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
107.3153 26.9512 0.0097 21.6749 35.3397 0.9820134 19.796 TRIG_00676595
Foreground time interval of the image:
-0.008 17.917 (delta_t = 17.925 [sec])
Background time interval of the image:
-787.183 -771.961 (delta_t = 15.222 [sec])
-239.384 -0.008 (delta_t = 239.376 [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 1.024000
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 1.024000
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 1.024000
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 -0.008 sec. to 119.580 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30100 ( -0.108959 0.108439 )
Norm@50keV : 1.63628E-03 ( -9.60421e-05 9.60146e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.18 using 59 PHA bins.
# Reduced chi-squared = 0.7224 for 57 degrees of freedom
# Null hypothesis probability = 9.432745e-01
Photon flux (15-150 keV) in 119.6 sec: 0.195251 ( -0.011913 0.011944 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.93362e-06 ( -1.26276e-07 1.27014e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.008 sec. to 119.580 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29721 ( -0.382289 0.178346 )
Epeak [keV] : 9995.80 ( -9995.31 -9995.31 )
Norm@50keV : 1.64313E-03 ( -9.63514e-05 0.00100994 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.17 using 59 PHA bins.
# Reduced chi-squared = 0.7352 for 56 degrees of freedom
# Null hypothesis probability = 9.310547e-01
Photon flux (15-150 keV) in 119.6 sec: 0.195000 ( -0.012839 0.012292 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.93055e-06 ( -1.42367e-07 1.31845e-07 ) ergs/cm2
Band function
Time interval is from -0.008 sec. to 119.580 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.07099 ( 1.07099 1.07099 )
beta : -1.30100 ( -0.108445 0.108991 )
Epeak [keV] : 33.5218 ( -33.5205 -33.5205 )
Norm@50keV : 3.11272E-03 ( -0.00157209 0.738712 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.18 using 59 PHA bins.
# Reduced chi-squared = 0.7486 for 55 degrees of freedom
# Null hypothesis probability = 9.167002e-01
Photon flux (15-150 keV) in 119.6 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] : 17.9235 (-1.41653 1.58501)
R^2/D10^2 : 1.22862E-02 (-0.00303663 0.00394891)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 103.55 using 59 PHA bins.
# Reduced chi-squared = 1.8166 for 57 degrees of freedom
# Null hypothesis probability = 1.606933e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.464e-08 1.128e-08
25- 50 4.363e-07 3.737e-08
50-150 1.016e-06 1.122e-07
15-150 1.547e-06 1.142e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-14.7876 -200)
Norm : 0.810557 (-0.0480248 0.0480248)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.78 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 57 degrees of freedom
# Null hypothesis probability = 4.461858e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.414e-07 1.644e-08
25- 50 4.643e-07 3.618e-08
50-150 1.018e-06 2.055e-07
15-150 1.724e-06 2.518e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.52957 (-1.90531 2.65105)
R1^2/D10^2 : 0.215175 (-0.138832 0.579041)
kT2 [keV] : 27.3769 (-4.92272 11.4649)
R2^2/D10^2 : 2.59857E-03 (-0.00175838 0.00254449)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.91 using 59 PHA bins.
# Reduced chi-squared = 0.8530 for 55 degrees of freedom
# Null hypothesis probability = 7.727827e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.015e-07 7.046e-08
25- 50 4.225e-07 9.030e-08
50-150 1.269e-06 2.414e-07
15-150 1.894e-06 4.071e-07
Peak spectrum fit
Power-law model
Time interval is from -0.008 sec. to 0.992 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.382976 ( -0.272879 0.250281 )
Norm@50keV : 9.63035E-03 ( -0.00155281 0.00147929 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.19 using 59 PHA bins.
# Reduced chi-squared = 0.7402 for 57 degrees of freedom
# Null hypothesis probability = 9.286025e-01
Photon flux (15-150 keV) in 1 sec: 1.16583 ( -0.14684 0.14803 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37553e-07 ( -1.64988e-08 1.65106e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.008 sec. to 0.992 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.374378 ( -0.385419 0.249536 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 9.72986E-03 ( -0.00157272 0.00785558 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.22 using 59 PHA bins.
# Reduced chi-squared = 0.7539 for 56 degrees of freedom
# Null hypothesis probability = 9.136209e-01
Photon flux (15-150 keV) in 1 sec: 1.16764 ( -0.13787 0.14649 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.72888e-10 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.008 sec. to 0.992 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.676612 ( 0.67635 0.67635 )
beta : -0.382982 ( -0.250566 0.272997 )
Epeak [keV] : 19.3925 ( -19.3939 -19.3939 )
Norm@50keV : 1.34655E-02 ( -0.00511657 93452.5 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.19 using 59 PHA bins.
# Reduced chi-squared = 0.7671 for 55 degrees of freedom
# Null hypothesis probability = 8.973463e-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] : 40.7786 (-7.81556 12.4906)
R^2/D10^2 : 8.54953E-03 (-0.00400827 0.00624988)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.59 using 59 PHA bins.
