Estimated redshift from machine learning (Ukwatta et al. 2016) - may take a few minutes to calcaulte
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
263.7524 -16.8411 0.0046 50.0 -4.7 22.8591 41.6 TRIG_01348587
------------------------------------------
Foreground time interval of the image:
-1.352 147.244 (delta_t = 148.596 [sec])
Background time interval of the image:
-239.464 -1.352 (delta_t = 238.112 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 5) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 6) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -1.352 sec. to 147.244 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35362 ( -0.0472579 0.0469911 )
Norm@50keV : 1.04960E-02 ( -0.000285578 0.000285183 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.73 using 59 PHA bins.
# Reduced chi-squared = 1.171 for 57 degrees of freedom
# Null hypothesis probability = 1.773745e-01
Photon flux (15-150 keV) in 148.6 sec: 1.26541 ( -0.0390716 0.0392139 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.52209e-05 ( -4.07718e-07 4.07806e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.352 sec. to 147.244 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00322 ( -0.201442 0.192958 )
Epeak [keV] : 170.495 ( -40.6879 128.239 )
Norm@50keV : 1.47927E-02 ( -0.00248919 0.00311606 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.83 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 56 degrees of freedom
# Null hypothesis probability = 4.439036e-01
Photon flux (15-150 keV) in 148.6 sec: 1.23697 ( -0.04154 0.04174 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.50547e-05 ( -4.225e-07 4.20984e-07 ) ergs/cm2
Band function
Time interval is from -1.352 sec. to 147.244 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.44595E-02 ( -0.697915 0.448288 )
beta : -1.45698 ( 1.4662 0.0874614 )
Epeak [keV] : 58.6442 ( -41.4684 166.416 )
Norm@50keV : 5.47217E-02 ( -0.041642 141.587 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.46 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 55 degrees of freedom
# Null hypothesis probability = 4.572725e-01
Photon flux (15-150 keV) in 148.6 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 19.9191 ( )
R^2/D10^2 : 5.59114E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 304.81 using 59 PHA bins.
# Reduced chi-squared = 5.3475 for 57 degrees of freedom
# Null hypothesis probability = 1.483063e-35
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.365e-07 3.388e-08
25- 50 3.162e-06 1.412e-07
50-150 9.295e-06 3.812e-07
15-150 1.309e-05 3.767e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 5.45889 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.020e-06 6.241e-08
25- 50 3.886e-06 1.278e-07
50-150 8.522e-06 2.526e-07
15-150 1.443e-05 4.399e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.53599 (-0.88793 0.9781)
R1^2/D10^2 : 0.581516 (-0.167129 0.253047)
kT2 [keV] : 31.3261 (-2.79049 3.77897)
R2^2/D10^2 : 9.72746E-03 (-0.00320991 0.00391828)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.406e-06 1.616e-07
25- 50 3.679e-06 2.274e-07
50-150 9.981e-06 7.073e-07
15-150 1.507e-05 8.842e-07
Peak spectrum fit
Power-law model
Time interval is from 103.940 sec. to 104.940 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07155 ( -0.112632 0.111132 )
Norm@50keV : 7.44127E-02 ( -0.00487818 0.00486268 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.18 using 59 PHA bins.
# Reduced chi-squared = 0.7750 for 57 degrees of freedom
# Null hypothesis probability = 8.927749e-01
Photon flux (15-150 keV) in 1 sec: 8.60916 ( -0.585389 0.586664 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.85211e-07 ( -5.32302e-08 5.33141e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 103.940 sec. to 104.940 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.926189 ( -0.436752 0.198836 )
Epeak [keV] : 450.545 ( -450.545 -450.545 )
Norm@50keV : 8.57778E-02 ( -0.0148697 0.0433445 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.81 using 59 PHA bins.
