E. Troja (NASA/GSFC/UMCP) for the Swift team
At 20:38:11 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 210102C (trigger=1015728) (Troja et al. GCN Circ. 29226). Swift did not slew due to an observing constraint. At the time of the trigger, the initial BAT position was 43° from the Sun (3.2 hours West) and 96° from the 86%-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. 29231),
the BAT ground-calculated position is RA, Dec = 235.747, -37.231 deg which is RA(J2000) = 1
The mask-weighted light curve (Figure 1) shows a double-peaked structure.
The first peak starts at ~T-2 s, peaks at ~
The time-averaged spectrum from T-2.07 to T+97.42 s is best fit by a simple power-law model.
The power law index of the time-averaged spectrum is 1.87 ± 0.08.
The fluence in the 15-150 keV band is 3.9 ± 0.2 x 1
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 |
-37°13'52.2" | 1.0' | BAT-refined | Markwardt et al. GCN Circ. 29231 |
Band | Authors | GCN Circ. | Subject | Observatory | Notes |
---|---|---|---|---|---|
Optical | Lipunov et al. | 29227 | Swift GRB 210102C: Global MASTER-Net observations report |
MASTER | |
Optical | Lipunov et al. | 29229 | Fermi GRB 210102C: Global MASTER-Net observations report |
MASTER | |
Gamma-ray | Poolakkil and Meegan | 29228 | Fermi GBM detection | Fermi GBM | Fluence=5.219±0.332x1 (5 |
January 4, 2021