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
287.0265 -38.0346 0.0176 18.4199 68.6073 0.1063044 10.909 TRIG_00505926
Foreground time interval of the image:
-0.040 0.392 (delta_t = 0.432 [sec])
Background time interval of the image:
-28.443 -0.040 (delta_t = 28.403 [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 0.256000
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 0.256000
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 0.256000
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)
The mask-weighted light curves based on cleaned DPHs
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 -0.040 sec. to 0.392 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38215 ( -0.264783 0.263305 )
Norm@50keV : 1.50394E-02 ( -0.00222714 0.00222054 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.10 using 59 PHA bins.
# Reduced chi-squared = 0.9141 for 57 degrees of freedom
# Null hypothesis probability = 6.589261e-01
Photon flux (15-150 keV) in 0.432 sec: 1.82424 ( -0.276081 0.27686 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.3012e-08 ( -1.02909e-08 1.03975e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.040 sec. to 0.392 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37427 ( -0.299337 0.265755 )
Epeak [keV] : 9998.93 ( -9999.33 -9999.33 )
Norm@50keV : 1.50868E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.11 using 59 PHA bins.
# Reduced chi-squared = 0.9305 for 56 degrees of freedom
# Null hypothesis probability = 6.229231e-01
Photon flux (15-150 keV) in 0.432 sec: 1.82536 ( -0.27777 0.27339 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.2767e-08 ( -1.00349e-08 1.05244e-08 ) ergs/cm2
Band function
Time interval is from -0.040 sec. to 0.392 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.67066 ( -4.67066 -4.67066 )
beta : -1.45268 ( -0.31327 0.293165 )
Epeak [keV] : 24.3819 ( -24.3819 9.01922 )
Norm@50keV : 957.180 ( -140.038 7.14539e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.61 using 59 PHA bins.
# Reduced chi-squared = 0.9384 for 55 degrees of freedom
# Null hypothesis probability = 6.048702e-01
Photon flux (15-150 keV) in 0.432 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] : 15.8806 (-3.88727 5.65236)
R^2/D10^2 : 0.166612 (-0.164019 0.274851)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.18 using 59 PHA bins.
# Reduced chi-squared = 1.231 for 57 degrees of freedom
# Null hypothesis probability = 1.127649e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.759e-09 1.153e-09
25- 50 1.572e-08 4.180e-09
50-150 2.763e-08 8.551e-09
15-150 4.711e-08 1.140e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 7.53578 (-1.11333 1.11324)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.98 using 59 PHA bins.
# Reduced chi-squared = 0.9470 for 57 degrees of freedom
# Null hypothesis probability = 5.890651e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.109e-09 4.687e-09
25- 50 1.560e-08 8.707e-09
50-150 3.421e-08 1.888e-08
15-150 5.792e-08 3.236e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.83382 (-2.11512 2.60434)
R1^2/D10^2 : 1.47178 (-0.92788 2.95196)
kT2 [keV] : 41.7542 (-15.948 -41.7556)
R2^2/D10^2 : 6.03743E-03 (-0.00518174 0.0208217)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.69 using 59 PHA bins.
# Reduced chi-squared = 0.9034 for 55 degrees of freedom
# Null hypothesis probability = 6.772112e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.512e-09 4.255e-09
25- 50 1.564e-08 8.479e-09
50-150 4.241e-08 2.334e-08
15-150 6.556e-08 3.346e-08
Peak spectrum fit
Power-law model
Time interval is from -0.316 sec. to 0.684 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41630 ( -0.361069 0.36219 )
Norm@50keV : 7.08742E-03 ( -0.00138676 0.00137382 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.07 using 59 PHA bins.
# Reduced chi-squared = 1.159 for 57 degrees of freedom
# Null hypothesis probability = 1.921262e-01
Photon flux (15-150 keV) in 1 sec: 0.866362 ( -0.169454 0.170109 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.82589e-08 ( -1.47958e-08 1.50926e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.316 sec. to 0.684 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40832 ( -0.361905 0.366274 )
Epeak [keV] : 9998.95 ( -9999.34 -9999.34 )
Norm@50keV : 7.11096E-03 ( -0.00139184 0.0184422 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.08 using 59 PHA bins.
# Reduced chi-squared = 1.180 for 56 degrees of freedom
# Null hypothesis probability = 1.679144e-01
Photon flux (15-150 keV) in 1 sec: 0.866762 ( -0.170056 0.169178 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.81355e-08 ( -1.50923e-08 1.50199e-08 ) ergs/cm2
Band function
Time interval is from -0.316 sec. to 0.684 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.12782 ( 1.1279 1.1279 )
beta : -1.41406 ( 1.41667 0.361276 )
Epeak [keV] : 56.7558 ( -56.8232 -56.8232 )
Norm@50keV : 1.25247E-02 ( -0.00680914 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.07 using 59 PHA bins.
