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
275.7252 -59.4390 0.0181 40.4914 4.1902 2.1358034 10.637 TRIG_00533060
Foreground time interval of the image:
-31.460 23.037 (delta_t = 54.497 [sec])
Background time interval of the image:
-60.864 -31.460 (delta_t = 29.404 [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 1.408000
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 1.408000
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 1.408000
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 -31.460 sec. to 566.708 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36879 ( -0.10073 0.100446 )
Norm@50keV : 1.28883E-03 ( -6.99931e-05 6.9938e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.11 using 59 PHA bins.
# Reduced chi-squared = 0.8441 for 57 degrees of freedom
# Null hypothesis probability = 7.929164e-01
Photon flux (15-150 keV) in 598.2 sec: 0.155880 ( -0.00880988 0.00883635 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.49886e-06 ( -4.50514e-07 4.52832e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -31.460 sec. to 566.708 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28139 ( -0.395732 0.134999 )
Epeak [keV] : 416.214 ( -442.485 -442.485 )
Norm@50keV : 1.41986E-03 ( -0.000188263 0.000749425 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.98 using 59 PHA bins.
# Reduced chi-squared = 0.8567 for 56 degrees of freedom
# Null hypothesis probability = 7.684561e-01
Photon flux (15-150 keV) in 598.2 sec: 0.155099 ( -0.009398 0.009314 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.45261e-06 ( -5.02727e-07 4.86995e-07 ) ergs/cm2
Band function
Time interval is from -31.460 sec. to 566.708 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97409 ( -4.97409 -4.97409 )
beta : -1.38876 ( -0.105944 0.104753 )
Epeak [keV] : 21.6051 ( -21.6051 5.11053 )
Norm@50keV : 280.413 ( -15.1533 420976 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.25 using 59 PHA bins.
# Reduced chi-squared = 0.8591 for 55 degrees of freedom
# Null hypothesis probability = 7.618476e-01
Photon flux (15-150 keV) in 598.2 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] : 16.9408 ( )
R^2/D10^2 : 1.16067E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 122.50 using 59 PHA bins.
# Reduced chi-squared = 2.1491 for 57 degrees of freedom
# Null hypothesis probability = 1.086180e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.062e-07 4.301e-08
25- 50 1.792e-06 1.349e-07
50-150 3.668e-06 3.766e-07
15-150 5.867e-06 3.963e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 0.645738 (-0.0351192 0.0351145)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.58 using 59 PHA bins.
# Reduced chi-squared = 1.028 for 57 degrees of freedom
# Null hypothesis probability = 4.171827e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.621e-07 5.563e-08
25- 50 1.851e-06 1.229e-07
50-150 4.059e-06 7.190e-07
15-150 6.872e-06 7.618e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.42602 (-1.50449 1.7859)
R1^2/D10^2 : 0.122893 (-0.06049 0.144851)
kT2 [keV] : 29.9921 (-5.60713 10.9189)
R2^2/D10^2 : 1.40387E-03 (-0.000884919 0.00148499)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.40 using 59 PHA bins.
# Reduced chi-squared = 0.9164 for 55 degrees of freedom
# Null hypothesis probability = 6.506044e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.078e-07 1.653e-07
25- 50 1.785e-06 3.194e-07
50-150 4.849e-06 1.304e-06
15-150 7.442e-06 1.580e-06
Peak spectrum fit
Power-law model
Time interval is from 0.900 sec. to 1.900 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01501 ( -0.241091 0.232382 )
Norm@50keV : 1.56945E-02 ( -0.00222654 0.00221698 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.93 using 59 PHA bins.
# Reduced chi-squared = 0.8760 for 57 degrees of freedom
# Null hypothesis probability = 7.350502e-01
Photon flux (15-150 keV) in 1 sec: 1.80846 ( -0.261117 0.262107 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.68836e-07 ( -2.52065e-08 2.53626e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.900 sec. to 1.900 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.411099 ( -1.67863 1.18398 )
Epeak [keV] : 97.7578 ( -24.2854 173.856 )
Norm@50keV : 6.52069E-02 ( -0.0652133 0.235029 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.51 using 59 PHA bins.
# Reduced chi-squared = 0.8126 for 56 degrees of freedom
# Null hypothesis probability = 8.406271e-01
Photon flux (15-150 keV) in 1 sec: 1.69589 ( -0.28168 0.28042 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.57594e-07 ( -2.744e-08 2.7627e-08 ) ergs/cm2
Band function
Time interval is from 0.900 sec. to 1.900 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.410905 ( -1.00136 0.800808 )
beta : -10.00000 ( 10 4.99144e-08 )
Epeak [keV] : 97.7475 ( -18.7577 173.478 )
Norm@50keV : 6.52068E-02 ( -0.0652068 0.235869 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.51 using 59 PHA bins.
# Reduced chi-squared = 0.8274 for 55 degrees of freedom
# Null hypothesis probability = 8.155347e-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] : 21.2301 (-3.11972 3.97754)
R^2/D10^2 : 7.44390E-02 (-0.0315507 0.0502605)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.45 using 59 PHA bins.
# Reduced chi-squared = 0.8150 for 57 degrees of freedom
# Null hypothesis probability = 8.396078e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.309e-09 1.733e-09
25- 50 3.265e-08 7.940e-09
50-150 1.098e-07 2.971e-08
15-150 1.487e-07 3.005e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 7.44484 (-1.08657 1.0865)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.72 using 59 PHA bins.
