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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
256.7957 23.9450 0.0073 33.4596 -26.3777 1.9366919 26.644 TRIG_00540255
Foreground time interval of the image:
-2.184 19.008 (delta_t = 21.192 [sec])
Background time interval of the image:
-239.976 -2.184 (delta_t = 237.792 [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 -2.184 sec. to 19.008 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59637 ( -0.105843 0.106687 )
Norm@50keV : 5.68865E-03 ( -0.000361193 0.000359741 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.92 using 59 PHA bins.
# Reduced chi-squared = 0.8583 for 57 degrees of freedom
# Null hypothesis probability = 7.679357e-01
Photon flux (15-150 keV) in 21.19 sec: 0.730196 ( -0.0457047 0.0457704 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12783e-06 ( -7.66315e-08 7.71187e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.184 sec. to 19.008 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.903736 ( -0.519037 0.459164 )
Epeak [keV] : 75.9935 ( -15.0018 54.7253 )
Norm@50keV : 1.30250E-02 ( -0.00541015 0.0109672 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.93 using 59 PHA bins.
# Reduced chi-squared = 0.7488 for 56 degrees of freedom
# Null hypothesis probability = 9.186046e-01
Photon flux (15-150 keV) in 21.19 sec: 0.706600 ( -0.04833 0.048268 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06406e-06 ( -8.74596e-08 8.78749e-08 ) ergs/cm2
Band function
Time interval is from -2.184 sec. to 19.008 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.507585 ( -0.763219 4.8546 )
beta : -1.99753 ( 1.99231 0.30426 )
Epeak [keV] : 58.4232 ( -28.7839 42.4976 )
Norm@50keV : 2.28644E-02 ( -0.0258144 104.179 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.38 using 59 PHA bins.
# Reduced chi-squared = 0.7341 for 55 degrees of freedom
# Null hypothesis probability = 9.300507e-01
Photon flux (15-150 keV) in 21.19 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07288e-06 ( -1.07273e-06 -8.47219e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.6482 (-0.969634 1.05783)
R^2/D10^2 : 0.113892 (-0.0270749 0.0350054)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.92 using 59 PHA bins.
# Reduced chi-squared = 1.402 for 57 degrees of freedom
# Null hypothesis probability = 2.429099e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.516e-08 1.124e-08
25- 50 3.449e-07 2.649e-08
50-150 4.175e-07 5.255e-08
15-150 8.576e-07 6.304e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 165.511 (-42.7881 -165.624)
Norm : 3.00600 (-0.203879 0.225703)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.49 using 59 PHA bins.
# Reduced chi-squared = 0.7631 for 57 degrees of freedom
# Null hypothesis probability = 9.061757e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.621e-07 1.418e-08
25- 50 3.046e-07 4.577e-08
50-150 6.253e-07 2.671e-07
15-150 1.092e-06 2.613e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.37516 (-2.14658 2.01545)
R1^2/D10^2 : 0.436576 (-0.196262 0.59328)
kT2 [keV] : 27.0008 (-7.53508 21.9793)
R2^2/D10^2 : 6.63439E-03 (-0.00565694 0.0180714)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.57 using 59 PHA bins.
# Reduced chi-squared = 0.7741 for 55 degrees of freedom
# Null hypothesis probability = 8.893635e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.382e-07 3.034e-08
25- 50 3.298e-07 7.064e-08
50-150 6.052e-07 2.675e-07
15-150 1.073e-06 3.160e-07
Peak spectrum fit
Power-law model
Time interval is from -0.016 sec. to 0.984 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72098 ( -0.283661 0.299794 )
Norm@50keV : 9.11056E-03 ( -0.00173943 0.00169979 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.06 using 59 PHA bins.
# Reduced chi-squared = 0.8958 for 57 degrees of freedom
# Null hypothesis probability = 6.963907e-01
Photon flux (15-150 keV) in 1 sec: 1.21899 ( -0.207208 0.207366 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.42216e-08 ( -1.64495e-08 1.68548e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.016 sec. to 0.984 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.780148 ( -1.59207 1.10045 )
Epeak [keV] : 58.5394 ( -14.3728 -58.5396 )
Norm@50keV : 2.98130E-02 ( -0.0298125 0.195314 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.20 using 59 PHA bins.
