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
348.9437 -44.6526 0.0119 32.9996 118.9281 1.4749042 16.198 TRIG_00576562
Foreground time interval of the image:
-8.284 10.252 (delta_t = 18.536 [sec])
Background time interval of the image:
-400.923 -384.995 (delta_t = 15.928 [sec])
-239.024 -8.284 (delta_t = 230.740 [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 -8.284 sec. to 10.252 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79340 ( -0.172926 0.178148 )
Norm@50keV : 4.75783E-03 ( -0.000540978 0.000532156 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.45 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 57 degrees of freedom
# Null hypothesis probability = 2.887210e-01
Photon flux (15-150 keV) in 18.54 sec: 0.653950 ( -0.0647882 0.0648168 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.12263e-07 ( -9.35176e-08 9.49834e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.284 sec. to 10.252 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34182 ( -0.766291 0.548495 )
Epeak [keV] : 63.4081 ( -20.2691 -63.4081 )
Norm@50keV : 8.55919E-03 ( -0.00413537 0.0145769 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.02 using 59 PHA bins.
# Reduced chi-squared = 1.090 for 56 degrees of freedom
# Null hypothesis probability = 3.002184e-01
Photon flux (15-150 keV) in 18.54 sec: 0.643102 ( -0.066595 0.066556 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.75413e-07 ( -1.06559e-07 1.08225e-07 ) ergs/cm2
Band function
Time interval is from -8.284 sec. to 10.252 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.34157 ( -0.431996 0.822601 )
beta : -10.0000 ( 10 3.01981e-14 )
Epeak [keV] : 63.3909 ( -20.2304 -63.391 )
Norm@50keV : 8.56045E-03 ( -0.00397646 0.0145546 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.02 using 59 PHA bins.
# Reduced chi-squared = 1.110 for 55 degrees of freedom
# Null hypothesis probability = 2.684019e-01
Photon flux (15-150 keV) in 18.54 sec: 0.646015 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.87878e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.8920 (-1.30946 1.53197)
R^2/D10^2 : 0.223618 (-0.0870533 0.138973)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.59 using 59 PHA bins.
# Reduced chi-squared = 1.466 for 57 degrees of freedom
# Null hypothesis probability = 1.244269e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.026e-07 1.748e-08
25- 50 2.863e-07 3.337e-08
50-150 1.904e-07 4.894e-08
15-150 5.793e-07 7.388e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 97.3455 (-29.5108 56.0276)
Norm : 2.91699 (-0.386995 0.47027)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.97 using 59 PHA bins.
# Reduced chi-squared = 1.070 for 57 degrees of freedom
# Null hypothesis probability = 3.350913e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.413e-07 2.060e-08
25- 50 2.430e-07 2.837e-08
50-150 3.878e-07 1.556e-07
15-150 7.722e-07 1.831e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.51647 (-1.47112 1.67726)
R1^2/D10^2 : 1.10698 (-0.600378 0.961387)
kT2 [keV] : 24.1337 (-6.88622 15.0703)
R2^2/D10^2 : 8.37390E-03 (-0.00677348 0.0125376)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.24 using 59 PHA bins.
# Reduced chi-squared = 1.059 for 55 degrees of freedom
# Null hypothesis probability = 3.571919e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.452e-07 5.831e-08
25- 50 2.425e-07 7.912e-08
50-150 4.060e-07 2.136e-07
15-150 7.937e-07 3.121e-07
Peak spectrum fit
Power-law model
Time interval is from 0.612 sec. to 1.612 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37038 ( -0.280304 0.278361 )
Norm@50keV : 1.29038E-02 ( -0.00234617 0.00234094 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.25 using 59 PHA bins.
# Reduced chi-squared = 1.022 for 57 degrees of freedom
# Null hypothesis probability = 4.292044e-01
Photon flux (15-150 keV) in 1 sec: 1.56123 ( -0.28663 0.287263 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25462e-07 ( -2.46588e-08 2.49656e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.612 sec. to 1.612 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.209057 ( -1.62027 1.15449 )
Epeak [keV] : 74.8103 ( -22.6204 678.07 )
Norm@50keV : 5.22202E-02 ( -0.0522047 0.31928 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.29 using 59 PHA bins.
