the BAT ground-calculated position is RA, Dec = 28.573, 27.635 deg which is RA(J2000) = 0
The mask-weighted light curve (Figure 1) shows a multi-peaked structure that starts at ~
The time-averaged spectrum from T-0.1 to T+4.5 s is best fit by a simple power-law model.
The power law index of the time-averaged spectrum is 1.24 ± 0.15.
The fluence in the 15-150 keV band is 4.5 ± 0.4 x 1
The results of the batgrbproduct analysis are available at https://gcn.gsfc.nasa.gov/notices_s/895813/BA/.
XRT refined results are not available.
UVOT results are not available.
Figure 1. The BAT
mask-weighted light curve in the four individual and total
energy bands. The units are counts
RA (J2000) | Dec (J2000) | Error | Note | Reference |
---|---|---|---|---|
0 |
+27°38'06.8" | 1.4' | BAT-refined | Palmer et al. GCN Circ. 24030 |
Band | Authors | GCN Circ. | Subject | Observatory | Notes |
---|---|---|---|---|---|
Gamma-ray | Poolakkil and Meegan | 24032 | Fermi GBM detection | Fermi GBM | Fluence=1.343±0.179x1 (2 |
Gamma-ray | Luo et al. | 24036 | Insight-HXMT/HE detection | Insight-HXMT |
April 2, 2019