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
51.9076 +74.6653 0.0133 54.8 -165.2 3.9008 14.4 TRIG_01351790
------------------------------------------
Foreground time interval of the image:
-9.920 20.000 (delta_t = 29.920 [sec])
Background time interval of the image:
-239.664 -9.920 (delta_t = 229.744 [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 16.384000
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 16.384000
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 16.384000
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 -9.920 sec. to 20.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46823 ( -0.175515 0.172776 )
Norm@50keV : 8.62273E-03 ( -0.000905409 0.000903455 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.19 using 59 PHA bins.
# Reduced chi-squared = 1.161 for 57 degrees of freedom
# Null hypothesis probability = 1.894005e-01
Photon flux (15-150 keV) in 29.92 sec: 1.06753 ( -0.125289 0.126294 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.46064e-06 ( -2.61017e-07 2.61351e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.920 sec. to 20.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.965074 ( -0.793955 0.58104 )
Epeak [keV] : 117.859 ( -41.0815 -117.859 )
Norm@50keV : 1.45317E-02 ( -0.00641531 0.0171792 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.61 using 59 PHA bins.
# Reduced chi-squared = 1.154 for 56 degrees of freedom
# Null hypothesis probability = 2.012660e-01
Photon flux (15-150 keV) in 29.92 sec: 1.04152 ( -0.130052 0.13091 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.4291e-06 ( -2.67796e-07 2.66707e-07 ) ergs/cm2
Band function
Time interval is from -9.920 sec. to 20.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.965149 ( -0.501316 0.778645 )
beta : -10.0000 ( 10 1.06581e-14 )
Epeak [keV] : 117.851 ( -33.7437 -117.851 )
Norm@50keV : 1.45295E-02 ( -0.00645574 0.0172302 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.61 using 59 PHA bins.
# Reduced chi-squared = 1.175 for 55 degrees of freedom
# Null hypothesis probability = 1.761632e-01
Photon flux (15-150 keV) in 29.92 sec: 1.05304 ( ) 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] : 18.4452 (-2.13656 2.50542)
R^2/D10^2 : 6.01519E-02 (-0.0222519 0.0337232)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.79 using 59 PHA bins.
# Reduced chi-squared = 1.435 for 57 degrees of freedom
# Null hypothesis probability = 1.736459e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.216e-07 2.778e-08
25- 50 5.727e-07 1.053e-07
50-150 1.423e-06 2.308e-07
15-150 2.117e-06 2.985e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-47.8142 -200)
Norm : 4.49124 (-0.468428 0.468428)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.347e-07 5.270e-08
25- 50 6.440e-07 1.503e-07
50-150 1.412e-06 5.923e-07
15-150 2.391e-06 8.159e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.13818 (-1.82799 3.06798)
R1^2/D10^2 : 1.59072 (-1.20931 5.17262)
kT2 [keV] : 24.5743 (-4.30341 8.35006)
R2^2/D10^2 : 1.88545E-02 (-0.0125887 0.0160615)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.057e-07 1.617e-07
25- 50 5.935e-07 2.318e-07
50-150 1.533e-06 5.436e-07
15-150 2.432e-06 8.179e-07
Peak spectrum fit
Power-law model
Time interval is from 15.780 sec. to 16.780 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32967 ( -0.522797 0.475493 )
Norm@50keV : 1.73307E-02 ( -0.0051585 0.00509545 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.31 using 59 PHA bins.
# Reduced chi-squared = 0.8475 for 57 degrees of freedom
# Null hypothesis probability = 7.870549e-01
Photon flux (15-150 keV) in 1 sec: 2.07933 ( -0.668001 0.686719 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70053e-07 ( -4.98884e-08 5.0068e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 15.780 sec. to 16.780 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.372330 ( -3.79153 7.82001 )
Epeak [keV] : 92.5689 ( -40.7449 -92.5846 )
Norm@50keV : 4.86583E-02 ( -0.0486409 2.44776 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.70 using 59 PHA bins.
# Reduced chi-squared = 0.8518 for 56 degrees of freedom
# Null hypothesis probability = 7.771878e-01
Photon flux (15-150 keV) in 1 sec: 2.00101 ( -0.68509 0.70633 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62893e-07 ( -5.5199e-08 5.2265e-08 ) ergs/cm2
Band function
Time interval is from 15.780 sec. to 16.780 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.36760 ( -4.36761 -4.36761 )
beta : -1.65461 ( -3.38084 0.680351 )
Epeak [keV] : 37.8633 ( -37.8538 200.94 )
Norm@50keV : 61.1547 ( -61.3136 25.2711 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.12 using 59 PHA bins.
