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
345.0743 -5.3791 0.0027 32.5726 132.5131 31.5073645 72.082 TRIG_00576238
Foreground time interval of the image:
-5.504 12.085 (delta_t = 17.589 [sec])
Background time interval of the image:
-184.915 -5.504 (delta_t = 179.411 [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)
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 -5.504 sec. to 143.368 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29237 ( -0.0270263 0.0269513 )
Norm@50keV : 1.97692E-02 ( -0.000291084 0.000290653 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.43 using 59 PHA bins.
# Reduced chi-squared = 0.6391 for 57 degrees of freedom
# Null hypothesis probability = 9.845989e-01
Photon flux (15-150 keV) in 148.9 sec: 2.35524 ( -0.0398744 0.0400134 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.9143e-05 ( -4.08253e-07 4.08285e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.504 sec. to 143.368 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16190 ( -0.112743 0.110075 )
Epeak [keV] : 404.562 ( -156.46 1542.23 )
Norm@50keV : 2.22737E-02 ( -0.0020841 0.00236119 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.37 using 59 PHA bins.
# Reduced chi-squared = 0.5780 for 56 degrees of freedom
# Null hypothesis probability = 9.952403e-01
Photon flux (15-150 keV) in 148.9 sec: 2.32813 ( -0.04518 0.04548 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.90035e-05 ( -4.29428e-07 4.28534e-07 ) ergs/cm2
Band function
Time interval is from -5.504 sec. to 143.368 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.16190 ( 0.840035 5.57435 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 404.508 ( -126.788 1540.5 )
Norm@50keV : 2.22710E-02 ( -0.000309314 0.0023534 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.37 using 59 PHA bins.
# Reduced chi-squared = 0.5885 for 55 degrees of freedom
# Null hypothesis probability = 9.935923e-01
Photon flux (15-150 keV) in 148.9 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] : 21.4772 ( )
R^2/D10^2 : 8.08852E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 910.14 using 59 PHA bins.
# Reduced chi-squared = 15.967 for 57 degrees of freedom
# Null hypothesis probability = 5.388604e-154
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.039e-06 3.417e-08
25- 50 5.417e-06 1.295e-07
50-150 1.865e-05 3.499e-07
15-150 2.511e-05 3.946e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 10.3186 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 428.23 using 59 PHA bins.
# Reduced chi-squared = 7.5128 for 57 degrees of freedom
# Null hypothesis probability = 2.539502e-58
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.826e-06 7.296e-08
25- 50 7.360e-06 1.251e-07
50-150 1.614e-05 2.755e-07
15-150 2.733e-05 4.839e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.44437 (-0.53414 0.563669)
R1^2/D10^2 : 1.07907 (-0.207448 0.270262)
kT2 [keV] : 33.1550 (-1.71574 2.03359)
R2^2/D10^2 : 1.61340E-02 (-0.00296243 0.00326171)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.23 using 59 PHA bins.
# Reduced chi-squared = 0.8405 for 55 degrees of freedom
# Null hypothesis probability = 7.941809e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.538e-06 1.519e-07
25- 50 6.611e-06 1.906e-07
50-150 1.973e-05 5.286e-07
15-150 2.888e-05 6.403e-07
Peak spectrum fit
Power-law model
Time interval is from 6.400 sec. to 7.400 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.959001 ( -0.0450581 0.0448149 )
Norm@50keV : 0.244432 ( -0.00641878 0.00640943 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.40 using 59 PHA bins.
# Reduced chi-squared = 1.463 for 57 degrees of freedom
# Null hypothesis probability = 1.289297e-02
Photon flux (15-150 keV) in 1 sec: 28.0911 ( -0.748128 0.748619 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.68266e-06 ( -7.3729e-08 7.37075e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.400 sec. to 7.400 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.584711 ( -0.190692 0.183153 )
Epeak [keV] : 229.293 ( -56.7641 153.248 )
Norm@50keV : 0.351735 ( -0.0560478 0.0692424 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.76 using 59 PHA bins.
# Reduced chi-squared = 1.264 for 56 degrees of freedom
# Null hypothesis probability = 8.853009e-02
Photon flux (15-150 keV) in 1 sec: 27.6834 ( -0.7698 0.7708 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.65529e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 6.400 sec. to 7.400 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.883813 ( 0.883763 0.883763 )
beta : -0.958830 ( -0.0448026 0.0450742 )
Epeak [keV] : 13.1567 ( )
Norm@50keV : 0.370373 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.40 using 59 PHA bins.
# Reduced chi-squared = 1.516 for 55 degrees of freedom
# Null hypothesis probability = 8.039099e-03
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] : 23.4800 ( )
R^2/D10^2 : 0.841295 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 266.99 using 59 PHA bins.
# Reduced chi-squared = 4.6841 for 57 degrees of freedom
# Null hypothesis probability = 6.518544e-29
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.321e-08 4.485e-09
25- 50 4.567e-07 1.730e-08
50-150 1.879e-06 6.800e-08
15-150 2.419e-06 7.300e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 114.783 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 549.60 using 59 PHA bins.
# Reduced chi-squared = 9.6420 for 57 degrees of freedom
# Null hypothesis probability = 1.039176e-81
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.858e-07 7.650e-09
25- 50 5.498e-07 1.440e-08
50-150 1.206e-06 3.350e-08
15-150 2.041e-06 5.700e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.73428 (-1.13418 1.24346)
R1^2/D10^2 : 6.47866 (-1.77551 2.71132)
kT2 [keV] : 37.4038 (-3.71673 5.27841)
R2^2/D10^2 : 0.168244 (-0.0570161 0.0682316)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.44 using 59 PHA bins.
