J.D. Gropp (PSU) for the Swift team
At 10:00:43 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 190424A (trigger=900285) (Gropp et al. GCN Circ. 24163). Swift did not slew to the burst due to an observing constraint. At the time of the trigger, the initial BAT position was 18° from the Sun (1.2 hours East) and 136° from the 74%-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 Stamatikos et al. (GCN Circ. 24164),
the BAT ground-calculated position is RA, Dec = 48.693, 20.239 deg which is RA(J2000) = 0
The mask-weighted light curve (Figure 1) shows a single, fairly symmetrical pulse starting at T-2 seconds, peaking at T+2 s, and declining to background by T+12 s.
The spacecraft slewed away from the burst location at T+80 s.
The time-averaged spectrum from T-1.31 to T+12.04 s is best fit by a simple power-law model.
The power law index of the time-averaged spectrum is 1.45 ± 0.13.
The fluence in the 15-150 keV band is 1.2 ± 0.1 x 1
The results of the batgrbproduct analysis are available at https://gcn.gsfc.nasa.gov/notices_s/900285/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 |
+20°14'19.9" | 1.4' | BAT-refined | Stamatikos et al. GCN Circ. 24164 |
Band | Authors | GCN Circ. | Subject | Observatory | Notes |
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April 26, 2019