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
284.7013 +61.9053 0.0170 55.8 -177.9 1.5577 11.3 TRIG_01442454
------------------------------------------
Foreground time interval of the image:
-0.336 4.592 (delta_t = 4.928 [sec])
Background time interval of the image:
-239.232 -173.710 (delta_t = 65.522 [sec])
-172.232 -167.302 (delta_t = 4.930 [sec])
-115.232 -0.336 (delta_t = 114.896 [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 -0.336 sec. to 4.592 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.949757 ( -0.211817 0.199582 )
Norm@50keV : 2.22419E-02 ( -0.00313547 0.00307596 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.22 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 57 degrees of freedom
# Null hypothesis probability = 4.668663e-01
Photon flux (15-150 keV) in 4.928 sec: 2.55505 ( -0.360672 0.368288 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20707e-06 ( -1.44771e-07 1.4478e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.336 sec. to 4.592 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.928301 ( -1.53412 1.1562 )
Epeak [keV] : 103.888 ( -18.9252 58.3409 )
Norm@50keV : 0.110045 ( -0.0675477 0.248686 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.41 using 59 PHA bins.
# Reduced chi-squared = 0.8645 for 56 degrees of freedom
# Null hypothesis probability = 7.544545e-01
Photon flux (15-150 keV) in 4.928 sec: 2.35385 ( -0.35354 0.37123 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18411e-06 ( -1.50895e-07 1.49432e-07 ) ergs/cm2
Band function
Time interval is from -0.336 sec. to 4.592 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.20107 ( -1.33929 -1.20336 )
beta : -2.17985 ( 2.16936 0.970888 )
Epeak [keV] : 96.3934 ( -38.8002 54.9848 )
Norm@50keV : 0.144009 ( -0.145445 7.89908 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.98 using 59 PHA bins.
# Reduced chi-squared = 0.8725 for 55 degrees of freedom
# Null hypothesis probability = 7.373824e-01
Photon flux (15-150 keV) in 4.928 sec: 2.32456 ( 4.67544 -0.36353 ) 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] : 24.8115 (-3.01551 3.78408)
R^2/D10^2 : 6.78780E-02 (-0.0253749 0.0367213)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.84 using 59 PHA bins.
# Reduced chi-squared = 0.8569 for 57 degrees of freedom
# Null hypothesis probability = 7.705741e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.592e-08 9.780e-09
25- 50 2.030e-07 3.896e-08
50-150 9.275e-07 1.466e-07
15-150 1.166e-06 1.917e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-20.3859 -200)
Norm : 11.7179 (-1.51329 1.51329)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.439e-07 8.208e-08
25- 50 2.768e-07 1.520e-07
50-150 6.071e-07 3.358e-07
15-150 1.028e-06 5.665e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 200.000 (-200 -200)
R1^2/D10^2 : 1.42948E-04 (-0.000142947 -0.000142947)
kT2 [keV] : 21.6121 (-4.4079 6.15984)
R2^2/D10^2 : 9.24477E-02 (-0.0457105 0.0325954)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from 0.476 sec. to 1.476 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20602 ( -0.304724 0.290227 )
Norm@50keV : 2.68004E-02 ( -0.00669704 0.00662053 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.09 using 59 PHA bins.
# Reduced chi-squared = 1.370 for 57 degrees of freedom
# Null hypothesis probability = 3.332091e-02
Photon flux (15-150 keV) in 1 sec: 3.14497 ( -0.824456 0.852087 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.71406e-07 ( -6.22858e-08 6.23077e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.476 sec. to 1.476 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.07163 ( -4.88155 2.58812 )
Epeak [keV] : 84.6455 ( -9.48127 11.8777 )
Norm@50keV : 1.44957 ( -1.4526 20.7616 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.10 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 56 degrees of freedom
# Null hypothesis probability = 3.977495e-01
Photon flux (15-150 keV) in 1 sec: 2.91080 ( -0.66951 0.7333 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.2217e-07 ( -6.5101e-08 6.52e-08 ) ergs/cm2
Band function
Time interval is from 0.476 sec. to 1.476 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.19947 ( -2.74643 -4.18106 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 84.4229 ( -9.27857 12.0346 )
Norm@50keV : 1.57681 ( -1.57401 1.73356 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.11 using 59 PHA bins.
