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
328.7615 29.1706 0.0219 27.7743 -35.1405 0.7010708 8.792 TRIG_00421962
Foreground time interval of the image:
0.304 30.284 (delta_t = 29.980 [sec])
Background time interval of the image:
-44.667 0.304 (delta_t = 44.971 [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 3.072000
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 3.072000
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 3.072000
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 0.304 sec. to 30.284 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98122 ( -0.242065 0.261079 )
Norm@50keV : 1.44507E-03 ( -0.000254833 0.000248075 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.11 using 59 PHA bins.
# Reduced chi-squared = 0.7738 for 57 degrees of freedom
# Null hypothesis probability = 8.941584e-01
Photon flux (15-150 keV) in 29.98 sec: 0.214909 ( -0.0290895 0.0290909 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.9916e-07 ( -6.56103e-08 6.7637e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.304 sec. to 30.284 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.914635 ( -1.35453 1.03623 )
Epeak [keV] : 42.5082 ( -25.1186 40.9887 )
Norm@50keV : 5.95164E-03 ( -0.0059515 0.0308757 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.99 using 59 PHA bins.
# Reduced chi-squared = 0.7320 for 56 degrees of freedom
# Null hypothesis probability = 9.338111e-01
Photon flux (15-150 keV) in 29.98 sec: 0.207656 ( -0.029694 0.029789 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.64494e-07 ( -6.66192e-08 7.3469e-08 ) ergs/cm2
Band function
Time interval is from 0.304 sec. to 30.284 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.916513 ( -0.641243 1.90914 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 42.5136 ( -24.7923 40.922 )
Norm@50keV : 5.93531E-03 ( -0.00593531 0.0309651 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.99 using 59 PHA bins.
# Reduced chi-squared = 0.7453 for 55 degrees of freedom
# Null hypothesis probability = 9.199252e-01
Photon flux (15-150 keV) in 29.98 sec: 0.209867 ( 6.79013 -0.032415 ) 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] : 10.2546 (-1.50206 1.7622)
R^2/D10^2 : 9.31084E-02 (-0.0421113 0.0764138)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.21 using 59 PHA bins.
# Reduced chi-squared = 0.8458 for 57 degrees of freedom
# Null hypothesis probability = 7.900431e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.027e-08 1.498e-08
25- 50 1.552e-07 2.764e-08
50-150 8.707e-08 3.167e-08
15-150 3.025e-07 5.441e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 66.5907 (-21.9335 41.2963)
Norm : 1.08645 (-0.211224 0.262569)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.36 using 59 PHA bins.
# Reduced chi-squared = 0.7256 for 57 degrees of freedom
# Null hypothesis probability = 9.407648e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.309e-08 1.550e-08
25- 50 1.304e-07 2.184e-08
50-150 1.613e-07 7.039e-08
15-150 3.747e-07 8.550e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.73032 (-3.44715 3.55048)
R1^2/D10^2 : 0.937824 (-0.783967 2536.83)
kT2 [keV] : 14.4767 (-4.09973 11.0935)
R2^2/D10^2 : 1.98049E-02 (-0.0183249 0.0633006)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.93 using 59 PHA bins.
# Reduced chi-squared = 0.7442 for 55 degrees of freedom
# Null hypothesis probability = 9.209416e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.067e-08 4.449e-08
25- 50 1.316e-07 6.780e-08
50-150 1.422e-07 8.462e-08
15-150 3.544e-07 1.838e-07
Peak spectrum fit
Power-law model
Time interval is from 6.208 sec. to 7.208 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.87630 ( -0.407094 0.455029 )
Norm@50keV : 4.68128E-03 ( -0.00139488 0.00133636 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.12 using 59 PHA bins.
# Reduced chi-squared = 0.8793 for 57 degrees of freedom
# Null hypothesis probability = 7.286934e-01
Photon flux (15-150 keV) in 1 sec: 0.665155 ( -0.156132 0.156133 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.30347e-08 ( -1.21846e-08 1.28061e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.208 sec. to 7.208 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.932495 ( -3.5128 1.22916 )
Epeak [keV] : 46.2103 ( )
Norm@50keV : 1.67826E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.31 using 59 PHA bins.
# Reduced chi-squared = 0.8805 for 56 degrees of freedom
# Null hypothesis probability = 7.244005e-01
Photon flux (15-150 keV) in 1 sec: 0.646058 ( -0.159535 0.159985 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.90141e-08 ( -1.29841e-08 1.47321e-08 ) ergs/cm2
Band function
Time interval is from 6.208 sec. to 7.208 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.50133 ( 1.01978 2.20262 )
beta : -2.52699 ( 8.50389 18.5039 )
Epeak [keV] : 34.2648 ( -46.9894 -46.9894 )
Norm@50keV : 0.721372 ( -0.66524 82.9382 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.63 using 59 PHA bins.
# Reduced chi-squared = 0.8843 for 55 degrees of freedom
# Null hypothesis probability = 7.149237e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.93935e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.68891 (-2.22774 3.26557)
R^2/D10^2 : 0.361044 (-0.241742 0.616136)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.27 using 59 PHA bins.
# Reduced chi-squared = 0.8995 for 57 degrees of freedom
# Null hypothesis probability = 6.888619e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.823e-09 3.383e-09
25- 50 1.621e-08 6.810e-09
50-150 7.716e-09 4.682e-09
15-150 3.075e-08 1.347e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 77.3940 (-39.6419 -77.394)
Norm : 3.18911 (-0.928465 1.44156)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.40 using 59 PHA bins.