# Reduced chi-squared = 0.7822 for 56 degrees of freedom
# Null hypothesis probability = 8.818428e-01
Photon flux (15-150 keV) in 1 sec: 8.56171 ( -0.59232 0.59654 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.83659e-07 ( -5.3913e-08 5.3797e-08 ) ergs/cm2
Band function
Time interval is from 103.940 sec. to 104.940 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99999 ( -4.99999 -4.99999 )
beta : -1.08716 ( -0.116392 0.116484 )
Epeak [keV] : 23.6827 ( -23.6827 8.11063 )
Norm@50keV : 7296.69 ( -466.31 1.48175e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.90 using 59 PHA bins.
# Reduced chi-squared = 0.7981 for 55 degrees of freedom
# Null hypothesis probability = 8.587607e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 23.6248 (-2.04811 2.30387)
R^2/D10^2 : 0.243416 (-0.0619052 0.0814093)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.430e-08 3.290e-09
25- 50 1.338e-07 1.530e-08
50-150 5.571e-07 4.910e-08
15-150 7.152e-07 5.545e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-9.31298 -200)
Norm : 36.0938 (-2.408 2.408)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.990e-08 6.420e-09
25- 50 1.729e-07 1.490e-08
50-150 3.793e-07 1.045e-07
15-150 6.421e-07 1.129e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.31559 (-1.49672 1.84035)
R1^2/D10^2 : 5.74395 (-3.03663 7.39521)
kT2 [keV] : 33.8359 (-4.76684 7.35263)
R2^2/D10^2 : 6.97048E-02 (-0.0318693 0.0440583)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.314e-08 2.279e-08
25- 50 1.515e-07 4.092e-08
50-150 5.855e-07 1.162e-07
15-150 8.001e-07 1.429e-07
Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)
Power-law model
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35362 ( -0.0472579 0.0469911 )
Norm@50keV : 1.04960E-02 ( -0.000285578 0.000285183 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.73 using 59 PHA bins.
# Reduced chi-squared = 1.171 for 57 degrees of freedom
# Null hypothesis probability = 1.773745e-01
Photon flux (15-150 keV) in 148.6 sec: 1.26541 ( -0.0390716 0.0392139 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.52209e-05 ( -4.07718e-07 4.07806e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00322 ( -0.201442 0.192958 )
Epeak [keV] : 170.495 ( -40.6879 128.239 )
Norm@50keV : 1.47927E-02 ( -0.00248919 0.00311606 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.83 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 56 degrees of freedom
# Null hypothesis probability = 4.439036e-01
Photon flux (15-150 keV) in 148.6 sec: 1.23697 ( -0.04154 0.04174 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.50547e-05 ( -4.225e-07 4.20984e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.44595E-02 ( -0.697915 0.448288 )
beta : -1.45698 ( 1.4662 0.0874614 )
Epeak [keV] : 58.6442 ( -41.4684 166.416 )
Norm@50keV : 5.47217E-02 ( -0.041642 188.249 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.46 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 55 degrees of freedom
# Null hypothesis probability = 4.572725e-01
Photon flux (15-150 keV) in 148.6 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 3.49e-06
S(50-100 keV) = 5.46e-06
T90 vs. Hardness ratio plot
T90 = 128.419999957085 sec.
