Estimated redshift from machine learning (Ukwatta et al. 2016) - may take a few minute to calcaulte
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
263.7524 -16.8413 0.0046 50.0227 -4.7085 22.9651499 41.271 TRIG_01348587
Foreground time interval of the image:
-1.352 149.508 (delta_t = 150.860 [sec])
Background time interval of the image:
-239.464 -1.352 (delta_t = 238.112 [sec])
Lightcurves
Notes:
- 1) The mask-weighted light curves are using the flight position.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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)
Quad-rate summed light curves (from T0-300s to T0+1000s)
Spectral Evolution
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using 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.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from -1.352 sec. to 149.508 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36435 ( -0.0473241 0.0470702 )
Norm@50keV : 1.03999E-02 ( -0.000282949 0.000282585 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 67.17 using 59 bins.
Reduced chi-squared = 1.17842
# Null hypothesis probability of 1.68e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 150.9 sec: 1.25667 ( -0.03886 0.039 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.52806e-05 ( -4.09961e-07 4.10363e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.352 sec. to 149.508 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00266 ( -0.202778 0.19419 )
Epeak [keV] : 164.921 ( -38.1501 115.412 )
Norm@50keV : 1.48296E-02 ( -0.00251382 0.00315306 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 56.74 using 59 bins.
Reduced chi-squared = 1.01321
# Null hypothesis probability of 4.47e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 150.9 sec: 1.22739 ( -0.04137 0.04159 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.50966e-05 ( -4.2498e-07 4.23987e-07 ) ergs/cm2
Band function
Time interval is from -1.352 sec. to 149.508 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 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] : 19.7683 ( )
R^2/D10^2 : 5.67786E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 301.91 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.88e-35 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.484e-07 3.410e-08
25- 50 3.205e-06 1.411e-07
50-150 9.269e-06 3.644e-07
15-150 1.312e-05 3.750e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 5.40799 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 125.51 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.62e-07 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.032e-06 6.187e-08
25- 50 3.909e-06 1.237e-07
50-150 8.573e-06 2.641e-07
15-150 1.451e-05 4.369e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.45653 (-0.896879 0.987854)
R1^2/D10^2 : 0.594433 (-0.174135 0.266555)
kT2 [keV] : 30.8504 (-2.72762 3.69504)
R2^2/D10^2 : 1.00933E-02 (-0.0033421 0.00407042)
------------------------------------------------------------
#Fit statistic : Chi-Squared 56.81 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.08e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.428e-06 1.440e-07
25- 50 3.708e-06 2.301e-07
50-150 9.970e-06 6.338e-07
15-150 1.511e-05 9.077e-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: 1.07445 ( -0.112596 0.111133 )
Norm@50keV : 7.42922E-02 ( -0.00487429 0.00485928 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 44.89 using 59 bins.
Reduced chi-squared = 0.787544
# Null hypothesis probability of 8.78e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 8.59733 ( -0.58529 0.58657 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.83285e-07 ( -5.31553e-08 5.32613e-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: 0.912860 ( -0.438648 0.215142 )
Epeak [keV] : 410.340 ( -410.326 -410.326 )
Norm@50keV : 8.70048E-02 ( -0.0233311 0.04421 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 44.43 using 59 bins.
Reduced chi-squared = 0.793393
# Null hypothesis probability of 8.68e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 8.54507 ( -0.59896 0.59949 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.8107e-07 ( -5.37928e-08 5.37445e-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 : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 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] : 23.5684 (-2.03908 2.2919)
R^2/D10^2 : 0.244912 (-0.0622198 0.0817514)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 91.83 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.36e-03 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.436e-08 3.075e-09
25- 50 1.340e-07 1.515e-08
50-150 5.552e-07 5.295e-08
15-150 7.135e-07 5.975e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-9.36544 -200)
Norm : 36.0438 (-2.40731 2.40731)
------------------------------------------------------------
#Fit statistic : Chi-Squared 98.08 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.88e-04 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.978e-08 7.425e-09
25- 50 1.727e-07 1.455e-08
50-150 3.788e-07 1.051e-07
15-150 6.413e-07 9.430e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.29562 (-1.50465 1.84707)
R1^2/D10^2 : 5.76268 (-3.05949 7.53351)
kT2 [keV] : 33.5966 (-4.6992 7.20841)
R2^2/D10^2 : 7.10654E-02 (-0.0323308 0.0446479)
------------------------------------------------------------
#Fit statistic : Chi-Squared 39.87 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.38e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.301e-08 2.711e-08
25- 50 1.513e-07 4.366e-08
50-150 5.835e-07 1.131e-07
15-150 7.978e-07 1.538e-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: 1.36435 ( -0.0473241 0.0470702 )
Norm@50keV : 1.03999E-02 ( -0.000282949 0.000282585 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 67.17 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.68e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 150.9 sec: 1.25665 ( -0.0388609 0.0390004 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.52788e-05 ( -4.10208e-07 4.10273e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00266 ( -0.202778 0.194191 )
Epeak [keV] : 164.921 ( -38.1501 115.412 )
Norm@50keV : 1.48296E-02 ( -0.00251382 0.00315306 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 56.74 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.47e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 150.9 sec: 1.22728 ( -0.04136 0.04157 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51028e-05 ( -4.25523e-07 4.2418e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 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) = 3.53e-06
S(50-100 keV) = 5.48e-06
T90 vs. Hardness ratio plot
T90 = 128.815999984741 sec.
