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
284.9826 -25.2778 0.0205 24.6667 -92.9612 0.2295110 9.369 TRIG_00345945
Foreground time interval of the image:
-0.824 2.176 (delta_t = 3.000 [sec])
Background time interval of the image:
-530.623 -493.713 (delta_t = 36.910 [sec])
-239.824 -0.824 (delta_t = 239.000 [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 1.024000
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 1.024000
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 1.024000
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 -0.824 sec. to 2.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30577 ( -0.337747 0.328298 )
Norm@50keV : 4.61142E-03 ( -0.000808615 0.000807891 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.36 using 59 PHA bins.
# Reduced chi-squared = 0.7256 for 57 degrees of freedom
# Null hypothesis probability = 9.408054e-01
Photon flux (15-150 keV) in 3 sec: 0.550742 ( -0.100741 0.101308 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36516e-07 ( -2.63687e-08 2.6774e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.824 sec. to 2.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.46824 ( )
Epeak [keV] : 153.904 ( )
Norm@50keV : 1.02682E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.04 using 59 PHA bins.
# Reduced chi-squared = 0.7328 for 56 degrees of freedom
# Null hypothesis probability = 9.331370e-01
Photon flux (15-150 keV) in 3 sec: 0.550889 ( -0.100785 0.099862 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36136e-07 ( -2.72343e-08 2.6805e-08 ) ergs/cm2
Band function
Time interval is from -0.824 sec. to 2.176 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.970257 ( 0.978971 0.978971 )
beta : -1.35281 ( 1.34839 0.380762 )
Epeak [keV] : 116.682 ( -118.485 -118.485 )
Norm@50keV : 7.27058E-03 ( -0.00313102 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.36 using 59 PHA bins.
# Reduced chi-squared = 0.7521 for 55 degrees of freedom
# Null hypothesis probability = 9.133265e-01
Photon flux (15-150 keV) in 3 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] : 16.6006 (-3.63854 5.39045)
R^2/D10^2 : 4.42598E-02 (-0.027037 0.0599303)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.57 using 59 PHA bins.
# Reduced chi-squared = 0.8696 for 57 degrees of freedom
# Null hypothesis probability = 7.471850e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.499e-09 2.902e-09
25- 50 3.255e-08 1.134e-08
50-150 6.354e-08 2.457e-08
15-150 1.036e-07 2.880e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 2.28962 (-0.405604 0.405557)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.31 using 59 PHA bins.
# Reduced chi-squared = 0.7598 for 57 degrees of freedom
# Null hypothesis probability = 9.096647e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.711e-08 9.990e-09
25- 50 3.290e-08 1.847e-08
50-150 7.216e-08 4.118e-08
15-150 1.222e-07 6.999e-08
Double BB
R1^2/D10^2 : 0.145064 ( )
kT2 [keV] : 200.000 ( )
R2^2/D10^2 : 8.69046E-05 (-4.34668e-05 0.000486525)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.73 using 59 PHA bins.
#Fit statistic : Chi-Squared = 40.61 using 59 PHA bins.
#Fit statistic : Chi-Squared = 40.52 using 59 PHA bins.
# Reduced chi-squared = 0.7406 for 55 degrees of freedom
# Reduced chi-squared = 0.7384 for 55 degrees of freedom
# Reduced chi-squared = 0.7367 for 55 degrees of freedom
# Null hypothesis probability = 9.243360e-01
# Null hypothesis probability = 9.263168e-01
# Null hypothesis probability = 9.278372e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.209e-08 7.062e-09
25- 50 3.425e-08 1.943e-08
50-150 9.342e-08 4.649e-08
15-150 1.398e-07 6.682e-08
Peak spectrum fit
Power-law model
Time interval is from 0.176 sec. to 1.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43346 ( -0.35699 0.355693 )
Norm@50keV : 7.27682E-03 ( -0.00145737 0.00145068 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.64 using 59 PHA bins.
# Reduced chi-squared = 1.257 for 57 degrees of freedom
# Null hypothesis probability = 9.173337e-02
Photon flux (15-150 keV) in 1 sec: 0.893149 ( -0.182327 0.183359 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.98499e-08 ( -1.5182e-08 1.54721e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.176 sec. to 1.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.202137 ( -4.42854 1.54521 )
Epeak [keV] : 71.1208 ( -22.692 -70.6859 )
Norm@50keV : 3.05828E-02 ( -0.0316388 4.53807 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.91 using 59 PHA bins.
