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
271.8991 -2.2930 0.0111 40.1546 -153.9266 0.5628781 17.384 TRIG_00536897
Foreground time interval of the image:
-0.808 2.476 (delta_t = 3.284 [sec])
Background time interval of the image:
-99.827 -0.808 (delta_t = 99.019 [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 0.512000
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 0.512000
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 0.512000
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 -0.808 sec. to 2.476 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70715 ( -0.159634 0.162475 )
Norm@50keV : 1.10263E-02 ( -0.00108994 0.00107981 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.78 using 59 PHA bins.
# Reduced chi-squared = 0.8733 for 57 degrees of freedom
# Null hypothesis probability = 7.402527e-01
Photon flux (15-150 keV) in 3.284 sec: 1.46808 ( -0.13995 0.140171 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.3508e-07 ( -3.43966e-08 3.46547e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.808 sec. to 2.476 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39997 ( -0.728673 0.441231 )
Epeak [keV] : 91.9202 ( )
Norm@50keV : 1.60993E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.11 using 59 PHA bins.
# Reduced chi-squared = 0.8769 for 56 degrees of freedom
# Null hypothesis probability = 7.312288e-01
Photon flux (15-150 keV) in 3.284 sec: 1.45156 ( -0.14376 0.14407 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.27208e-07 ( -3.86987e-08 3.82911e-08 ) ergs/cm2
Band function
Time interval is from -0.808 sec. to 2.476 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.81231E-02 ( -2.45814 0.179734 )
beta : -1.92019 ( 1.91361 0.260991 )
Epeak [keV] : 39.0659 ( -17.2814 117.769 )
Norm@50keV : 0.142070 ( -0.146965 513.773 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.80 using 59 PHA bins.
# Reduced chi-squared = 0.8509 for 55 degrees of freedom
# Null hypothesis probability = 7.763502e-01
Photon flux (15-150 keV) in 3.284 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.25062e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.2292 (-1.36367 1.579)
R^2/D10^2 : 0.333711 (-0.121389 0.184979)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.91 using 59 PHA bins.
# Reduced chi-squared = 1.314 for 57 degrees of freedom
# Null hypothesis probability = 5.599153e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.471e-08 6.269e-09
25- 50 1.117e-07 1.222e-08
50-150 1.017e-07 1.988e-08
15-150 2.481e-07 2.849e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 134.635 (-44.436 -131.72)
Norm : 6.08683 (-0.679312 0.894785)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.16 using 59 PHA bins.
# Reduced chi-squared = 0.8625 for 57 degrees of freedom
# Null hypothesis probability = 7.602840e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.175e-08 6.995e-09
25- 50 9.437e-08 1.650e-08
50-150 1.778e-07 7.773e-08
15-150 3.239e-07 1.042e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.30297 (-1.6852 1.75337)
R1^2/D10^2 : 1.09696 (-0.512677 1.17438)
kT2 [keV] : 36.6481 (-14.0113 101.872)
R2^2/D10^2 : 4.54220E-03 (-0.00427631 0.0198834)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.04 using 59 PHA bins.
# Reduced chi-squared = 0.8371 for 55 degrees of freedom
# Null hypothesis probability = 7.998496e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.885e-08 1.308e-08
25- 50 1.042e-07 2.956e-08
50-150 1.814e-07 8.798e-08
15-150 3.344e-07 1.114e-07
Peak spectrum fit
Power-law model
Time interval is from -0.044 sec. to 0.956 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.90195 ( -0.22144 0.231987 )
Norm@50keV : 1.37613E-02 ( -0.00208173 0.00203684 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.01 using 59 PHA bins.
# Reduced chi-squared = 1.316 for 57 degrees of freedom
# Null hypothesis probability = 5.514766e-02
Photon flux (15-150 keV) in 1 sec: 1.97653 ( -0.260122 0.260354 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26519e-07 ( -1.86305e-08 1.88941e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.044 sec. to 0.956 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09095 ( -2.11455 1.06906 )
Epeak [keV] : 46.1546 ( -38.5544 -46.0612 )
Norm@50keV : 4.11052E-02 ( -0.0417693 0.753575 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.93 using 59 PHA bins.
