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
269.6054 -40.3449 0.0069 10.4 -97.6 1.7872 27.9 TRIG_01310284
------------------------------------------
Foreground time interval of the image:
-2.956 12.877 (delta_t = 15.833 [sec])
Background time interval of the image:
-41.723 -2.956 (delta_t = 38.767 [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 -2.956 sec. to 55.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27177 ( -0.0819313 0.0813494 )
Norm@50keV : 4.00426E-03 ( -0.0001757 0.000175651 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.80 using 59 PHA bins.
# Reduced chi-squared = 0.7159 for 57 degrees of freedom
# Null hypothesis probability = 9.480504e-01
Photon flux (15-150 keV) in 58.05 sec: 0.475323 ( -0.0222292 0.0222886 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.31323e-06 ( -1.09561e-07 1.09895e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.956 sec. to 55.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12773 ( -0.336271 0.186994 )
Epeak [keV] : 332.224 ( -332.229 -332.229 )
Norm@50keV : 4.66731E-03 ( -0.000798975 0.00194064 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.21 using 59 PHA bins.
# Reduced chi-squared = 0.7180 for 56 degrees of freedom
# Null hypothesis probability = 9.448408e-01
Photon flux (15-150 keV) in 58.05 sec: 0.471200 ( -0.023896 0.023385 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29154e-06 ( -1.21458e-07 1.14219e-07 ) ergs/cm2
Band function
Time interval is from -2.956 sec. to 55.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.756709 ( 0.750673 0.750673 )
beta : -1.36800 ( 1.37097 0.143829 )
Epeak [keV] : 102.998 ( -103.859 495.586 )
Norm@50keV : 7.61416E-03 ( -0.00344945 0.0486879 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.87 using 59 PHA bins.
# Reduced chi-squared = 0.7068 for 55 degrees of freedom
# Null hypothesis probability = 9.510525e-01
Photon flux (15-150 keV) in 58.05 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] : 18.3726 ( )
R^2/D10^2 : 2.76895E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 134.86 using 59 PHA bins.
# Reduced chi-squared = 2.3660 for 57 degrees of freedom
# Null hypothesis probability = 2.956567e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.079e-07 1.007e-08
25- 50 5.067e-07 3.306e-08
50-150 1.248e-06 9.665e-08
15-150 1.862e-06 1.001e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-8.08328 -200)
Norm : 2.00022 (-0.0887286 0.0887286)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.892e-07 1.384e-08
25- 50 5.564e-07 3.106e-08
50-150 1.220e-06 6.676e-08
15-150 2.066e-06 1.129e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.73817 (-1.74953 1.82906)
R1^2/D10^2 : 0.154502 (-0.0583476 0.119134)
kT2 [keV] : 40.3751 (-10.0941 27.6702)
R2^2/D10^2 : 1.69083E-03 (-0.00125517 0.00259028)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.921e-07 3.402e-08
25- 50 5.509e-07 6.925e-08
50-150 1.555e-06 6.320e-07
15-150 2.298e-06 6.011e-07
Peak spectrum fit
Power-law model
Time interval is from 7.704 sec. to 8.704 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.679736 ( -0.192362 0.181981 )
Norm@50keV : 1.40113E-02 ( -0.0016302 0.00160353 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.63 using 59 PHA bins.
# Reduced chi-squared = 1.274 for 57 degrees of freedom
# Null hypothesis probability = 7.931910e-02
Photon flux (15-150 keV) in 1 sec: 1.62230 ( -0.176309 0.177193 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.72608e-07 ( -1.86886e-08 1.87533e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.704 sec. to 8.704 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.474790 ( -1.16637 0.88447 )
Epeak [keV] : 136.829 ( -37.0539 214.123 )
Norm@50keV : 3.93655E-02 ( -0.0211207 0.0610951 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.34 using 59 PHA bins.
# Reduced chi-squared = 1.202 for 56 degrees of freedom
# Null hypothesis probability = 1.426505e-01
Photon flux (15-150 keV) in 1 sec: 1.54891 ( -0.18519 0.1858 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.66491e-07 ( -2.0084e-08 1.9884e-08 ) ergs/cm2
Band function
Time interval is from 7.704 sec. to 8.704 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.871957 ( 0.871911 0.871911 )
beta : -0.679717 ( -0.181964 0.192403 )
Epeak [keV] : 13.9501 ( -13.9487 -13.9487 )
Norm@50keV : 2.08439E-02 ( -0.00841559 272290 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.63 using 59 PHA bins.