# Reduced chi-squared = 1.266 for 56 degrees of freedom
# Null hypothesis probability = 8.660177e-02
Photon flux (15-150 keV) in 1 sec: 0.833706 ( -0.23513 0.216344 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.22217e-08 ( -1.96252e-08 2.07594e-08 ) ergs/cm2
Band function
Time interval is from 0.176 sec. to 1.176 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.01136 ( -0.969837 3.90267 )
beta : -2.39442 ( 2.37668 1.16722 )
Epeak [keV] : 57.1662 ( -57.735 135.618 )
Norm@50keV : 0.130620 ( -0.110817 18.0433 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.04 using 59 PHA bins.
# Reduced chi-squared = 1.273 for 55 degrees of freedom
# Null hypothesis probability = 8.328432e-02
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.31589e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.6587 (-2.66182 3.64222)
R^2/D10^2 : 0.113445 (-0.062399 0.119711)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.45 using 59 PHA bins.
# Reduced chi-squared = 1.253 for 57 degrees of freedom
# Null hypothesis probability = 9.435378e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.121e-09 1.988e-09
25- 50 1.992e-08 6.474e-09
50-150 2.882e-08 1.248e-08
15-150 5.386e-08 1.684e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-103.18 -199.363)
Norm : 3.69000 (-0.728552 0.728617)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.62 using 59 PHA bins.
# Reduced chi-squared = 1.257 for 57 degrees of freedom
# Null hypothesis probability = 9.201708e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.188e-09 5.370e-09
25- 50 1.768e-08 1.006e-08
50-150 3.876e-08 2.236e-08
15-150 6.563e-08 3.751e-08
Double BB
R1^2/D10^2 : 1.04341E+06 ( )
kT2 [keV] : 15.4650 (-2.91376 4.08126)
R2^2/D10^2 : 9.11976E-02 (-0.0518996 0.0564698)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.45 using 59 PHA bins.
#Fit statistic : Chi-Squared = 64.43 using 59 PHA bins.
#Fit statistic : Chi-Squared = 64.21 using 59 PHA bins.
# Reduced chi-squared = 1.299 for 55 degrees of freedom
# Reduced chi-squared = 1.171 for 55 degrees of freedom
# Reduced chi-squared = 1.167 for 55 degrees of freedom
# Null hypothesis probability = 6.724499e-02
# Null hypothesis probability = 1.800401e-01
# Null hypothesis probability = 1.851305e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
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: 1.30577 ( -0.337747 0.328298 )
Norm@50keV : 4.61142E-03 ( -0.000808615 0.000807891 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.36 using 59 PHA bins.
# Reduced chi-squared = 0.7256 for 57 degrees of freedom
# Null hypothesis probability = 9.408054e-01
Photon flux (15-150 keV) in 3 sec: 0.550742 ( -0.100741 0.101308 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36516e-07 ( -2.63687e-08 2.6774e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.46824 ( )
Epeak [keV] : 153.904 ( )
Norm@50keV : 1.02682E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.04 using 59 PHA bins.
# Reduced chi-squared = 0.7328 for 56 degrees of freedom
# Null hypothesis probability = 9.331370e-01
Photon flux (15-150 keV) in 3 sec: 0.550889 ( -0.100785 0.099862 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36136e-07 ( -2.72343e-08 2.6805e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.970257 ( 0.978971 0.978971 )
beta : -1.35281 ( 1.34839 0.380762 )
Epeak [keV] : 116.682 ( -118.485 -118.485 )
Norm@50keV : 7.27058E-03 ( -0.00313102 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.36 using 59 PHA bins.
# Reduced chi-squared = 0.7521 for 55 degrees of freedom
# Null hypothesis probability = 9.133265e-01
Photon flux (15-150 keV) in 3 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) = 3.05e-08
S(50-100 keV) = 4.93e-08
T90 vs. Hardness ratio plot
T90 = 3 sec.
