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
2.4796 47.7542 0.0070 29.1766 -7.2931 1.3623987 27.667 TRIG_00430603
Foreground time interval of the image:
-3.292 15.693 (delta_t = 18.985 [sec])
Background time interval of the image:
-169.107 -3.292 (delta_t = 165.815 [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 -3.292 sec. to 531.780 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81514 ( -0.101491 0.103218 )
Norm@50keV : 7.04408E-04 ( -4.33699e-05 4.29775e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.11 using 59 PHA bins.
# Reduced chi-squared = 1.125 for 57 degrees of freedom
# Null hypothesis probability = 2.414245e-01
Photon flux (15-150 keV) in 535.1 sec: 9.76416E-02 ( -0.00539995 0.00540577 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.46815e-06 ( -2.16287e-07 2.18611e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.292 sec. to 531.780 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39919 ( -0.454729 0.403883 )
Epeak [keV] : 64.6484 ( -14.898 373.965 )
Norm@50keV : 1.18818E-03 ( -0.000467261 0.000902126 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.08 using 59 PHA bins.
# Reduced chi-squared = 1.091 for 56 degrees of freedom
# Null hypothesis probability = 2.985141e-01
Photon flux (15-150 keV) in 535.1 sec: 9.54433E-02 ( -0.0057982 0.0057927 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.31756e-06 ( -2.59679e-07 2.62274e-07 ) ergs/cm2
Band function
Time interval is from -3.292 sec. to 531.780 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 7.08161E-02 ( -1.07366 0.525757 )
beta : -1.98955 ( 1.98719 0.173489 )
Epeak [keV] : 34.0804 ( -13.0171 35.2128 )
Norm@50keV : 1.25765E-02 ( -0.0124551 42.447 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.69 using 59 PHA bins.
# Reduced chi-squared = 1.067 for 55 degrees of freedom
# Null hypothesis probability = 3.418064e-01
Photon flux (15-150 keV) in 535.1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.34927e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.4030 ( )
R^2/D10^2 : 2.74055E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 125.58 using 59 PHA bins.
# Reduced chi-squared = 2.2032 for 57 degrees of freedom
# Null hypothesis probability = 4.520720e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.009e-07 3.847e-08
25- 50 1.186e-06 7.384e-08
50-150 8.951e-07 1.183e-07
15-150 2.482e-06 1.541e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 96.4446 (-18.317 26.2051)
Norm : 0.431938 (-0.0342174 0.0385469)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.12 using 59 PHA bins.
# Reduced chi-squared = 1.072 for 57 degrees of freedom
# Null hypothesis probability = 3.301816e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.040e-07 5.744e-08
25- 50 1.037e-06 6.261e-08
50-150 1.645e-06 5.140e-07
15-150 3.286e-06 5.370e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.62592 (-1.17929 1.27223)
R1^2/D10^2 : 0.142258 (-0.0557113 0.114064)
kT2 [keV] : 22.3145 (-4.60218 8.45231)
R2^2/D10^2 : 1.56235E-03 (-0.000958929 0.00200766)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.96 using 59 PHA bins.
# Reduced chi-squared = 1.108 for 55 degrees of freedom
# Null hypothesis probability = 2.703043e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.818e-07 1.733e-07
25- 50 1.029e-06 2.354e-07
50-150 1.603e-06 8.057e-07
15-150 3.213e-06 9.792e-07
Peak spectrum fit
Power-law model
Time interval is from -0.076 sec. to 0.924 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.985213 ( -0.233873 0.223695 )
Norm@50keV : 8.12828E-03 ( -0.00115956 0.001152 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.74 using 59 PHA bins.
# Reduced chi-squared = 1.171 for 57 degrees of freedom
# Null hypothesis probability = 1.770288e-01
Photon flux (15-150 keV) in 1 sec: 0.935252 ( -0.135254 0.135664 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.83738e-08 ( -1.2892e-08 1.29278e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.076 sec. to 0.924 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.304721 ( -1.41757 1.05711 )
Epeak [keV] : 104.048 ( -27.1875 183.132 )
Norm@50keV : 2.96051E-02 ( -0.0296051 0.0805384 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.20 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 56 degrees of freedom
# Null hypothesis probability = 2.651047e-01
Photon flux (15-150 keV) in 1 sec: 0.892942 ( -0.139957 0.140498 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.40841e-08 ( -1.38154e-08 1.37533e-08 ) ergs/cm2
Band function
Time interval is from -0.076 sec. to 0.924 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.305126 ( -1.00176 1.13706 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 104.023 ( -20.6836 183.386 )
Norm@50keV : 2.96187E-02 ( -0.0296187 0.0805762 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.20 using 59 PHA bins.
# Reduced chi-squared = 1.131 for 55 degrees of freedom
# Null hypothesis probability = 2.353726e-01
Photon flux (15-150 keV) in 1 sec: 0.903850 ( ) 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] : 21.7846 (-3.25307 4.14091)
R^2/D10^2 : 3.60733E-02 (-0.015464 0.0248859)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.98 using 59 PHA bins.
# Reduced chi-squared = 1.122 for 57 degrees of freedom
# Null hypothesis probability = 2.448486e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.182e-09 8.640e-10
25- 50 1.673e-08 3.850e-09
50-150 5.930e-08 1.408e-08
15-150 7.921e-08 1.568e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 3.85685 (-0.564484 0.564445)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.25 using 59 PHA bins.
