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
307.3238 -11.8794 0.0153 28.1062 177.8328 1.4999290 12.520 TRIG_00539358
Foreground time interval of the image:
-6.240 53.701 (delta_t = 59.941 [sec])
Background time interval of the image:
-179.200 -6.240 (delta_t = 172.960 [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)
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 -6.240 sec. to 419.228 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72437 ( -0.0421709 0.0423149 )
Norm@50keV : 3.36555E-03 ( -7.54679e-05 7.54049e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 91.47 using 59 PHA bins.
# Reduced chi-squared = 1.605 for 57 degrees of freedom
# Null hypothesis probability = 2.549772e-03
Photon flux (15-150 keV) in 425.5 sec: 0.450860 ( -0.0111209 0.0111562 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32352e-05 ( -3.05588e-07 3.05995e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.240 sec. to 419.228 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.986757 ( -0.203542 0.194707 )
Epeak [keV] : 69.8665 ( -5.44064 8.02861 )
Norm@50keV : 7.64938E-03 ( -0.00146091 0.00190441 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.56 using 59 PHA bins.
# Reduced chi-squared = 0.7958 for 56 degrees of freedom
# Null hypothesis probability = 8.643801e-01
Photon flux (15-150 keV) in 425.5 sec: 0.424826 ( -0.012619 0.012685 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24315e-05 ( -3.63334e-07 3.64739e-07 ) ergs/cm2
Band function
Time interval is from -6.240 sec. to 419.228 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.811688 ( -0.324477 0.611708 )
beta : -2.21427 ( 2.21427 0.246153 )
Epeak [keV] : 62.7011 ( -13.6141 12.962 )
Norm@50keV : 9.62791E-03 ( -0.00312691 0.012981 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.45 using 59 PHA bins.
# Reduced chi-squared = 0.7900 for 55 degrees of freedom
# Null hypothesis probability = 8.696262e-01
Photon flux (15-150 keV) in 425.5 sec: 0.422766 ( 6.57723 -0.013111 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24686e-05 ( -1.24656e-05 -3.67377e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.0974 ( )
R^2/D10^2 : 5.82241E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 303.80 using 59 PHA bins.
# Reduced chi-squared = 5.3298 for 57 degrees of freedom
# Null hypothesis probability = 2.243485e-35
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.039e-06 4.446e-08
25- 50 3.892e-06 1.187e-07
50-150 5.111e-06 2.149e-07
15-150 1.004e-05 2.319e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 127.971 (-11.8832 14.4235)
Norm : 1.87591 (-0.0597301 0.0618426)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.76 using 59 PHA bins.
# Reduced chi-squared = 0.8906 for 57 degrees of freedom
# Null hypothesis probability = 7.067831e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.073e-06 1.119e-07
25- 50 3.749e-06 1.511e-07
50-150 6.900e-06 1.474e-06
15-150 1.272e-05 1.540e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.50894 (-0.766284 0.801983)
R1^2/D10^2 : 0.348467 (-0.0934988 0.146173)
kT2 [keV] : 22.6231 (-2.03032 2.72591)
R2^2/D10^2 : 7.55406E-03 (-0.00282975 0.00367193)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.15 using 59 PHA bins.
# Reduced chi-squared = 0.8936 for 55 degrees of freedom
# Null hypothesis probability = 6.966267e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.737e-06 1.570e-07
25- 50 3.860e-06 2.089e-07
50-150 6.654e-06 5.234e-07
15-150 1.225e-05 6.808e-07
Peak spectrum fit
Power-law model
Time interval is from 232.564 sec. to 233.564 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19829 ( -0.126594 0.125874 )
Norm@50keV : 2.04276E-02 ( -0.00152671 0.00152624 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.15 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 57 degrees of freedom
# Null hypothesis probability = 2.142985e-01
Photon flux (15-150 keV) in 1 sec: 2.39720 ( -0.18144 0.181593 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.07347e-07 ( -1.75022e-08 1.76199e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 232.564 sec. to 233.564 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.633418 ( -0.578094 0.508088 )
Epeak [keV] : 127.103 ( -40.1474 507.406 )
Norm@50keV : 3.84260E-02 ( -0.0163487 0.0334527 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.51 using 59 PHA bins.