Hardness ratio (energy fluence ratio) = 1.61639
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.91808
Count Ratio (50-100 keV) / (15-25 keV) = 1.47483
Mask shadow pattern
IMX = -2.372420022187639E-02, IMY = 4.586306671253991E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
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:
-530.623390 -493.713500
-239.824000 -0.824000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9847 -15.6414 0.3 16.4 127.8 10.5688 45.9 0.3 Sco X-1
256.0356 -37.8392 1.7 10.7 1.7 1.5435 7.0 2.3 4U 1700-377
256.6187 -36.4360 4.4 9.2 -0.2 0.6013 2.6 8.9 GX 349+2
262.8669 -24.7116 7.8 5.4 -121.3 0.3467 1.5 8.0 GX 1+4
264.7332 -44.4607 13.9 18.2 -21.4 0.1968 0.8 0.8 4U 1735-44
268.4149 -1.4529 3.5 27.8 -160.7 0.7678 3.3 2.8 SW J1753.5-0127
270.2604 -25.1417 4.5 11.6 -102.2 0.5950 2.6 4.0 GX 5-1
270.2828 -25.7019 3.7 11.5 -99.5 0.8299 3.6 2.7 GRS 1758-258
273.9654 -14.0647 1.8 20.2 -132.0 1.5950 6.4 2.9 GX 17+2
275.9790 -30.2807 5.6 16.5 -79.7 0.4881 2.1 5.9 H1820-303
284.8512 -24.8043 0.0 24.6 -94.1 -0.2220 -0.7 12.2 HT1900.1-2455
288.8195 10.9040 2.8 48.8 -141.9 2.7832 4.2 2.8 GRS 1915+105
263.1547 -33.8252 11.5 8.2 -39.7 0.2233 1.0 8.3 GX 354-0
255.6566 -48.8179 1.8 21.6 -1.3 1.5191 6.5 ------ UNKNOWN
266.3549 30.4418 2.4 58.3 -175.7 6.6839 4.8 ------ UNKNOWN
277.4108 -23.7352 2.2 18.3 -101.3 1.2967 5.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.824000 2.176000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.8734 -15.7143 5.8 16.5 127.3 0.0400 2.0 7.6 Sco X-1
256.1556 -37.9997 4.1 10.8 1.1 -0.0505 -2.8 12.3 4U 1700-377
256.3611 -36.5585 10.7 9.4 1.1 -0.0194 -1.1 8.9 GX 349+2
262.9529 -24.8325 11.0 5.5 -119.8 -0.0189 -1.0 6.0 GX 1+4
264.6350 -44.3018 8.5 18.0 -21.3 -0.0238 -1.3 10.0 4U 1735-44
268.5041 -1.6106 0.0 27.7 -160.4 0.0054 0.3 12.5 SW J1753.5-0127
270.3539 -25.2253 3.9 11.7 -101.7 -0.0553 -2.9 9.6 GX 5-1
270.1382 -25.8388 22.4 11.4 -98.9 0.0098 0.5 10.6 GRS 1758-258
274.0059 -14.0360 170.0 20.3 -132.0 0.0013 0.1 0.0 GX 17+2
275.7987 -30.5206 15.2 16.3 -78.8 0.0148 0.8 11.3 H1820-303
285.1790 -24.7667 0.0 24.9 -94.1 -0.0316 -1.3 12.1 HT1900.1-2455
288.9034 10.8639 6.6 48.8 -141.8 0.0960 1.8 7.9 GRS 1915+105
263.1750 -33.6894 0.0 8.1 -40.4 -0.0403 -2.3 12.7 GX 354-0
317.8854 -81.6741 2.5 58.9 -13.1 0.5543 4.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
63.676600 855.476590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9961 -15.6376 1.0 38.5 103.8 8.4799 11.1 1.0 Sco X-1
255.9739 -37.7963 1.6 27.5 63.1 2.1752 7.4 2.9 4U 1700-377
256.4314 -36.3566 4.0 26.8 65.9 0.8298 2.9 4.0 GX 349+2
263.0514 -24.6404 4.9 19.9 94.4 0.5775 2.4 6.7 GX 1+4
264.9433 -44.4286 4.6 25.1 42.4 0.5635 2.5 8.7 4U 1735-44
268.4129 -1.4515 2.3 28.7 150.8 1.2861 5.0 2.7 SW J1753.5-0127
270.2736 -25.1351 4.5 13.3 94.7 0.4792 2.6 3.4 GX 5-1
270.4700 -25.8005 5.0 13.1 91.8 -0.4317 -2.3 9.7 GRS 1758-258
274.0138 -14.0329 1.6 15.2 142.7 1.5498 7.1 0.5 GX 17+2
275.9489 -30.2438 4.5 9.4 63.3 0.5087 2.5 7.5 H1820-303
285.1010 -24.9764 3.4 0.3 -150.4 0.6731 3.4 4.9 HT1900.1-2455
288.8049 10.9246 0.9 36.4 -166.4 3.1046 12.3 1.3 GRS 1915+105
262.9782 -33.8453 178.5 20.9 67.9 -0.0159 -0.1 0.8 GX 354-0
293.0685 -46.5519 4.1 22.2 -7.6 0.6007 2.8 ------ UNKNOWN
296.2178 -11.7049 2.8 17.2 -132.6 0.8840 4.1 ------ UNKNOWN
304.2121 17.5524 3.3 46.8 -147.2 1.5061 3.5 ------ UNKNOWN
340.6517 -40.5120 3.0 48.3 -50.0 5.2826 3.8 ------ UNKNOWN
314.3968 16.8845 4.0 51.0 -135.5 3.6403 2.9 ------ UNKNOWN
Plot creation:
Sun May 31 04:42:26 EDT 2015