# Reduced chi-squared = 0.8786 for 56 degrees of freedom
# Null hypothesis probability = 7.278901e-01
Photon flux (15-150 keV) in 1 sec: 1.17957 ( -0.10714 0.2133 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.79025e-08 ( -1.76108e-08 1.86422e-08 ) ergs/cm2
Band function
Time interval is from -0.016 sec. to 0.984 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.81208 ( -0.959213 1.17496 )
beta : -1.96325 ( 9.37016 19.3702 )
Epeak [keV] : 28.0712 ( -18.953 577.612 )
Norm@50keV : 88.3631 ( -88.4213 202.108 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.00 using 59 PHA bins.
# Reduced chi-squared = 0.8909 for 55 degrees of freedom
# Null hypothesis probability = 7.019627e-01
Photon flux (15-150 keV) in 1 sec: 1.18150 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.79251e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.2075 (-2.28676 2.83735)
R^2/D10^2 : 0.284124 (-0.151926 0.322582)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.14 using 59 PHA bins.
# Reduced chi-squared = 0.9498 for 57 degrees of freedom
# Null hypothesis probability = 5.830195e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.966e-09 2.922e-09
25- 50 2.879e-08 7.960e-09
50-150 2.609e-08 1.071e-08
15-150 6.384e-08 1.652e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 116.381 (-53.0595 -114.993)
Norm : 5.25033 (-0.989941 1.41992)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.65 using 59 PHA bins.
# Reduced chi-squared = 0.8711 for 57 degrees of freedom
# Null hypothesis probability = 7.443688e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.369e-08 5.403e-09
25- 50 2.436e-08 1.357e-08
50-150 4.282e-08 2.956e-08
15-150 8.087e-08 4.776e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.87103 (-2.98808 67.512)
R1^2/D10^2 : 2.22233 (-1.8628 35.273)
kT2 [keV] : 18.1898 (-5.72597 55.1905)
R2^2/D10^2 : 5.10720E-02 (-0.0504688 0.188289)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.88 using 59 PHA bins.
# Reduced chi-squared = 0.8888 for 55 degrees of freedom
# Null hypothesis probability = 7.060822e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.323e-08 7.885e-09
25- 50 2.509e-08 1.286e-08
50-150 3.863e-08 2.262e-08
15-150 7.695e-08 4.035e-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: 1.59637 ( -0.105843 0.106687 )
Norm@50keV : 5.68865E-03 ( -0.000361193 0.000359741 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.92 using 59 PHA bins.
# Reduced chi-squared = 0.8583 for 57 degrees of freedom
# Null hypothesis probability = 7.679357e-01
Photon flux (15-150 keV) in 21.19 sec: 0.730196 ( -0.0457047 0.0457704 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12783e-06 ( -7.66315e-08 7.71187e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.903736 ( -0.519037 0.459164 )
Epeak [keV] : 75.9935 ( -15.0018 54.7253 )
Norm@50keV : 1.30250E-02 ( -0.00541015 0.0109672 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.93 using 59 PHA bins.
# Reduced chi-squared = 0.7488 for 56 degrees of freedom
# Null hypothesis probability = 9.186046e-01
Photon flux (15-150 keV) in 21.19 sec: 0.706600 ( -0.04833 0.048268 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06406e-06 ( -8.74596e-08 8.78749e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.507585 ( -0.763219 4.8546 )
beta : -1.99753 ( 1.99231 0.30426 )
Epeak [keV] : 58.4232 ( -28.7839 42.4976 )
Norm@50keV : 2.28644E-02 ( -0.0258144 105.418 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.38 using 59 PHA bins.
# Reduced chi-squared = 0.7341 for 55 degrees of freedom
# Null hypothesis probability = 9.300507e-01
Photon flux (15-150 keV) in 21.19 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07288e-06 ( -1.07273e-06 -8.47219e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 2.92e-07
S(50-100 keV) = 3.86e-07
T90 vs. Hardness ratio plot
T90 = 19.5359999537468 sec.