# Reduced chi-squared = 1.098 for 56 degrees of freedom
# Null hypothesis probability = 2.854719e-01
Photon flux (15-150 keV) in 1 sec: 2.34506 ( -0.188 0.18768 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.99531e-07 ( -1.9234e-08 1.9181e-08 ) ergs/cm2
Band function
Time interval is from 232.564 sec. to 233.564 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.293053 ( -0.772 0.281996 )
beta : -1.49806 ( 1.49991 0.306736 )
Epeak [keV] : 85.2614 ( -52.1373 159.639 )
Norm@50keV : 6.18496E-02 ( -0.043939 208.999 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.13 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 55 degrees of freedom
# Null hypothesis probability = 2.652878e-01
Photon flux (15-150 keV) in 1 sec: 2.33856 ( 4.66144 -0.18788 ) 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] : 17.8907 (-1.66068 1.88219)
R^2/D10^2 : 0.160969 (-0.0453828 0.0613673)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.21 using 59 PHA bins.
# Reduced chi-squared = 1.512 for 57 degrees of freedom
# Null hypothesis probability = 7.503305e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.034e-08 1.455e-09
25- 50 4.758e-08 4.920e-09
50-150 1.104e-07 1.348e-08
15-150 1.683e-07 1.565e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 9.79470 (-0.744411 0.744379)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.89 using 59 PHA bins.
# Reduced chi-squared = 1.454 for 57 degrees of freedom
# Null hypothesis probability = 1.416922e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.439e-08 2.100e-09
25- 50 4.691e-08 7.135e-09
50-150 1.029e-07 4.010e-08
15-150 1.742e-07 5.118e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.18930 (-2.86359 3.1264)
R1^2/D10^2 : 0.817288 (-0.429761 1.04701)
kT2 [keV] : 31.4487 (-8.34527 28.0332)
R2^2/D10^2 : 1.92678E-02 (-0.0164591 0.0399887)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.49 using 59 PHA bins.
# Reduced chi-squared = 1.118 for 55 degrees of freedom
# Null hypothesis probability = 2.548856e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.647e-08 6.381e-09
25- 50 4.800e-08 1.697e-08
50-150 1.367e-07 6.552e-08
15-150 2.012e-07 7.830e-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: 1.76533 ( -0.166841 0.171572 )
Norm@50keV : 1.64798E-03 ( -0.000188646 0.000186533 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.88 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 57 degrees of freedom
# Null hypothesis probability = 3.061938e-01
Photon flux (15-150 keV) in 59.94 sec: 0.224108 ( -0.0225966 0.0226057 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.10698e-07 ( -1.06437e-07 1.08402e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.192835 ( -1.25753 0.983229 )
Epeak [keV] : 46.8134 ( -5.8089 9.80989 )
Norm@50keV : 2.15449E-02 ( -0.0215473 0.0912812 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.41 using 59 PHA bins.
# Reduced chi-squared = 0.8466 for 56 degrees of freedom
# Null hypothesis probability = 7.862329e-01
Photon flux (15-150 keV) in 59.94 sec: 0.209174 ( -0.023371 0.023473 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.64679e-07 ( -1.04463e-07 1.16787e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.617544 ( -1.27727 1.88832 )
beta : -3.12662 ( 3.12282 0.909967 )
Epeak [keV] : 44.3153 ( -8.85081 10.1512 )
Norm@50keV : 3.95697E-02 ( -0.0344649 0.625183 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.77 using 59 PHA bins.
# Reduced chi-squared = 0.8504 for 55 degrees of freedom
# Null hypothesis probability = 7.772310e-01
Photon flux (15-150 keV) in 59.94 sec: 0.209288 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.92023e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 3.62e-06
S(50-100 keV) = 4.38e-06
T90 vs. Hardness ratio plot
T90 = 326.091999948025 sec.