# Reduced chi-squared = 1.100 for 57 degrees of freedom
# Null hypothesis probability = 2.805731e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.853e-08 1.050e-08
25- 50 3.565e-08 2.001e-08
50-150 7.818e-08 4.418e-08
15-150 1.324e-07 7.450e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.37382 (-4.23418 -4.23418)
R1^2/D10^2 : 3.52673 (-3.6258 -3.6258)
kT2 [keV] : 22.7806 (-3.83819 -22.735)
R2^2/D10^2 : 5.73745E-02 (-0.0574953 0.0468436)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.67 using 59 PHA bins.
# Reduced chi-squared = 0.8122 for 55 degrees of freedom
# Null hypothesis probability = 8.387706e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.029e-08 5.005e-09
25- 50 3.150e-08 1.140e-08
50-150 1.135e-07 4.303e-08
15-150 1.553e-07 4.992e-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: 1.27150 ( -0.0922941 0.0920012 )
Norm@50keV : 5.58119E-03 ( -0.000291306 0.000291295 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.87 using 59 PHA bins.
# Reduced chi-squared = 0.8574 for 57 degrees of freedom
# Null hypothesis probability = 7.696032e-01
Photon flux (15-150 keV) in 54.5 sec: 0.662480 ( -0.0358476 0.0359064 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.02726e-06 ( -1.74456e-07 1.75197e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.621485 ( -0.432412 0.39286 )
Epeak [keV] : 114.805 ( -25.8577 88.6801 )
Norm@50keV : 1.12264E-02 ( -0.00378539 0.00636496 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.44 using 59 PHA bins.
# Reduced chi-squared = 0.7222 for 56 degrees of freedom
# Null hypothesis probability = 9.416882e-01
Photon flux (15-150 keV) in 54.5 sec: 0.640295 ( -0.038151 0.038155 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.90356e-06 ( -1.92227e-07 1.9196e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.621443 ( -0.291649 0.426877 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 114.786 ( -18.0859 88.5561 )
Norm@50keV : 1.12266E-02 ( -0.00378478 0.00636806 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.44 using 59 PHA bins.
# Reduced chi-squared = 0.7353 for 55 degrees of freedom
# Null hypothesis probability = 9.290393e-01
Photon flux (15-150 keV) in 54.5 sec: 0.645080 ( ) 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) = 1.73e-06
S(50-100 keV) = 2.68e-06
T90 vs. Hardness ratio plot
T90 = 220.595999956131 sec.
Hardness ratio (energy fluence ratio) = 1.54913
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.34616
Count Ratio (50-100 keV) / (15-25 keV) = 1.23646
Mask shadow pattern
IMX = 8.515402123272447E-01, IMY = -6.238669160080063E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.408000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.408000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.408000
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:
-60.864000 -31.460000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.0549 -60.5389 2456.5 40.8 -71.3 -0.0006 -0.0 9.2 Cen X-3
186.9783 -62.7919 26.9 40.7 -58.5 0.0513 0.4 8.9 GX 301-2
264.7704 -44.4074 5.0 56.8 1.1 0.6370 2.3 2.8 4U 1735-44
275.7364 -59.4338 0.6 40.5 4.2 1.3449 17.7 ------ UNKNOWN
101.7010 -29.1276 2.9 55.1 -145.1 1.0798 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-31.460000 23.036600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.2582 -60.5920 16.9 40.8 -71.1 0.2754 0.7 2.5 Cen X-3
186.6956 -62.6996 6.5 40.7 -58.7 0.6117 1.8 4.4 GX 301-2
264.6946 -44.4251 10.2 56.8 1.0 -0.8679 -1.1 2.6 4U 1735-44
275.7300 -59.4379 1.1 40.5 4.2 2.1896 10.9 ------ UNKNOWN
209.9058 -58.2303 2.7 46.6 -43.2 1.5507 4.3 ------ UNKNOWN
139.2037 -53.8083 2.9 41.3 -98.5 2.1410 3.9 ------ UNKNOWN
123.0414 -46.3574 2.4 44.3 -116.8 2.8270 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
82.636600 135.636600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.5460 -60.7321 0.0 46.7 -126.5 0.3331 0.9 9.4 Cen X-3
186.5940 -62.8420 9.9 39.7 -121.3 -0.2379 -1.2 4.6 GX 301-2
245.0246 -15.6568 2.3 49.2 -27.4 1.0542 5.0 2.8 Sco X-1
256.0839 -37.7542 2.7 25.0 -25.8 0.3621 4.2 7.1 4U 1700-377
256.4337 -36.3695 4.7 26.2 -23.9 0.2141 2.4 3.2 GX 349+2
263.1372 -24.6192 9.1 35.9 -6.7 -0.1480 -1.3 10.3 GX 1+4
264.9131 -44.5477 6.4 16.2 -15.4 0.1564 1.8 9.3 4U 1735-44
270.4423 -25.1987 6.2 34.4 4.6 -0.2241 -1.9 11.2 GX 5-1
270.4680 -25.8669 4.7 33.7 4.6 0.2851 2.4 11.6 GRS 1758-258
274.0776 -14.1613 5.4 45.3 10.8 0.3878 2.2 8.6 GX 17+2
275.8827 -30.2830 3.2 29.1 13.4 0.3816 3.5 5.5 H1820-303
285.2140 -25.0264 10.2 35.0 28.2 0.1475 1.1 11.6 HT1900.1-2455
262.8491 -33.7190 4.8 27.1 -10.9 0.2256 2.4 9.8 GX 354-0
271.3724 -21.2759 2.6 38.3 6.5 0.5635 4.4 ------ UNKNOWN
275.7560 -59.4912 1.3 0.1 168.8 0.7153 8.9 ------ UNKNOWN
Plot creation:
Sat May 30 18:33:33 EDT 2015