Special notes of this burst
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
330.1353 -76.6702 0.0090 38.1911 -143.3517 1.7453922 21.499 TRIG_00889785
Foreground time interval of the image:
-0.120 10.381 (delta_t = 10.501 [sec])
Background time interval of the image:
-239.120 -0.120 (delta_t = 239.000 [sec])
Lightcurves
Notes:
- 1) The mask-weighted light curves are using the flight position.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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)
Quad-rate summed light curves (from T0-300s to T0+1000s)
Spectral Evolution
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using 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.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from -0.120 sec. to 11.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.03061 ( -0.132559 0.137789 )
Norm@50keV : 8.88649E-03 ( -0.000809824 0.000798624 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.69 using 59 PHA bins.
# Reduced chi-squared = 1.591 for 57 degrees of freedom
# Null hypothesis probability = 3.007259e-03
Photon flux (15-150 keV) in 12 sec: 1.35219 ( -0.10071 0.10077 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.85374e-07 ( -8.3738e-08 8.47922e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.120 sec. to 11.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.775417 ( -0.861485 0.70867 )
Epeak [keV] : 40.0953 ( -6.28147 7.01425 )
Norm@50keV : 4.73217E-02 ( -0.028753 0.105022 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.30 using 59 PHA bins.
# Reduced chi-squared = 1.434 for 56 degrees of freedom
# Null hypothesis probability = 1.829973e-02
Photon flux (15-150 keV) in 12 sec: 1.29015 ( -0.10546 0.10589 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.81681e-07 ( -9.23279e-08 9.79474e-08 ) ergs/cm2
Band function
Time interval is from -0.120 sec. to 11.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 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] : 9.86359 (-0.749347 0.814558)
R^2/D10^2 : 0.673690 (-0.179717 0.243215)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 95.67 using 59 PHA bins.
# Reduced chi-squared = 1.678 for 57 degrees of freedom
# Null hypothesis probability = 1.018643e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.594e-07 1.992e-08
25- 50 3.887e-07 3.096e-08
50-150 1.949e-07 3.996e-08
15-150 7.430e-07 6.564e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 61.7472 (-11.9676 16.1501)
Norm : 7.02762 (-0.834714 0.904003)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.73 using 59 PHA bins.
# Reduced chi-squared = 1.434 for 57 degrees of freedom
# Null hypothesis probability = 1.753675e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.129e-07 2.178e-08
25- 50 3.269e-07 2.538e-08
50-150 3.808e-07 7.224e-08
15-150 9.206e-07 8.940e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.76681 (-1.91436 1.32059)
R1^2/D10^2 : 1.36878 (-0.492257 1.53886)
kT2 [keV] : 24.5629 (-10.595 44.1263)
R2^2/D10^2 : 9.27085E-03 (-0.00809884 0.0878255)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.48 using 59 PHA bins.
# Reduced chi-squared = 1.427 for 55 degrees of freedom
# Null hypothesis probability = 2.050186e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.869e-07 3.942e-08
25- 50 3.571e-07 9.054e-08
50-150 3.659e-07 1.695e-07
15-150 9.100e-07 2.824e-07
Peak spectrum fit
Power-law model
Time interval is from 1.880 sec. to 2.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86970 ( -0.211614 0.226112 )
Norm@50keV : 1.80287E-02 ( -0.0029241 0.00286686 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.61 using 59 PHA bins.
# Reduced chi-squared = 1.397 for 57 degrees of freedom
# Null hypothesis probability = 2.563886e-02
Photon flux (15-150 keV) in 1 sec: 2.55482 ( -0.34886 0.3489 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65764e-07 ( -2.64291e-08 2.68687e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.880 sec. to 2.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.501238 ( -2.25263 1.43495 )
Epeak [keV] : 43.2104 ( -6.12201 10.5987 )
Norm@50keV : 0.437649 ( -0.45185 9.80023 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.49 using 59 PHA bins.
# Reduced chi-squared = 1.241 for 56 degrees of freedom
# Null hypothesis probability = 1.062866e-01
Photon flux (15-150 keV) in 1 sec: 2.47245 ( -0.35215 0.35269 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43747e-07 ( -2.53284e-08 2.82021e-08 ) ergs/cm2
Band function
Time interval is from 1.880 sec. to 2.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 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] : 10.6207 (-1.26572 1.44215)
R^2/D10^2 : 1.07477 (-0.413106 0.646585)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.37 using 59 PHA bins.
# Reduced chi-squared = 1.234 for 57 degrees of freedom
# Null hypothesis probability = 1.099441e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.513e-08 5.870e-09
25- 50 6.787e-08 1.091e-08
50-150 4.206e-08 1.365e-08
15-150 1.351e-07 2.490e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 77.6648 (-24.7374 45.5982)
Norm : 12.4964 (-2.2059 2.6682)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.26 using 59 PHA bins.
# Reduced chi-squared = 1.303 for 57 degrees of freedom
# Null hypothesis probability = 6.203311e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.236e-08 6.155e-09
25- 50 5.289e-08 7.910e-09
50-150 7.317e-08 3.707e-08
15-150 1.584e-07 3.965e-08
Double BB
#Fit statistic : Chi-Squared = 67.88 using 59 PHA bins.
