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
244.2564 -47.4387 0.0147 14.6611 -149.8393 0.2937930 13.080 TRIG_00506291
Foreground time interval of the image:
-0.080 4.052 (delta_t = 4.132 [sec])
Background time interval of the image:
-239.512 -0.080 (delta_t = 239.432 [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)
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 -0.080 sec. to 4.052 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67949 ( -0.207159 0.211847 )
Norm@50keV : 4.35258E-03 ( -0.000564382 0.000556388 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.15 using 59 PHA bins.
# Reduced chi-squared = 0.9324 for 57 degrees of freedom
# Null hypothesis probability = 6.203318e-01
Photon flux (15-150 keV) in 4.132 sec: 0.573992 ( -0.0686981 0.0687791 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.66803e-07 ( -2.26188e-08 2.30125e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.080 sec. to 4.052 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08845 ( -1.03044 0.726537 )
Epeak [keV] : 69.3822 ( -20.8231 -69.385 )
Norm@50keV : 9.17900E-03 ( -0.00519522 0.0246503 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.64 using 59 PHA bins.
# Reduced chi-squared = 0.9222 for 56 degrees of freedom
# Null hypothesis probability = 6.404075e-01
Photon flux (15-150 keV) in 4.132 sec: 0.559601 ( -0.0717 0.071427 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.57088e-07 ( -2.60812e-08 2.66303e-08 ) ergs/cm2
Band function
Time interval is from -0.080 sec. to 4.052 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.12921 ( -0.542928 0.761579 )
beta : -9.36913 ( 9.37156 19.3716 )
Epeak [keV] : 72.0110 ( -23.6746 90.5482 )
Norm@50keV : 8.67180E-03 ( -0.00452846 0.00650754 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.65 using 59 PHA bins.
# Reduced chi-squared = 0.9391 for 55 degrees of freedom
# Null hypothesis probability = 6.033950e-01
Photon flux (15-150 keV) in 4.132 sec: 0.560496 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.58202e-07 ( -1.58173e-07 -2.42664e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.8840 (-1.62174 1.98766)
R^2/D10^2 : 0.144912 (-0.06312 0.105233)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.45 using 59 PHA bins.
# Reduced chi-squared = 1.113 for 57 degrees of freedom
# Null hypothesis probability = 2.595489e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.787e-08 3.804e-09
25- 50 5.560e-08 9.111e-09
50-150 4.691e-08 1.290e-08
15-150 1.204e-07 1.897e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 130.940 (-51.4888 -129.673)
Norm : 2.41394 (-0.331102 0.44037)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.74 using 59 PHA bins.
# Reduced chi-squared = 0.9077 for 57 degrees of freedom
# Null hypothesis probability = 6.720721e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.587e-08 4.580e-09
25- 50 4.696e-08 1.394e-08
50-150 8.736e-08 4.991e-08
15-150 1.602e-07 6.427e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.92150 (-2.33832 2.32958)
R1^2/D10^2 : 0.473007 (-0.264817 0.426223)
kT2 [keV] : 28.9349 (-11.3343 61.9107)
R2^2/D10^2 : 3.85365E-03 (-0.00367263 0.0222695)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.10 using 59 PHA bins.
# Reduced chi-squared = 0.9109 for 55 degrees of freedom
# Null hypothesis probability = 6.620438e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.415e-08 1.249e-08
25- 50 5.082e-08 2.535e-08
50-150 8.725e-08 4.763e-08
15-150 1.622e-07 7.268e-08
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 1.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53331 ( -0.216796 0.217612 )
Norm@50keV : 9.11082E-03 ( -0.0012043 0.00119431 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.11 using 59 PHA bins.
# Reduced chi-squared = 1.054 for 57 degrees of freedom
# Null hypothesis probability = 3.639074e-01
Photon flux (15-150 keV) in 1 sec: 1.14788 ( -0.147582 0.147782 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.59807e-08 ( -1.22738e-08 1.24495e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07612 ( -1.36028 0.636618 )
Epeak [keV] : 90.6857 ( -40.9011 -91.3675 )
Norm@50keV : 1.63391E-02 ( -0.00813412 0.0795114 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.53 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 56 degrees of freedom
# Null hypothesis probability = 3.485971e-01
Photon flux (15-150 keV) in 1 sec: 1.12925 ( -0.155199 0.15353 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.18174e-08 ( -1.61781e-08 1.52044e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.87753 ( -1.81324 -0.7039 )
beta : -1.94924 ( -0.667658 0.478584 )
Epeak [keV] : 37.8403 ( -18.9861 40.628 )
Norm@50keV : 1.39342 ( -1.35554 119.543 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.56 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 55 degrees of freedom
# Null hypothesis probability = 4.534841e-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] : 12.1212 (-1.60033 1.99706)
R^2/D10^2 : 0.280442 (-0.120827 0.192406)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.67 using 59 PHA bins.
