Click here for the BAT GCN circular template
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
147.6056 9.3677 0.0064 23.5169 108.6988 8.2639196 30.181 TRIG_00675361
Foreground time interval of the image:
-6.000 182.040 (delta_t = 188.040 [sec])
Background time interval of the image:
-271.051 -251.860 (delta_t = 19.192 [sec])
-239.152 -6.000 (delta_t = 233.152 [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
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
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 4.096000
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 4.096000
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 -6.000 sec. to 182.040 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35449 ( -0.0729432 0.072692 )
Norm@50keV : 2.85939E-03 ( -0.000115399 0.000115391 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.56 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 57 degrees of freedom
# Null hypothesis probability = 4.542259e-01
Photon flux (15-150 keV) in 188 sec: 0.344798 ( -0.014661 0.014689 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.24563e-06 ( -2.30552e-07 2.31306e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.000 sec. to 182.040 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.957906 ( -0.309207 0.2884 )
Epeak [keV] : 139.844 ( -39.1668 207.937 )
Norm@50keV : 4.41148E-03 ( -0.00116567 0.00171362 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.91 using 59 PHA bins.
# Reduced chi-squared = 0.9269 for 56 degrees of freedom
# Null hypothesis probability = 6.304206e-01
Photon flux (15-150 keV) in 188 sec: 0.337159 ( -0.015625 0.015636 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.0988e-06 ( -2.55766e-07 2.54943e-07 ) ergs/cm2
Band function
Time interval is from -6.000 sec. to 182.040 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -7.58889E-02 ( -1.00857 0.155961 )
beta : -1.48036 ( 1.48067 0.120756 )
Epeak [keV] : 53.9768 ( -26.4605 161.735 )
Norm@50keV : 1.69684E-02 ( -0.0175707 61.4705 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.25 using 59 PHA bins.
# Reduced chi-squared = 0.9319 for 55 degrees of freedom
# Null hypothesis probability = 6.185252e-01
Photon flux (15-150 keV) in 188 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] : 17.2793 ( )
R^2/D10^2 : 2.44470E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 154.44 using 59 PHA bins.
# Reduced chi-squared = 2.7094 for 57 degrees of freedom
# Null hypothesis probability = 6.382224e-11
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.782e-07 2.228e-08
25- 50 1.247e-06 7.351e-08
50-150 2.672e-06 2.059e-07
15-150 4.197e-06 1.861e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-9.22744 -200)
Norm : 1.43859 (-0.0583229 0.0583229)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.61 using 59 PHA bins.
# Reduced chi-squared = 1.309 for 57 degrees of freedom
# Null hypothesis probability = 5.870299e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.736e-07 3.130e-08
25- 50 1.296e-06 5.762e-08
50-150 2.842e-06 1.194e-07
15-150 4.811e-06 2.143e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.81336 (-1.21021 1.36793)
R1^2/D10^2 : 0.212392 (-0.082052 0.153636)
kT2 [keV] : 28.2851 (-3.80435 6.01272)
R2^2/D10^2 : 3.70453E-03 (-0.00181024 0.00256648)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.05 using 59 PHA bins.
# Reduced chi-squared = 0.9282 for 55 degrees of freedom
# Null hypothesis probability = 6.262921e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.232e-07 8.573e-08
25- 50 1.270e-06 1.432e-07
50-150 3.311e-06 5.320e-07
15-150 5.105e-06 7.501e-07
Peak spectrum fit
Power-law model
Time interval is from 109.948 sec. to 110.948 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17113 ( -0.132572 0.131866 )
Norm@50keV : 2.66357E-02 ( -0.00207207 0.00207127 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.36 using 59 PHA bins.
# Reduced chi-squared = 0.9537 for 57 degrees of freedom
# Null hypothesis probability = 5.746667e-01
Photon flux (15-150 keV) in 1 sec: 3.11439 ( -0.24521 0.24534 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.72515e-07 ( -2.40187e-08 2.41935e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 109.948 sec. to 110.948 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.860491 ( -0.561646 0.374452 )
Epeak [keV] : 195.401 ( -195.403 -195.403 )
Norm@50keV : 3.76609E-02 ( -0.0125082 0.0313741 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.27 using 59 PHA bins.
# Reduced chi-squared = 0.9513 for 56 degrees of freedom
# Null hypothesis probability = 5.787432e-01
Photon flux (15-150 keV) in 1 sec: 3.08280 ( -0.25105 0.25073 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.67424e-07 ( -2.59335e-08 2.56856e-08 ) ergs/cm2
Band function
Time interval is from 109.948 sec. to 110.948 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -3.21720E-02 ( 0.149955 0.149955 )
beta : -1.32627 ( 1.32365 0.219772 )
Epeak [keV] : 64.8603 ( -63.5417 174.099 )
Norm@50keV : 0.126547 ( -0.13685 779.418 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.21 using 59 PHA bins.
# Reduced chi-squared = 0.9493 for 55 degrees of freedom
# Null hypothesis probability = 5.818461e-01
Photon flux (15-150 keV) in 1 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] : 18.4553 (-1.90635 2.18422)
R^2/D10^2 : 0.189533 (-0.0578574 0.081419)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.76 using 59 PHA bins.
# Reduced chi-squared = 1.469 for 57 degrees of freedom
# Null hypothesis probability = 1.203727e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.282e-08 1.950e-09
25- 50 6.039e-08 6.255e-09
50-150 1.502e-07 2.215e-08
15-150 2.234e-07 2.180e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-17.3069 -200)
Norm : 12.6498 (-1.00578 1.00578)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.69 using 59 PHA bins.
