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
220.3589 48.7292 0.0142 46.0938 -13.2474 1.1021629 13.480 TRIG_00231974
Foreground time interval of the image:
-2.348 16.868 (delta_t = 19.216 [sec])
Background time interval of the image:
-168.371 -2.348 (delta_t = 166.023 [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 8.192000
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 8.192000
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 8.192000
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 -2.348 sec. to 16.868 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71732 ( -0.200371 0.203932 )
Norm@50keV : 3.88920E-03 ( -0.000445151 0.000440874 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.53 using 59 PHA bins.
# Reduced chi-squared = 0.9392 for 57 degrees of freedom
# Null hypothesis probability = 6.059017e-01
Photon flux (15-150 keV) in 19.22 sec: 0.519694 ( -0.0600174 0.0603772 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.91199e-07 ( -8.17382e-08 8.23235e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.348 sec. to 16.868 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72408 ( -0.242347 0.200198 )
Epeak [keV] : 9999.36 ( -9999.35 -9999.36 )
Norm@50keV : 3.87767E-03 ( -0.00260439 0.00394793 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.54 using 59 PHA bins.
# Reduced chi-squared = 0.9561 for 56 degrees of freedom
# Null hypothesis probability = 5.684396e-01
Photon flux (15-150 keV) in 19.22 sec: 0.519382 ( -0.059937 0.059666 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.9054e-07 ( -8.0847e-08 8.22328e-08 ) ergs/cm2
Band function
Time interval is from -2.348 sec. to 16.868 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.69363 ( -4.69363 -4.69363 )
beta : -1.78672 ( -0.239713 0.222241 )
Epeak [keV] : 23.2834 ( -23.2834 5.45892 )
Norm@50keV : 447.764 ( -48.7125 3.1142e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.57 using 59 PHA bins.
# Reduced chi-squared = 0.9558 for 55 degrees of freedom
# Null hypothesis probability = 5.679958e-01
Photon flux (15-150 keV) in 19.22 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] : 13.1284 (-2.17282 2.68991)
R^2/D10^2 : 8.64355E-02 (-0.0423911 0.0828546)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 85.10 using 59 PHA bins.
# Reduced chi-squared = 1.493 for 57 degrees of freedom
# Null hypothesis probability = 9.315834e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.072e-08 1.247e-08
25- 50 2.113e-07 3.285e-08
50-150 2.316e-07 5.838e-08
15-150 5.036e-07 7.813e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 149.128 (-60.0788 -147.655)
Norm : 2.10321 (-0.267242 0.380327)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.10 using 59 PHA bins.
# Reduced chi-squared = 0.9667 for 57 degrees of freedom
# Null hypothesis probability = 5.465589e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.039e-07 2.972e-08
25- 50 1.924e-07 7.271e-08
50-150 3.788e-07 2.108e-07
15-150 6.751e-07 3.342e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.82321 (-1.44567 1.67729)
R1^2/D10^2 : 0.756965 (-0.422201 1.13785)
kT2 [keV] : 31.1446 (-8.64353 20.5961)
R2^2/D10^2 : 3.14129E-03 (-0.00243931 0.00661495)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.69 using 59 PHA bins.
# Reduced chi-squared = 0.9216 for 55 degrees of freedom
# Null hypothesis probability = 6.399844e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.148e-07 4.881e-08
25- 50 1.940e-07 7.866e-08
50-150 3.989e-07 2.106e-07
15-150 7.077e-07 2.811e-07
Peak spectrum fit
Power-law model
Time interval is from -1.392 sec. to -0.392 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52957 ( -0.535815 0.524193 )
Norm@50keV : 6.45949E-03 ( -0.0018598 0.00185338 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.51 using 59 PHA bins.
# Reduced chi-squared = 1.114 for 57 degrees of freedom
# Null hypothesis probability = 2.578939e-01
Photon flux (15-150 keV) in 1 sec: 0.812978 ( -0.247042 0.251054 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.09932e-08 ( -1.84273e-08 1.87476e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.392 sec. to -0.392 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47528 ( -2.12662 0.962418 )
Epeak [keV] : 470.357 ( )
Norm@50keV : 6.87296E-03 ( -0.0069543 0.106013 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.50 using 59 PHA bins.