# Reduced chi-squared = 1.170 for 57 degrees of freedom
# Null hypothesis probability = 1.785642e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.721e-09 1.867e-09
25- 50 2.777e-08 4.560e-09
50-150 2.470e-08 7.020e-09
15-150 6.119e-08 1.118e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 198.482 (-95.9503 -198.381)
Norm : 4.69586 (-0.595377 0.713384)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.49 using 59 PHA bins.
# Reduced chi-squared = 1.044 for 57 degrees of freedom
# Null hypothesis probability = 3.851486e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.170e-08 6.595e-09
25- 50 2.250e-08 1.239e-08
50-150 4.926e-08 2.702e-08
15-150 8.346e-08 4.559e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.94073 (-1.64915 1.41925)
R1^2/D10^2 : 0.509756 (-0.207058 0.504246)
kT2 [keV] : 199.269 (-199.363 -199.363)
R2^2/D10^2 : 1.29962E-04 (-4.7212e-05 0.0023637)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.12 using 59 PHA bins.
# Reduced chi-squared = 0.9112 for 55 degrees of freedom
# Null hypothesis probability = 6.613380e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.040e-08 3.691e-09
25- 50 2.665e-08 8.050e-09
50-150 4.734e-08 1.300e-08
15-150 8.440e-08 1.890e-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: 1.67949 ( -0.207159 0.211847 )
Norm@50keV : 4.35258E-03 ( -0.000564382 0.000556388 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.15 using 59 PHA bins.
# Reduced chi-squared = 0.9324 for 57 degrees of freedom
# Null hypothesis probability = 6.203318e-01
Photon flux (15-150 keV) in 4.132 sec: 0.573992 ( -0.0686981 0.0687791 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.66803e-07 ( -2.26188e-08 2.30125e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08845 ( -1.03044 0.726537 )
Epeak [keV] : 69.3822 ( -20.8231 -69.385 )
Norm@50keV : 9.17900E-03 ( -0.00519522 0.0246503 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.64 using 59 PHA bins.
# Reduced chi-squared = 0.9222 for 56 degrees of freedom
# Null hypothesis probability = 6.404075e-01
Photon flux (15-150 keV) in 4.132 sec: 0.559601 ( -0.0717 0.071424 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.57088e-07 ( -2.60812e-08 2.66303e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.12921 ( -0.542928 0.761579 )
beta : -9.36913 ( 9.37156 19.3716 )
Epeak [keV] : 72.0110 ( -23.6746 90.5323 )
Norm@50keV : 8.67180E-03 ( -0.00452846 0.00650754 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.65 using 59 PHA bins.
# Reduced chi-squared = 0.9391 for 55 degrees of freedom
# Null hypothesis probability = 6.033950e-01
Photon flux (15-150 keV) in 4.132 sec: 0.560496 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.58202e-07 ( -1.58173e-07 -2.42664e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 4.48e-08
S(50-100 keV) = 5.59e-08
T90 vs. Hardness ratio plot
T90 = 3.5799999833107 sec.
Hardness ratio (energy fluence ratio) = 1.24777
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.37267
Count Ratio (50-100 keV) / (15-25 keV) = 0.708263
Mask shadow pattern
IMX = -2.262009851817328E-01, IMY = 1.314445653782226E-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:
-239.512000 -0.080000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.3165 -60.6278 41.0 57.5 -151.2 0.5149 0.3 0.3 Cen X-3
186.4947 -62.7025 4.9 49.6 -152.1 1.2524 2.3 6.0 GX 301-2
244.9695 -15.6451 0.3 23.4 -37.8 7.3533 34.7 0.6 Sco X-1