# Reduced chi-squared = 0.8667 for 57 degrees of freedom
# Null hypothesis probability = 7.527024e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.256e-09 3.786e-09
25- 50 1.348e-08 5.846e-09
50-150 1.861e-08 1.556e-08
15-150 4.035e-08 2.614e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.43647 (-7.11537 3.57628)
R1^2/D10^2 : 0.761086 ( )
kT2 [keV] : 25.0525 (-24.6761 -24.6763)
R2^2/D10^2 : 5.60569E-03 (-0.00624548 0.350289)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.57 using 59 PHA bins.
#Fit statistic : Chi-Squared = 48.53 using 59 PHA bins.
# Reduced chi-squared = 0.8830 for 55 degrees of freedom
# Reduced chi-squared = 0.8824 for 55 degrees of freedom
# Null hypothesis probability = 7.173240e-01
# Null hypothesis probability = 7.184623e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.945e-09 4.854e-09
25- 50 1.444e-08 8.285e-09
50-150 1.800e-08 1.024e-08
15-150 4.038e-08 2.093e-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: 1.98122 ( -0.242065 0.261079 )
Norm@50keV : 1.44507E-03 ( -0.000254833 0.000248075 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.11 using 59 PHA bins.
# Reduced chi-squared = 0.7738 for 57 degrees of freedom
# Null hypothesis probability = 8.941584e-01
Photon flux (15-150 keV) in 29.98 sec: 0.214909 ( -0.0290895 0.0290909 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.9916e-07 ( -6.56103e-08 6.7637e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.914635 ( -1.35453 1.03623 )
Epeak [keV] : 42.5082 ( -25.1186 40.9887 )
Norm@50keV : 5.95164E-03 ( -0.0059515 0.0308757 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.99 using 59 PHA bins.
# Reduced chi-squared = 0.7320 for 56 degrees of freedom
# Null hypothesis probability = 9.338111e-01
Photon flux (15-150 keV) in 29.98 sec: 0.207656 ( -0.029694 0.029789 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.64494e-07 ( -6.66192e-08 7.3469e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.916512 ( -0.641247 3.48596 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 42.5136 ( -24.9992 40.9369 )
Norm@50keV : 5.93532E-03 ( -0.00593531 0.0309651 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.99 using 59 PHA bins.
# Reduced chi-squared = 0.7453 for 55 degrees of freedom
# Null hypothesis probability = 9.199252e-01
Photon flux (15-150 keV) in 29.98 sec: 0.209867 ( 6.79013 -0.032415 ) 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) = 1.19e-07
S(50-100 keV) = 1.21e-07
T90 vs. Hardness ratio plot
T90 = 23.0159999132156 sec.
Hardness ratio (energy fluence ratio) = 1.01681
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.22497
Count Ratio (50-100 keV) / (15-25 keV) = 0.731339
Mask shadow pattern
IMX = 4.306790018847859E-01, IMY = 3.031407496949320E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 3.072000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 3.072000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 3.072000
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:
-44.667400 0.304000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5689 35.1995 4.0 34.5 129.3 0.3698 2.9 10.2 Her X-1
288.8838 10.9817 5.4 32.4 54.0 0.2438 2.1 5.5 GRS 1915+105
299.5822 35.2001 0.5 7.2 28.4 1.6041 22.3 0.4 Cyg X-1
308.0353 40.9152 4.0 7.4 -45.5 0.2194 2.9 4.1 Cyg X-3
326.0786 38.4443 72.3 21.4 -52.3 -0.0119 -0.2 8.6 Cyg X-2
312.9026 -3.9205 2.6 48.1 16.8 0.8129 4.4 ------ UNKNOWN
344.2541 14.4666 2.8 48.2 -32.4 0.7153 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.304000 30.284000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4896 35.2062 4.9 34.5 129.4 -0.3108 -2.3 8.3 Her X-1
288.8201 11.1245 6.3 32.3 54.1 -0.2198 -1.8 10.8 GRS 1915+105
299.6142 35.2450 5.6 7.2 28.1 -0.1417 -2.0 2.9 Cyg X-1
308.3789 40.8977 0.0 7.6 -45.9 -0.0431 -0.6 12.6 Cyg X-3
326.2245 38.4898 9.7 21.5 -52.6 0.0935 1.2 10.4 Cyg X-2
328.7614 29.1706 1.3 27.8 -35.1 0.7009 8.8 ------ UNKNOWN
246.1119 81.7751 2.3 43.0 -153.1 0.5883 5.0 ------ UNKNOWN
172.8428 79.6703 2.4 54.1 -153.9 1.1896 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
90.132610 962.106200
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5835 35.2019 0.3 25.4 124.8 30.5739 43.8 0.3 Cyg X-1
308.0831 40.9854 2.2 20.6 144.1 3.3146 5.4 2.3 Cyg X-3
326.1159 38.4042 3.8 9.5 -179.4 1.6974 3.0 5.6 Cyg X-2
309.6194 -8.8503 2.6 42.3 42.4 6.2042 4.5 ------ UNKNOWN
359.3267 36.3645 3.1 26.5 -100.2 2.4990 3.7 ------ UNKNOWN
0.8967 50.8821 3.4 32.3 -127.7 2.6788 3.4 ------ UNKNOWN
18.9773 41.3452 3.2 42.1 -107.2 10.4706 3.6 ------ UNKNOWN
Plot creation:
Sun May 31 01:34:01 EDT 2015