A.Y. Lien (GSFC/UMBC) for the Swift team
At 04:19:22 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 181123A (trigger=873178) (Lien et al. GCN Circ. 23431). Swift could not slew to the burst due to an observing constraint. At the time of the trigger, the initial BAT position was 46° from the Sun (3.1 hours East) and 134° from the 100%-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 Markwardt et al. (GCN Circ. 23442),
the BAT ground-calculated position is RA, Dec = 284.753, -8.208 deg which is RA(J2000) = 1
The mask-weighted light curve (Figure 1) shows some weak emission that starts at ~ T-60 s and ends at ~T+190 s.
The time-averaged spectrum from T-61.3 to T+187.4 s is best fit by a simple power-law model.
The power law index of the time-averaged spectrum is 2.88 ± 0.31.
The fluence in the 15-150 keV band is 9.9 ± 1.6 x 1
The results of the batgrbproduct analysis are available at https://gcn.gsfc.nasa.gov/notices_s/873178/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 |
---|---|---|---|---|
1 |
-08°14'14.3" | 2.3' | BAT-refined | Markwardt et al. GCN Circ. 23442 |
Band | Authors | GCN Circ. | Subject | Observatory | Notes |
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November 25, 2018