# Reduced chi-squared = 1.134 for 56 degrees of freedom
# Null hypothesis probability = 2.291921e-01
Photon flux (15-150 keV) in 1 sec: 0.807647 ( -0.254064 0.254753 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.03291e-08 ( -2.05061e-08 1.92746e-08 ) ergs/cm2
Band function
Time interval is from -1.392 sec. to -0.392 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.96101 ( -4.96101 -4.96101 )
beta : -1.78821 ( -1.01807 0.647088 )
Epeak [keV] : 29.4692 ( -29.4692 67.2087 )
Norm@50keV : 254.244 ( -71.1384 5.14161e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.13 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 55 degrees of freedom
# Null hypothesis probability = 2.371941e-01
Photon flux (15-150 keV) in 1 sec: 0.795684 ( 6.20432 -0.24058 ) 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] : 13.9569 (-5.3767 10.5544)
R^2/D10^2 : 0.113141 (-0.109981 0.56322)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.48 using 59 PHA bins.
# Reduced chi-squared = 1.184 for 57 degrees of freedom
# Null hypothesis probability = 1.613290e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.657e-09 2.994e-09
25- 50 1.727e-08 1.045e-08
50-150 2.211e-08 1.484e-08
15-150 4.404e-08 2.756e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-199.363 -199.363)
Norm : 3.32174 (-0.948443 1.40481)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.51 using 59 PHA bins.
# Reduced chi-squared = 1.114 for 57 degrees of freedom
# Null hypothesis probability = 2.578678e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.271e-09 5.000e-09
25- 50 1.591e-08 9.500e-09
50-150 3.490e-08 2.077e-08
15-150 5.908e-08 3.510e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.68664 (-2.9777 5.07464)
R1^2/D10^2 : 0.778278 (-0.655672 1.49023)
kT2 [keV] : 38.3132 (-37.6995 -37.6999)
R2^2/D10^2 : 2.84206E-03 (-0.00293699 0.0260886)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.90 using 59 PHA bins.
# Reduced chi-squared = 1.125 for 55 degrees of freedom
# Null hypothesis probability = 2.433975e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.614e-09 5.720e-09
25- 50 1.688e-08 1.019e-08
50-150 3.686e-08 2.223e-08
15-150 6.235e-08 2.985e-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: 1.71732 ( -0.200371 0.203932 )
Norm@50keV : 3.88920E-03 ( -0.000445151 0.000440874 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.53 using 59 PHA bins.
# Reduced chi-squared = 0.9392 for 57 degrees of freedom
# Null hypothesis probability = 6.059017e-01
Photon flux (15-150 keV) in 19.22 sec: 0.519694 ( -0.0600174 0.0603772 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.91199e-07 ( -8.17382e-08 8.23235e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72408 ( -0.242347 0.200198 )
Epeak [keV] : 9999.36 ( -9999.35 -9999.36 )
Norm@50keV : 3.87767E-03 ( -0.00260439 0.00394793 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.54 using 59 PHA bins.
# Reduced chi-squared = 0.9561 for 56 degrees of freedom
# Null hypothesis probability = 5.684396e-01
Photon flux (15-150 keV) in 19.22 sec: 0.519382 ( -0.059937 0.059666 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.9054e-07 ( -8.0847e-08 8.22328e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.69363 ( -4.69363 -4.69363 )
beta : -1.78672 ( -0.239713 0.222241 )
Epeak [keV] : 23.2834 ( -23.2834 5.45892 )
Norm@50keV : 447.764 ( -48.7125 3.1142e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.57 using 59 PHA bins.
# Reduced chi-squared = 0.9558 for 55 degrees of freedom
# Null hypothesis probability = 5.679958e-01
Photon flux (15-150 keV) in 19.22 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) = 1.88e-07
S(50-100 keV) = 2.29e-07
T90 vs. Hardness ratio plot
T90 = 17.6279999911785 sec.
