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
213.8158 -58.0101 0.0075 27.6 86.2 3.9442 25.6 TRIG_01343270
------------------------------------------
Foreground time interval of the image:
-15.916 21.189 (delta_t = 37.105 [sec])
Background time interval of the image:
-639.411 -630.782 (delta_t = 8.629 [sec])
-239.912 -15.916 (delta_t = 223.996 [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
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
8 ms binning
From T100_start-3 s to T100_start+3 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
2 ms binning
From T100_start-1 s to T100_start+1 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
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 -15.916 sec. to 141.428 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84625 ( -0.0418199 0.0419991 )
Norm@50keV : 8.39485E-03 ( -0.000172247 0.000172202 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.52 using 59 PHA bins.
# Reduced chi-squared = 0.5705 for 57 degrees of freedom
# Null hypothesis probability = 9.962625e-01
Photon flux (15-150 keV) in 157.3 sec: 1.17819 ( -0.0299206 0.0301093 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21425e-05 ( -2.49846e-07 2.49915e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.916 sec. to 141.428 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83287 ( -0.144367 0.0535845 )
Epeak [keV] : 675.993 ( )
Norm@50keV : 8.51486E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.57 using 59 PHA bins.
# Reduced chi-squared = 0.5815 for 56 degrees of freedom
# Null hypothesis probability = 9.948505e-01
Photon flux (15-150 keV) in 157.3 sec: 1.17826 ( -0.03078 0.02874 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21427e-05 ( -2.49022e-07 2.47637e-07 ) ergs/cm2
Band function
Time interval is from -15.916 sec. to 141.428 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.64111 ( 1.47638 1.47638 )
beta : -1.84993 ( 1.85044 0.0458506 )
Epeak [keV] : 49.6937 ( -38.0783 -38.0783 )
Norm@50keV : 1.16079E-02 ( -0.00336615 0.958694 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.47 using 59 PHA bins.
# Reduced chi-squared = 0.5904 for 55 degrees of freedom
# Null hypothesis probability = 9.933305e-01
Photon flux (15-150 keV) in 157.3 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] : 14.5489 ( )
R^2/D10^2 : 0.125033 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 622.75 using 59 PHA bins.
# Reduced chi-squared = 10.926 for 57 degrees of freedom
# Null hypothesis probability = 4.143749e-96
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.755e-07 3.932e-08
25- 50 3.381e-06 9.517e-08
50-150 4.802e-06 1.715e-07
15-150 9.058e-06 2.021e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 120.246 (-14.0095 9.57802)
Norm : 4.72173 (-0.133185 0.225133)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.934e-06 1.062e-07
25- 50 3.462e-06 1.337e-07
50-150 6.184e-06 1.271e-06
15-150 1.158e-05 1.332e-06
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.98379 (-0.511203 0.534949)
R1^2/D10^2 : 1.41335 (-0.340001 0.482501)
kT2 [keV] : 25.9608 (-1.96044 2.40729)
R2^2/D10^2 : 1.13916E-02 (-0.00322584 0.00402574)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.943e-06 1.447e-07
25- 50 3.557e-06 1.424e-07
50-150 6.291e-06 3.099e-07
15-150 1.179e-05 4.318e-07
Peak spectrum fit
Power-law model
Time interval is from 77.632 sec. to 78.632 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65844 ( -0.0847362 0.0855906 )
Norm@50keV : 4.19841E-02 ( -0.00206758 0.00206058 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.28 using 59 PHA bins.
# Reduced chi-squared = 0.7241 for 57 degrees of freedom
# Null hypothesis probability = 9.419355e-01
Photon flux (15-150 keV) in 1 sec: 5.49744 ( -0.272678 0.27315 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.90143e-07 ( -2.0247e-08 2.03178e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 77.632 sec. to 78.632 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41815 ( -0.360416 0.279797 )
Epeak [keV] : 121.780 ( -45.539 -121.781 )
Norm@50keV : 5.54651E-02 ( -0.0147973 0.0280292 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.79 using 59 PHA bins.
# Reduced chi-squared = 0.7106 for 56 degrees of freedom
# Null hypothesis probability = 9.500888e-01
Photon flux (15-150 keV) in 1 sec: 5.42958 ( -0.28755 0.28791 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.83874e-07 ( -2.2351e-08 2.222e-08 ) ergs/cm2
Band function
Time interval is from 77.632 sec. to 78.632 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.18488 ( 1.13883 4.37733 )
beta : -1.83368 ( 1.83355 0.21199 )
Epeak [keV] : 75.9146 ( -76.7744 46.7825 )
Norm@50keV : 7.57495E-02 ( -0.0325192 1.76497 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.75 using 59 PHA bins.
