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 +14.2161 0.0078 44.2 -45.3 4.8893 24.8 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 80.244 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41764 ( -0.0879044 0.0873752 )
Norm@50keV : 5.75285E-03 ( -0.000286608 0.000286507 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.43 using 59 PHA bins.
# Reduced chi-squared = 0.7093 for 57 degrees of freedom
# Null hypothesis probability = 9.525972e-01
Photon flux (15-150 keV) in 85.14 sec: 0.703446 ( -0.0389121 0.0390932 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.71601e-06 ( -2.41885e-07 2.42165e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.900 sec. to 80.244 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01148 ( -0.37426 0.345876 )
Epeak [keV] : 137.292 ( -40.5221 378.169 )
Norm@50keV : 8.77490E-03 ( -0.00259477 0.00402413 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.36 using 59 PHA bins.
# Reduced chi-squared = 0.6493 for 56 degrees of freedom
# Null hypothesis probability = 9.806357e-01
Photon flux (15-150 keV) in 85.14 sec: 0.686638 ( -0.041104 0.041338 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.62999e-06 ( -2.56408e-07 2.55105e-07 ) ergs/cm2
Band function
Time interval is from -4.900 sec. to 80.244 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.735115 ( -1.01567 0.230976 )
beta : -1.55333 ( 1.55927 0.147739 )
Epeak [keV] : 44.2178 ( -26.1709 131.803 )
Norm@50keV : 0.119229 ( -0.117028 55.4206 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.86 using 59 PHA bins.
# Reduced chi-squared = 0.6338 for 55 degrees of freedom
# Null hypothesis probability = 9.844881e-01
Photon flux (15-150 keV) in 85.14 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] : 17.9835 (-1.1335 1.23229)
R^2/D10^2 : 4.29517E-02 (-0.00895001 0.0111358)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 111.77 using 59 PHA bins.
# Reduced chi-squared = 1.9609 for 57 degrees of freedom
# Null hypothesis probability = 2.008204e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.369e-07 2.354e-08
25- 50 1.095e-06 7.918e-08
50-150 2.569e-06 2.069e-07
15-150 3.901e-06 2.260e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-14.3124 -200)
Norm : 2.96180 (-0.14743 0.14743)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.281e-07 3.435e-08
25- 50 1.208e-06 7.194e-08
50-150 2.650e-06 1.664e-07
15-150 4.486e-06 2.656e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.53077 (-1.33569 1.49405)
R1^2/D10^2 : 0.347371 (-0.13697 0.256677)
kT2 [keV] : 30.7618 (-4.76472 7.8693)
R2^2/D10^2 : 5.31253E-03 (-0.00287961 0.00451316)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.725e-07 9.953e-08
25- 50 1.204e-06 2.077e-07
50-150 2.974e-06 8.195e-07
15-150 4.651e-06 8.918e-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: 0.861114 ( -0.159559 0.154083 )
Norm@50keV : 4.92447E-02 ( -0.00514281 0.00508125 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.96 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 57 degrees of freedom
# Null hypothesis probability = 3.037440e-01
Photon flux (15-150 keV) in 1 sec: 5.65224 ( -0.581465 0.584707 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.61205e-07 ( -5.40966e-08 5.4132e-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: -0.268575 ( -0.88793 0.735485 )
Epeak [keV] : 132.617 ( -31.1806 117.619 )
Norm@50keV : 0.133085 ( -0.0621973 0.142418 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.52 using 59 PHA bins.
# Reduced chi-squared = 0.9735 for 56 degrees of freedom
# Null hypothesis probability = 5.311555e-01
Photon flux (15-150 keV) in 1 sec: 5.46356 ( -0.58253 0.58982 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.61122e-07 ( -5.6024e-08 5.5675e-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 : 0.268727 ( -0.689276 0.735612 )
beta : -10.0000 ( 10 3.90799e-14 )
Epeak [keV] : 132.597 ( -20.5301 117.619 )
Norm@50keV : 0.133114 ( -0.0622026 0.142608 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.52 using 59 PHA bins.