Hardness ratio (energy fluence ratio) = 1.20994
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.39562
Count Ratio (50-100 keV) / (15-25 keV) = 0.874806
Mask shadow pattern
IMX = -5.337062704727726E-01, IMY = -2.019652793920537E-02
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:
-179.200000 -6.240000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4187 35.4994 7.6 40.8 1.3 -0.4183 -1.5 9.6 Her X-1
263.1398 -24.6549 12.5 40.0 -101.3 0.7160 0.9 9.0 GX 1+4
268.3323 -1.5094 2.0 20.9 -72.0 1.2093 5.9 4.0 SW J1753.5-0127
270.2216 -25.0957 3.7 36.8 -110.3 1.1029 3.2 3.5 GX 5-1
270.3714 -25.8509 3.1 37.4 -111.1 1.3379 3.7 7.5 GRS 1758-258
273.9355 -13.9275 4.8 25.4 -105.2 0.4940 2.4 7.7 GX 17+2
275.7883 -30.4511 10.3 39.8 -121.0 0.4562 1.1 8.7 H1820-303
285.1089 -24.7924 29.0 32.6 -133.0 -0.0902 -0.4 8.6 HT1900.1-2455
288.8193 10.9012 1.8 3.5 71.6 1.2004 6.5 2.9 GRS 1915+105
299.7999 35.1594 5.3 29.7 64.8 0.6388 2.2 10.6 Cyg X-1
308.1983 41.0242 2.5 38.1 69.7 2.7478 4.7 5.9 Cyg X-3
334.9857 -15.9748 2.7 53.0 160.4 3.7753 4.3 ------ UNKNOWN
330.2602 -31.0988 3.2 56.7 179.2 3.8489 3.6 ------ UNKNOWN
312.1636 -24.4193 2.1 40.4 -172.8 1.3875 5.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-6.240000 53.700640
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4250 35.4129 55.2 40.7 1.2 0.0347 0.2 4.5 Her X-1
262.9354 -24.6505 7.8 40.1 -101.0 0.6350 1.5 7.0 GX 1+4
268.3442 -1.5048 5.3 20.9 -72.0 -0.2664 -2.2 3.4 SW J1753.5-0127
270.3139 -25.2137 7.2 36.8 -110.5 0.3473 1.6 8.2 GX 5-1
270.3123 -25.5996 4.1 37.2 -110.8 0.6498 3.0 8.6 GRS 1758-258
274.0356 -13.9002 8.4 25.3 -105.4 -0.1745 -1.4 8.4 GX 17+2
275.9918 -30.2277 4.3 39.5 -121.2 0.6039 2.7 9.0 H1820-303
285.2260 -24.9599 4.9 32.8 -133.2 0.3198 2.3 10.6 HT1900.1-2455
288.9227 11.0347 35.4 3.7 72.0 -0.0328 -0.3 9.1 GRS 1915+105
299.5535 35.0974 14.3 29.6 64.5 0.1341 0.8 6.5 Cyg X-1
308.2711 41.0354 5.4 38.2 69.7 -0.6964 -2.2 8.8 Cyg X-3
307.3238 -11.8793 0.9 28.1 177.8 1.4998 12.5 ------ UNKNOWN
286.3283 -37.2860 2.5 45.1 -135.5 1.2417 4.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
111.500600 467.291700
468.800000 662.880000
720.800000 782.890000
900.800000 962.884200
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
268.2191 -1.3845 311.4 40.2 -60.4 -0.0439 -0.0 9.8 SW J1753.5-0127
270.3528 -25.0830 3.3 37.4 -98.6 4.3940 3.5 3.7 GX 5-1
270.2423 -25.7676 3.3 37.6 -99.6 4.7491 3.5 3.6 GRS 1758-258
274.0696 -14.0631 2.2 32.5 -80.2 4.5178 5.3 4.0 GX 17+2
275.9499 -30.3870 33.8 34.5 -110.0 0.2801 0.3 1.8 H1820-303
285.2043 -24.9233 7.0 24.7 -107.6 0.9472 1.6 9.2 HT1900.1-2455
288.7596 10.9400 1.9 29.3 -22.3 3.2632 6.2 2.3 GRS 1915+105
299.7766 35.1077 5.5 47.5 9.0 2.3017 2.1 10.7 Cyg X-1
307.9913 40.9329 5.4 52.8 18.1 5.7200 2.1 5.5 Cyg X-3
307.3174 -11.8565 0.3 0.1 -100.5 22.9955 44.7 ------ UNKNOWN
331.9160 -66.5961 3.0 57.2 -173.9 9.8885 3.8 ------ UNKNOWN
275.0118 35.0206 3.6 56.0 -14.5 5.7086 3.2 ------ UNKNOWN
268.4098 29.0958 2.3 55.6 -24.3 8.1171 5.0 ------ UNKNOWN
267.4992 21.7498 2.6 51.6 -32.0 6.3311 4.5 ------ UNKNOWN
Plot creation:
Sat May 30 17:53:50 EDT 2015