Hardness ratio (energy fluence ratio) = 1.56447
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.8839
Count Ratio (50-100 keV) / (15-25 keV) = 1.79128
Mask shadow pattern
IMX = 1.188697438754158E+00, IMY = 9.790651504474404E-02
TIME vs. PHA plot around the trigger time
TIME vs. DetID plot around the trigger time
100 us light curve (15-350 keV)
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image:
-239.464000 -1.352000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.6835 -62.8312 14.0 38.6 -112.6 0.7055 0.8 3.7 GX 301-2
244.9395 -15.5941 3.1 55.9 -26.2 5.2847 3.7 3.6 Sco X-1
255.9481 -37.7949 27.9 31.7 -24.0 0.1880 0.4 3.5 4U 1700-377
256.2857 -36.3155 6.5 33.0 -22.5 0.8218 1.8 9.7 GX 349+2
263.1255 -24.6068 7.5 42.5 -7.7 0.9315 1.5 10.5 GX 1+4
264.8765 -44.4581 8.8 23.1 -15.7 0.5336 1.3 5.7 4U 1735-44
270.2903 -25.0745 10.5 40.9 1.8 0.6234 1.1 0.4 GX 5-1
270.2996 -25.7310 32.9 40.2 1.6 0.1998 0.4 0.7 GRS 1758-258
274.0707 -13.9438 9.1 51.5 8.5 -1.2257 -1.3 6.7 GX 17+2
275.7823 -30.2421 15.2 35.1 8.5 0.3987 0.8 10.5 H1820-303
285.0366 -24.9022 54.8 40.1 22.4 0.1411 0.2 1.1 HT1900.1-2455
262.8731 -33.6951 33.2 33.8 -11.7 0.1646 0.3 10.2 GX 354-0
50.0406 -53.8113 3.6 54.3 164.8 5.8462 3.3 ------ UNKNOWN
45.7938 -58.8860 2.0 48.7 165.1 7.1471 5.8 ------ UNKNOWN
57.2856 -65.7452 2.5 45.0 175.8 3.9808 4.6 ------ UNKNOWN
260.9095 -34.3051 2.5 33.7 -14.8 2.0697 4.6 ------ UNKNOWN
131.8764 -60.1262 2.5 53.2 -142.2 8.7247 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.352000 147.244000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.5310 -62.8942 20.3 38.6 -112.7 -0.2900 -0.6 8.2 GX 301-2
244.9799 -15.6442 256.2 55.9 -26.2 0.0474 0.0 0.2 Sco X-1
256.0444 -37.9896 13.4 31.5 -24.0 0.2328 0.9 9.1 4U 1700-377
256.2865 -36.4523 8.0 32.9 -22.6 -0.4152 -1.4 7.4 GX 349+2
262.9938 -24.7382 34.4 42.4 -7.9 0.1326 0.3 0.9 GX 1+4
264.8105 -44.3632 5.4 23.2 -15.7 0.4743 2.1 6.0 4U 1735-44
270.2412 -24.9747 16.2 41.0 1.7 -0.2678 -0.7 6.7 GX 5-1
270.3926 -25.8163 10.6 40.1 1.7 -0.3908 -1.1 6.6 GRS 1758-258
274.0136 -14.0261 15.3 51.4 8.5 0.6189 0.8 0.8 GX 17+2
275.9213 -30.5211 6.7 34.8 8.7 0.5313 1.7 9.3 H1820-303
285.0155 -25.0780 4.9 39.9 22.3 0.9496 2.4 9.5 HT1900.1-2455
263.1376 -33.7602 7.9 33.7 -11.4 -0.4076 -1.4 8.6 GX 354-0
48.9374 -56.6469 2.2 51.4 165.6 4.5216 5.2 ------ UNKNOWN
278.2292 -69.7194 2.4 5.2 -136.9 1.0247 4.8 ------ UNKNOWN
263.7524 -16.8411 0.3 50.0 -4.7 22.8595 41.6 ------ UNKNOWN
252.8209 -24.9492 2.5 44.7 -20.9 1.7613 4.6 ------ UNKNOWN
131.8571 -66.9210 2.3 46.6 -144.5 2.1947 5.1 ------ UNKNOWN
221.2676 -39.6518 2.1 43.3 -65.0 4.7943 5.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
238.036590 818.136600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.0657 -60.6281 15.5 33.3 -64.8 0.9109 0.7 7.4 Cen X-3
186.8258 -62.6956 6.2 35.0 -50.5 2.2725 1.8 6.5 GX 301-2
79.2156 -23.0956 2.7 51.9 -179.4 12.2035 4.2 ------ UNKNOWN
246.7673 -63.5516 2.6 41.3 -8.8 5.4150 4.4 ------ UNKNOWN
109.5119 -75.2197 3.0 8.2 -74.7 2.9002 3.8 ------ UNKNOWN
Plot creation:
Fri Sep 12 06:03:11 EDT 2025