GRB 170903A

Time: 12:49:07
Trigger Number: 770528
Burst Advocate: Craig Markwardt

BAT Data:

RA: a 254.532
Dec: a 34.985
90% Error Radius: b 1.3
T90: c 29.2
Fluence: d 24 (2)
1s Peak Photon Flux: e 3.9 (0.5)
Photon Index: f 1.94, PL (0.12)

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 16:58:06.24
Dec: a 34:58:44.7
90% Error Radius: b 1.4
Time to First Observation: c 3117.48
Early Flux: d n/a
11 Hour Flux: d 0.170673356
24 Hour Flux: d 0.088446029
Initial Temporal Index: -0.02095
Spectral Index (Gamma): 2.20256
Column Density (NH): e 5.491716

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 n/a
Dec: a n/a
90% Error Radius: b n/a
Time to First Observation: c 3484
V Magnitude: V>1.7
Other Filter Magnitudes: B>20.5

a J2000; b arcsec; c seconds

Other Burst Info:

0.886 (GTC: emission from host)
Host Galaxy:
i-band (AB) = 23.17 (GTC)
Other Observatory Detections:
Fermi (GBM)


Due to an observing constraint, Swift did not slew until T0+49.5 minutes.
UVOT: no detection


BAT: GCN 21793; GCN 21796
XRT: GCN 21794; GCN 21797; GCN 21800; Evans et al., 2009, MNRAS, 397, 1177
UVOT: GCN 21806
Redshift: GCN 21799 (GTC)
Host: GCN 21799 (GTC)