# Reduced chi-squared = 1.310 for 57 degrees of freedom
# Null hypothesis probability = 5.797726e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.149e-08 3.900e-09
25- 50 6.058e-08 7.945e-09
50-150 1.329e-07 6.729e-08
15-150 2.249e-07 7.070e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.88168 (-2.30186 2.83681)
R1^2/D10^2 : 1.23748 (-0.648647 1.76453)
kT2 [keV] : 34.5228 (-8.93907 32.0468)
R2^2/D10^2 : 1.97679E-02 (-0.0166019 0.0351037)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.44 using 59 PHA bins.
# Reduced chi-squared = 0.9534 for 55 degrees of freedom
# Null hypothesis probability = 5.731651e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.224e-08 8.960e-09
25- 50 6.120e-08 2.269e-08
50-150 1.867e-07 8.874e-08
15-150 2.701e-07 1.123e-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: 1.35449 ( -0.0729432 0.072692 )
Norm@50keV : 2.85939E-03 ( -0.000115399 0.000115391 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.56 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 57 degrees of freedom
# Null hypothesis probability = 4.542259e-01
Photon flux (15-150 keV) in 188 sec: 0.344793 ( -0.0146603 0.0146876 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.24501e-06 ( -2.30623e-07 2.31342e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.957908 ( -0.309209 0.288398 )
Epeak [keV] : 139.844 ( -39.1672 207.936 )
Norm@50keV : 4.41147E-03 ( -0.00116566 0.00171363 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.91 using 59 PHA bins.
# Reduced chi-squared = 0.9269 for 56 degrees of freedom
# Null hypothesis probability = 6.304206e-01
Photon flux (15-150 keV) in 188 sec: 0.337129 ( -0.01562 0.015632 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.10087e-06 ( -2.563e-07 2.55116e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -7.52756E-02 ( -1.02315 0.155195 )
beta : -1.48037 ( 1.48063 0.120686 )
Epeak [keV] : 53.9640 ( -26.4561 161.743 )
Norm@50keV : 1.69844E-02 ( -0.0175829 61.4723 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.25 using 59 PHA bins.
# Reduced chi-squared = 0.9319 for 55 degrees of freedom
# Null hypothesis probability = 6.185304e-01
Photon flux (15-150 keV) in 188 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) = 1.20e-06
S(50-100 keV) = 1.88e-06
T90 vs. Hardness ratio plot
T90 = 134.863999962807 sec.
Hardness ratio (energy fluence ratio) = 1.56667
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.56494
Count Ratio (50-100 keV) / (15-25 keV) = 1.32373
Mask shadow pattern
IMX = -1.395107656193708E-01, IMY = -4.121941653993130E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
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:
-271.051400 -251.859800
-239.152000 -6.000000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6361 22.0261 0.4 41.2 -41.3 10.1608 28.7 0.7 Crab
135.5385 -40.5546 2.9 49.6 -167.6 2.0244 4.0 0.5 Vela X-1
134.9240 -43.6213 2.3 52.5 -166.0 2.7954 5.0 ------ UNKNOWN
68.8843 31.4010 2.6 56.2 -33.2 5.4925 4.5 ------ UNKNOWN
71.9876 23.5415 2.8 52.0 -42.1 4.4863 4.1 ------ UNKNOWN
88.8673 -14.3101 4.9 41.2 -98.4 2.2025 2.4 ------ UNKNOWN
98.9275 -33.1175 2.1 47.4 -127.2 4.8369 5.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-6.000000 182.040000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.7548 22.0805 89.5 41.1 -41.1 -0.0419 -0.1 7.8 Crab
135.4518 -40.4234 4.6 49.5 -167.5 1.0703 2.5 8.6 Vela X-1
163.8269 10.3743 2.3 39.5 107.3 3.8455 5.1 ------ UNKNOWN
147.6057 9.3678 0.4 23.5 108.7 8.2643 30.2 ------ UNKNOWN
75.9864 31.9345 2.2 50.5 -30.6 2.5834 5.1 ------ UNKNOWN
112.6985 -37.0544 2.6 46.1 -143.5 1.8314 4.4 ------ UNKNOWN
104.0304 -39.1178 2.7 50.5 -135.9 3.7870 4.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
449.948600 603.048000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.2221 -60.4832 5.1 25.0 123.0 3.6827 2.2 8.8 Cen X-3
186.5583 -62.9390 104.3 25.6 142.0 0.1664 0.1 10.5 GX 301-2
264.8108 -44.3360 10.4 54.5 -156.0 4.5211 1.1 7.4 4U 1735-44
198.3702 -41.0084 2.7 48.6 142.4 21.1924 4.2 ------ UNKNOWN
231.2515 -63.4745 2.7 32.1 -178.6 5.5104 4.3 ------ UNKNOWN
61.3118 -57.0677 2.8 28.1 -18.5 4.8233 4.2 ------ UNKNOWN
55.1414 -30.5829 3.1 54.8 -15.5 13.1691 3.7 ------ UNKNOWN
45.5648 -34.4086 3.3 52.7 -26.2 9.0648 3.5 ------ UNKNOWN
295.8953 -52.0557 2.5 48.0 -129.0 19.6431 4.6 ------ UNKNOWN
Plot creation:
Fri Mar 18 11:35:15 EDT 2016