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
261.6370 -23.4262 0.0037 24.0818 98.6174 7.6999045 51.400 TRIG_00453628
Foreground time interval of the image:
-4.148 37.760 (delta_t = 41.908 [sec])
Background time interval of the image:
-239.680 -4.148 (delta_t = 235.532 [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)
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 -4.148 sec. to 37.760 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.08813 ( -0.0623051 0.0629512 )
Norm@50keV : 1.02074E-02 ( -0.000344844 0.000343109 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.69 using 59 PHA bins.
# Reduced chi-squared = 0.8718 for 57 degrees of freedom
# Null hypothesis probability = 7.430047e-01
Photon flux (15-150 keV) in 41.91 sec: 1.59654 ( -0.0542925 0.0545565 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.97018e-06 ( -1.25259e-07 1.25519e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.148 sec. to 37.760 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79834 ( -0.265586 0.216942 )
Epeak [keV] : 32.3760 ( )
Norm@50keV : 1.44520E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.71 using 59 PHA bins.
# Reduced chi-squared = 0.8163 for 56 degrees of freedom
# Null hypothesis probability = 8.351940e-01
Photon flux (15-150 keV) in 41.91 sec: 1.55889 ( -0.0314 0.06256 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.85935e-06 ( -1.56383e-07 1.56077e-07 ) ergs/cm2
Band function
Time interval is from -4.148 sec. to 37.760 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.128669 ( -1.92092 3.28382 )
beta : -2.18642 ( -0.164043 0.0891 )
Epeak [keV] : 28.0593 ( -4.13257 9.40065 )
Norm@50keV : 0.327239 ( -0.325145 147.262 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.90 using 59 PHA bins.
# Reduced chi-squared = 0.7437 for 55 degrees of freedom
# Null hypothesis probability = 9.214687e-01
Photon flux (15-150 keV) in 41.91 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.84062e-06 ( -3.84033e-06 -1.44958e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.9491 ( )
R^2/D10^2 : 0.474910 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 263.42 using 59 PHA bins.
# Reduced chi-squared = 4.6214 for 57 degrees of freedom
# Null hypothesis probability = 2.696037e-28
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.981e-07 2.850e-08
25- 50 1.400e-06 5.029e-08
50-150 9.447e-07 7.397e-08
15-150 2.843e-06 9.367e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 66.0739 (-6.13017 7.12998)
Norm : 7.69465 (-0.452565 0.486869)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.81 using 59 PHA bins.
# Reduced chi-squared = 0.9440 for 57 degrees of freedom
# Null hypothesis probability = 5.955845e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.218e-07 4.128e-08
25- 50 1.287e-06 4.317e-08
50-150 1.582e-06 1.067e-07
15-150 3.691e-06 1.245e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.55611 (-0.606571 0.622778)
R1^2/D10^2 : 2.67484 (-0.751735 1.17374)
kT2 [keV] : 22.4015 (-2.76523 3.72197)
R2^2/D10^2 : 2.03786E-02 (-0.00916453 0.0144998)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.05 using 59 PHA bins.
# Reduced chi-squared = 0.8737 for 55 degrees of freedom
# Null hypothesis probability = 7.350147e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.981e-07 7.313e-08
25- 50 1.285e-06 8.089e-08
50-150 1.689e-06 2.393e-07
15-150 3.772e-06 3.382e-07
Peak spectrum fit
Power-law model
Time interval is from 2.348 sec. to 3.348 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.93051 ( -0.114063 0.117274 )
Norm@50keV : 3.15897E-02 ( -0.00240885 0.00238251 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.82 using 59 PHA bins.
# Reduced chi-squared = 1.313 for 57 degrees of freedom
# Null hypothesis probability = 5.678196e-02
Photon flux (15-150 keV) in 1 sec: 4.59330 ( -0.307223 0.307462 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.90561e-07 ( -2.15853e-08 2.17457e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.348 sec. to 3.348 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17116 ( -0.551009 0.482084 )
Epeak [keV] : 48.3888 ( -8.27414 14.3984 )
Norm@50keV : 8.33104E-02 ( -0.0376911 0.0845837 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.07 using 59 PHA bins.