255.8235 -37.6757 0.0 1.7 -146.3 -0.1589 -0.8 12.7 4U 1700-377
256.4488 -36.3758 5.1 0.6 -98.1 0.4902 2.2 2.9 GX 349+2
263.0734 -24.6094 6.8 12.8 17.9 0.3589 1.7 8.9 GX 1+4
264.8354 -44.6007 5.2 10.0 140.6 0.4382 2.2 9.9 4U 1735-44
268.3472 -1.4600 4.0 36.4 12.2 0.8164 2.9 1.3 SW J1753.5-0127
270.2871 -25.0805 1.8 15.9 41.6 1.4030 6.5 0.2 GX 5-1
270.2589 -25.8862 3.6 15.3 43.6 0.6576 3.2 8.9 GRS 1758-258
273.9961 -14.0953 4.7 26.8 31.5 0.5944 2.4 3.6 GX 17+2
275.9578 -30.2209 3.6 16.8 67.2 0.6947 3.2 8.9 H1820-303
285.1159 -24.8579 15.7 26.5 65.3 0.2131 0.7 5.7 HT1900.1-2455
263.0020 -33.8054 2.4 5.4 56.4 1.0466 4.8 1.9 GX 354-0
293.3534 -21.1135 3.1 34.9 67.3 1.8354 3.7 ------ UNKNOWN
279.8787 5.5175 2.3 46.9 24.9 2.8593 5.1 ------ UNKNOWN
344.9495 -80.0295 3.8 53.9 160.9 3.8322 3.0 ------ UNKNOWN
155.5851 -72.0313 3.4 59.1 -166.1 4.4149 3.4 ------ UNKNOWN
204.7790 -33.6885 2.8 42.5 -109.2 4.2086 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.080000 4.052000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.1717 -60.6097 5.4 57.5 -151.2 -0.3290 -2.1 4.3 Cen X-3
186.4948 -62.8511 8.3 49.6 -152.3 -0.0765 -1.4 6.6 GX 301-2
245.1325 -15.6394 32.6 23.4 -37.4 -0.0086 -0.4 8.8 Sco X-1
255.9220 -37.6861 6.7 1.7 -148.5 -0.0379 -1.7 10.0 4U 1700-377
256.3082 -36.4041 7.1 0.8 -100.1 0.0357 1.6 6.2 GX 349+2
262.8547 -24.6340 8.4 12.7 17.1 -0.0293 -1.4 10.8 GX 1+4
264.9473 -44.5260 5.5 10.0 140.0 -0.0432 -2.1 9.9 4U 1735-44
268.2460 -1.4052 24.8 36.4 12.0 0.0151 0.5 7.8 SW J1753.5-0127
270.2833 -25.0752 31.9 15.9 41.6 -0.0085 -0.4 0.2 GX 5-1
270.1728 -25.8877 728.8 15.2 43.3 -0.0004 -0.0 11.2 GRS 1758-258
274.0050 -14.0365 42.6 26.9 31.4 0.0076 0.3 0.0 GX 17+2
275.9253 -30.3891 280.5 16.7 67.6 -0.0010 -0.0 1.3 H1820-303
285.1057 -24.9979 4.9 26.4 65.6 -0.0773 -2.4 6.0 HT1900.1-2455
263.0080 -33.7301 28.1 5.4 55.7 0.0086 0.4 6.3 GX 354-0
298.6803 -19.1733 2.4 40.1 69.3 0.4025 4.8 ------ UNKNOWN
244.2564 -47.4386 0.9 14.7 -149.8 0.2937 13.1 ------ UNKNOWN
197.6267 -48.0425 2.1 44.5 -131.4 0.3280 5.4 ------ UNKNOWN
230.0260 6.4746 2.3 49.9 -43.2 0.4762 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
491.888600 962.508000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9778 -15.6398 1.3 43.1 -61.6 12.4216 8.9 0.1 Sco X-1
255.9705 -37.7028 17.9 24.4 -90.1 -0.2657 -0.6 8.5 4U 1700-377
256.4551 -36.4094 10.9 24.3 -86.8 0.4373 1.1 1.3 GX 349+2
263.0195 -24.7705 3.2 24.3 -55.0 1.2982 3.6 1.6 GX 1+4
264.8159 -44.6008 5.0 17.8 -109.8 0.8247 2.3 9.6 4U 1735-44
268.3508 -1.4218 3.6 40.4 -20.7 1.4655 3.2 2.1 SW J1753.5-0127
270.2965 -25.0738 1.1 19.2 -43.5 3.0831 10.1 0.7 GX 5-1
270.2789 -25.7628 4.3 18.7 -45.1 0.8325 2.7 1.7 GRS 1758-258
274.0687 -13.8945 3.2 26.7 -20.0 1.2555 3.7 9.3 GX 17+2
275.8583 -30.3673 2.6 12.0 -44.7 1.3747 4.5 3.5 H1820-303
285.1368 -24.9411 12.6 13.2 1.4 0.2817 0.9 5.6 HT1900.1-2455
288.7649 10.9532 3.2 49.0 11.2 3.0355 3.7 2.0 GRS 1915+105
263.0963 -33.8320 2.2 19.7 -76.2 1.9379 5.2 5.3 GX 354-0
307.0439 -12.9702 3.4 30.7 49.7 1.8548 3.4 ------ UNKNOWN
293.7557 15.1872 3.3 53.6 17.0 6.7483 3.5 ------ UNKNOWN
301.6046 -13.9386 2.7 27.3 41.1 1.7797 4.3 ------ UNKNOWN
34.4964 -77.0521 2.5 56.8 174.1 11.0852 4.7 ------ UNKNOWN
138.6310 -81.8189 3.1 59.1 -166.1 8.8081 3.7 ------ UNKNOWN
165.9418 -78.0741 3.8 58.8 -159.2 7.3308 3.0 ------ UNKNOWN
243.4066 -16.5896 2.5 43.7 -64.1 6.4880 4.6 ------ UNKNOWN
Plot creation:
Sat May 30 21:16:35 EDT 2015