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
252.6855 -86.8749 0.0067 17.2 3.6 1.5468 28.6 TRIG_01299776
------------------------------------------
Foreground time interval of the image:
-0.164 11.197 (delta_t = 11.361 [sec])
Background time interval of the image:
-179.504 -0.164 (delta_t = 179.340 [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 -0.164 sec. to 14.332 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71727 ( -0.0956383 0.0968023 )
Norm@50keV : 6.84509E-03 ( -0.000394999 0.000392444 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.90 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 57 degrees of freedom
# Null hypothesis probability = 1.962476e-01
Photon flux (15-150 keV) in 14.5 sec: 0.914659 ( -0.0496794 0.0497311 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.17783e-07 ( -5.53192e-08 5.57038e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.164 sec. to 14.332 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24338 ( -0.418129 0.379223 )
Epeak [keV] : 74.1508 ( -16.3614 98.8459 )
Norm@50keV : 1.22473E-02 ( -0.00446368 0.00803196 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.23 using 59 PHA bins.
# Reduced chi-squared = 1.093 for 56 degrees of freedom
# Null hypothesis probability = 2.939255e-01
Photon flux (15-150 keV) in 14.5 sec: 0.893223 ( -0.052426 0.052395 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.77936e-07 ( -6.34549e-08 6.38667e-08 ) ergs/cm2
Band function
Time interval is from -0.164 sec. to 14.332 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.24338 ( -0.328164 0.410868 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 74.1369 ( -14.0907 99.3364 )
Norm@50keV : 1.22459E-02 ( -0.00446394 0.00804202 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.23 using 59 PHA bins.
# Reduced chi-squared = 1.113 for 55 degrees of freedom
# Null hypothesis probability = 2.624681e-01
Photon flux (15-150 keV) in 14.5 sec: 0.895582 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.92343e-07 ( -8.92242e-07 -5.72982e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.5306 ( )
R^2/D10^2 : 0.186581 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 130.82 using 59 PHA bins.
# Reduced chi-squared = 2.2951 for 57 degrees of freedom
# Null hypothesis probability = 9.852022e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.007e-08 9.207e-09
25- 50 2.979e-07 1.943e-08
50-150 2.892e-07 3.538e-08
15-150 6.772e-07 4.205e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 123.496 (-26.1459 35.3705)
Norm : 3.85877 (-0.259163 0.306847)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.456e-07 1.280e-08
25- 50 2.617e-07 1.957e-08
50-150 4.736e-07 1.405e-07
15-150 8.808e-07 1.502e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.48883 (-1.07079 1.24408)
R1^2/D10^2 : 1.34901 (-0.59028 1.18782)
kT2 [keV] : 22.2715 (-3.62495 6.02092)
R2^2/D10^2 : 1.70900E-02 (-0.0102048 0.0174766)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.441e-07 2.381e-08
25- 50 2.634e-07 4.539e-08
50-150 4.644e-07 1.127e-07
15-150 8.719e-07 1.712e-07
Peak spectrum fit
Power-law model
Time interval is from 0.260 sec. to 1.260 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59309 ( -0.0995177 0.100489 )
Norm@50keV : 3.13509E-02 ( -0.00192915 0.00191941 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.51 using 59 PHA bins.
# Reduced chi-squared = 1.132 for 57 degrees of freedom
# Null hypothesis probability = 2.308430e-01
Photon flux (15-150 keV) in 1 sec: 4.02017 ( -0.237642 0.237795 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.93448e-07 ( -1.94229e-08 1.95465e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.260 sec. to 1.260 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09181 ( -0.44226 0.397948 )
Epeak [keV] : 85.7147 ( -21.0238 132.177 )
Norm@50keV : 5.78377E-02 ( -0.0218246 0.0405305 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.75 using 59 PHA bins.
# Reduced chi-squared = 1.067 for 56 degrees of freedom
# Null hypothesis probability = 3.409479e-01
Photon flux (15-150 keV) in 1 sec: 3.94222 ( -0.24565 0.24548 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.81302e-07 ( -2.1452e-08 2.1834e-08 ) ergs/cm2
Band function
Time interval is from 0.260 sec. to 1.260 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.76225 ( -5.48172 -4.76225 )
beta : -1.74436 ( -0.129942 0.123764 )
Epeak [keV] : 26.5094 ( -2.91181 2.73818 )
Norm@50keV : 1721.12 ( -99.4364 4627.73 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.06 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 55 degrees of freedom
# Null hypothesis probability = 4.722271e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.86114e-07 ( -2.86107e-07 -1.9939e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.2081 ( )
R^2/D10^2 : 0.706424 ( )
(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 2.613e-08 3.085e-09
25- 50 9.153e-08 6.165e-09
50-150 1.019e-07 1.347e-08
15-150 2.196e-07 1.580e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 167.915 (-42.3096 -167.916)
Norm : 16.5572 (-1.05402 1.14923)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.207e-08 3.450e-09
25- 50 7.922e-08 1.124e-08
50-150 1.635e-07 5.798e-08
15-150 2.848e-07 7.580e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.77645 (-1.38957 1.46698)
R1^2/D10^2 : 3.23267 (-1.31024 2.71767)
kT2 [keV] : 27.7903 (-6.3011 12.8955)
R2^2/D10^2 : 3.51075E-02 (-0.0251854 0.0576158)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.903e-08 8.085e-09
25- 50 8.410e-08 1.403e-08
50-150 1.622e-07 7.204e-08
15-150 2.853e-07 8.325e-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: 1.72568 ( -0.0911371 0.0921949 )
Norm@50keV : 8.31189E-03 ( -0.000458395 0.000455608 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.10 using 59 PHA bins.