Hardness ratio (energy fluence ratio) = 1.21809
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.25985
Count Ratio (50-100 keV) / (15-25 keV) = 0.893421
Mask shadow pattern
IMX = 1.011283800457363E+00, IMY = 2.380765705595664E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
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:
-168.371410 -2.348000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9780 -15.6428 0.2 29.6 -143.1 9.9860 52.5 0.2 Sco X-1
254.4707 35.3506 97.7 23.0 17.4 0.0180 0.1 0.8 Her X-1
256.0088 -37.8426 1.4 50.2 -163.6 3.2834 8.0 1.1 4U 1700-377
256.3285 -36.4811 9.7 48.9 -164.0 0.4343 1.2 6.2 GX 349+2
263.0421 -24.7693 3.8 38.0 -174.6 0.6654 3.0 2.3 GX 1+4
264.5963 -44.4263 239.8 57.5 -170.6 0.0407 0.0 6.4 4U 1735-44
268.3137 -1.4834 3.3 19.4 152.4 0.5264 3.5 3.7 SW J1753.5-0127
270.2148 -24.9427 5.7 40.3 175.7 0.4739 2.0 9.0 GX 5-1
270.3677 -25.5605 0.0 40.9 175.9 0.3691 1.5 11.5 GRS 1758-258
273.8879 -14.0225 4.7 32.6 161.3 0.5798 2.4 6.9 GX 17+2
275.8272 -30.3279 9.8 47.3 172.7 -0.4289 -1.2 5.6 H1820-303
284.9278 -24.9775 9.4 47.6 159.6 -0.5352 -1.2 6.8 HT1900.1-2455
288.8090 10.9474 1.6 33.5 106.6 2.2435 7.0 0.6 GRS 1915+105
262.9184 -33.8356 4.9 46.9 -171.6 0.6891 2.4 3.5 GX 354-0
203.6785 44.8367 2.4 54.0 -25.1 2.4525 4.9 ------ UNKNOWN
237.1724 -25.6136 2.0 41.6 -138.2 1.5270 5.7 ------ UNKNOWN
209.9666 35.3182 2.4 46.3 -34.7 1.6209 4.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-2.348000 16.868000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9934 -15.7845 11.5 29.7 -143.2 -0.0495 -1.0 8.7 Sco X-1
254.5496 35.2685 11.9 22.9 17.6 0.0456 1.0 6.3 Her X-1
255.9476 -37.7848 5.3 50.2 -163.6 -0.2214 -2.2 4.0 4U 1700-377
256.5231 -36.4780 18.9 48.9 -164.2 -0.0545 -0.6 5.4 GX 349+2
262.8524 -24.7023 3.6 37.9 -174.4 -0.1908 -3.2 8.9 GX 1+4
264.8087 -44.3786 184.6 57.5 -170.8 -0.0138 -0.1 5.1 4U 1735-44
268.3688 -1.4750 5.5 19.4 152.3 0.0970 2.1 1.3 SW J1753.5-0127
270.4100 -25.0594 5.8 40.5 175.5 0.1334 2.0 6.9 GX 5-1
270.3310 -25.7346 5.5 41.1 176.0 -0.1379 -2.1 1.6 GRS 1758-258
274.0084 -13.9798 5.7 32.6 161.1 -0.1192 -2.0 3.4 GX 17+2
275.8438 -30.3670 3.5 47.4 172.7 0.3297 3.3 4.2 H1820-303
285.0736 -25.0663 4.4 47.8 159.5 -0.3114 -2.6 9.0 HT1900.1-2455
288.9322 11.0291 6.9 33.6 106.4 -0.1422 -1.6 9.3 GRS 1915+105
263.0907 -33.9017 3.2 47.0 -171.8 -0.3073 -3.6 6.5 GX 354-0
220.3589 48.7292 0.9 46.1 -13.2 1.1020 13.5 ------ UNKNOWN
251.6240 -28.5932 2.2 41.1 -158.2 0.3272 5.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
116.028590 963.008000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.6781 35.2778 0.0 28.5 156.9 -0.6623 -1.3 11.5 Her X-1
206.9047 24.6730 3.3 26.3 -99.9 1.9752 3.5 ------ UNKNOWN
147.7784 30.8455 4.8 56.3 -28.4 5.9593 2.4 ------ UNKNOWN
214.3744 4.2547 2.7 44.8 -119.9 7.8092 4.2 ------ UNKNOWN
Plot creation:
Sun May 31 11:49:31 EDT 2015