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
227.9088 +14.2160 0.0078 44.2 -45.3 4.8958 24.7 TRIG_01512686
------------------------------------------
Foreground time interval of the image:
-4.900 11.349 (delta_t = 16.249 [sec])
Background time interval of the image:
-60.952 -4.900 (delta_t = 56.052 [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 -4.900 sec. to 66.332 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39279 ( -0.0886418 0.0880925 )
Norm@50keV : 6.66096E-03 ( -0.000336575 0.00033642 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.08 using 59 PHA bins.
# Reduced chi-squared = 0.7909 for 57 degrees of freedom
# Null hypothesis probability = 8.731420e-01
Photon flux (15-150 keV) in 71.23 sec: 0.809873 ( -0.0453797 0.0455924 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.59132e-06 ( -2.37977e-07 2.38249e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.900 sec. to 66.332 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.933334 ( -0.383789 0.354054 )
Epeak [keV] : 131.878 ( -35.9118 223.659 )
Norm@50keV : 1.07006E-02 ( -0.00320496 0.00499992 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.07 using 59 PHA bins.
# Reduced chi-squared = 0.7155 for 56 degrees of freedom
# Null hypothesis probability = 9.466537e-01
Photon flux (15-150 keV) in 71.23 sec: 0.788183 ( -0.047895 0.048183 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.49961e-06 ( -2.52005e-07 2.50772e-07 ) ergs/cm2
Band function
Time interval is from -4.900 sec. to 66.332 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.933316 ( -0.167153 0.333401 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 131.857 ( -23.4025 222.994 )
Norm@50keV : 1.07000E-02 ( -0.00217848 0.0013916 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.07 using 59 PHA bins.
# Reduced chi-squared = 0.7285 for 55 degrees of freedom
# Null hypothesis probability = 9.348199e-01
Photon flux (15-150 keV) in 71.23 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] : 18.3399 (-1.15848 1.25619)
R^2/D10^2 : 4.67377E-02 (-0.00971686 0.0120912)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 108.52 using 59 PHA bins.
# Reduced chi-squared = 1.9038 for 57 degrees of freedom
# Null hypothesis probability = 4.651081e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.228e-07 2.454e-08
25- 50 1.045e-06 8.085e-08
50-150 2.563e-06 2.037e-07
15-150 3.831e-06 2.294e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-13.0916 -200)
Norm : 3.42849 (-0.172919 0.172919)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.081e-07 3.697e-08
25- 50 1.170e-06 7.550e-08
50-150 2.565e-06 1.563e-07
15-150 4.343e-06 2.742e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.56437 (-1.40639 1.59251)
R1^2/D10^2 : 0.381452 (-0.1552 0.299225)
kT2 [keV] : 30.3374 (-4.63358 7.71702)
R2^2/D10^2 : 6.55721E-03 (-0.00357232 0.00550965)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.441e-07 9.456e-08
25- 50 1.155e-06 1.991e-07
50-150 2.921e-06 7.501e-07
15-150 4.520e-06 9.527e-07
Peak spectrum fit
Power-law model
Time interval is from 0.724 sec. to 1.724 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.860510 ( -0.15977 0.154263 )
Norm@50keV : 4.92878E-02 ( -0.00515542 0.00509346 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.96 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 57 degrees of freedom
# Null hypothesis probability = 3.037847e-01
Photon flux (15-150 keV) in 1 sec: 5.65722 ( -0.5827 0.58611 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.61828e-07 ( -5.4218e-08 5.42589e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.724 sec. to 1.724 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.271905 ( -0.889743 0.736748 )
Epeak [keV] : 132.513 ( -31.1268 117.207 )
Norm@50keV : 0.133489 ( -0.0624495 0.143192 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.50 using 59 PHA bins.
# Reduced chi-squared = 0.9733 for 56 degrees of freedom
# Null hypothesis probability = 5.316871e-01
Photon flux (15-150 keV) in 1 sec: 5.46804 ( -0.58377 0.59111 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.61757e-07 ( -5.6156e-08 5.5805e-08 ) ergs/cm2
Band function
Time interval is from 0.724 sec. to 1.724 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.282824 ( -0.728688 0.696006 )
beta : -9.36536 ( 9.37167 19.3717 )
Epeak [keV] : 132.293 ( -20.6439 105.038 )
Norm@50keV : 0.134292 ( -0.0550797 30.4185 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.50 using 59 PHA bins.
