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
161.8058 1.2898 0.0081 35.0877 131.0785 3.5812795 23.837 TRIG_01215912
Foreground time interval of the image:
-19.224 10.501 (delta_t = 29.725 [sec])
Background time interval of the image:
-239.600 -19.224 (delta_t = 220.376 [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 -19.224 sec. to 315.300 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61914 ( -0.0798526 0.0803192 )
Norm@50keV : 1.98215E-03 ( -8.77709e-05 8.74555e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 60.42 using 59 bins.
Reduced chi-squared = 1.06
# Null hypothesis probability of 3.53e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 334.5 sec: 0.256257 ( -0.011703 0.011731 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.18765e-06 ( -2.90444e-07 2.91623e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -19.224 sec. to 315.300 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40789 ( -0.340438 0.248745 )
Epeak [keV] : 142.140 ( -58.5391 -142.147 )
Norm@50keV : 2.52244E-03 ( -0.000599555 0.00116696 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 59.15 using 59 bins.
Reduced chi-squared = 1.05625
# Null hypothesis probability of 3.61e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 334.5 sec: 0.252950 ( -0.012668 0.012687 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.08492e-06 ( -3.30707e-07 3.2874e-07 ) ergs/cm2
Band function
Time interval is from -19.224 sec. to 315.300 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] : 14.2906 ( )
R^2/D10^2 : 3.27681E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 169.84 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.76e-13 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.718e-07 3.847e-08
25- 50 1.791e-06 1.050e-07
50-150 2.433e-06 2.201e-07
15-150 4.695e-06 2.275e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 175.070 (-36.2109 -174.35)
Norm : 1.03755 (-0.050904 0.0561803)
------------------------------------------------------------
#Fit statistic : Chi-Squared 59.55 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.83e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.780e-07 5.586e-08
25- 50 1.662e-06 1.612e-07
50-150 3.484e-06 1.054e-06
15-150 6.024e-06 1.259e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.94631 (-1.46013 1.46057)
R1^2/D10^2 : 0.181991 (-0.0718483 0.166194)
kT2 [keV] : 28.7507 (-5.99155 11.7629)
R2^2/D10^2 : 2.00634E-03 (-0.00134222 0.00279924)
------------------------------------------------------------
#Fit statistic : Chi-Squared 68.32 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.07e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.807e-07 1.044e-07
25- 50 1.736e-06 2.106e-07
50-150 3.507e-06 8.886e-07
15-150 6.023e-06 1.007e-06
Peak spectrum fit
Power-law model
Time interval is from 21.620 sec. to 22.620 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40468 ( -0.179708 0.182125 )
Norm@50keV : 2.42206E-02 ( -0.00275519 0.00274811 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 67.27 using 59 bins.
Reduced chi-squared = 1.18018
# Null hypothesis probability of 1.66e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 2.95282 ( -0.33728 0.33776 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33841e-07 ( -2.90598e-08 2.92767e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 21.620 sec. to 22.620 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.304777 ( -0.990356 0.814139 )
Epeak [keV] : 80.1835 ( -17.7422 78.3497 )
Norm@50keV : 8.36385E-02 ( -0.0495064 0.162849 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 61.69 using 59 bins.
Reduced chi-squared = 1.10161
# Null hypothesis probability of 2.80e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 2.84601 ( -0.34825 0.34772 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.21335e-07 ( -3.10432e-08 3.12456e-08 ) ergs/cm2
Band function
Time interval is from 21.620 sec. to 22.620 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] : 16.2985 (-1.98171 2.27618)
R^2/D10^2 : 0.269926 (-0.0981829 0.151455)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 68.95 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.33e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.476e-08 3.160e-09
25- 50 6.310e-08 9.670e-09
50-150 1.180e-07 2.442e-08
15-150 1.958e-07 3.125e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-53.1052 -200)
Norm : 12.2607 (-1.37188 1.37188)
------------------------------------------------------------
#Fit statistic : Chi-Squared 66.57 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.81e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.054e-08 1.691e-08
25- 50 5.874e-08 3.228e-08
50-150 1.288e-07 7.085e-08
15-150 2.181e-07 1.193e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.35998 (-3.59377 5.75413)
R1^2/D10^2 : 2.63435 (-2.1422 88.9766)
kT2 [keV] : 20.5880 (-3.98556 15.4154)
R2^2/D10^2 : 0.103207 (-0.0937875 0.0858512)
------------------------------------------------------------
#Fit statistic : Chi-Squared 61.39 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.58e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.366e-08 1.330e-08
25- 50 5.961e-08 2.988e-08
50-150 1.354e-07 7.600e-08
15-150 2.187e-07 9.844e-08
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: 1.42135 ( -0.0989762 0.0990283 )
Norm@50keV : 8.06266E-03 ( -0.000458105 0.000457775 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 53.31 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.14e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 29.72 sec: 0.986746 ( -0.0586469 0.0587678 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.30552e-06 ( -1.41655e-07 1.4214e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.978407 ( -0.43929 0.399968 )
Epeak [keV] : 122.986 ( -36.8764 493.448 )
Norm@50keV : 1.31196E-02 ( -0.00457174 0.00785813 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 49.71 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 7.10e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 29.72 sec: 0.965231 ( -0.061608 0.061729 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.24725e-06 ( -1.53578e-07 1.52764e-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) = 1.62e-06
S(50-100 keV) = 2.11e-06
T90 vs. Hardness ratio plot
T90 = 258.031999945641 sec.
Hardness ratio (energy fluence ratio) = 1.30247
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.24558
Count Ratio (50-100 keV) / (15-25 keV) = 0.897885
Mask shadow pattern
IMX = -4.616012525820294E-01, IMY = -5.295442998562524E-01
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:
-239.600000 -19.224000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5729 -40.5623 2.0 27.8 -126.6 2.4990 5.7 2.1 Vela X-1
162.3501 -4.2314 2.6 33.6 140.5 2.1437 4.5 ------ UNKNOWN
120.5214 12.0312 2.3 26.9 43.2 2.0782 5.1 ------ UNKNOWN
72.9554 -11.9610 2.1 55.2 -32.3 9.5929 5.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-19.224000 10.500600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.6052 -40.4985 2.3 27.7 -126.7 -0.4436 -4.9 4.9 Vela X-1
161.8058 1.2898 0.5 35.1 131.1 3.5811 23.8 ------ UNKNOWN
185.1200 -40.2664 2.4 55.3 -166.7 1.2905 4.8 ------ UNKNOWN
83.6861 -25.7293 3.0 44.8 -50.1 0.8645 3.8 ------ UNKNOWN
87.5457 -34.8657 3.5 43.6 -64.0 1.0093 3.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
135.700600 962.531000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.4644 -40.5653 2.2 48.2 -18.2 11.4727 5.1 3.0 Vela X-1
114.1203 -7.3832 2.7 48.3 34.0 13.7710 4.3 ------ UNKNOWN
134.8704 0.2953 2.4 26.9 43.2 7.3599 4.7 ------ UNKNOWN
171.3141 11.7770 2.6 14.2 176.7 4.9383 4.4 ------ UNKNOWN
134.8755 -27.5431 3.2 38.7 -5.1 6.0225 3.6 ------ UNKNOWN
213.8744 30.3303 2.3 57.3 -170.9 23.8232 5.0 ------ UNKNOWN
174.3628 -42.9453 2.7 45.6 -57.9 23.9098 4.3 ------ UNKNOWN
Plot creation:
Sat Mar 9 15:14:02 EST 2024