# Reduced chi-squared = 0.7045 for 55 degrees of freedom
# Null hypothesis probability = 9.525562e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.82352e-07 ( -3.82345e-07 -2.1755e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.8882 ( )
R^2/D10^2 : 0.783809 ( )
(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 3.196e-08 2.885e-09
25- 50 1.179e-07 6.600e-09
50-150 1.491e-07 1.515e-08
15-150 2.990e-07 1.675e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 155.644 (-32.1518 -155.494)
Norm : 22.5336 (-1.25938 1.41187)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.769e-08 4.070e-09
25- 50 1.075e-07 9.325e-09
50-150 2.154e-07 6.420e-08
15-150 3.806e-07 7.230e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.34187 (-1.39636 1.58151)
R1^2/D10^2 : 5.19839 (-2.32931 5.32627)
kT2 [keV] : 26.3338 (-5.10418 10.5774)
R2^2/D10^2 : 5.78604E-02 (-0.0397524 0.0752002)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.395e-08 7.495e-09
25- 50 1.102e-07 1.384e-08
50-150 2.148e-07 5.505e-08
15-150 3.790e-07 7.325e-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: 1.71732 ( -0.095854 0.0969012 )
Norm@50keV : 6.69061E-03 ( -0.000354689 0.000352984 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.54 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 57 degrees of freedom
# Null hypothesis probability = 3.491770e-01
Photon flux (15-150 keV) in 37.1 sec: 0.894033 ( -0.0479477 0.0481324 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29525e-06 ( -1.26702e-07 1.27242e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71971 ( -0.0990199 0.0951474 )
Epeak [keV] : 9999.36 ( -9999.35 -9999.36 )
Norm@50keV : 6.68780E-03 ( -0.00261401 0.00262656 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.56 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 56 degrees of freedom
# Null hypothesis probability = 3.149246e-01
Photon flux (15-150 keV) in 37.1 sec: 0.894193 ( -0.02548 0.047106 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29521e-06 ( -1.30581e-07 1.25313e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.60185 ( 1.60185 1.60185 )
beta : -1.71732 ( -0.0969325 0.0959402 )
Epeak [keV] : 23.7253 ( -23.7253 -23.7253 )
Norm@50keV : 9.44215E-03 ( -0.00333155 0.947882 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.54 using 59 PHA bins.
# Reduced chi-squared = 1.101 for 55 degrees of freedom
# Null hypothesis probability = 2.826456e-01
Photon flux (15-150 keV) in 37.1 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) = 3.48e-06
S(50-100 keV) = 3.87e-06
T90 vs. Hardness ratio plot
T90 = 106.855999946594 sec.
Hardness ratio (energy fluence ratio) = 1.11207
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.08997
Count Ratio (50-100 keV) / (15-25 keV) = 0.671142
Mask shadow pattern
IMX = 3.488050120015563E-02, IMY = -5.217212374649708E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
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:
-639.411400 -630.782000
-239.912000 -15.916000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5379 -40.5559 0.4 30.1 -148.7 13.9506 30.4 0.4 Vela X-1
170.2392 -60.4720 2.9 17.7 140.1 1.5051 4.0 9.3 Cen X-3
186.2781 -62.8119 83.3 20.5 117.2 0.0618 0.1 10.7 GX 301-2
136.7810 -65.1631 3.4 31.0 161.7 1.6107 3.4 ------ UNKNOWN
156.1610 -37.4919 3.5 16.2 -125.9 1.2395 3.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-15.916000 21.188630
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5197 -40.5910 2.4 30.1 -148.8 -0.4709 -4.9 2.2 Vela X-1
170.6000 -60.5635 8.2 17.7 139.5 -0.1290 -1.4 9.1 Cen X-3
187.1172 -62.7589 0.0 20.6 116.2 0.0294 0.3 12.7 GX 301-2
213.8158 -58.0102 0.4 27.6 86.2 3.9444 25.6 ------ UNKNOWN
218.2703 -1.3441 2.6 56.1 4.3 2.6319 4.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
85.988600 482.131600
520.088000 953.288600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.4376 -60.4301 5.7 22.0 -141.6 1.6054 2.0 12.1 Cen X-3
187.0557 -62.7599 3.9 14.0 -147.8 2.0416 2.9 11.0 GX 301-2
244.9860 -15.6350 1.2 48.3 15.1 12.1584 9.3 0.5 Sco X-1
255.8435 -37.8867 6.0 33.7 45.2 2.3692 1.9 7.2 4U 1700-377
256.4517 -36.3669 5.4 35.2 44.2 2.8024 2.1 3.5 GX 349+2
262.9859 -24.7423 8.6 47.9 40.9 2.5674 1.3 1.3 GX 1+4
264.5984 -44.6002 0.0 33.5 62.2 -2.2891 -1.6 10.9 4U 1735-44
262.8458 -33.9068 19.2 40.4 48.4 1.0124 0.6 8.3 GX 354-0
61.5598 -68.1734 2.4 52.2 165.9 11.8731 4.9 ------ UNKNOWN
213.7419 -57.9830 1.7 0.1 -97.4 5.0136 6.8 ------ UNKNOWN
Plot creation:
Thu Aug 21 18:26:55 EDT 2025