# Reduced chi-squared = 0.9873 for 56 degrees of freedom
# Null hypothesis probability = 5.017364e-01
Photon flux (15-150 keV) in 1 sec: 1.52130 ( -0.28959 0.29036 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16171e-07 ( -2.68294e-08 2.7227e-08 ) ergs/cm2
Band function
Time interval is from 0.612 sec. to 1.612 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5.88875 -5 )
beta : -1.74540 ( -0.605447 0.392473 )
Epeak [keV] : 32.0699 ( -7.8916 7.93483 )
Norm@50keV : 312.239 ( -54.3919 1357.43 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.42 using 59 PHA bins.
# Reduced chi-squared = 0.9531 for 55 degrees of freedom
# Null hypothesis probability = 5.737803e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21116e-07 ( -1.21109e-07 -2.52566e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.9468 (-2.87372 3.79829)
R^2/D10^2 : 0.194238 (-0.106706 0.216116)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.46 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 57 degrees of freedom
# Null hypothesis probability = 4.216195e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.090e-09 3.423e-09
25- 50 3.600e-08 1.173e-08
50-150 5.465e-08 2.067e-08
15-150 9.974e-08 2.722e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-83.4186 -199.363)
Norm : 6.52244 (-1.17288 1.17288)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.92 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 57 degrees of freedom
# Null hypothesis probability = 4.410567e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.624e-08 9.445e-09
25- 50 3.124e-08 1.809e-08
50-150 6.852e-08 3.888e-08
15-150 1.160e-07 6.645e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.28948 (-4.1431 5.42944)
R1^2/D10^2 : 0.651142 (-0.46232 0.984344)
kT2 [keV] : 29.1896 (-24.0524 -29.1958)
R2^2/D10^2 : 1.24439E-02 (-0.0119817 0.118559)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.90 using 59 PHA bins.
# Reduced chi-squared = 0.9799 for 55 degrees of freedom
# Null hypothesis probability = 5.168698e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.280e-08 7.670e-09
25- 50 3.508e-08 1.932e-08
50-150 7.295e-08 3.945e-08
15-150 1.208e-07 6.085e-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: 1.79340 ( -0.172926 0.178148 )
Norm@50keV : 4.75783E-03 ( -0.000540978 0.000532156 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.45 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 57 degrees of freedom
# Null hypothesis probability = 2.887210e-01
Photon flux (15-150 keV) in 18.54 sec: 0.653950 ( -0.0647882 0.0648168 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.12263e-07 ( -9.35176e-08 9.49834e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34182 ( -0.766291 0.548495 )
Epeak [keV] : 63.4081 ( -20.2691 -63.4081 )
Norm@50keV : 8.55919E-03 ( -0.00413537 0.0145769 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.02 using 59 PHA bins.
# Reduced chi-squared = 1.090 for 56 degrees of freedom
# Null hypothesis probability = 3.002184e-01
Photon flux (15-150 keV) in 18.54 sec: 0.643102 ( -0.066595 0.066556 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.75413e-07 ( -1.06559e-07 1.08225e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.34157 ( -0.431996 0.822601 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 63.3909 ( -20.2304 -63.391 )
Norm@50keV : 8.56045E-03 ( -0.00397646 0.0145546 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.02 using 59 PHA bins.
# Reduced chi-squared = 1.110 for 55 degrees of freedom
# Null hypothesis probability = 2.684019e-01
Photon flux (15-150 keV) in 18.54 sec: 0.646015 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.87878e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 2.28e-07
S(50-100 keV) = 2.63e-07
T90 vs. Hardness ratio plot
T90 = 15.2079999446869 sec.