# Reduced chi-squared = 1.198 for 56 degrees of freedom
# Null hypothesis probability = 1.478306e-01
Photon flux (15-150 keV) in 1 sec: 4.46922 ( -0.31697 0.31688 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.74079e-07 ( -2.3768e-08 2.4029e-08 ) ergs/cm2
Band function
Time interval is from 2.348 sec. to 3.348 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.17136 ( -0.480093 0.526348 )
beta : -9.36345 ( 9.37165 19.3716 )
Epeak [keV] : 48.5315 ( -8.07109 14.2014 )
Norm@50keV : 8.31084E-02 ( -0.035713 0.013321 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.07 using 59 PHA bins.
# Reduced chi-squared = 1.219 for 55 degrees of freedom
# Null hypothesis probability = 1.275149e-01
Photon flux (15-150 keV) in 1 sec: 4.46982 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.76653e-07 ( -2.76646e-07 -2.3519e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.8498 (-0.828808 0.89918)
R^2/D10^2 : 1.58811 (-0.415941 0.561089)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 106.27 using 59 PHA bins.
# Reduced chi-squared = 1.8644 for 57 degrees of freedom
# Null hypothesis probability = 8.204552e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.895e-08 4.630e-09
25- 50 1.082e-07 8.065e-09
50-150 7.118e-08 1.204e-08
15-150 2.183e-07 1.725e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 77.0888 (-14.3303 19.7783)
Norm : 21.9231 (-2.1834 2.465)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.17 using 59 PHA bins.
# Reduced chi-squared = 1.178 for 57 degrees of freedom
# Null hypothesis probability = 1.677823e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.674e-08 5.235e-09
25- 50 9.256e-08 6.150e-09
50-150 1.274e-07 1.910e-08
15-150 2.767e-07 2.355e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.48007 (-1.435 1.5258)
R1^2/D10^2 : 7.57542 (-3.71698 9.47995)
kT2 [keV] : 20.1837 (-4.43062 8.32644)
R2^2/D10^2 : 9.97905E-02 (-0.0749807 0.192176)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.84 using 59 PHA bins.
# Reduced chi-squared = 1.215 for 55 degrees of freedom
# Null hypothesis probability = 1.314844e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.464e-08 1.232e-08
25- 50 9.409e-08 1.916e-08
50-150 1.252e-07 5.519e-08
15-150 2.739e-07 7.240e-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: 2.08813 ( -0.0623051 0.0629512 )
Norm@50keV : 1.02074E-02 ( -0.000344844 0.000343109 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.69 using 59 PHA bins.
# Reduced chi-squared = 0.8718 for 57 degrees of freedom
# Null hypothesis probability = 7.430047e-01
Photon flux (15-150 keV) in 41.91 sec: 1.59654 ( -0.0542925 0.0545565 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.97018e-06 ( -1.25259e-07 1.25519e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79834 ( -0.265586 0.216942 )
Epeak [keV] : 32.3760 ( )
Norm@50keV : 1.44520E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.71 using 59 PHA bins.
# Reduced chi-squared = 0.8163 for 56 degrees of freedom
# Null hypothesis probability = 8.351940e-01
Photon flux (15-150 keV) in 41.91 sec: 1.55889 ( -0.0314 0.06256 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.85935e-06 ( -1.56383e-07 1.56077e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.128669 ( -1.92092 3.28382 )
beta : -2.18642 ( -0.164043 0.0891 )
Epeak [keV] : 28.0593 ( -4.13257 9.40065 )
Norm@50keV : 0.327239 ( -0.325145 147.262 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.90 using 59 PHA bins.
# Reduced chi-squared = 0.7437 for 55 degrees of freedom
# Null hypothesis probability = 9.214687e-01
Photon flux (15-150 keV) in 41.91 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.84062e-06 ( -3.84033e-06 -1.44958e-07 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.22e-06
S(50-100 keV) = 1.15e-06
T90 vs. Hardness ratio plot
T90 = 27.1839999556541 sec.
