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GRB 170531B

Time: 22:02:09
Trigger Number: 755354
Burst Advocate: Phil Evans

BAT Data:

RA: a 286.901
19:07:36.2
Dec: a -16.414
-16:24:50.4
90% Error Radius: b 1.5
T90: c 164.13
Fluence: d 20 (2)
1s Peak Photon Flux: e 0.8 (0.2)
Photon Index: f 1.95, PL (0.14)

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 19:07:32.09
Dec: a -16:25:07.9
90% Error Radius: b 1.4
Time to First Observation: c 140.90
Early Flux: d 273
11 Hour Flux: d 0.03914964
24 Hour Flux: d 0.02130491
Initial Temporal Index: -0.7799
Spectral Index (Gamma): 2.06685
Column Density (NH): e 0.00000000000431107

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

» XRT GRB Live Catalogue
» XRT Light Curves
» XRT Spectra

UVOT Data:

RA: a 19:07:32.10
Dec: a -16:25:05.8
90% Error Radius: b 0.1
Time to First Observation: c 152
V Magnitude: V>18.88
Other Filter Magnitudes: B>19.77
U>19.17
UVW1>18.91
UVM2>18.88
UVW2>19.14
White>21.03
White_fc=20.50

a J2000; b arcsec; c seconds

Other Burst Info:

Redshift:
2.366 (GTC: absorption)
Consistent with GTC results (WHT)
Host Galaxy:
Other Observatory Detections:
MASTER-Kislovodsk, CrAO (Zeiss-1000), GTC (10.4m), MPG (2.2m), ISON/Terskol (0.8m), WHT (4.2m)

Comments:

References:

BAT: GCN 21171; GCN 21186
XRT: GCN 21171; GCN 21175; GCN 21182; Evans et al., 2009, MNRAS, 397, 1177
UVOT: GCN 21171; GCN 21188
Radio:
Redshift: GCN 21177 (GTC); GCN 21209 (WHT)
Host:
Other: