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
288.0424 -32.3839 0.0235 45.2507 -167.6347 0.3727602 8.184 TRIG_00293707
Foreground time interval of the image:
-1.144 5.876 (delta_t = 7.020 [sec])
Background time interval of the image:
-239.136 -1.144 (delta_t = 237.992 [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)
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 -1.144 sec. to 5.876 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.23792 ( -0.319724 0.365738 )
Norm@50keV : 3.04935E-03 ( -0.000777621 0.000755673 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.07 using 59 PHA bins.
# Reduced chi-squared = 0.8434 for 57 degrees of freedom
# Null hypothesis probability = 7.941128e-01
Photon flux (15-150 keV) in 7.02 sec: 0.515113 ( -0.0944965 0.0945223 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.02399e-07 ( -4.33482e-08 4.49615e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.144 sec. to 5.876 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.614526 ( -1.88346 1.37105 )
Epeak [keV] : 36.3976 ( )
Norm@50keV : 2.56220E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.77 using 59 PHA bins.
# Reduced chi-squared = 0.7816 for 56 degrees of freedom
# Null hypothesis probability = 8.825940e-01
Photon flux (15-150 keV) in 7.02 sec: 0.496251 ( -0.09515 0.095089 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.89256e-07 ( -4.04808e-08 4.37683e-08 ) ergs/cm2
Band function
Time interval is from -1.144 sec. to 5.876 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.201056 ( -0.861128 2.57853 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 39.9673 ( -26.2642 13.9392 )
Norm@50keV : 3.93407E-02 ( -0.0391242 0.320051 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.10 using 59 PHA bins.
# Reduced chi-squared = 0.8018 for 55 degrees of freedom
# Null hypothesis probability = 8.536711e-01
Photon flux (15-150 keV) in 7.02 sec: 0.500040 ( 6.49996 -0.090227 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.88857e-07 ( -1.88808e-07 -3.97557e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.97166 (-1.8953 2.21124)
R^2/D10^2 : 0.248355 (-0.134628 0.313221)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.24 using 59 PHA bins.
# Reduced chi-squared = 0.8287 for 57 degrees of freedom
# Null hypothesis probability = 8.184037e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.527e-08 1.222e-08
25- 50 8.734e-08 3.001e-08
50-150 4.521e-08 2.090e-08
15-150 1.678e-07 4.672e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 48.3716 (-16.5937 30.161)
Norm : 3.03013 (-0.790408 1.13126)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.46 using 59 PHA bins.
# Reduced chi-squared = 0.7799 for 57 degrees of freedom
# Null hypothesis probability = 8.869321e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.161e-08 1.151e-08
25- 50 7.323e-08 1.925e-08
50-150 6.889e-08 3.477e-08
15-150 1.937e-07 5.405e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.23143 (-1.98942 4.32288)
R1^2/D10^2 : 13.3821 (-12.9742 18308.7)
kT2 [keV] : 12.2391 (-2.86653 5.81841)
R2^2/D10^2 : 9.74703E-02 (-0.0844701 0.198477)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.50 using 59 PHA bins.
# Reduced chi-squared = 0.7727 for 55 degrees of freedom
# Null hypothesis probability = 8.909464e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.917e-08 2.650e-08
25- 50 7.506e-08 4.184e-08
50-150 6.380e-08 4.054e-08
15-150 1.880e-07 9.986e-08
Peak spectrum fit
Power-law model
Time interval is from 0.804 sec. to 1.804 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.50512 ( -0.629267 0.933876 )
Norm@50keV : 4.52192E-03 ( -0.00452143 0.00229276 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.71 using 59 PHA bins.
# Reduced chi-squared = 0.8896 for 57 degrees of freedom
# Null hypothesis probability = 7.086226e-01
Photon flux (15-150 keV) in 1 sec: 0.891101 ( -0.251521 0.251564 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.52776e-08 ( -1.66784e-08 1.79669e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.804 sec. to 1.804 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.06643 ( -1.98995 -1.98995 )
Epeak [keV] : 339.354 ( )
Norm@50keV : 2.41749E-03 ( -0.00239518 0.00426235 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.47 using 59 PHA bins.
# Reduced chi-squared = 0.9013 for 56 degrees of freedom
# Null hypothesis probability = 6.833063e-01
Photon flux (15-150 keV) in 1 sec: 0.889730 ( -0.251716 0.25052 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.49629e-08 ( -1.63716e-08 1.80177e-08 ) ergs/cm2
Band function
Time interval is from 0.804 sec. to 1.804 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.108021 ( -1.88164 0.107959 )
beta : -2.50562 ( -0.935099 0.628179 )
Epeak [keV] : 3.11031 ( -3.10998 -3.10998 )
Norm@50keV : 21.9652 ( -21.9591 4.87517e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.71 using 59 PHA bins.
# Reduced chi-squared = 0.9220 for 55 degrees of freedom
# Null hypothesis probability = 6.391902e-01
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] : 5.67065 (-2.20432 5.62398)
R^2/D10^2 : 3.75290 (-3.64978 35.2877)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.80 using 59 PHA bins.
# Reduced chi-squared = 0.9965 for 57 degrees of freedom
# Null hypothesis probability = 4.825252e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.472e-08 8.885e-09
25- 50 1.295e-08 8.480e-09
50-150 9.353e-10 8.100e-10
15-150 2.860e-08 1.782e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 38.7658 (-24.7796 72.5787)
Norm : 5.76083 (-2.63267 10.3511)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.23 using 59 PHA bins.