# Reduced chi-squared = 0.9912 for 55 degrees of freedom
# Null hypothesis probability = 4.930184e-01
Photon flux (15-150 keV) in 1 sec: 5.48559 ( ) 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] : 26.1819 (-2.84467 3.3925)
R^2/D10^2 : 0.130106 (-0.0409421 0.056338)
(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 1.511e-08 3.120e-09
25- 50 8.771e-08 1.316e-08
50-150 4.423e-07 5.985e-08
15-150 5.451e-07 6.555e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 ( )
Norm : 23.5882 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.874e-08 2.664e-08
25- 50 1.130e-07 3.457e-08
50-150 2.478e-07 1.360e-07
15-150 4.195e-07 2.222e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 13.0615 (-11.0616 11.655)
R1^2/D10^2 : 0.399809 (-0.314775 459.915)
kT2 [keV] : 35.2610 (-33.3299 -35.261)
R2^2/D10^2 : 4.16741E-02 (-0.0411397 0.0924798)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.202e-08 1.276e-08
25- 50 9.764e-08 5.380e-08
50-150 4.422e-07 2.273e-07
15-150 5.618e-07 2.837e-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: 1.10533 ( -0.0808952 0.0796778 )
Norm@50keV : 2.11694E-02 ( -0.00103721 0.00103348 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.55 using 59 PHA bins.
# Reduced chi-squared = 1.115 for 57 degrees of freedom
# Null hypothesis probability = 2.568189e-01
Photon flux (15-150 keV) in 16.25 sec: 2.45685 ( -0.12716 0.127527 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.59054e-06 ( -1.71917e-07 1.72016e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.356201 ( -0.37882 0.349308 )
Epeak [keV] : 132.824 ( -25.3502 61.3948 )
Norm@50keV : 4.36847E-02 ( -0.0122164 0.0183789 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.96 using 59 PHA bins.
# Reduced chi-squared = 0.8743 for 56 degrees of freedom
# Null hypothesis probability = 7.361339e-01
Photon flux (15-150 keV) in 16.25 sec: 2.37248 ( -0.1312 0.132 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.51671e-06 ( -1.79514e-07 1.78701e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.51495 ( -2.97657 -2.51501 )
beta : -1.31426 ( -0.144637 0.12638 )
Epeak [keV] : 45.9220 ( -6.25766 119.723 )
Norm@50keV : 2.81070 ( -2.81132 52.1408 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.38 using 59 PHA bins.
# Reduced chi-squared = 0.8432 for 55 degrees of freedom
# Null hypothesis probability = 7.895766e-01
Photon flux (15-150 keV) in 16.25 sec: 2.32239 ( 4.67761 -0.1474 ) 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) = 1.12e-06
S(50-100 keV) = 1.68e-06
T90 vs. Hardness ratio plot
T90 = 63.9639999866486 sec.
Hardness ratio (energy fluence ratio) = 1.5
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.81129
Count Ratio (50-100 keV) / (15-25 keV) = 1.51601
Mask shadow pattern
IMX = 6.839251754899979E-01, IMY = 6.913365490695917E-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] [']
244.9871 -15.6435 0.6 16.6 -91.0 2.4252 17.9 0.5 Sco X-1
