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
329.9315 26.4719 0.0252 18.9451 147.6612 0.0677049 7.655 TRIG_00442039
Foreground time interval of the image:
-0.072 0.504 (delta_t = 0.576 [sec])
Background time interval of the image:
-239.024 -0.072 (delta_t = 238.952 [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 0.512000
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 0.512000
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 0.512000
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 -0.072 sec. to 0.504 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.12372 ( -0.423852 0.496848 )
Norm@50keV : 5.54291E-03 ( -0.00189762 0.00183566 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.64 using 59 PHA bins.
# Reduced chi-squared = 0.8182 for 57 degrees of freedom
# Null hypothesis probability = 8.347757e-01
Photon flux (15-150 keV) in 0.576 sec: 0.882392 ( -0.207488 0.207597 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.97361e-08 ( -8.72582e-09 9.34675e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.072 sec. to 0.504 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.882811 ( -3.33248 1.26705 )
Epeak [keV] : 33.7015 ( )
Norm@50keV : 3.25731E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.47 using 59 PHA bins.
# Reduced chi-squared = 0.8120 for 56 degrees of freedom
# Null hypothesis probability = 8.415608e-01
Photon flux (15-150 keV) in 0.576 sec: 0.857625 ( -0.205038 0.209455 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.63934e-08 ( -8.17344e-09 1.0511e-08 ) ergs/cm2
Band function
Time interval is from -0.072 sec. to 0.504 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.950647 ( -2.31702 5.85433 )
beta : -10.0000 ( 10 1.24345e-13 )
Epeak [keV] : 33.6443 ( -20.0084 -33.6434 )
Norm@50keV : 2.94725E-02 ( -0.0294744 4.70984 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.47 using 59 PHA bins.
# Reduced chi-squared = 0.8268 for 55 degrees of freedom
# Null hypothesis probability = 8.164871e-01
Photon flux (15-150 keV) in 0.576 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] : 8.68177 (-2.01362 2.62037)
R^2/D10^2 : 0.729682 (-0.469886 1.31359)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.23 using 59 PHA bins.
# Reduced chi-squared = 0.8287 for 57 degrees of freedom
# Null hypothesis probability = 8.184590e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.047e-09 2.661e-09
25- 50 1.214e-08 6.119e-09
50-150 4.142e-09 2.843e-09
15-150 2.233e-08 1.191e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 49.6004 (-22.7366 62.2219)
Norm : 5.09581 (-1.69127 2.80402)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.58 using 59 PHA bins.
# Reduced chi-squared = 0.7997 for 57 degrees of freedom
# Null hypothesis probability = 8.615013e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.164e-09 2.435e-09
25- 50 1.026e-08 4.315e-09
50-150 9.885e-09 6.868e-09
15-150 2.731e-08 1.371e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.55403 (-4.55699 80.3742)
R1^2/D10^2 : 4.69150 (-4.67649 -4.67649)
kT2 [keV] : 12.2877 (-12.2964 -12.2964)
R2^2/D10^2 : 0.139993 (-0.139406 1.2335)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.58 using 59 PHA bins.
# Reduced chi-squared = 0.8287 for 55 degrees of freedom
# Null hypothesis probability = 8.135190e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.033e-09 3.747e-09
25- 50 1.064e-08 5.803e-09
50-150 7.751e-09 4.524e-09
15-150 2.542e-08 1.372e-08
Peak spectrum fit
Power-law model
Time interval is from -0.284 sec. to 0.716 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84172 ( -0.499921 0.561888 )
Norm@50keV : 3.61406E-03 ( -0.00135356 0.00130995 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.66 using 59 PHA bins.
# Reduced chi-squared = 1.310 for 57 degrees of freedom
# Null hypothesis probability = 5.821682e-02
Photon flux (15-150 keV) in 1 sec: 0.506297 ( -0.1528 0.152809 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.32493e-08 ( -1.18952e-08 1.27971e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.284 sec. to 0.716 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.126382 ( -5.18749 2.37922 )
Epeak [keV] : 42.1805 ( )
Norm@50keV : 5.49870E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.64 using 59 PHA bins.
# Reduced chi-squared = 1.297 for 56 degrees of freedom
# Null hypothesis probability = 6.673188e-02
Photon flux (15-150 keV) in 1 sec: 0.480110 ( -0.150055 0.152958 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.74127e-08 ( -1.0071e-08 1.37189e-08 ) ergs/cm2
Band function
Time interval is from -0.284 sec. to 0.716 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.94524 ( -4.94524 -4.94524 )
beta : -2.29295 ( 2.29295 0.721358 )
Epeak [keV] : 27.1515 ( -27.1515 11.3112 )
Norm@50keV : 313.701 ( -91.6701 4.19187e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.69 using 59 PHA bins.
# Reduced chi-squared = 1.322 for 55 degrees of freedom
# Null hypothesis probability = 5.527500e-02
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] : 10.1835 (-2.73976 3.97644)
R^2/D10^2 : 0.237447 (-0.237384 0.532152)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.02 using 59 PHA bins.
# Reduced chi-squared = 1.281 for 57 degrees of freedom
# Null hypothesis probability = 7.489696e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.045e-09 3.115e-09
25- 50 1.287e-08 7.449e-09
50-150 7.077e-09 5.400e-09
15-150 2.499e-08 1.539e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 74.6932 (-42.0611 -74.6673)
Norm : 2.47951 (-0.861058 1.4333)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.58 using 59 PHA bins.