# Reduced chi-squared = 1.370 for 57 degrees of freedom
# Null hypothesis probability = 3.324357e-02
Photon flux (15-150 keV) in 11.36 sec: 1.11400 ( -0.0578845 0.0579447 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.72602e-07 ( -5.01383e-08 5.04718e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20096 ( -0.401857 0.365873 )
Epeak [keV] : 70.5675 ( -13.7464 54.4188 )
Norm@50keV : 1.58386E-02 ( -0.00562135 0.00989206 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.85 using 59 PHA bins.
# Reduced chi-squared = 1.283 for 56 degrees of freedom
# Null hypothesis probability = 7.521556e-02
Photon flux (15-150 keV) in 11.36 sec: 1.08518 ( -0.06106 0.06106 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.30982e-07 ( -5.73635e-08 5.78565e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.20095 ( -0.318363 0.409422 )
beta : -10.0000 ( 10 1.06581e-14 )
Epeak [keV] : 70.5542 ( -11.9932 54.356 )
Norm@50keV : 1.58371E-02 ( -0.00561921 0.00990376 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.85 using 59 PHA bins.
# Reduced chi-squared = 1.306 for 55 degrees of freedom
# Null hypothesis probability = 6.309925e-02
Photon flux (15-150 keV) in 11.36 sec: 1.08780 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.47369e-15 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 2.50e-07
S(50-100 keV) = 3.04e-07
T90 vs. Hardness ratio plot
T90 = 11.271999835968 sec.
Hardness ratio (energy fluence ratio) = 1.216
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.29329
Count Ratio (50-100 keV) / (15-25 keV) = 0.783895
Mask shadow pattern
IMX = 3.093429333188491E-01, IMY = -1.968498043503954E-02
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:
-179.504000 -0.164000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.5114 -60.7466 5.7 39.6 46.2 2.4994 2.0 9.4 Cen X-3
186.4965 -62.9233 7.5 33.6 54.5 1.5253 1.5 10.2 GX 301-2
255.7459 -37.9423 0.0 34.1 147.3 1.6402 1.7 12.8 4U 1700-377
256.4235 -36.2733 10.1 35.6 148.8 -1.1637 -1.1 9.0 GX 349+2
263.1892 -24.6186 0.0 46.2 160.6 3.6514 2.2 12.4 GX 1+4
264.9526 -44.4159 6.9 26.4 158.2 1.1038 1.7 9.2 4U 1735-44
270.3091 -25.0744 3.6 45.1 169.5 4.1630 3.2 1.4 GX 5-1
270.3300 -25.7296 3.4 44.5 169.5 4.1761 3.4 1.7 GRS 1758-258
274.0909 -14.0575 32.0 56.0 174.8 1.3154 0.4 5.1 GX 17+2
276.0556 -30.4231 16.0 39.6 176.8 -0.6982 -0.7 7.5 H1820-303
285.0304 -24.9403 96.0 45.3 -171.6 0.1361 0.1 1.2 HT1900.1-2455
262.9719 -33.8811 25.1 37.0 158.5 0.4575 0.5 2.9 GX 354-0
118.7734 -56.0578 2.9 53.0 13.6 10.1959 4.0 ------ UNKNOWN
118.9965 -58.2179 1.9 50.9 13.4 9.5492 6.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.164000 11.196600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.3108 -60.6259 26.0 39.8 46.1 -0.0527 -0.4 0.2 Cen X-3
186.3602 -62.8154 1264.1 33.7 54.5 -0.0008 -0.0 8.6 GX 301-2
256.2116 -37.7422 8.4 34.2 148.0 0.1234 1.4 12.3 4U 1700-377
256.2525 -36.4325 11.2 35.5 148.6 0.0948 1.0 8.9 GX 349+2
262.9332 -24.8838 13.5 45.9 160.2 -0.1175 -0.9 9.3 GX 1+4
264.9636 -44.3850 8.6 26.4 158.2 -0.0859 -1.3 10.2 4U 1735-44
270.3963 -25.1211 4.3 45.1 169.7 -0.3016 -2.7 6.6 GX 5-1
270.3009 -25.6229 5.6 44.6 169.5 -0.2321 -2.0 7.2 GRS 1758-258
273.9691 -14.0051 7.3 56.0 174.7 0.5225 1.6 2.8 GX 17+2
275.8379 -30.3628 9.2 39.7 176.5 0.1101 1.2 4.5 H1820-303
284.9271 -24.9833 12.3 45.2 -171.7 0.0955 0.9 7.0 HT1900.1-2455
262.9789 -33.7778 15.6 37.1 158.5 0.0632 0.7 3.4 GX 354-0
163.7646 -65.9901 2.3 36.7 37.6 0.4885 4.9 ------ UNKNOWN
252.6853 -86.8749 0.4 17.2 3.6 1.5470 28.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
61.596600 209.996600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
169.9981 -60.6555 7.9 29.1 65.8 -0.6128 -1.5 9.5 Cen X-3
186.5792 -62.6819 3.6 26.2 82.2 1.2388 3.2 5.7 GX 301-2
255.8467 -37.8174 5.5 49.1 157.4 -1.7084 -2.1 6.8 4U 1700-377
256.3474 -36.4213 3.5 50.5 157.9 2.9353 3.3 4.3 GX 349+2
264.9194 -44.4290 118.3 42.5 167.0 0.0496 0.1 7.7 4U 1735-44
276.0140 -30.4343 5.2 56.7 178.2 -2.6464 -2.2 6.1 H1820-303
263.0291 -33.9895 0.0 52.9 164.9 0.9834 1.0 9.5 GX 354-0
64.6548 -38.7888 3.0 54.3 -33.6 5.9396 3.9 ------ UNKNOWN
Plot creation:
Wed Apr 2 22:05:33 EDT 2025