# Reduced chi-squared = 1.201 for 55 degrees of freedom
# Null hypothesis probability = 1.458015e-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] : 16.5268 (-4.41905 6.36016)
R^2/D10^2 : 6.87888E-02 (-0.0453453 0.132408)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.14 using 59 PHA bins.
# Reduced chi-squared = 1.318 for 57 degrees of freedom
# Null hypothesis probability = 5.399247e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.855e-09 1.854e-09
25- 50 1.667e-08 6.954e-09
50-150 3.220e-08 1.455e-08
15-150 5.273e-08 1.783e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-96.0984 -199.363)
Norm : 3.55469 (-0.681838 0.681855)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.91 using 59 PHA bins.
# Reduced chi-squared = 1.174 for 57 degrees of freedom
# Null hypothesis probability = 1.732946e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.851e-09 5.160e-09
25- 50 1.703e-08 9.895e-09
50-150 3.734e-08 2.171e-08
15-150 6.322e-08 3.640e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.71129 (-4.08825 5.10766)
R1^2/D10^2 : 1.06145 (-0.890935 70.435)
kT2 [keV] : 30.8324 (-13.1603 -30.8391)
R2^2/D10^2 : 7.29471E-03 (-0.00718341 0.041686)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.40 using 59 PHA bins.
# Reduced chi-squared = 1.207 for 55 degrees of freedom
# Null hypothesis probability = 1.394682e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.403e-09 5.080e-09
25- 50 1.590e-08 8.735e-09
50-150 4.549e-08 2.656e-08
15-150 6.979e-08 3.739e-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: 1.38215 ( -0.264783 0.263305 )
Norm@50keV : 1.50394E-02 ( -0.00222714 0.00222054 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.10 using 59 PHA bins.
# Reduced chi-squared = 0.9141 for 57 degrees of freedom
# Null hypothesis probability = 6.589261e-01
Photon flux (15-150 keV) in 0.432 sec: 1.82424 ( -0.276081 0.27686 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.3012e-08 ( -1.02909e-08 1.03975e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37427 ( -0.299337 0.265755 )
Epeak [keV] : 9998.93 ( -9999.33 -9999.33 )
Norm@50keV : 1.50868E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.11 using 59 PHA bins.
# Reduced chi-squared = 0.9305 for 56 degrees of freedom
# Null hypothesis probability = 6.229231e-01
Photon flux (15-150 keV) in 0.432 sec: 1.82536 ( -0.27777 0.27339 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.2767e-08 ( -1.00349e-08 1.05244e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.67066 ( -4.67066 -4.67066 )
beta : -1.45268 ( -0.31327 0.293165 )
Epeak [keV] : 24.3819 ( -24.3819 9.01922 )
Norm@50keV : 957.180 ( -140.038 7.14539e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.61 using 59 PHA bins.
# Reduced chi-squared = 0.9384 for 55 degrees of freedom
# Null hypothesis probability = 6.048702e-01
Photon flux (15-150 keV) in 0.432 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) = 1.47e-08
S(50-100 keV) = 2.25e-08
T90 vs. Hardness ratio plot
T90 = 0.38400000333786 sec.
Hardness ratio (energy fluence ratio) = 1.53061
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.32298
Count Ratio (50-100 keV) / (15-25 keV) = 0.954208
Mask shadow pattern
IMX = 1.214797225773311E-01, IMY = -3.100959680103157E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
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:
-28.443410 -0.040000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.4632 -60.7141 5.1 53.7 -150.9 0.5032 2.3 7.0 Cen X-3
186.6168 -62.7648 1.8 45.9 -149.6 0.8096 6.2 1.1 GX 301-2