# Reduced chi-squared = 1.057 for 55 degrees of freedom
# Null hypothesis probability = 3.615273e-01
Photon flux (15-150 keV) in 1 sec: 3.00083 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.23264e-07 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 22.9705 (-3.21953 3.82418)
R^2/D10^2 : 0.122085 (-0.0534698 0.0843801)
(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 1.168e-08 4.350e-09
25- 50 6.333e-08 2.107e-08
50-150 2.496e-07 7.320e-08
15-150 3.246e-07 8.375e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-54.572 -200)
Norm : 14.6453 (-3.44167 3.44167)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.647e-08 2.182e-08
25- 50 7.016e-08 4.197e-08
50-150 1.539e-07 9.235e-08
15-150 2.605e-07 1.528e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.27463E-02 (3.28998 -0.0727463)
R1^2/D10^2 : 3.03224E+12 (-3.03225e+12 -3.03225e+12)
kT2 [keV] : 22.9694 (-3.21842 3.82527)
R2^2/D10^2 : 0.122106 (-0.0534889 0.0843611)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
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: 0.949757 ( -0.211817 0.199582 )
Norm@50keV : 2.22419E-02 ( -0.00313547 0.00307596 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.22 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 57 degrees of freedom
# Null hypothesis probability = 4.668663e-01
Photon flux (15-150 keV) in 4.928 sec: 2.55505 ( -0.360672 0.368288 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20707e-06 ( -1.44771e-07 1.4478e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.928301 ( -1.53412 1.1562 )
Epeak [keV] : 103.888 ( -18.9252 58.3409 )
Norm@50keV : 0.110045 ( -0.0675477 0.248686 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.41 using 59 PHA bins.
# Reduced chi-squared = 0.8645 for 56 degrees of freedom
# Null hypothesis probability = 7.544545e-01
Photon flux (15-150 keV) in 4.928 sec: 2.35385 ( -0.35354 0.37123 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18411e-06 ( -1.50895e-07 1.49432e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.20107 ( -1.33929 -1.20336 )
beta : -2.17985 ( 2.16936 0.970888 )
Epeak [keV] : 96.3934 ( -38.8002 54.9848 )
Norm@50keV : 0.144009 ( -0.145445 7.90933 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.98 using 59 PHA bins.
# Reduced chi-squared = 0.8725 for 55 degrees of freedom
# Null hypothesis probability = 7.373824e-01
Photon flux (15-150 keV) in 4.928 sec: 2.32456 ( 4.67544 -0.36353 ) 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) = 2.16e-07
S(50-100 keV) = 4.48e-07
T90 vs. Hardness ratio plot
T90 = 4.4799998998642 sec.
Hardness ratio (energy fluence ratio) = 2.07407
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 4.74864
Count Ratio (50-100 keV) / (15-25 keV) = 7.43235
Mask shadow pattern
IMX = -1.470305059001443E+00, IMY = 5.362993701963163E-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:
-239.232000 -173.709800
-172.232000 -167.302000
-115.232000 -0.336000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9737 -15.6303 0.3 32.5 -33.2 14.7935 38.6 0.7 Sco X-1
254.4714 35.3403 58.0 23.6 -168.7 0.0664 0.2 0.7 Her X-1
268.3174 -1.4785 6.3 34.1 -83.4 1.1640 1.8 3.4 SW J1753.5-0127
202.4729 38.1333 2.2 38.6 109.6 4.9254 5.3 ------ UNKNOWN
203.8813 18.6006 2.8 33.3 77.2 2.6096 4.1 ------ UNKNOWN
206.2967 -0.2176 2.6 36.1 43.8 2.6902 4.4 ------ UNKNOWN
238.0347 57.7956 2.9 41.5 157.3 2.7226 3.9 ------ UNKNOWN
216.8785 -38.3059 3.0 58.3 -1.9 6.7238 3.9 ------ UNKNOWN
236.5012 -6.1262 2.6 22.5 -16.1 1.4152 4.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.336000 4.592000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.1491 -15.5422 9.4 32.5 -33.5 0.0461 1.2 11.4 Sco X-1
254.5353 35.2589 73.7 23.6 -168.5 -0.0049 -0.2 6.3 Her X-1
268.2321 -1.4977 4.1 34.1 -83.3 -0.1620 -2.8 8.6 SW J1753.5-0127
221.2296 66.2069 2.2 51.2 149.0 0.8709 5.3 ------ UNKNOWN
284.7018 61.9052 1.0 55.8 -177.9 1.5639 11.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
128.668590 302.823600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.2124 35.3373 8.8 32.7 -22.7 0.4032 1.3 12.0 Her X-1
299.5827 35.2059 0.8 28.3 -98.9 5.5887 14.0 0.5 Cyg X-1
307.9138 40.8027 0.0 25.3 -116.9 -0.8510 -2.8 12.7 Cyg X-3
325.9804 38.2105 9.1 34.6 -138.7 0.4787 1.3 11.2 Cyg X-2
97.1312 79.4075 2.2 38.6 109.7 4.0295 5.3 ------ UNKNOWN
32.1227 58.5985 3.1 47.2 150.1 3.1547 3.7 ------ UNKNOWN
270.6042 16.3254 2.0 46.7 -53.9 6.0059 5.7 ------ UNKNOWN
Plot creation:
Wed Jan 21 13:33:10 EST 2026