254.5665 35.4135 5.0 50.2 -1.9 -0.5926 -2.3 6.8 Her X-1
255.8300 -37.9349 3.4 24.3 -162.0 -0.4121 -3.4 9.2 4U 1700-377
256.3318 -36.4928 5.0 22.8 -162.0 0.2755 2.3 6.5 GX 349+2
262.8354 -24.6617 3.1 10.4 -177.8 0.4252 3.7 10.7 GX 1+4
264.8943 -44.4183 49.8 30.3 -178.0 0.0357 0.2 6.8 4U 1735-44
268.4112 -1.2992 10.9 14.4 32.4 0.1308 1.1 9.6 SW J1753.5-0127
270.3524 -25.0157 3.9 13.3 151.4 0.3781 3.0 5.3 GX 5-1
270.4450 -25.6064 5.1 13.8 152.6 0.3185 2.5 11.3 GRS 1758-258
274.1469 -14.0205 8.4 11.7 96.3 -0.1753 -1.4 8.3 GX 17+2
275.8759 -30.2716 3.1 20.4 149.9 0.4935 3.7 6.3 H1820-303
285.1735 -25.0313 10.7 24.2 126.0 0.1769 1.1 10.0 HT1900.1-2455
288.9323 10.8158 4.7 36.6 54.2 0.6678 2.5 11.1 GRS 1915+105
263.0821 -33.8858 14.4 19.6 -176.5 0.1011 0.8 5.6 GX 354-0
285.4460 -3.5084 2.5 25.4 73.2 0.7853 4.6 ------ UNKNOWN
264.1887 26.6365 2.9 40.9 8.9 0.7702 4.0 ------ UNKNOWN
263.2367 28.9644 2.6 43.2 7.5 0.9544 4.5 ------ UNKNOWN
236.2837 -53.2106 2.4 44.0 -151.9 1.0558 4.8 ------ 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] [']
245.1302 -15.4983 40.2 16.4 -90.5 -0.0214 -0.3 12.2 Sco X-1
254.5738 35.3582 25.2 50.1 -1.9 0.0691 0.5 5.8 Her X-1
255.9445 -37.8121 6.9 24.2 -162.1 0.1132 1.7 2.8 4U 1700-377
256.2635 -36.4422 6.1 22.8 -161.8 -0.1258 -1.9 8.4 GX 349+2
263.1520 -24.5802 0.0 10.4 -179.4 -0.0474 -0.7 12.6 GX 1+4
264.9065 -44.4438 6.6 30.3 -178.0 0.1266 1.7 7.0 4U 1735-44
268.2202 -1.4547 13.0 14.2 32.0 -0.0583 -0.9 8.9 SW J1753.5-0127
270.4302 -25.2082 11.2 13.5 151.7 -0.0682 -1.0 11.1 GX 5-1
270.2729 -25.5963 7.4 13.7 153.1 -0.1041 -1.6 8.9 GRS 1758-258
273.9102 -14.1715 5.1 11.5 97.0 -0.1546 -2.3 9.8 GX 17+2
276.1156 -30.4805 0.0 20.7 149.8 -0.0652 -1.0 12.0 H1820-303
285.1545 -24.7415 14.7 24.1 125.3 0.0581 0.8 12.5 HT1900.1-2455
288.8864 11.0339 3.0 36.7 53.8 0.4693 3.8 7.4 GRS 1915+105
263.0464 -33.8315 37.7 19.6 -176.4 0.0199 0.3 2.9 GX 354-0
278.2006 20.7114 2.4 38.4 30.8 0.4942 4.8 ------ UNKNOWN
287.8509 -58.0183 2.1 47.8 167.9 0.8247 5.4 ------ UNKNOWN
248.8659 -47.3739 2.8 34.9 -158.3 0.3296 4.1 ------ UNKNOWN
227.9088 14.2161 0.5 44.2 -45.3 4.8901 24.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
96.548630 242.208000
593.048000 722.168000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9794 -15.6478 0.5 34.3 162.1 12.2911 21.6 0.5 Sco X-1
254.4548 35.2074 9.5 31.8 56.1 -0.9150 -1.2 8.1 Her X-1
262.8767 -19.9078 2.3 48.5 146.1 8.9344 5.1 ------ UNKNOWN
246.8508 -27.6874 2.8 45.8 168.5 4.9087 4.1 ------ UNKNOWN
224.2474 55.0816 2.3 41.0 9.0 3.2639 4.9 ------ UNKNOWN
236.0163 6.6507 2.6 11.0 144.9 1.8012 4.5 ------ UNKNOWN
190.7789 58.1928 3.2 52.0 -11.6 3.3803 3.6 ------ UNKNOWN
199.8950 43.8797 3.1 38.1 -21.1 2.1647 3.8 ------ UNKNOWN
216.9561 -39.4100 2.9 54.6 -157.4 5.2821 4.0 ------ UNKNOWN
200.0630 -16.7690 2.9 41.4 -125.3 3.4783 4.0 ------ UNKNOWN
Plot creation:
Wed Sep 23 09:24:56 EDT 2026