244.9676 -15.6658 1.2 33.2 -43.2 0.7845 9.9 1.7 Sco X-1
255.9384 -37.8365 2.6 9.2 -52.4 0.2384 4.5 2.3 4U 1700-377
256.6589 -36.3108 0.0 10.1 -44.3 0.1207 2.3 12.7 GX 349+2
262.9394 -24.7449 5.5 20.0 -11.1 -0.1207 -2.1 3.8 GX 1+4
264.8628 -44.6127 3.9 0.6 71.5 0.1682 2.9 11.0 4U 1735-44
268.2596 -1.4409 5.5 43.4 -2.0 0.2128 2.1 6.5 SW J1753.5-0127
270.2815 -25.1161 3.8 20.2 8.4 0.1771 3.1 2.2 GX 5-1
270.4337 -25.6188 3.5 19.8 9.1 0.2093 3.7 10.3 GRS 1758-258
274.1255 -13.8960 6.8 32.0 10.6 0.1182 1.7 10.9 GX 17+2
275.8708 -30.3318 4.3 17.1 28.8 0.1585 2.7 3.5 H1820-303
285.1306 -25.0484 4.3 26.0 39.8 0.1895 2.7 9.2 HT1900.1-2455
262.9807 -33.9852 5.7 10.8 -12.9 -0.1199 -2.0 9.0 GX 354-0
312.4905 -32.4160 2.2 39.2 80.7 1.2463 5.2 ------ UNKNOWN
324.1864 -57.3348 2.2 38.4 123.0 0.8038 5.4 ------ UNKNOWN
292.8369 -38.1637 2.0 22.4 75.0 0.4153 5.8 ------ UNKNOWN
264.0920 -20.6490 2.1 24.1 -8.0 0.3307 5.6 ------ UNKNOWN
242.3792 -39.1925 2.4 17.0 -86.7 0.3069 4.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.040000 0.392000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.0587 -60.7384 5.7 53.9 -151.0 -0.0644 -2.0 10.2 Cen X-3
186.4401 -62.9406 394.6 45.9 -149.9 -0.0005 -0.0 11.8 GX 301-2
245.0745 -15.5332 9.2 33.3 -42.9 0.0137 1.3 8.4 Sco X-1
255.8045 -37.8039 4.4 9.3 -52.8 0.0209 2.6 9.0 4U 1700-377
256.2986 -36.2457 0.0 10.3 -45.5 0.0116 1.4 12.5 GX 349+2
263.1363 -24.9131 0.0 19.8 -10.6 -0.0314 -4.0 12.2 GX 1+4
264.8047 -44.4039 7.0 0.6 51.8 0.0125 1.6 3.8 4U 1735-44
268.4608 -1.5929 10.0 43.3 -1.7 0.0155 1.2 10.1 SW J1753.5-0127
270.3081 -24.9398 8.1 20.4 8.3 0.0119 1.4 8.5 GX 5-1
270.4510 -25.8630 13.0 19.6 9.3 0.0071 0.9 10.8 GRS 1758-258
274.1196 -13.9277 4.5 32.0 10.6 -0.0272 -2.5 9.3 GX 17+2
275.9558 -30.2194 6.8 17.3 28.8 0.0139 1.7 9.0 H1820-303
285.1816 -24.8409 11.4 26.2 39.6 -0.0101 -1.0 9.3 HT1900.1-2455
262.9658 -33.9833 7.4 10.8 -12.9 0.0121 1.6 9.0 GX 354-0
287.0265 -38.0345 1.1 18.4 68.6 0.1063 10.9 ------ UNKNOWN
280.7747 8.4765 2.3 55.3 12.1 0.2434 5.0 ------ UNKNOWN
259.7095 -57.6366 2.2 13.2 -177.9 0.0397 5.3 ------ UNKNOWN
255.8581 -54.3251 2.3 11.0 -162.2 0.0418 5.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
56.956590 962.509200
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9805 -15.6280 1.6 43.1 -66.8 19.7329 7.2 0.7 Sco X-1
255.9786 -37.7018 6.1 24.4 -95.3 1.3176 1.9 8.6 4U 1700-377
256.4338 -36.4189 1.8 24.3 -92.1 4.2672 6.4 0.3 GX 349+2
263.1801 -24.7169 8.0 24.2 -60.0 0.9224 1.5 9.5 GX 1+4
264.8478 -44.4743 2.6 17.8 -114.7 2.3634 4.4 4.7 4U 1735-44
268.3392 -1.3826 6.2 40.4 -25.9 1.4099 1.9 4.5 SW J1753.5-0127
270.2880 -25.0944 1.8 19.2 -48.9 3.2052 6.6 0.9 GX 5-1
270.2545 -25.8477 4.5 18.6 -50.6 1.2703 2.6 6.8 GRS 1758-258
274.0334 -13.9871 1.9 26.6 -25.4 3.2555 6.0 3.4 GX 17+2
275.8666 -30.3990 2.7 11.9 -50.1 2.0754 4.2 3.6 H1820-303
284.9828 -24.9839 16.7 13.1 -4.4 0.3841 0.7 4.8 HT1900.1-2455
288.7703 10.9522 4.6 49.0 6.0 3.2450 2.5 1.7 GRS 1915+105
262.9605 -33.8559 1.9 19.8 -81.6 3.2220 6.0 1.9 GX 354-0
331.1911 -24.2418 3.3 39.8 86.6 10.0398 3.5 ------ UNKNOWN
303.1417 11.8093 3.1 52.0 23.9 11.8673 3.7 ------ UNKNOWN
287.9898 18.7815 2.9 56.8 4.8 15.1104 4.0 ------ UNKNOWN
287.8728 0.5837 1.7 38.6 5.1 5.0586 6.8 ------ UNKNOWN
282.1209 -3.2450 2.6 35.0 -4.8 3.0651 4.5 ------ UNKNOWN
277.4181 -23.7721 2.7 16.4 -29.0 2.1243 4.3 ------ UNKNOWN
159.9141 -79.0165 2.6 59.1 -166.1 15.4787 4.4 ------ UNKNOWN
257.4512 9.0606 2.9 54.5 -33.0 10.3103 3.9 ------ UNKNOWN
UNKNOWN
Plot creation:
Sat May 30 21:22:49 EDT 2015