# Reduced chi-squared = 0.9164 for 57 degrees of freedom
# Null hypothesis probability = 6.541584e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.309e-08 6.000e-09
25- 50 1.698e-08 8.785e-09
50-150 1.269e-08 9.487e-09
15-150 4.276e-08 2.283e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.30175 (-2.22487 2.43284)
R1^2/D10^2 : 40.8382 (-38.0323 86719.5)
kT2 [keV] : 16.8401 (-4.89353 18.1238)
R2^2/D10^2 : 3.83090E-02 (-0.0351822 0.466651)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.55 using 59 PHA bins.
# Reduced chi-squared = 0.9010 for 55 degrees of freedom
# Null hypothesis probability = 6.820054e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.574e-08 8.635e-09
25- 50 1.246e-08 7.155e-09
50-150 1.967e-08 1.376e-08
15-150 4.787e-08 2.636e-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: 2.23792 ( -0.319724 0.365738 )
Norm@50keV : 3.04935E-03 ( -0.000777621 0.000755673 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.07 using 59 PHA bins.
# Reduced chi-squared = 0.8434 for 57 degrees of freedom
# Null hypothesis probability = 7.941128e-01
Photon flux (15-150 keV) in 7.02 sec: 0.515113 ( -0.0944965 0.0945223 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.02399e-07 ( -4.33482e-08 4.49615e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.614526 ( -1.88346 1.37105 )
Epeak [keV] : 36.3976 ( )
Norm@50keV : 2.56220E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.77 using 59 PHA bins.
# Reduced chi-squared = 0.7816 for 56 degrees of freedom
# Null hypothesis probability = 8.825940e-01
Photon flux (15-150 keV) in 7.02 sec: 0.496251 ( -0.09515 0.095089 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.89256e-07 ( -4.04808e-08 4.37683e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.201056 ( -0.861128 2.57853 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 39.9673 ( -28.2491 13.9373 )
Norm@50keV : 3.93407E-02 ( -0.0391242 0.320051 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.10 using 59 PHA bins.
# Reduced chi-squared = 0.8018 for 55 degrees of freedom
# Null hypothesis probability = 8.536711e-01
Photon flux (15-150 keV) in 7.02 sec: 0.500040 ( 6.49996 -0.090227 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.88857e-07 ( -1.88808e-07 -3.97557e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 6.46e-08
S(50-100 keV) = 5.48e-08
T90 vs. Hardness ratio plot
T90 = 6.32400000095367 sec.
Hardness ratio (energy fluence ratio) = 0.848297
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.04531
Count Ratio (50-100 keV) / (15-25 keV) = 0.500066
Mask shadow pattern
IMX = -9.853890630636623E-01, IMY = 2.160253970975944E-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:
-239.136000 -1.144000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
268.3569 -1.4160 7.1 35.5 -112.4 0.6374 1.6 2.3 SW J1753.5-0127
270.3663 -25.0940 12.5 47.3 -144.1 0.4450 0.9 4.6 GX 5-1
270.4444 -25.9213 7.4 47.9 -144.9 -0.7519 -1.6 13.2 GRS 1758-258
274.0465 -14.0266 3.6 37.2 -135.6 1.0382 3.2 2.4 GX 17+2
275.8663 -30.4929 29.7 48.4 -153.8 -0.1744 -0.4 8.1 H1820-303
284.9065 -24.7494 0.0 39.3 -159.4 -0.3103 -1.0 12.5 HT1900.1-2455
288.7947 10.9411 1.2 12.9 -92.7 1.8939 9.7 0.3 GRS 1915+105
299.5868 35.2050 0.2 24.4 -8.7 9.9637 46.6 0.3 Cyg X-1
308.1666 40.9439 1.2 30.6 5.2 2.0985 9.7 2.6 Cyg X-3
326.1445 38.3161 19.8 35.0 30.1 0.1659 0.6 1.3 Cyg X-2
308.0793 37.6213 0.9 27.3 6.6 2.7204 13.3 ------ UNKNOWN
277.6361 58.2679 2.1 50.8 -20.3 2.5887 5.6 ------ UNKNOWN
257.9729 36.6173 3.3 47.1 -53.6 3.4566 3.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.144000 5.876000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
268.3289 -1.5247 8.9 35.6 -112.5 -0.0694 -1.3 4.9 SW J1753.5-0127
270.3487 -24.9942 7.5 47.3 -144.0 0.0978 1.5 6.2 GX 5-1
270.1683 -25.7184 6.0 47.9 -144.5 -0.1258 -1.9 7.4 GRS 1758-258
273.9862 -14.1713 23.4 37.3 -135.7 -0.0194 -0.5 8.2 GX 17+2
275.8672 -30.2561 7.9 48.2 -153.6 -0.0872 -1.5 7.3 H1820-303
285.0308 -25.0528 6.9 39.5 -159.8 -0.0595 -1.7 7.9 HT1900.1-2455
288.6415 10.8040 0.0 13.0 -93.3 0.0529 2.0 12.5 GRS 1915+105
299.4941 35.0552 9.1 24.3 -8.9 0.0320 1.3 10.0 Cyg X-1
308.2697 40.8640 5.3 30.5 5.4 -0.0676 -2.2 9.0 Cyg X-3
326.3614 38.4214 0.0 35.2 30.2 0.0457 1.1 10.7 Cyg X-2
308.1339 -44.8613 2.8 56.0 170.5 0.6081 4.0 ------ UNKNOWN
303.7701 32.2887 2.3 21.5 0.2 0.1343 5.0 ------ UNKNOWN
288.0424 -32.3839 1.4 45.3 -167.6 0.3728 8.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
Plot creation:
Sun May 31 09:05:24 EDT 2015