Hardness ratio (energy fluence ratio) = 1.55241
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.85952
Count Ratio (50-100 keV) / (15-25 keV) = 1.76284
Mask shadow pattern
IMX = 1.188688293102832E+00, IMY = 9.790525804386346E-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] [']
186.6681 -62.8301 9.4 38.6 -112.6 1.0842 1.2 3.6 GX 301-2
244.9387 -15.5935 3.1 55.9 -26.2 5.5396 3.7 3.7 Sco X-1
255.9629 -37.8203 115.4 31.7 -24.0 0.0461 0.1 1.8 4U 1700-377
256.2871 -36.3031 5.8 33.0 -22.5 0.9467 2.0 10.2 GX 349+2
263.0711 -24.7102 9.3 42.5 -7.8 0.7653 1.2 4.0 GX 1+4
264.7649 -44.2984 80.0 23.3 -15.7 0.0595 0.1 9.1 4U 1735-44
270.2856 -25.0780 13.2 40.9 1.7 0.5084 0.9 0.1 GX 5-1
270.3069 -25.7347 24.4 40.2 1.6 0.2738 0.5 0.6 GRS 1758-258
274.0497 -13.9498 7.6 51.5 8.5 -1.4735 -1.5 5.8 GX 17+2
275.8130 -30.3589 108.3 35.0 8.5 0.0567 0.1 5.8 H1820-303
284.8852 -24.8097 5.7 40.2 22.2 1.3974 2.0 10.6 HT1900.1-2455
262.8358 -33.7952 20.8 33.7 -11.8 0.2628 0.6 8.0 GX 354-0
50.0399 -53.8108 3.6 54.3 164.8 5.8654 3.3 ------ UNKNOWN
57.2741 -65.7508 2.6 45.0 175.8 3.9428 4.4 ------ UNKNOWN
79.3981 -60.4193 2.6 53.3 -174.0 5.8420 4.3 ------ UNKNOWN
131.9350 -60.1179 3.1 53.2 -142.2 7.2047 3.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.352000 149.508000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.5543 -62.9053 21.8 38.6 -112.7 -0.2708 -0.5 8.6 GX 301-2
244.9798 -15.6442 155.2 55.9 -26.2 0.0791 0.1 0.2 Sco X-1
256.0192 -37.9901 9.7 31.5 -24.0 0.3246 1.2 8.9 4U 1700-377
256.5616 -36.2747 367.2 33.0 -22.1 0.0090 0.0 10.8 GX 349+2
262.9939 -24.7381 39.1 42.4 -7.9 0.1175 0.3 0.9 GX 1+4
264.9126 -44.3113 6.2 23.2 -15.5 0.4179 1.9 11.1 4U 1735-44
270.2796 -24.9789 12.8 41.0 1.8 -0.3399 -0.9 6.0 GX 5-1
270.3965 -25.8174 10.4 40.1 1.7 -0.4005 -1.1 6.8 GRS 1758-258
274.0101 -14.0339 9.8 51.4 8.5 0.9658 1.2 0.3 GX 17+2
275.9075 -30.5239 7.1 34.8 8.7 0.5079 1.6 9.5 H1820-303
285.0249 -25.0755 4.9 39.9 22.4 0.9417 2.3 9.3 HT1900.1-2455
263.0166 -33.8351 189.1 33.6 -11.6 -0.0170 -0.1 1.4 GX 354-0
48.9410 -56.6492 2.3 51.4 165.7 4.4467 5.1 ------ UNKNOWN
278.2403 -69.7202 2.4 5.2 -137.0 1.0066 4.7 ------ UNKNOWN
263.7524 -16.8413 0.3 50.0 -4.7 22.9655 41.3 ------ UNKNOWN
255.9718 -24.9863 2.7 43.8 -17.0 1.6000 4.3 ------ UNKNOWN
252.8184 -24.9525 2.5 44.7 -20.9 1.7430 4.5 ------ UNKNOWN
131.8638 -66.9219 2.4 46.6 -144.5 2.1212 4.9 ------ UNKNOWN
221.2762 -39.6527 2.0 43.3 -65.0 5.1150 5.8 ------ 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:
Sun Mar 1 23:26:07 EST 2026