# Reduced chi-squared = 0.8567 for 55 degrees of freedom
# Null hypothesis probability = 7.662579e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.6519e-07 ( -1.65183e-07 -4.978e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.3065 (-4.74688 8.36841)
R^2/D10^2 : 0.154677 (-0.154403 0.339114)
(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 9.388e-09 5.888e-09
25- 50 4.213e-08 2.508e-08
50-150 9.059e-08 5.895e-08
15-150 1.421e-07 8.640e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.361 (-109.318 -199.363)
Norm : 9.01657 (-2.62395 2.62415)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.245e-08 1.388e-08
25- 50 4.319e-08 2.643e-08
50-150 9.472e-08 5.790e-08
15-150 1.604e-07 9.605e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 12.8981 (-11.7867 9.78819)
R1^2/D10^2 : 0.352312 (-0.348394 -0.348394)
kT2 [keV] : 80.7213 (-87.1034 -87.1034)
R2^2/D10^2 : 9.06949E-04 (-0.00070849 0.305245)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.352e-08 9.215e-09
25- 50 4.557e-08 3.114e-08
50-150 1.066e-07 5.680e-08
15-150 1.657e-07 8.430e-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: 1.46823 ( -0.175515 0.172776 )
Norm@50keV : 8.62273E-03 ( -0.000905409 0.000903455 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.19 using 59 PHA bins.
# Reduced chi-squared = 1.161 for 57 degrees of freedom
# Null hypothesis probability = 1.894005e-01
Photon flux (15-150 keV) in 29.92 sec: 1.06753 ( -0.125289 0.126294 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.46064e-06 ( -2.61017e-07 2.61351e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.965074 ( -0.793955 0.58104 )
Epeak [keV] : 117.859 ( -41.0815 -117.859 )
Norm@50keV : 1.45317E-02 ( -0.00641531 0.0171792 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.61 using 59 PHA bins.
# Reduced chi-squared = 1.154 for 56 degrees of freedom
# Null hypothesis probability = 2.012660e-01
Photon flux (15-150 keV) in 29.92 sec: 1.04152 ( -0.130052 0.13091 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.4291e-06 ( -2.67796e-07 2.66707e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.965149 ( -0.501316 0.77864 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 117.851 ( -33.7437 -117.851 )
Norm@50keV : 1.45295E-02 ( -0.00645574 0.0172302 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.61 using 59 PHA bins.
# Reduced chi-squared = 1.175 for 55 degrees of freedom
# Null hypothesis probability = 1.761632e-01
Photon flux (15-150 keV) in 29.92 sec: 1.05304 ( ) 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) = 5.99e-07
S(50-100 keV) = 8.66e-07
T90 vs. Hardness ratio plot
T90 = 26.527999997139 sec.
Hardness ratio (energy fluence ratio) = 1.44574
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.50426
Count Ratio (50-100 keV) / (15-25 keV) = 1.53816
Mask shadow pattern
IMX = -1.368530591935290E+00, IMY = 3.627529546043436E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 16.384000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 16.384000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 16.384000
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:
-239.664000 -9.920000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6178 22.0113 0.5 20.8 -81.2 9.1800 21.6 0.9 Crab
16.4613 72.1672 3.1 57.9 -176.9 6.0814 3.7 ------ UNKNOWN
88.0218 29.3134 2.9 25.8 -98.2 1.8409 4.0 ------ UNKNOWN
103.1814 65.9269 2.8 53.1 -142.2 7.1336 4.1 ------ UNKNOWN
105.3279 9.1310 3.0 43.8 -64.2 6.2764 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-9.920000 20.000000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.7437 21.8906 37.7 20.9 -80.9 -0.0271 -0.3 9.6 Crab
70.9060 -26.5190 1.9 47.6 6.3 0.8458 6.1 ------ UNKNOWN
71.1096 -22.6282 2.6 43.8 4.9 0.5070 4.5 ------ UNKNOWN
51.9075 74.6653 0.8 54.8 -165.2 3.9015 14.4 ------ UNKNOWN
79.1545 72.1217 2.0 53.0 -155.4 1.2737 5.6 ------ UNKNOWN
98.0524 -14.7632 2.2 50.2 -30.9 0.9048 5.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
171.436600 429.796000
431.336000 638.958800
640.336000 962.474100
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6075 22.0169 1.2 55.2 2.2 26.6229 9.7 1.4 Crab
74.8849 66.6250 3.0 10.9 -16.2 3.9233 3.9 ------ UNKNOWN
280.7056 86.4947 2.4 17.8 -150.0 4.2893 4.8 ------ UNKNOWN
106.7560 35.2791 2.2 47.1 -27.2 9.9198 5.2 ------ UNKNOWN
138.1993 47.4260 3.5 43.8 -64.2 16.1508 3.3 ------ UNKNOWN
Plot creation:
Thu Sep 25 09:53:20 EDT 2025