# Reduced chi-squared = 0.9910 for 55 degrees of freedom
# Null hypothesis probability = 4.934987e-01
Photon flux (15-150 keV) in 1 sec: 5.49156 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 26.1905 (-2.84854 3.39802)
R^2/D10^2 : 0.130123 (-0.0409859 0.0564154)
(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 1.512e-08 2.755e-09
25- 50 8.778e-08 1.412e-08
50-150 4.429e-07 5.725e-08
15-150 5.458e-07 6.475e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 23.6321 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.885e-08 3.259e-08
25- 50 1.132e-07 4.446e-08
50-150 2.483e-07 1.306e-07
15-150 4.203e-07 2.296e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 13.0889 (-11.1146 11.6419)
R1^2/D10^2 : 0.397884 (-0.314229 498.193)
kT2 [keV] : 35.2819 (-33.3641 -35.2819)
R2^2/D10^2 : 4.16192E-02 (-0.0411063 0.0925514)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.201e-08 1.256e-08
25- 50 9.770e-08 5.245e-08
50-150 4.428e-07 2.273e-07
15-150 5.625e-07 2.853e-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: 1.10402 ( -0.0810566 0.0798295 )
Norm@50keV : 2.11660E-02 ( -0.00103967 0.00103591 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.70 using 59 PHA bins.
# Reduced chi-squared = 1.118 for 57 degrees of freedom
# Null hypothesis probability = 2.525741e-01
Photon flux (15-150 keV) in 16.25 sec: 2.45609 ( -0.127355 0.127822 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.59146e-06 ( -1.7232e-07 1.72419e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.350137 ( -0.380031 0.350338 )
Epeak [keV] : 132.496 ( -25.189 60.7477 )
Norm@50keV : 4.38714E-02 ( -0.0122958 0.0185195 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.00 using 59 PHA bins.
# Reduced chi-squared = 0.8750 for 56 degrees of freedom
# Null hypothesis probability = 7.347567e-01
Photon flux (15-150 keV) in 16.25 sec: 2.37140 ( -0.13143 0.13225 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.51723e-06 ( -1.79953e-07 1.7914e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.55127 ( -2.80487 -2.55133 )
beta : -1.31416 ( -0.14505 0.126584 )
Epeak [keV] : 45.8336 ( -8.08184 92.7194 )
Norm@50keV : 2.94831 ( -2.94896 51.4344 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.38 using 59 PHA bins.
# Reduced chi-squared = 0.8432 for 55 degrees of freedom
# Null hypothesis probability = 7.896594e-01
Photon flux (15-150 keV) in 16.25 sec: 2.31069 ( ) 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) = 1.08e-06
S(50-100 keV) = 1.64e-06
T90 vs. Hardness ratio plot
T90 = 57.4759999513626 sec.