Hardness ratio (energy fluence ratio) = 1.32192
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.41257
Count Ratio (50-100 keV) / (15-25 keV) = 0.966976
Mask shadow pattern
IMX = 5.920643393936137E-01, IMY = 2.936165033805292E-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:
-239.976000 -2.184000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4080 35.3244 2.3 40.7 -11.3 1.4325 4.9 2.7 Her X-1
263.0475 -24.7270 4.8 41.0 -112.3 1.7881 2.5 2.4 GX 1+4
268.4151 -1.3110 2.8 21.6 -83.6 1.0060 4.2 9.0 SW J1753.5-0127
270.3478 -25.1413 3.9 37.6 -121.3 1.0884 3.0 5.1 GX 5-1
270.1528 -25.6617 9.5 38.2 -121.5 -0.4704 -1.2 9.5 GRS 1758-258
274.0789 -14.0757 3.5 26.3 -116.4 0.9047 3.3 4.9 GX 17+2
276.0487 -30.2940 52.2 40.3 -132.0 -0.0921 -0.2 7.8 H1820-303
285.1846 -24.8758 4.2 33.4 -143.4 -0.7281 -2.8 8.5 HT1900.1-2455
288.8083 10.9563 1.0 2.7 53.5 2.2776 11.1 0.9 GRS 1915+105
299.6169 35.0596 10.9 28.8 52.6 -0.3275 -1.0 8.6 Cyg X-1
308.2068 40.9625 3.5 37.2 58.0 1.7899 3.3 4.4 Cyg X-3
259.6815 55.6429 2.3 52.2 12.6 3.8313 5.0 ------ UNKNOWN
265.5120 31.3636 2.5 30.9 -6.8 1.1180 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-2.184000 19.008000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3988 35.3151 2.4 40.7 -11.3 -0.4059 -4.8 3.3 Her X-1
262.8466 -24.6774 10.3 41.1 -112.0 -0.2119 -1.1 9.8 GX 1+4
268.1676 -1.4194 0.0 21.9 -83.5 0.0727 1.1 12.2 SW J1753.5-0127
270.2808 -25.0838 76.7 37.6 -121.2 0.0163 0.2 0.3 GX 5-1
270.3016 -25.7431 22.9 38.2 -121.7 -0.0573 -0.5 0.0 GRS 1758-258
273.7932 -13.9934 0.0 26.4 -115.8 0.1839 2.6 12.6 GX 17+2
275.9953 -30.2248 3.4 40.3 -131.9 -0.3558 -3.4 9.3 H1820-303
285.1251 -25.0383 25.2 33.6 -143.3 -0.0360 -0.5 8.6 HT1900.1-2455
288.7321 11.0085 35.1 2.8 51.6 -0.0184 -0.3 5.4 GRS 1915+105
299.6338 35.3689 5.1 29.1 52.4 0.1840 2.3 10.3 Cyg X-1
308.2159 41.0736 7.4 37.3 58.0 -0.2256 -1.6 8.7 Cyg X-3
256.7965 23.9454 0.4 33.5 -26.4 1.9431 26.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
274.724600 706.124660
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5270 -40.5599 1.1 39.3 -175.9 5.0375 10.3 0.3 Vela X-1
170.2584 -60.6234 3.1 34.5 -126.9 2.0408 3.7 1.7 Cen X-3
186.6576 -62.7596 2.4 37.4 -114.1 3.8598 4.7 0.6 GX 301-2
93.4448 -47.9333 2.8 21.9 131.2 1.7461 4.2 ------ UNKNOWN
11.9277 -50.6704 2.7 37.4 14.9 1.9882 4.2 ------ UNKNOWN
152.4143 -58.2977 0.4 30.4 -142.6 11.8023 30.2 ------ UNKNOWN
327.2431 -44.5140 3.0 57.1 -17.3 5.4795 3.8 ------ UNKNOWN
Plot creation:
Sat May 30 17:46:28 EDT 2015