# Reduced chi-squared = 1.321 for 55 degrees of freedom
# Null hypothesis probability = 5.576418e-02
Photon flux (15-150 keV) in 1 sec: ( ) 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] : 27.5419 (-3.5152 4.47304)
R^2/D10^2 : 3.24652E-02 (-0.0114721 0.0162934)
(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 4.055e-09 8.980e-10
25- 50 2.410e-08 4.320e-09
50-150 1.329e-07 2.140e-08
15-150 1.610e-07 2.405e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 6.33339 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.577e-08 8.870e-09
25- 50 3.034e-08 1.674e-08
50-150 6.654e-08 3.679e-08
15-150 1.126e-07 6.270e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.06705 (-6.89104 -6.89104)
R1^2/D10^2 : 0.382836 (-0.396321 -0.396321)
kT2 [keV] : 30.2850 (-5.01714 -30.2958)
R2^2/D10^2 : 2.35421E-02 (-0.023493 0.00956031)
------------------------------------------------------------
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: 0.905011 ( -0.0957608 0.0937497 )
Norm@50keV : 6.90939E-03 ( -0.000366337 0.000364207 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.08 using 59 PHA bins.
# Reduced chi-squared = 0.7557 for 57 degrees of freedom
# Null hypothesis probability = 9.138437e-01
Photon flux (15-150 keV) in 15.83 sec: 0.793079 ( -0.0421328 0.0422438 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22511e-06 ( -6.52975e-08 6.54591e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.761611 ( -0.383866 0.183589 )
Epeak [keV] : 518.100 ( -518.134 -518.134 )
Norm@50keV : 7.94441E-03 ( -0.00177718 0.00344024 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.61 using 59 PHA bins.
# Reduced chi-squared = 0.7609 for 56 degrees of freedom
# Null hypothesis probability = 9.063548e-01
Photon flux (15-150 keV) in 15.83 sec: 0.787329 ( -0.044356 0.042688 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21749e-06 ( -6.92008e-08 6.75767e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99997 ( -4.99997 -4.99997 )
beta : -0.945983 ( -0.102659 0.1031 )
Epeak [keV] : 28.1388 ( -28.1388 6.0377 )
Norm@50keV : 216.326 ( -10.7752 872853 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.07 using 59 PHA bins.
# Reduced chi-squared = 0.7467 for 55 degrees of freedom
# Null hypothesis probability = 9.186284e-01
Photon flux (15-150 keV) in 15.83 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) = 5.07e-07
S(50-100 keV) = 8.39e-07
T90 vs. Hardness ratio plot
T90 = 52.3880000114441 sec.
Hardness ratio (energy fluence ratio) = 1.65483
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.66406
Count Ratio (50-100 keV) / (15-25 keV) = 1.3452
Mask shadow pattern
IMX = -2.434561992790344E-02, IMY = 1.821764041739740E-01
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:
-41.723400 -2.956000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.3680 -62.7325 331.0 49.6 1.0 -0.0077 -0.0 8.2 GX 301-2
244.9610 -15.6321 0.8 23.5 115.3 1.9587 14.4 1.2 Sco X-1
