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
256.4365 -37.8129 0.0720 0.1 -72.1 -0.0424 -2.7 TRIG_01218297
------------------------------------------
Foreground time interval of the image:
71.892 73.601 (delta_t = 1.709 [sec])
Background time interval of the image:
-239.000 71.892 (delta_t = 310.892 [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 64.000000
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 64.000000
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 64.000000
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
Multiple GTIs in the spectrum
tstart tstop
71.892000 118.310000
119.000000 152.156000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.44782 ( -0.181295 0.192633 )
Norm@50keV : 1.20325E-03 ( -0.000170328 0.00016972 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.48 using 59 PHA bins.
# Reduced chi-squared = 0.8505 for 57 degrees of freedom
# Null hypothesis probability = 7.817630e-01
Photon flux (15-150 keV) in 79.57 sec: 0.229021 ( -0.0210628 0.0210651 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.44575e-07 ( -1.03096e-07 1.05727e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
71.892000 118.310000
119.000000 152.156000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.649965 ( -1.15583 0.956428 )
Epeak [keV] : 26.5860 ( -10.7923 5.19754 )
Norm@50keV : 1.65001E-02 ( -0.0164995 0.0745603 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.58 using 59 PHA bins.
# Reduced chi-squared = 0.6532 for 56 degrees of freedom
# Null hypothesis probability = 9.792680e-01
Photon flux (15-150 keV) in 79.57 sec: 0.218234 ( -0.021281 0.021371 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.24886e-07 ( -9.39642e-08 1.03855e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
71.892000 118.310000
119.000000 152.156000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.649229 ( -0.258317 0.594285 )
beta : -10.00000 ( 10 9.4122e-06 )
Epeak [keV] : 26.5817 ( -3.70202 5.20745 )
Norm@50keV : 1.65204E-02 ( -0.00149075 0.0747173 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.58 using 59 PHA bins.
# Reduced chi-squared = 0.6651 for 55 degrees of freedom
# Null hypothesis probability = 9.736149e-01
Photon flux (15-150 keV) in 79.57 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] : 7.81646 (-0.735908 0.800412)
R^2/D10^2 : 0.275542 (-0.0916384 0.140173)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.60 using 59 PHA bins.
# Reduced chi-squared = 0.8001 for 57 degrees of freedom
# Null hypothesis probability = 8.609349e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.380e-07 3.624e-08
25- 50 3.999e-07 4.770e-08
50-150 9.722e-08 2.814e-08
15-150 7.351e-07 7.826e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 33.3198 (-6.1949 8.19362)
Norm : 1.69946 (-0.29256 0.364158)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.893e-07 3.457e-08
25- 50 3.494e-07 3.939e-08
50-150 2.187e-07 6.640e-08
15-150 8.574e-07 9.982e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.00337 (-1.42581 1.64928)
R1^2/D10^2 : 2.24989 (-1.65584 15.3023)
kT2 [keV] : 10.2629 (-1.78918 3.34592)
R2^2/D10^2 : 6.87899E-02 (-0.0537375 0.10111)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.819e-07 1.481e-07
25- 50 3.644e-07 1.897e-07
50-150 1.724e-07 1.012e-07
15-150 8.186e-07 4.197e-07
Peak spectrum fit
Power-law model
Time interval is from 78.428 sec. to 79.428 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.28078 ( -0.5976 0.771943 )
Norm@50keV : 3.04130E-03 ( -0.00145023 0.00134927 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.47 using 59 PHA bins.
# Reduced chi-squared = 1.429 for 57 degrees of freedom
# Null hypothesis probability = 1.839901e-02
Photon flux (15-150 keV) in 1 sec: 0.525870 ( -0.15851 0.158512 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.89624e-08 ( -1.06401e-08 1.14175e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 78.428 sec. to 79.428 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96324 ( )
Epeak [keV] : 4.93826 ( )
Norm@50keV : 4.62428E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.54 using 59 PHA bins.
# Reduced chi-squared = 1.456 for 56 degrees of freedom
# Null hypothesis probability = 1.454896e-02
Photon flux (15-150 keV) in 1 sec: 0.525739 ( -0.158515 0.158421 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.89114e-08 ( -1.14264e-08 8.6321e-09 ) ergs/cm2
Band function
Time interval is from 78.428 sec. to 79.428 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.65870 ( 2.6587 2.6587 )
beta : -2.28081 ( -0.771915 0.598349 )
Epeak [keV] : 22.5389 ( -22.5389 -22.5389 )
Norm@50keV : 0.413349 ( -0.197151 0.183391 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.47 using 59 PHA bins.
# Reduced chi-squared = 1.481 for 55 degrees of freedom
# Null hypothesis probability = 1.172376e-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] : 8.59417 (-2.81192 3.89842)
R^2/D10^2 : 0.422659 (-0.421342 1.65683)
(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 5.923e-09 3.679e-09
25- 50 1.169e-08 7.295e-09
50-150 3.867e-09 2.808e-09
15-150 2.149e-08 1.300e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 44.0278 (-24.6317 97.6697)
Norm : 3.17676 (-1.43207 3.26386)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.516e-09 4.005e-09
25- 50 1.029e-08 5.954e-09
50-150 8.814e-09 6.455e-09
15-150 2.662e-08 1.578e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.08253 (-2.0479 19.5388)
R1^2/D10^2 : 287.416 (-282.586 -283.073)
kT2 [keV] : 10.8499 (-3.95004 187.884)
R2^2/D10^2 : 0.148446 (-0.147659 0.461329)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.581e-09 4.244e-09
25- 50 1.000e-08 6.155e-09
50-150 7.020e-09 5.010e-09
15-150 2.461e-08 1.335e-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: 2.84170 ( -1.40123 3.39709 )
Norm@50keV : 8.49721E-04 ( -0.000849094 0.00119066 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.88 using 59 PHA bins.