Hardness ratio (energy fluence ratio) = 1.51852
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.84123
Count Ratio (50-100 keV) / (15-25 keV) = 1.60152
Mask shadow pattern
IMX = 6.839248521307840E-01, IMY = 6.913376458530039E-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:
-60.952000 -4.900000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9865 -15.6435 0.6 16.6 -91.0 2.4617 18.3 0.5 Sco X-1
254.5662 35.4162 5.0 50.2 -1.9 -0.5938 -2.3 6.9 Her X-1
255.8327 -37.9366 3.3 24.3 -162.0 -0.4186 -3.5 9.2 4U 1700-377
256.3374 -36.4993 4.7 22.8 -162.0 0.2909 2.5 6.6 GX 349+2
262.8364 -24.6700 2.9 10.4 -177.8 0.4469 3.9 10.4 GX 1+4
264.8823 -44.4297 44.0 30.3 -178.0 0.0403 0.3 6.1 4U 1735-44
268.4061 -1.2995 10.6 14.4 32.4 0.1341 1.1 9.5 SW J1753.5-0127
270.3538 -25.0299 4.3 13.3 151.4 0.3427 2.7 4.8 GX 5-1
270.4499 -25.6375 5.4 13.8 152.7 0.2931 2.3 10.2 GRS 1758-258
274.1312 -14.0391 7.9 11.7 96.4 -0.1843 -1.5 7.3 GX 17+2
275.8685 -30.2705 3.1 20.4 149.9 0.4878 3.7 6.5 H1820-303
285.0322 -25.0691 8.4 24.1 126.2 0.2228 1.4 8.9 HT1900.1-2455
288.9285 10.8158 5.0 36.6 54.2 0.6219 2.3 10.9 GRS 1915+105
263.0200 -33.8543 23.6 19.6 -176.3 0.0613 0.5 1.9 GX 354-0
305.0592 -21.0829 2.7 41.4 111.9 2.6440 4.3 ------ UNKNOWN
285.4472 -3.5081 2.5 25.4 73.2 0.7749 4.5 ------ UNKNOWN
264.1812 26.6385 2.8 40.9 8.9 0.7712 4.0 ------ UNKNOWN
263.2316 28.9617 2.9 43.2 7.5 0.8548 4.0 ------ UNKNOWN
236.2844 -53.2145 2.4 44.0 -151.9 1.0330 4.7 ------ UNKNOWN
226.8824 29.7884 2.0 55.6 -31.3 4.4259 5.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-4.900000 11.348600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.1210 -15.4926 37.6 16.4 -90.4 -0.0229 -0.3 12.1 Sco X-1
254.5737 35.3582 25.3 50.1 -1.9 0.0688 0.5 5.8 Her X-1
255.9132 -37.7801 6.6 24.1 -162.0 0.1172 1.7 5.2 4U 1700-377
256.2638 -36.4455 5.8 22.8 -161.8 -0.1308 -2.0 8.4 GX 349+2
263.1520 -24.5802 0.0 10.4 -179.4 -0.0489 -0.7 12.6 GX 1+4
264.9427 -44.5368 10.0 30.4 -178.0 0.0848 1.2 10.0 4U 1735-44
268.2199 -1.4519 13.1 14.2 31.9 -0.0579 -0.9 8.9 SW J1753.5-0127
270.4295 -25.2083 14.0 13.5 151.7 -0.0547 -0.8 11.1 GX 5-1
270.2836 -25.5947 8.1 13.7 153.1 -0.0959 -1.5 9.0 GRS 1758-258
273.9094 -14.1718 5.0 11.5 97.0 -0.1580 -2.3 9.9 GX 17+2
276.1156 -30.4805 0.0 20.7 149.8 -0.0680 -1.0 12.0 H1820-303
285.1517 -24.7422 14.9 24.1 125.3 0.0577 0.8 12.4 HT1900.1-2455
288.8840 11.0350 3.0 36.7 53.8 0.4708 3.8 7.4 GRS 1915+105
263.0447 -33.8312 37.9 19.6 -176.4 0.0198 0.3 2.8 GX 354-0
278.2002 20.7106 2.4 38.4 30.8 0.4963 4.8 ------ UNKNOWN
287.8509 -58.0183 2.1 47.8 167.9 0.8279 5.4 ------ UNKNOWN
248.8703 -47.3662 2.8 34.9 -158.3 0.3275 4.1 ------ UNKNOWN
227.9087 14.2161 0.5 44.2 -45.3 4.8966 24.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
96.548630 199.175600
206.048000 213.325700
218.048000 242.208000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9779 -15.6443 0.6 34.3 162.1 5.7082 19.2 0.3 Sco X-1
254.4255 35.2090 11.3 31.7 56.1 -0.3992 -1.0 8.2 Her X-1
246.8440 -27.6841 2.8 45.8 168.5 2.4154 4.1 ------ UNKNOWN
224.2713 55.0860 2.5 41.0 9.0 1.5968 4.6 ------ UNKNOWN
204.8014 -36.5485 2.7 55.3 -145.3 5.0596 4.2 ------ UNKNOWN
Plot creation:
Tue Sep 22 21:12:45 EDT 2026