#Fit statistic : Chi-Squared = 67.87 using 59 PHA bins.
#Fit statistic : Chi-Squared = 67.85 using 59 PHA bins.
# Reduced chi-squared = 1.273 for 55 degrees of freedom
# Reduced chi-squared = 1.235 for 55 degrees of freedom
# Reduced chi-squared = 1.234 for 55 degrees of freedom
# Reduced chi-squared = 1.234 for 55 degrees of freedom
# Reduced chi-squared = 1.234 for 55 degrees of freedom
# Null hypothesis probability = 8.360412e-02
# Null hypothesis probability = 1.133742e-01
# Null hypothesis probability = 1.138397e-01
# Null hypothesis probability = 1.140872e-01
# Null hypothesis probability = 1.143627e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.640e-08 9.379e-09
25- 50 6.630e-08 2.309e-08
50-150 4.388e-08 1.765e-08
15-150 1.366e-07 4.451e-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: 2.00966 ( -0.128188 0.132809 )
Norm@50keV : 9.84273E-03 ( -0.000871439 0.000860643 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 96.41 using 59 PHA bins.
# Reduced chi-squared = 1.691 for 57 degrees of freedom
# Null hypothesis probability = 8.625131e-04
Photon flux (15-150 keV) in 10.5 sec: 1.48300 ( -0.10861 0.108674 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.53583e-07 ( -7.96154e-08 8.05162e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.576609 ( -0.887685 0.730758 )
Epeak [keV] : 40.4837 ( -5.03485 6.24621 )
Norm@50keV : 6.70989E-02 ( -0.0417783 0.158556 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.18 using 59 PHA bins.
# Reduced chi-squared = 1.485 for 56 degrees of freedom
# Null hypothesis probability = 1.067228e-02
Photon flux (15-150 keV) in 10.5 sec: 1.40984 ( -0.11346 0.11381 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.41702e-07 ( -8.63341e-08 9.23013e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 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) = 2.99e-07
S(50-100 keV) = 2.93e-07
T90 vs. Hardness ratio plot
T90 = 10 sec.
Hardness ratio (energy fluence ratio) = 0.979933
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.28055
Count Ratio (50-100 keV) / (15-25 keV) = 0.600678
Mask shadow pattern
IMX = -6.311577760349268E-01, IMY = 4.695657479227315E-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:
-239.120000 -0.120000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.1571 -60.6493 5.1 44.8 151.7 -1.8807 -2.3 4.9 Cen X-3
186.9112 -62.7407 3.8 49.0 161.3 2.7952 3.1 7.2 GX 301-2
86.4758 -5.6580 3.0 52.3 29.8 5.0467 3.9 ------ UNKNOWN
180.1996 -58.1628 2.5 50.2 154.0 4.7202 4.6 ------ UNKNOWN
95.1514 -44.3058 2.5 18.0 68.1 1.3296 4.5 ------ UNKNOWN
241.3735 -64.5817 2.6 57.7 -171.4 6.7074 4.4 ------ UNKNOWN
357.5974 -65.3765 2.8 35.6 -120.1 1.9191 4.1 ------ UNKNOWN
19.3388 -35.8731 3.6 42.3 -68.9 4.0704 3.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.120000 10.380600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.5567 -60.6272 5.0 44.9 151.8 -0.3068 -2.3 7.1 Cen X-3
186.9598 -62.7142 9.0 49.1 161.3 -0.1933 -1.3 9.0 GX 301-2
80.7240 -5.2503 1.9 52.2 22.6 1.0534 6.1 ------ UNKNOWN
205.0691 -60.1765 2.3 56.2 168.2 1.3274 5.0 ------ UNKNOWN
64.4611 -14.1312 2.5 43.9 0.5 0.3670 4.7 ------ UNKNOWN
259.7251 -71.1364 2.2 51.6 -162.6 0.7326 5.1 ------ UNKNOWN
330.1354 -76.6702 0.5 38.2 -143.4 1.7453 21.5 ------ UNKNOWN
341.6834 -75.8537 2.4 36.2 -140.0 0.3546 4.8 ------ UNKNOWN
274.6603 -65.0998 2.5 56.8 -154.8 1.4722 4.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
67.380570 962.924600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.6338 -62.9459 0.0 38.5 112.7 8.6627 1.2 10.6 GX 301-2
255.9228 -37.8050 13.7 49.8 -178.0 5.1486 0.8 3.8 4U 1700-377
256.5206 -36.3739 5.4 51.0 -176.8 14.2657 2.1 5.1 GX 349+2
264.8194 -44.4213 5.8 41.4 -171.8 -8.2012 -2.0 3.7 4U 1735-44
275.8834 -30.2616 5.7 52.7 -155.0 16.1880 2.0 6.7 H1820-303
262.9464 -33.9564 11.4 51.9 -169.5 -6.9889 -1.0 7.6 GX 354-0
97.3418 -50.2838 2.9 48.7 44.3 28.8518 4.1 ------ UNKNOWN
221.3293 -47.9699 3.2 47.7 145.9 35.1117 3.6 ------ UNKNOWN
Plot creation:
Thu Mar 21 16:31:13 EDT 2019