# Reduced chi-squared = 1.190 for 55 degrees of freedom
# Null hypothesis probability = 1.584089e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.557e-07 1.590e-08
25- 50 5.090e-07 4.270e-08
50-150 2.011e-06 1.540e-07
15-150 2.675e-06 1.905e-07
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: 1.07582 ( -0.0243333 0.024232 )
Norm@50keV : 0.125838 ( -0.00182517 0.00182144 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.55 using 59 PHA bins.
# Reduced chi-squared = 0.8518 for 57 degrees of freedom
# Null hypothesis probability = 7.795917e-01
Photon flux (15-150 keV) in 17.59 sec: 14.5641 ( -0.22513 0.225609 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33243e-05 ( -3.1088e-07 3.10865e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.793311 ( -0.105205 0.103005 )
Epeak [keV] : 279.083 ( -57.2563 117.569 )
Norm@50keV : 0.161732 ( -0.0138525 0.0154064 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 26.06 using 59 PHA bins.
# Reduced chi-squared = 0.4654 for 56 degrees of freedom
# Null hypothesis probability = 9.997875e-01
Photon flux (15-150 keV) in 17.59 sec: 14.3095 ( -0.2391 0.2402 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32248e-05 ( 0 0 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.541180 ( -0.334809 1.02885 )
beta : -1.18786 ( 1.18894 0.0665274 )
Epeak [keV] : 142.961 ( -86.8022 229.308 )
Norm@50keV : 0.220735 ( -0.0675329 0.403043 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 25.41 using 59 PHA bins.
# Reduced chi-squared = 0.4620 for 55 degrees of freedom
# Null hypothesis probability = 9.997856e-01
Photon flux (15-150 keV) in 17.59 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) = 6.46e-06
S(50-100 keV) = 1.05e-05
T90 vs. Hardness ratio plot
T90 = 39.4239999651909 sec.
Hardness ratio (energy fluence ratio) = 1.62539
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.55646
Count Ratio (50-100 keV) / (15-25 keV) = 1.44869
Mask shadow pattern
IMX = -4.317096005067170E-01, IMY = -4.709127232910389E-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:
-184.915400 -5.504000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
288.7967 10.9656 1.0 29.0 -83.2 3.2781 11.4 1.2 GRS 1915+105
299.7585 35.2146 3.7 27.4 -25.9 0.6775 3.1 8.3 Cyg X-1
308.1193 40.9394 1.4 28.8 -7.6 1.8057 8.2 0.9 Cyg X-3
326.1099 38.4276 3.3 25.8 22.6 0.7707 3.5 7.0 Cyg X-2
358.5619 6.1894 2.0 40.2 105.2 4.4192 5.7 381.2 UNKNOWN
313.0938 58.2277 2.0 44.8 4.7 2.0440 5.8 ------ UNKNOWN
317.8845 -34.7115 2.6 48.3 -170.8 1.7114 4.4 ------ UNKNOWN
297.3943 30.2143 1.0 25.5 -37.3 2.5002 12.1 ------ UNKNOWN
276.5581 10.4018 2.7 41.0 -81.1 3.6728 4.3 ------ UNKNOWN
286.2437 -24.1716 2.9 49.1 -131.4 3.7785 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-5.504000 12.084600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
288.6737 10.8187 32.1 29.2 -83.5 -0.0950 -0.4 10.6 GRS 1915+105
299.6769 35.1359 9.0 27.4 -26.2 -0.3193 -1.3 5.8 Cyg X-1
308.0805 40.9057 66.1 28.8 -7.7 0.0441 0.2 3.1 Cyg X-3
326.2459 38.1768 43.9 25.6 23.1 -0.0710 -0.3 9.4 Cyg X-2
347.0646 -20.2714 3.0 44.1 148.3 2.8106 3.9 ------ UNKNOWN
345.0743 -5.3791 0.2 32.6 132.5 31.5048 72.1 ------ UNKNOWN
304.3306 61.1017 2.8 48.6 -0.4 2.0369 4.1 ------ UNKNOWN
287.7227 57.8495 3.2 49.9 -12.1 1.6778 3.7 ------ UNKNOWN
289.0871 -29.7443 2.8 51.7 -138.6 3.2246 4.1 ------ UNKNOWN
279.3776 -0.2760 4.5 41.1 -97.9 2.0880 2.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
67.284660 963.079300
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.6048 35.1610 3.9 58.9 -20.8 10.9263 3.0 2.5 Cyg X-1
308.1618 41.0038 4.3 57.4 -10.4 7.9868 2.7 3.9 Cyg X-3
326.2341 38.2690 5.7 47.0 1.9 2.2096 2.0 4.3 Cyg X-2
16.9506 15.9820 2.5 38.1 77.5 9.2021 4.6 ------ UNKNOWN
6.2787 23.0788 2.5 35.2 57.4 5.1988 4.5 ------ UNKNOWN
345.0583 -5.4278 2.3 0.1 -155.9 2.8339 5.0 ------ UNKNOWN
336.2429 -53.7329 3.0 48.9 -150.9 5.9247 3.8 ------ UNKNOWN
306.7380 -23.5614 3.9 41.1 -98.0 11.2085 3.0 ------ UNKNOWN
Plot creation:
Sat May 30 15:16:03 EDT 2015