# Reduced chi-squared = 1.320 for 56 degrees of freedom
# Null hypothesis probability = 5.454721e-02
Photon flux (15-150 keV) in 1 sec: 1.92964 ( -0.27961 0.27305 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16447e-07 ( -2.45064e-08 2.4784e-08 ) ergs/cm2
Band function
Time interval is from -0.044 sec. to 0.956 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.05953 ( -2.02742 -0.508191 )
beta : -2.50129 ( -0.987835 0.531607 )
Epeak [keV] : 35.6373 ( -10.4195 12.7598 )
Norm@50keV : 1.02761 ( -1.03151 269.552 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.92 using 59 PHA bins.
# Reduced chi-squared = 1.271 for 55 degrees of freedom
# Null hypothesis probability = 8.480297e-02
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17813e-07 ( -1.17806e-07 -2.03274e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.92575 (-1.24191 1.4558)
R^2/D10^2 : 0.991457 (-0.410103 0.668992)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.95 using 59 PHA bins.
# Reduced chi-squared = 1.368 for 57 degrees of freedom
# Null hypothesis probability = 3.408854e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.984e-08 4.440e-09
25- 50 4.881e-08 7.995e-09
50-150 2.493e-08 8.140e-09
15-150 9.359e-08 1.746e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 75.8043 (-25.2337 49.8259)
Norm : 9.54091 (-1.79472 2.21821)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.89 using 59 PHA bins.
# Reduced chi-squared = 1.296 for 57 degrees of freedom
# Null hypothesis probability = 6.558865e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.466e-08 4.500e-09
25- 50 4.006e-08 5.820e-09
50-150 5.450e-08 2.499e-08
15-150 1.192e-07 2.509e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.77331 (-1.09147 1.50242)
R1^2/D10^2 : 1.47540 (-0.665553 1.0657)
kT2 [keV] : 200.000 ( )
R2^2/D10^2 : 1.62288E-04 (-6.61894e-05 6.64843e-05)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.50 using 59 PHA bins.
#Fit statistic : Chi-Squared = 64.00 using 59 PHA bins.
# Reduced chi-squared = 1.173 for 55 degrees of freedom
# Reduced chi-squared = 1.164 for 55 degrees of freedom
# Null hypothesis probability = 1.784279e-01
# Null hypothesis probability = 1.900157e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.219e-08 6.575e-09
25- 50 4.600e-08 1.223e-08
50-150 5.992e-08 3.885e-08
15-150 1.281e-07 5.052e-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: 1.70715 ( -0.159634 0.162475 )
Norm@50keV : 1.10263E-02 ( -0.00108994 0.00107981 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.78 using 59 PHA bins.
# Reduced chi-squared = 0.8733 for 57 degrees of freedom
# Null hypothesis probability = 7.402527e-01
Photon flux (15-150 keV) in 3.284 sec: 1.46808 ( -0.13995 0.140171 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.3508e-07 ( -3.43966e-08 3.46547e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39997 ( -0.728673 0.441231 )
Epeak [keV] : 91.9202 ( )
Norm@50keV : 1.60993E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.11 using 59 PHA bins.
# Reduced chi-squared = 0.8769 for 56 degrees of freedom
# Null hypothesis probability = 7.312288e-01
Photon flux (15-150 keV) in 3.284 sec: 1.45156 ( -0.14376 0.14407 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.27208e-07 ( -3.86987e-08 3.82911e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.81231E-02 ( -2.45683 0.179734 )
beta : -1.92019 ( 1.91361 0.260991 )
Epeak [keV] : 39.0659 ( -17.2659 117.769 )
Norm@50keV : 0.142070 ( -0.146965 513.749 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.80 using 59 PHA bins.
# Reduced chi-squared = 0.8509 for 55 degrees of freedom
# Null hypothesis probability = 7.763502e-01
Photon flux (15-150 keV) in 3.284 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.25062e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 9.10e-08
S(50-100 keV) = 1.11e-07
T90 vs. Hardness ratio plot
T90 = 2.87599992752075 sec.