# Reduced chi-squared = 0.8350 for 57 degrees of freedom
# Null hypothesis probability = 8.082458e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.809e-09 5.170e-10
25- 50 1.241e-08 3.227e-09
50-150 1.214e-07 2.650e-08
15-150 1.357e-07 3.261e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-19.6443 -200)
Norm : 4.49327 (-0.623337 0.623337)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 104.56 using 59 PHA bins.
# Reduced chi-squared = 1.8344 for 57 degrees of freedom
# Null hypothesis probability = 1.253376e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.119e-08 6.375e-09
25- 50 2.153e-08 1.206e-08
50-150 4.721e-08 2.648e-08
15-150 7.993e-08 4.500e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.83853 (-1.65259 2.66036)
R1^2/D10^2 : 8.11190 (-7.39741 198.716)
kT2 [keV] : 46.5336 (-10.176 18.9544)
R2^2/D10^2 : 6.04853E-03 (-0.00321694 0.00509223)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.62 using 59 PHA bins.
# Reduced chi-squared = 0.6658 for 55 degrees of freedom
# Null hypothesis probability = 9.733278e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.532e-09 3.966e-09
25- 50 1.267e-08 3.787e-09
50-150 1.220e-07 3.998e-08
15-150 1.422e-07 4.573e-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: 1.05539 ( -0.150309 0.147085 )
Norm@50keV : 3.57888E-03 ( -0.000281457 0.000280495 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.60 using 59 PHA bins.
# Reduced chi-squared = 0.8702 for 57 degrees of freedom
# Null hypothesis probability = 7.460499e-01
Photon flux (15-150 keV) in 17.92 sec: 0.413522 ( -0.0336113 0.0336869 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.80397e-07 ( -5.75694e-08 5.78468e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05547 ( -0.156277 0.143557 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 3.59519E-03 ( -0.000283766 0.00146011 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.64 using 59 PHA bins.
# Reduced chi-squared = 0.8863 for 56 degrees of freedom
# Null hypothesis probability = 7.129946e-01
Photon flux (15-150 keV) in 17.92 sec: 0.413913 ( -0.034179 0.033158 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.78851e-07 ( -5.60251e-08 5.8593e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.876293 ( 0.876326 0.876326 )
beta : -1.05538 ( 1.05538 0.150293 )
Epeak [keV] : 48.1331 ( -48.0987 -48.0987 )
Norm@50keV : 5.98849E-03 ( -0.00268833 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.60 using 59 PHA bins.
# Reduced chi-squared = 0.9019 for 55 degrees of freedom
# Null hypothesis probability = 6.802303e-01
Photon flux (15-150 keV) in 17.92 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) = 4.31e-07
S(50-100 keV) = 7.00e-07
T90 vs. Hardness ratio plot
T90 = 98.9079999923706 sec.
Hardness ratio (energy fluence ratio) = 1.62413
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.35997
Count Ratio (50-100 keV) / (15-25 keV) = 1.17215
Mask shadow pattern
IMX = 3.242073016236385E-01, IMY = -2.298890802045160E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
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:
-787.183400 -771.961400
-239.384000 -0.008000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6318 22.0142 0.2 16.4 -34.9 10.5889 54.3 0.1 Crab
134.4779 10.4815 3.1 39.7 86.8 3.4717 3.7 ------ UNKNOWN
92.0826 36.5656 2.6 27.5 -1.5 0.9774 4.5 ------ UNKNOWN
80.7434 61.3776 2.9 53.2 -5.8 2.2083 4.0 ------ UNKNOWN
62.6885 -20.9474 2.4 43.2 -132.2 2.3952 4.8 ------ UNKNOWN
50.8183 22.9950 3.0 43.8 -64.0 4.2249 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.008000 17.916590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.7789 22.1780 0.0 16.4 -34.2 0.1489 3.3 12.7 Crab
107.3153 26.9512 0.6 21.7 35.3 0.9820 19.8 ------ UNKNOWN
96.6223 -48.0676 2.3 57.3 -179.7 1.3448 4.9 ------ UNKNOWN
93.9367 -12.9028 2.0 22.1 -177.0 0.2548 5.8 ------ UNKNOWN
55.3440 56.3326 2.4 56.1 -22.6 0.8806 4.9 ------ UNKNOWN
52.2276 13.3678 2.5 41.4 -77.9 0.8640 4.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
62.116610 949.916600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6333 22.0205 0.2 22.1 -107.6 37.2313 59.8 0.4 Crab
115.2800 64.2915 3.1 37.7 -4.2 3.1108 3.7 ------ UNKNOWN
116.2055 71.5212 2.4 44.8 -5.9 4.9693 4.8 ------ UNKNOWN
68.9371 -9.7386 3.0 52.3 -139.2 11.5141 3.8 ------ UNKNOWN
56.8037 43.5004 3.1 43.7 -64.0 11.5280 3.7 ------ UNKNOWN
61.2034 27.3767 3.9 40.8 -88.3 8.6557 3.0 ------ UNKNOWN
Plot creation:
Fri Mar 18 11:29:43 EDT 2016