# Reduced chi-squared = 1.472 for 57 degrees of freedom
# Null hypothesis probability = 1.176116e-02
Photon flux (15-150 keV) in 1.709 sec: 0.208802 ( -0.208802 0.121333 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62894e-08 ( -1.16123e-08 1.57828e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.91847 ( 9.97569 11.9836 )
Epeak [keV] : 18.3193 ( -4.96857 5.22484 )
Norm@50keV : 6.46261E+07 ( -7.39403e+07 4.16517e+09 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.89 using 59 PHA bins.
# Reduced chi-squared = 1.498 for 56 degrees of freedom
# Null hypothesis probability = 9.289612e-03
Photon flux (15-150 keV) in 1.709 sec: 0.207350 ( -0.121711 0.121921 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.61637e-08 ( -1.20377e-08 1.56245e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.73700 ( 2.737 2.737 )
beta : -2.84285 ( -3.39731 1.40254 )
Epeak [keV] : 28.1231 ( -28.1231 -28.1231 )
Norm@50keV : 0.115385 ( -0.115391 0.161842 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.88 using 59 PHA bins.
# Reduced chi-squared = 1.525 for 55 degrees of freedom
# Null hypothesis probability = 7.303355e-03
Photon flux (15-150 keV) in 1.709 sec: 0.208659 ( 6.79134 -0.208659 ) 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) = 3.12e-07
S(50-100 keV) = 2.28e-07
T90 vs. Hardness ratio plot
T90 = 55.2879998683929 sec.
Hardness ratio (energy fluence ratio) = 0.730769
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.890191
Count Ratio (50-100 keV) / (15-25 keV) = 0.188037
Mask shadow pattern
IMX = 6.169839837219584E-04, IMY = 1.914317306203843E-03
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
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:
-239.000000 71.892000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.6576 -62.7744 53.5 47.9 31.6 0.3171 0.2 0.2 GX 301-2
244.8446 -15.5742 3.9 24.4 148.7 -2.0303 -3.0 8.7 Sco X-1
256.1620 -37.9963 10.8 0.3 22.2 -0.6151 -1.1 12.3 4U 1700-377
256.2426 -36.4982 4.7 1.3 174.2 -1.4004 -2.5 10.3 GX 349+2
262.8472 -24.5940 0.0 14.3 -158.9 -0.6009 -1.0 12.7 GX 1+4
264.9575 -44.5929 0.0 9.4 -44.6 -1.1516 -2.0 12.6 4U 1735-44
268.4827 -1.4909 5.1 38.0 -163.6 1.7580 2.3 7.3 SW J1753.5-0127
270.1765 -24.9361 12.1 17.4 -137.1 0.5589 1.0 10.4 GX 5-1
270.3648 -25.8691 746.1 16.8 -134.6 -0.0090 -0.0 8.3 GRS 1758-258
273.8727 -14.1108 6.2 28.3 -145.6 1.3383 1.9 8.9 GX 17+2
276.1197 -30.4867 4.7 17.9 -111.8 -1.4624 -2.4 12.4 H1820-303
284.9213 -24.8047 7.5 27.5 -113.5 -1.2121 -1.5 9.3 HT1900.1-2455
263.1581 -33.8373 192.4 6.8 -126.9 -0.0350 -0.1 8.4 GX 354-0
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
71.892000 73.600600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.9132 -62.8239 5.1 47.8 31.6 0.1203 2.3 7.7 GX 301-2
244.9465 -15.7213 17.6 24.2 148.8 0.0128 0.7 5.2 Sco X-1
256.0795 -37.7341 5.1 0.2 98.0 -0.0357 -2.2 7.9 4U 1700-377
256.5878 -36.2804 17.9 1.5 -174.9 0.0100 0.6 11.3 GX 349+2
263.1701 -24.7707 27.6 14.3 -157.5 0.0071 0.4 8.9 GX 1+4
264.8415 -44.2981 9.1 9.2 -45.6 0.0192 1.3 10.0 4U 1735-44
268.3318 -1.5123 4.9 37.9 -163.9 -0.0497 -2.3 4.2 SW J1753.5-0127
270.4604 -25.2194 0.0 17.4 -135.8 0.0423 2.5 12.7 GX 5-1
270.4560 -25.6406 5.2 17.1 -134.9 -0.0493 -2.8 10.3 GRS 1758-258
273.8483 -13.9358 5.4 28.5 -145.8 0.0390 2.1 11.0 GX 17+2
275.7292 -30.2409 0.0 17.7 -113.0 0.0259 1.3 12.7 H1820-303
285.1351 -25.0437 10.8 27.5 -112.8 0.0256 1.1 9.1 HT1900.1-2455
263.1675 -33.6852 0.0 6.9 -127.9 0.0224 1.4 12.6 GX 354-0
336.4776 -65.4395 2.3 52.2 -34.9 0.3385 5.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
346.500590 391.270000
392.000000 395.640000
397.000000 442.310000
443.000000 620.100590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
32.6736 72.9814 3.4 52.8 26.5 5.1882 3.4 ------ UNKNOWN
23.1303 67.4739 2.8 48.1 20.9 3.1736 4.1 ------ UNKNOWN
16.2665 60.9489 2.2 43.5 13.3 3.9807 5.3 ------ UNKNOWN
13.7794 16.5653 3.4 23.4 -66.6 1.5557 3.4 ------ UNKNOWN
Plot creation:
Sun Mar 3 05:09:02 EST 2024