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
260.8751 -15.7998 0.0153 35.6026 62.8952 1.2229148 12.643 TRIG_00448229
Foreground time interval of the image:
-0.936 12.064 (delta_t = 13.000 [sec])
Background time interval of the image:
-151.835 -0.936 (delta_t = 150.899 [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 4.096000
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 4.096000
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 4.096000
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 -0.936 sec. to 12.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58938 ( -0.192205 0.195119 )
Norm@50keV : 6.55026E-03 ( -0.000748981 0.000742182 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.76 using 59 PHA bins.
# Reduced chi-squared = 1.136 for 57 degrees of freedom
# Null hypothesis probability = 2.242971e-01
Photon flux (15-150 keV) in 13 sec: 0.838991 ( -0.0933977 0.0935639 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.97415e-07 ( -9.76151e-08 9.87034e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.936 sec. to 12.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30141 ( -0.761347 0.376133 )
Epeak [keV] : 120.284 ( -120.288 -120.288 )
Norm@50keV : 9.18919E-03 ( -0.00329784 0.0126015 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.22 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 56 degrees of freedom
# Null hypothesis probability = 2.106426e-01
Photon flux (15-150 keV) in 13 sec: 0.828012 ( -0.096869 0.096773 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.80894e-07 ( -1.05294e-07 1.05907e-07 ) ergs/cm2
Band function
Time interval is from -0.936 sec. to 12.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.26518 ( -0.398198 0.72331 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 114.352 ( -50.5288 -114.315 )
Norm@50keV : 9.55197E-03 ( -0.00363702 0.00599919 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.23 using 59 PHA bins.
# Reduced chi-squared = 1.168 for 55 degrees of freedom
# Null hypothesis probability = 1.845812e-01
Photon flux (15-150 keV) in 13 sec: 0.826837 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.78791e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.0255 (-2.18718 2.52561)
R^2/D10^2 : 9.12663E-02 (-0.0384113 0.0682818)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.35 using 59 PHA bins.
# Reduced chi-squared = 1.532 for 57 degrees of freedom
# Null hypothesis probability = 5.985613e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.607e-08 1.188e-08
25- 50 2.231e-07 3.549e-08
50-150 3.431e-07 8.125e-08
15-150 6.222e-07 9.262e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 183.433 (-75.8917 -183.378)
Norm : 3.41946 (-0.386205 0.456301)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.26 using 59 PHA bins.
# Reduced chi-squared = 1.127 for 57 degrees of freedom
# Null hypothesis probability = 2.373522e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.119e-07 6.221e-08
25- 50 2.130e-07 1.132e-07
50-150 4.541e-07 2.452e-07
15-150 7.789e-07 4.146e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.74372 (-1.43226 1.80006)
R1^2/D10^2 : 1.87017 (-1.19309 4.05659)
kT2 [keV] : 23.4788 (-4.72302 7.88929)
R2^2/D10^2 : 1.57324E-02 (-0.0100502 0.0118039)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.08 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 55 degrees of freedom
# Null hypothesis probability = 2.667113e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.200e-07 6.137e-08
25- 50 2.014e-07 7.502e-08
50-150 4.635e-07 2.502e-07
15-150 7.850e-07 3.177e-07
Peak spectrum fit
Power-law model
Time interval is from 6.064 sec. to 7.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70375 ( -0.442972 0.48233 )
Norm@50keV : 9.37719E-03 ( -0.00277693 0.00267588 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.56 using 59 PHA bins.
# Reduced chi-squared = 0.9923 for 57 degrees of freedom
# Null hypothesis probability = 4.915585e-01
Photon flux (15-150 keV) in 1 sec: 1.24705 ( -0.329583 0.33 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.67959e-08 ( -2.59838e-08 2.68191e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.064 sec. to 7.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04019 ( -2.17062 1.54181 )
Epeak [keV] : 69.4655 ( )
Norm@50keV : 2.09641E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.08 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 56 degrees of freedom
# Null hypothesis probability = 4.718627e-01
Photon flux (15-150 keV) in 1 sec: 1.22110 ( -0.335789 0.33582 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.33993e-08 ( -2.64241e-08 2.80377e-08 ) ergs/cm2
Band function
Time interval is from 6.064 sec. to 7.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.11987 ( -1.31922 2.35155 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 71.7509 ( -37.4538 -71.8195 )
Norm@50keV : 1.92458E-02 ( -0.0191607 0.22882 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.09 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 55 degrees of freedom
# Null hypothesis probability = 4.339105e-01
Photon flux (15-150 keV) in 1 sec: 1.22162 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.32869e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.4741 (-4.38034 5.25814)
R^2/D10^2 : 0.158923 (-0.106733 0.403312)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.42 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 57 degrees of freedom
# Null hypothesis probability = 3.874050e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.007e-09 4.324e-09
25- 50 2.692e-08 1.469e-08
50-150 3.776e-08 2.306e-08
15-150 7.169e-08 4.038e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 133.434 (-79.9511 -130.645)
Norm : 5.21287 (-1.49416 2.3023)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.15 using 59 PHA bins.
