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GRB 230204B

Time: 21:47:51
Trigger Number: MAXI
Burst Advocate:

BAT Data:

RA: a 197.581
13:10:19.4
Dec: a -21.752
-21:45:07.2
90% Error Radius: b n/a
T90: c n/a
Fluence: d n/a (n/a)
1s Peak Photon Flux: e n/a (n/a)
Photon Index: f n/a (n/a)

90% error in parentheses,
a J2000; b arcmin; c seconds; d 10-7 erg/cm2 (15-150 keV); e ph/cm2/sec (15-150 keV); f PL = simple power-law, CPL = cutoff power-law (15-150 keV)

XRT Data:

RA: a 13:10:34.58
Dec: a -21:42:58.9
90% Error Radius: b 7.4
Time to First Observation: c 80500
Early Flux: d n/a
11 Hour Flux: d 0.0426796896
24 Hour Flux: d 0.0302743014
Initial Temporal Index: -0.4402
Spectral Index (Gamma): 1.19597
Column Density (NH): e 1.040410106

Note: Please be aware that only the very basic temporal and spectral quantities are reported here. You are strongly encouraged to see the referenced GCN circulars for full details.
a J2000; b arcsec; c seconds; d 10-11 erg/cm2/s (0.3-10 keV); e 1021 cm-2

UVOT Data:

RA: a n/a
Dec: a n/a
90% Error Radius: b n/a
Time to First Observation: c 80000
V Magnitude: V>19.1
Other Filter Magnitudes: B>20.1
U>19.8
UVW1>20.1
UVM2>20.9
UVW2>20.7

a J2000; b arcsec; c seconds

Other Burst Info:

Redshift:
Host Galaxy:
Other Observatory Detections:

Comments:

XRT: The source is below the RASS limit but does not show definitive signs of fading. This is most likely the afterglow, given also the reported redshift of z=2.14 (Saccardi et al. GCN Circ. 33281) but further observations are required to assess for fading.
UVOT: no detection

References:

BAT:
XRT: GCN 33285; Evans et al., 2009, MNRAS, 397, 1177
UVOT: GCN 33292
Radio:
Redshift:
Host:
Other: GCN 33265 (MAXI)