Hardness ratio (energy fluence ratio) = 1.15351
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.0693
Count Ratio (50-100 keV) / (15-25 keV) = 0.650837
Mask shadow pattern
IMX = -3.141206988733403E-01, IMY = -5.683696015884775E-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:
-400.923400 -384.995200
-239.024000 -8.284000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
255.8371 -37.8317 6.8 34.9 -83.5 0.6852 1.7 7.1 4U 1700-377
256.3281 -36.2681 6.3 35.2 -80.8 0.7810 1.9 10.6 GX 349+2
262.9832 -24.7486 5.5 37.2 -59.2 0.8026 2.1 1.4 GX 1+4
264.9453 -44.3490 5.2 26.2 -91.0 0.5857 2.2 10.6 4U 1735-44
268.3785 -1.4069 7.0 52.3 -32.5 -1.1102 -1.6 2.8 SW J1753.5-0127
270.3256 -25.0202 3.5 32.1 -51.4 0.9258 3.4 4.2 GX 5-1
270.3798 -25.7094 4.6 31.6 -52.3 0.6750 2.5 4.6 GRS 1758-258
274.0242 -14.0020 2.2 38.7 -34.8 1.5590 5.1 2.3 GX 17+2
275.9140 -30.4881 6.2 24.8 -52.5 0.4145 1.9 7.3 H1820-303
285.1133 -24.7680 9.1 24.0 -28.4 0.2621 1.3 10.1 HT1900.1-2455
288.8696 10.9543 2.7 56.8 -3.6 4.4481 4.3 4.2 GRS 1915+105
262.9710 -33.8212 2.8 31.7 -72.0 1.2440 4.2 1.2 GX 354-0
277.5613 -21.2556 2.8 30.8 -37.0 1.0061 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-8.284000 10.252000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
256.1369 -37.9541 29.8 34.6 -83.5 -0.0390 -0.4 9.7 4U 1700-377
256.4259 -36.3274 4.8 35.1 -80.8 0.2507 2.4 5.8 GX 349+2
262.8910 -24.6069 0.0 37.3 -59.1 -0.1376 -1.4 10.5 GX 1+4
264.6854 -44.5074 5.9 26.3 -91.4 -0.1231 -1.9 4.2 4U 1735-44
268.3747 -1.5241 11.3 52.2 -32.6 0.1670 1.0 4.3 SW J1753.5-0127
270.2376 -25.1649 9.9 32.1 -51.7 -0.0777 -1.2 5.7 GX 5-1
270.4334 -25.8695 4.3 31.5 -52.4 -0.1774 -2.7 10.4 GRS 1758-258
273.8696 -14.0453 7.1 38.7 -35.1 -0.1197 -1.6 7.9 GX 17+2
275.8326 -30.2613 5.1 25.0 -52.3 -0.1300 -2.3 7.9 H1820-303
285.0192 -24.7800 44.2 24.1 -28.6 -0.0126 -0.3 8.5 HT1900.1-2455
288.8477 10.9529 10.0 56.8 -3.6 0.2900 1.2 2.9 GRS 1915+105
262.9494 -33.6964 13.8 31.8 -71.9 0.0624 0.8 8.5 GX 354-0
5.4289 -51.8855 2.3 41.6 135.4 0.6437 5.0 ------ UNKNOWN
348.9437 -44.6526 0.7 33.0 118.9 1.4754 16.2 ------ UNKNOWN
270.4531 -85.0188 1.7 41.3 -164.3 0.4947 6.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
65.676600 398.278700
398.976000 783.028000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
53.3126 -54.7472 2.6 41.3 168.1 2.2498 4.5 ------ UNKNOWN
319.1877 5.0619 2.4 56.4 3.8 7.3511 4.7 ------ UNKNOWN
314.6398 1.4730 2.3 55.3 -3.0 5.3051 4.9 ------ UNKNOWN
19.2017 -73.2867 2.6 31.8 -155.8 1.4599 4.4 ------ UNKNOWN
297.9804 -5.7961 3.4 58.9 -24.3 6.8862 3.4 ------ UNKNOWN
Plot creation:
Sat May 30 15:08:57 EDT 2015