# Reduced chi-squared = 0.9852 for 57 degrees of freedom
# Null hypothesis probability = 5.067831e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.350e-08 7.960e-09
25- 50 2.459e-08 1.416e-08
50-150 4.614e-08 3.043e-08
15-150 8.423e-08 5.230e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.72522 (-2.14714 4.23356)
R1^2/D10^2 : 5.96408 (-5.51995 94.0525)
kT2 [keV] : 19.3398 (-6.09424 14.6045)
R2^2/D10^2 : 4.68129E-02 (-0.0411431 0.0876525)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.63 using 59 PHA bins.
# Reduced chi-squared = 0.9933 for 55 degrees of freedom
# Null hypothesis probability = 4.887596e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.492e-08 8.870e-09
25- 50 2.317e-08 1.250e-08
50-150 4.612e-08 2.914e-08
15-150 8.422e-08 4.573e-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: 1.58938 ( -0.192205 0.195119 )
Norm@50keV : 6.55026E-03 ( -0.000748981 0.000742182 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.76 using 59 PHA bins.
# Reduced chi-squared = 1.136 for 57 degrees of freedom
# Null hypothesis probability = 2.242971e-01
Photon flux (15-150 keV) in 13 sec: 0.838991 ( -0.0933977 0.0935639 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.97415e-07 ( -9.76151e-08 9.87034e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30141 ( -0.761347 0.376133 )
Epeak [keV] : 120.284 ( -120.288 -120.288 )
Norm@50keV : 9.18919E-03 ( -0.00329784 0.0126015 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.22 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 56 degrees of freedom
# Null hypothesis probability = 2.106426e-01
Photon flux (15-150 keV) in 13 sec: 0.828012 ( -0.096869 0.096773 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.80894e-07 ( -1.05294e-07 1.05907e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.26518 ( -0.39819 0.723324 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 114.352 ( -50.5288 -114.315 )
Norm@50keV : 9.55197E-03 ( -0.00363702 0.00632839 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.23 using 59 PHA bins.
# Reduced chi-squared = 1.168 for 55 degrees of freedom
# Null hypothesis probability = 1.845812e-01
Photon flux (15-150 keV) in 13 sec: 0.826837 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.78791e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 2.06e-07
S(50-100 keV) = 2.73e-07
T90 vs. Hardness ratio plot
T90 = 12 sec.
Hardness ratio (energy fluence ratio) = 1.32524
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.21845
Count Ratio (50-100 keV) / (15-25 keV) = 1.05035
Mask shadow pattern
IMX = 3.262225522227327E-01, IMY = -6.373634552866851E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
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:
-151.835400 -0.936000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
255.9731 -37.7834 4.7 47.4 33.7 1.3892 2.5 3.7 4U 1700-377
256.4128 -36.5258 6.2 46.5 35.0 0.9540 1.9 6.3 GX 349+2
263.1519 -24.7934 12.1 36.1 47.1 0.2759 1.0 8.3 GX 1+4
264.7008 -44.5478 5.5 46.2 20.9 -0.7886 -2.1 6.1 4U 1735-44