# Reduced chi-squared = 1.443 for 57 degrees of freedom
# Null hypothesis probability = 1.595376e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.607e-09 5.495e-09
25- 50 1.848e-08 1.022e-08
50-150 4.053e-08 2.286e-08
15-150 6.861e-08 3.851e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.9895 (-11.1046 14.3665)
R1^2/D10^2 : 0.110138 (-0.101931 -0.101931)
kT2 [keV] : 28.2384 (-29.4908 -29.4908)
R2^2/D10^2 : 1.26782E-02 (-0.0104812 0.0379862)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.12 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 55 degrees of freedom
# Null hypothesis probability = 2.373262e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.419e-09 2.662e-09
25- 50 1.771e-08 1.018e-08
50-150 6.208e-08 3.407e-08
15-150 8.421e-08 4.275e-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: 1.16391 ( -0.0923623 0.091223 )
Norm@50keV : 4.72926E-03 ( -0.000263175 0.000263032 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.12 using 59 PHA bins.
# Reduced chi-squared = 1.388 for 57 degrees of freedom
# Null hypothesis probability = 2.791850e-02
Photon flux (15-150 keV) in 18.98 sec: 0.552464 ( -0.0320036 0.0320661 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.20219e-07 ( -5.44069e-08 5.45487e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.61483E-02 ( -0.484268 0.434201 )
Epeak [keV] : 96.4443 ( -13.6452 25.8368 )
Norm@50keV : 1.55880E-02 ( -0.00554517 0.00966251 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.66 using 59 PHA bins.
# Reduced chi-squared = 0.9939 for 56 degrees of freedom
# Null hypothesis probability = 4.877792e-01
Photon flux (15-150 keV) in 18.98 sec: 0.526173 ( -0.033455 0.033484 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.68777e-07 ( -5.85457e-08 5.86159e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.59641E-02 ( -0.369463 0.485047 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 96.4249 ( -9.33095 25.8534 )
Norm@50keV : 1.55920E-02 ( -0.00554583 0.00967218 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.66 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 55 degrees of freedom
# Null hypothesis probability = 4.498675e-01
Photon flux (15-150 keV) in 18.98 sec: 0.530358 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.68521e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 9.82e-07
S(50-100 keV) = 1.12e-06
T90 vs. Hardness ratio plot
T90 = 487.339999973774 sec.
Hardness ratio (energy fluence ratio) = 1.14053
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.2162
Count Ratio (50-100 keV) / (15-25 keV) = 0.742452
Mask shadow pattern
IMX = 5.538270890846754E-01, IMY = 7.087916796494229E-02
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:
-169.107380 -3.292000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.6646 35.3877 0.0 46.4 -172.8 0.8432 3.4 10.5 Her X-1
299.5937 35.1942 1.5 20.9 135.7 1.1223 7.6 0.5 Cyg X-1
308.1228 40.9147 1.8 12.6 124.4 0.8139 6.4 2.3 Cyg X-3
326.2042 38.3035 4.2 15.2 63.7 0.3468 2.7 1.9 Cyg X-2
320.2826 24.9312 2.7 27.2 85.9 0.7971 4.3 ------ UNKNOWN
310.1552 49.8206 2.3 4.8 157.7 0.6622 5.1 ------ UNKNOWN
29.5319 33.7078 2.2 53.8 -7.7 2.0997 5.2 ------ UNKNOWN
1.3153 64.2938 2.6 25.7 -42.9 0.6314 4.5 ------ UNKNOWN
225.5724 56.7755 3.5 49.3 -133.6 2.0748 3.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-3.292000 15.692610
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4431 35.3179 10.0 46.5 -172.8 0.0915 1.2 1.6 Her X-1
299.7138 35.3715 21.4 20.7 135.7 0.0269 0.5 11.9 Cyg X-1
307.9266 40.8893 8.7 12.7 125.0 0.0565 1.3 9.2 Cyg X-3
326.0015 38.4782 0.0 15.0 64.0 -0.0264 -0.6 12.3 Cyg X-2
2.4796 47.7542 0.4 29.2 -7.3 1.3625 27.7 ------ UNKNOWN
14.6587 47.9415 2.5 36.4 -14.5 0.2646 4.6 ------ UNKNOWN
240.3458 37.8724 2.4 53.3 -160.5 0.6074 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
68.692580 962.862000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.6183 35.3229 5.8 47.3 141.0 3.5650 2.0 7.4 Cyg X-1
308.0887 40.9851 2.9 38.6 142.8 3.6833 3.9 2.2 Cyg X-3
326.1622 38.1994 4.0 27.9 125.6 1.6862 2.9 7.3 Cyg X-2
20.2566 -2.9750 3.1 53.1 19.7 7.1540 3.8 ------ UNKNOWN
2.4526 47.7501 1.0 0.0 -165.9 4.6493 11.3 ------ UNKNOWN
36.8820 -0.8340 3.3 57.0 -0.2 7.2683 3.5 ------ UNKNOWN
32.1470 13.3000 3.1 42.4 -3.5 2.4713 3.7 ------ UNKNOWN
249.2513 61.0945 3.0 58.7 -169.2 10.6421 3.8 ------ UNKNOWN
47.0953 17.2145 2.8 47.5 -23.5 3.4666 4.0 ------ UNKNOWN
234.7349 66.9036 3.8 58.7 -159.2 12.8138 3.0 ------ UNKNOWN
143.3939 83.9614 2.9 47.1 -132.7 6.4749 4.0 ------ UNKNOWN
63.2494 33.4410 4.5 47.0 -53.3 5.6711 2.6 ------ UNKNOWN
Plot creation:
Sun May 31 00:17:44 EDT 2015