Hardness ratio (energy fluence ratio) = 0.942623
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.08869
Count Ratio (50-100 keV) / (15-25 keV) = 0.512877
Mask shadow pattern
IMX = -6.696747458899358E-02, IMY = -4.418953155461618E-01
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:
-239.680000 -4.148000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
255.7369 -37.8593 0.0 22.4 59.4 -0.3459 -1.3 11.9 4U 1700-377
256.4161 -36.4693 3.4 22.1 63.3 0.9056 3.4 2.9 GX 349+2
262.9761 -24.5623 19.7 22.4 98.5 0.1776 0.6 11.1 GX 1+4
264.9476 -44.4238 7.7 15.8 37.7 0.3328 1.5 8.9 4U 1735-44
268.3674 -1.4542 23.2 39.2 132.7 0.3110 0.5 0.1 SW J1753.5-0127
270.2682 -25.0668 3.9 17.4 111.5 0.7380 3.0 1.1 GX 5-1
270.1250 -25.7214 7.3 17.0 109.8 0.4065 1.6 9.7 GRS 1758-258
274.0063 -14.0343 39.5 25.5 134.7 0.0790 0.3 0.1 GX 17+2
276.0105 -30.3571 4.9 10.1 113.9 0.5178 2.4 4.5 H1820-303
285.1118 -24.7866 8.1 13.1 161.9 0.3339 1.4 9.0 HT1900.1-2455
288.6712 10.9311 3.8 49.0 164.0 1.9959 3.0 7.5 GRS 1915+105
262.8539 -33.9311 65.2 17.7 74.6 -0.0469 -0.2 8.9 GX 354-0
241.2671 -59.0157 3.3 34.5 16.4 1.0342 3.5 ------ UNKNOWN
161.5882 -88.7304 2.7 52.8 -20.5 2.7155 4.2 ------ UNKNOWN
346.2484 -83.3922 2.2 49.3 -29.5 2.6051 5.3 ------ UNKNOWN
339.0685 -45.0037 2.6 41.0 -83.8 6.1994 4.5 ------ UNKNOWN
333.7732 -26.4437 4.2 43.0 -112.2 3.6249 2.7 ------ UNKNOWN
330.1352 -8.2026 3.0 50.9 -135.4 5.8785 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-4.148000 37.760000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
256.0732 -37.7156 4.2 22.1 59.9 -0.3696 -2.7 8.7 4U 1700-377
256.6766 -36.4029 10.6 21.9 63.6 0.1527 1.1 11.7 GX 349+2
263.0295 -24.6090 13.5 22.3 98.5 -0.1211 -0.9 8.3 GX 1+4
265.0240 -44.4121 0.0 15.8 37.7 -0.2627 -2.4 12.3 4U 1735-44
268.3965 -1.4784 5.1 39.2 132.7 0.5975 2.3 2.3 SW J1753.5-0127
270.1971 -25.1294 14.3 17.4 111.2 -0.0961 -0.8 5.6 GX 5-1
270.3244 -25.8612 4.9 16.8 109.9 -0.2751 -2.4 7.2 GRS 1758-258
274.1575 -13.9515 3.7 25.5 135.1 0.4433 3.1 10.2 GX 17+2
276.1578 -30.3005 0.0 10.1 114.6 0.0175 0.2 12.7 H1820-303
285.0449 -24.9215 31.5 13.0 161.7 -0.0368 -0.4 0.5 HT1900.1-2455
288.9096 11.0679 23.0 49.2 164.3 0.1637 0.5 9.8 GRS 1915+105
263.0445 -33.9162 31.8 17.5 74.9 -0.0476 -0.4 5.6 GX 354-0
255.4561 -8.9650 1.7 38.8 108.9 2.4865 6.7 ------ UNKNOWN
261.6370 -23.4262 0.2 24.1 98.6 7.6992 51.1 ------ UNKNOWN
197.0454 -75.2655 2.2 52.8 -3.2 1.5754 5.1 ------ UNKNOWN
2.5407 -72.1826 2.5 50.7 -44.6 1.9961 4.6 ------ UNKNOWN
351.8269 -65.7016 2.4 46.9 -53.2 1.7160 4.8 ------ UNKNOWN
334.5148 -30.0963 2.4 41.9 -107.0 1.6699 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
224.820590 962.415100
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
34.5808 -56.8957 3.4 45.8 38.1 4.5865 3.3 ------ UNKNOWN
51.7303 -30.2509 3.1 34.9 -4.7 2.0104 3.7 ------ UNKNOWN
73.7304 -25.9709 3.4 52.8 -17.1 3.5536 3.4 ------ UNKNOWN
70.0275 -22.3136 3.3 49.3 -21.5 3.1829 3.5 ------ UNKNOWN
78.7984 -18.4159 4.4 57.5 -26.3 7.3742 2.6 ------ UNKNOWN
2.8954 40.5360 4.8 55.3 -145.2 8.3914 2.5 ------ UNKNOWN
69.8453 -4.6791 3.9 50.7 -44.5 6.9282 3.0 ------ UNKNOWN
33.0565 28.2731 3.2 43.1 -112.2 8.1569 3.6 ------ UNKNOWN
Plot creation:
Sat May 30 22:18:37 EDT 2015