268.3858 -1.5916 3.7 28.4 90.2 0.7956 3.1 8.4 SW J1753.5-0127
270.3030 -25.1158 2.3 30.4 41.2 1.1275 5.2 2.4 GX 5-1
270.1961 -25.5514 0.0 30.8 40.6 0.1424 0.6 12.9 GRS 1758-258
273.8386 -14.0877 8.2 23.0 61.0 0.2751 1.4 10.2 GX 17+2
276.0702 -30.4203 7.1 29.8 26.6 0.3429 1.6 8.2 H1820-303
285.0277 -24.9104 19.3 20.5 20.0 0.0935 0.6 0.8 HT1900.1-2455
288.7853 10.9427 1.0 19.8 147.6 2.0472 11.6 0.8 GRS 1915+105
299.4471 35.1884 4.1 42.7 173.6 0.7849 2.8 7.1 Cyg X-1
308.0752 40.9580 127.1 49.6 -178.5 -0.0341 -0.1 1.6 Cyg X-3
326.3125 38.4074 11.6 53.7 -161.1 -0.5093 -1.0 8.4 Cyg X-2
263.1460 -33.8376 6.3 40.4 34.2 0.5760 1.8 7.8 GX 354-0
329.9779 26.8726 2.9 47.4 -147.9 1.4478 4.0 ------ UNKNOWN
338.2525 3.8806 2.9 43.4 -114.0 3.3492 4.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.936000 12.064000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
255.8484 -37.7947 5.2 47.5 33.8 0.3449 2.2 7.2 4U 1700-377
256.4641 -36.4534 6.9 46.4 35.0 0.2359 1.7 2.3 GX 349+2
263.1129 -24.6411 19.8 36.1 47.4 0.0465 0.6 8.4 GX 1+4
264.7083 -44.2657 7.6 46.0 21.2 0.1531 1.5 11.2 4U 1735-44
268.2431 -1.3229 6.9 28.6 90.7 -0.1132 -1.7 10.8 SW J1753.5-0127
270.3202 -25.1807 5.4 30.5 41.1 -0.1272 -2.1 6.4 GX 5-1
270.1217 -25.8296 0.0 31.0 40.2 0.0494 0.8 11.1 GRS 1758-258
273.9234 -14.1482 10.7 22.9 60.8 -0.0553 -1.1 8.2 GX 17+2
275.7821 -30.3052 18.3 29.9 27.1 -0.0338 -0.6 8.3 H1820-303
285.0731 -25.0831 11.9 20.6 19.6 0.0375 1.0 10.0 HT1900.1-2455
288.9598 11.0032 7.3 19.8 148.1 0.0686 1.6 10.1 GRS 1915+105
299.5035 35.2388 4.8 42.8 173.7 -0.1652 -2.4 4.8 Cyg X-1
308.0399 40.8451 5.5 49.5 -178.5 -0.1919 -2.1 7.2 Cyg X-3
326.0749 38.3616 5.7 53.5 -161.2 0.2317 2.0 5.1 Cyg X-2
262.8868 -33.6626 6.9 40.5 34.6 0.1535 1.7 11.5 GX 354-0
260.8751 -15.7997 0.9 35.6 62.9 1.2228 12.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
93.164590 962.121800
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9764 -15.6409 0.2 15.3 84.1 43.9858 74.5 0.2 Sco X-1
254.5739 35.3274 92.5 51.5 169.1 0.2781 0.1 5.8 Her X-1
256.0032 -37.8416 0.8 22.5 5.8 8.8918 13.9 0.8 4U 1700-377
256.4409 -36.4112 2.4 21.0 5.7 3.1051 4.9 0.8 GX 349+2
263.0459 -24.7103 1.8 9.1 -16.7 3.8616 6.4 2.9 GX 1+4
264.7412 -44.3005 4.9 28.7 -10.1 1.6642 2.4 9.0 4U 1735-44
268.2169 -1.5914 0.0 15.9 -156.7 0.7825 1.2 12.3 SW J1753.5-0127
270.2649 -25.0666 1.6 12.8 -46.2 4.7807 7.4 1.3 GX 5-1
270.1938 -25.7676 4.1 13.2 -43.9 1.8197 2.8 6.1 GRS 1758-258
273.9519 -14.0155 3.6 12.7 -100.7 2.1030 3.2 3.4 GX 17+2
275.8383 -30.3728 2.4 20.0 -44.9 3.1763 4.9 4.5 H1820-303
285.1241 -24.7728 7.4 24.4 -68.8 1.4471 1.5 10.1 HT1900.1-2455
288.8067 10.9401 1.5 38.4 -136.7 9.3430 7.9 0.6 GRS 1915+105
262.9767 -33.7750 4.8 18.1 -9.9 1.4856 2.4 3.6 GX 354-0
222.6842 -22.4776 2.4 36.6 69.1 7.8125 4.7 ------ UNKNOWN
246.2664 -67.0554 3.4 52.1 2.8 5.7477 3.4 ------ UNKNOWN
283.4214 -64.1239 5.0 50.7 -16.8 3.3309 2.3 ------ UNKNOWN
299.2049 11.4660 3.0 46.7 -127.8 10.8033 3.9 ------ UNKNOWN
308.4892 -48.0925 4.8 50.5 -44.1 8.3747 2.4 ------ UNKNOWN
Plot creation:
Sat May 30 22:50:05 EDT 2015