# Reduced chi-squared = 1.291 for 57 degrees of freedom
# Null hypothesis probability = 6.885087e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.401e-09 3.934e-09
25- 50 1.036e-08 6.370e-09
50-150 1.395e-08 1.225e-08
15-150 3.071e-08 2.164e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.98757 (-6.18009 -6.18009)
R1^2/D10^2 : 0.529928 ( )
kT2 [keV] : 14.9788 (-15.1742 -15.1742)
R2^2/D10^2 : 3.32967E-02 (-0.0294741 0.655696)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.63 using 59 PHA bins.
#Fit statistic : Chi-Squared = 72.53 using 59 PHA bins.
# Reduced chi-squared = 1.320 for 55 degrees of freedom
# Reduced chi-squared = 1.319 for 55 degrees of freedom
# Null hypothesis probability = 5.583161e-02
# Null hypothesis probability = 5.674458e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.716e-09 3.367e-09
25- 50 1.197e-08 7.915e-09
50-150 9.283e-09 6.470e-09
15-150 2.697e-08 1.938e-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: 2.12372 ( -0.423852 0.496848 )
Norm@50keV : 5.54291E-03 ( -0.00189762 0.00183566 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.64 using 59 PHA bins.
# Reduced chi-squared = 0.8182 for 57 degrees of freedom
# Null hypothesis probability = 8.347757e-01
Photon flux (15-150 keV) in 0.576 sec: 0.882392 ( -0.207488 0.207597 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.97361e-08 ( -8.72582e-09 9.34675e-09 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.882811 ( -3.33248 1.26705 )
Epeak [keV] : 33.7015 ( )
Norm@50keV : 3.25731E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.47 using 59 PHA bins.
# Reduced chi-squared = 0.8120 for 56 degrees of freedom
# Null hypothesis probability = 8.415608e-01
Photon flux (15-150 keV) in 0.576 sec: 0.857625 ( -0.205038 0.209455 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.63934e-08 ( -8.17344e-09 1.0511e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.950647 ( -2.00764 5.85436 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 33.6443 ( -20.0085 -33.6434 )
Norm@50keV : 2.94725E-02 ( -0.0294744 4.70984 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.47 using 59 PHA bins.
# Reduced chi-squared = 0.8268 for 55 degrees of freedom
# Null hypothesis probability = 8.164871e-01
Photon flux (15-150 keV) in 0.576 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) = 9.25e-09
S(50-100 keV) = 8.49e-09
T90 vs. Hardness ratio plot
T90 = 0.523999989032745 sec.
Hardness ratio (energy fluence ratio) = 0.917838
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.01967
Count Ratio (50-100 keV) / (15-25 keV) = 0.488667
Mask shadow pattern
IMX = -2.900177082464261E-01, IMY = -1.836163409222701E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
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:
-239.024000 -0.072000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4926 35.4460 4.9 47.0 -1.4 -0.9177 -2.4 6.4 Her X-1
288.7876 10.9416 1.7 24.2 -61.8 1.7802 6.7 0.7 GRS 1915+105
299.5984 35.1981 1.0 12.0 24.6 2.1719 11.2 0.5 Cyg X-1
308.0999 40.9591 3.0 14.8 61.4 0.9219 3.9 0.6 Cyg X-3
326.1595 38.1987 7.3 19.0 109.6 -0.3884 -1.6 7.4 Cyg X-2
298.0526 -13.7506 3.2 41.2 -100.7 3.9448 3.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.072000 0.504000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4994 35.2441 4.7 47.0 -1.7 0.0439 2.5 6.2 Her X-1
288.7513 11.0131 4.6 24.2 -61.6 -0.0259 -2.5 4.9 GRS 1915+105
299.4413 35.0912 4.7 12.0 23.8 0.0207 2.4 9.9 Cyg X-1
307.8460 40.8826 0.0 14.8 60.6 -0.0162 -1.7 12.7 Cyg X-3
326.2081 38.1135 0.0 18.9 109.9 -0.0109 -1.1 12.6 Cyg X-2
329.9314 26.4717 1.5 18.9 147.7 0.0677 7.7 ------ UNKNOWN
349.8246 7.4302 2.3 43.3 171.5 0.0867 5.1 ------ UNKNOWN
271.0699 35.9951 2.1 33.5 -0.2 0.0620 5.5 ------ UNKNOWN
246.0876 31.9977 2.7 54.4 -4.6 0.1243 4.3 ------ UNKNOWN
304.9515 -7.4822 2.7 33.8 -109.8 0.0662 4.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
59.276600 303.083600
360.976000 860.276580
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
288.8495 10.9351 6.2 41.7 -53.6 2.9795 1.9 3.1 GRS 1915+105
299.5744 35.2029 0.8 27.3 -13.6 6.8711 14.7 0.8 Cyg X-1
308.1354 40.9722 1.8 23.1 4.7 2.9676 6.3 1.6 Cyg X-3
326.0961 38.2878 4.4 12.2 36.0 1.2905 2.6 4.1 Cyg X-2
297.6299 49.1086 2.6 33.6 11.2 2.5792 4.4 ------ UNKNOWN
283.8361 8.5832 4.7 47.1 -53.3 6.3728 2.5 ------ UNKNOWN
306.3748 -7.4569 5.1 40.9 -92.4 5.5785 2.3 ------ UNKNOWN
Plot creation:
Sat May 30 23:10:19 EDT 2015