Hardness ratio (energy fluence ratio) = 1.21978
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.62442
Count Ratio (50-100 keV) / (15-25 keV) = 0.915141
Mask shadow pattern
IMX = -7.578466293539096E-01, IMY = 3.708290613622198E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
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:
-99.827400 -0.808000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5152 35.3851 1.0 1.1 -8.6 1.2218 11.8 3.8 Her X-1
268.3569 -1.5840 7.1 38.3 -149.0 0.2584 1.6 7.9 SW J1753.5-0127
273.9184 -14.1138 6.9 52.0 -150.9 -0.5801 -1.6 6.9 GX 17+2
288.7535 10.9076 1.7 38.4 172.2 1.0941 6.6 3.5 GRS 1915+105
299.5906 35.1828 2.1 35.7 128.2 1.2625 5.5 1.1 Cyg X-1
308.1079 40.9351 3.8 41.2 117.1 1.3221 3.1 1.1 Cyg X-3
178.4475 61.8549 3.1 53.9 17.0 2.1046 3.8 ------ UNKNOWN
288.5475 4.4518 2.3 43.0 179.2 0.9160 5.0 ------ UNKNOWN
245.7988 9.4733 2.4 26.9 -106.4 0.6764 4.8 ------ UNKNOWN
185.8618 27.5875 3.2 58.9 -24.4 2.6571 3.7 ------ UNKNOWN
270.3775 -18.6286 2.6 55.3 -145.3 3.2926 4.5 ------ UNKNOWN
237.3859 -2.5992 2.8 41.2 -99.9 2.2547 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.808000 2.476000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.6354 35.2851 4.8 0.9 -11.0 -0.0459 -2.4 9.4 Her X-1
268.1630 -1.4566 24.5 38.2 -148.8 -0.0143 -0.5 12.3 SW J1753.5-0127
273.9501 -13.9967 3.5 51.9 -151.0 -0.2131 -3.3 4.0 GX 17+2
288.7346 11.0272 35.9 38.4 172.1 0.0101 0.3 6.2 GRS 1915+105
299.7529 35.2458 3.3 35.8 128.1 -0.1456 -3.5 8.4 Cyg X-1
307.9207 40.9378 7.2 41.1 117.2 0.1185 1.6 8.6 Cyg X-3
206.4969 69.1026 2.4 43.5 28.7 0.2128 4.8 ------ UNKNOWN
271.8991 -2.2930 0.7 40.2 -153.9 0.5627 17.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
113.572580 962.327800
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9742 -15.6466 0.4 29.7 -104.1 25.3189 29.3 0.5 Sco X-1
254.4527 35.3523 1.0 41.0 -7.7 9.3573 11.0 0.6 Her X-1
255.9711 -37.8320 37.3 38.5 -145.3 0.2535 0.3 1.0 4U 1700-377
256.4465 -36.3613 3.0 37.0 -144.8 2.9463 3.8 3.7 GX 349+2
263.0192 -24.7053 2.9 24.0 -145.5 2.2277 3.9 2.5 GX 1+4
264.8300 -44.4338 5.1 42.6 -158.2 2.2985 2.3 3.9 4U 1735-44
268.3489 -1.4465 2.2 3.7 -63.0 3.2558 5.2 1.2 SW J1753.5-0127
270.2776 -25.1298 1.8 22.9 -161.9 3.9697 6.3 3.1 GX 5-1
270.1990 -25.7723 9.3 23.6 -161.8 0.7875 1.2 5.9 GRS 1758-258
274.0747 -13.9295 3.3 11.9 -175.9 2.0446 3.5 7.6 GX 17+2
275.8682 -30.4609 2.7 28.4 -172.9 2.7622 4.3 6.4 H1820-303
284.8506 -24.8199 11.6 25.8 166.5 0.6001 1.0 11.8 HT1900.1-2455
288.7868 10.8918 1.7 21.3 65.8 4.4339 6.6 3.3 GRS 1915+105
299.5802 35.1898 2.3 45.5 46.4 12.7120 5.0 0.9 Cyg X-1
263.1923 -33.9589 23.5 32.7 -152.2 0.3506 0.5 12.6 GX 354-0
313.1628 -26.1280 3.8 46.2 139.2 8.7149 3.0 ------ UNKNOWN
277.3691 -23.7345 2.1 22.1 -179.0 3.2950 5.5 ------ UNKNOWN
288.1309 -51.6493 2.7 51.2 -178.6 6.1460 4.3 ------ UNKNOWN
266.3112 -26.3925 0.8 24.7 -153.6 9.4451 14.4 ------ UNKNOWN
252.1975 16.7560 2.5 27.2 -30.7 2.6390 4.5 ------ UNKNOWN
250.9484 -44.5767 3.6 46.2 -145.0 4.1106 3.3 ------ UNKNOWN
UNKNOWN
UNKNOWN
UNKNOWN
Plot creation:
Sat May 30 18:01:38 EDT 2015