255.8774 -37.9162 10.0 1.9 2.6 0.1187 1.2 6.7 4U 1700-377
256.2543 -36.3708 11.2 0.8 57.7 0.1052 1.0 9.3 GX 349+2
262.8832 -24.8077 7.5 12.5 170.4 0.1501 1.5 7.8 GX 1+4
264.7914 -44.4531 37.3 9.9 -66.5 0.0295 0.3 2.1 4U 1735-44
268.2967 -1.3374 6.9 36.5 165.1 0.2522 1.7 8.1 SW J1753.5-0127
270.2226 -24.8814 8.3 16.0 -166.1 -0.1364 -1.4 12.3 GX 5-1
270.2338 -25.8795 3.3 15.2 -163.6 0.3393 3.5 9.0 GRS 1758-258
273.8780 -13.9852 19.8 26.9 -175.8 -0.0616 -0.6 8.0 GX 17+2
276.0066 -30.2372 6.9 16.8 -139.8 0.1695 1.7 8.9 H1820-303
284.9296 -24.8815 7.2 26.3 -141.8 -0.1718 -1.6 6.2 HT1900.1-2455
288.8311 10.9689 5.3 55.9 -175.3 -0.8235 -2.2 2.4 GRS 1915+105
262.9416 -33.8285 8.1 5.3 -151.0 0.1386 1.4 2.4 GX 354-0
275.8415 -0.1633 2.6 40.1 176.0 0.7166 4.4 ------ UNKNOWN
296.7601 -5.5134 2.8 47.5 -154.5 0.8533 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-2.956000 12.876590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.7045 -62.8682 7.7 49.5 0.9 0.2282 1.5 6.0 GX 301-2
244.9760 -15.7378 6.5 23.4 115.2 -0.1545 -1.8 5.9 Sco X-1
255.9226 -37.8014 14.0 1.8 3.9 0.0538 0.8 4.0 4U 1700-377
256.4282 -36.2613 4.9 0.7 67.0 0.1545 2.4 9.7 GX 349+2
263.0670 -24.7240 11.8 12.7 171.0 -0.0625 -1.0 3.4 GX 1+4
264.8207 -44.5521 2.9 10.0 -66.3 0.2514 4.0 7.0 4U 1735-44
268.4281 -1.5854 6.1 36.3 165.4 -0.1835 -1.9 8.7 SW J1753.5-0127
270.2678 -24.9027 5.2 16.0 -166.0 0.1430 2.2 10.6 GX 5-1
270.4128 -25.8431 6.1 15.4 -163.3 -0.1262 -1.9 8.5 GRS 1758-258
274.0362 -14.0895 4.2 26.9 -175.4 -0.1872 -2.7 3.6 GX 17+2
276.0156 -30.5644 0.0 16.6 -138.7 -0.0410 -0.7 12.7 H1820-303
284.9738 -24.9313 10.5 26.3 -141.7 0.0808 1.1 3.4 HT1900.1-2455
288.8767 10.9611 7.3 55.9 -175.2 0.4138 1.6 4.7 GRS 1915+105
263.1656 -33.8800 3.9 5.4 -149.6 0.1791 2.9 9.2 GX 354-0
269.6054 -40.3449 0.4 10.4 -97.6 1.7875 28.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
60.476590 208.226000
208.976000 245.336000
245.976000 247.366000
247.976000 697.906000
698.976000 773.456000
774.976000 859.776610
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.6439 -62.6683 5.6 51.8 19.2 6.8044 2.1 6.1 GX 301-2
244.9831 -15.6292 0.8 32.7 115.8 40.1298 14.0 0.7 Sco X-1
256.0301 -37.7109 111.2 10.9 83.5 0.1417 0.1 8.3 4U 1700-377
256.2036 -36.4706 8.2 11.2 89.8 1.9173 1.4 11.5 GX 349+2
263.0286 -24.5957 3.9 16.7 142.5 3.7336 3.0 9.1 GX 1+4
264.6748 -44.5918 4.2 5.6 22.9 3.1550 2.7 9.0 4U 1735-44
268.4499 -1.5739 5.8 38.8 161.9 4.7460 2.0 8.8 SW J1753.5-0127
270.0992 -25.1345 6.1 15.2 165.4 2.3030 1.9 10.6 GX 5-1
270.5045 -25.6378 0.0 14.7 166.9 -0.7647 -0.6 12.6 GRS 1758-258
273.9842 -14.1855 10.5 26.5 173.3 1.3936 1.1 9.0 GX 17+2
275.9727 -30.2227 4.4 11.4 -167.2 3.0088 2.6 9.0 H1820-303
285.2093 -24.7961 0.0 20.3 -151.5 2.1810 1.8 12.0 HT1900.1-2455
288.8680 11.0215 4.2 54.4 -172.8 11.2310 2.7 6.1 GRS 1915+105
263.1424 -33.9214 3.2 8.2 123.1 4.4763 3.6 9.2 GX 354-0
257.6239 -2.4512 2.9 39.4 144.7 13.9092 4.0 ------ UNKNOWN
Plot creation:
Mon May 5 20:47:56 EDT 2025