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
188.1014 -60.2748 0.0051 31.6241 -66.3882 3.4022921 37.639 TRIG_00316910
Foreground time interval of the image:
-3.812 14.117 (delta_t = 17.929 [sec])
Background time interval of the image:
-239.584 -3.812 (delta_t = 235.772 [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 -3.812 sec. to 32.212 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43978 ( -0.0769673 0.077068 )
Norm@50keV : 7.37970E-03 ( -0.00030614 0.00030601 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.95 using 59 PHA bins.
# Reduced chi-squared = 1.017 for 57 degrees of freedom
# Null hypothesis probability = 4.398941e-01
Photon flux (15-150 keV) in 36.02 sec: 0.907163 ( -0.0400399 0.0401429 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.54852e-06 ( -1.14401e-07 1.14731e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.812 sec. to 32.212 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26608 ( -0.313525 0.210551 )
Epeak [keV] : 229.154 ( -229.154 -229.154 )
Norm@50keV : 8.89504E-03 ( -0.00173378 0.00345242 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.96 using 59 PHA bins.
# Reduced chi-squared = 1.017 for 56 degrees of freedom
# Null hypothesis probability = 4.392302e-01
Photon flux (15-150 keV) in 36.02 sec: 0.897119 ( -0.04321 0.04335 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.52083e-06 ( -1.25306e-07 1.2464e-07 ) ergs/cm2
Band function
Time interval is from -3.812 sec. to 32.212 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.26616 ( 1.01725 1.01725 )
beta : -9.78548 ( 3.64452 13.6445 )
Epeak [keV] : 229.203 ( -229.202 -229.202 )
Norm@50keV : 8.89302E-03 ( -0.000367619 0.001908 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.96 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 55 degrees of freedom
# Null hypothesis probability = 4.021098e-01
Photon flux (15-150 keV) in 36.02 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] : 16.9405 ( )
R^2/D10^2 : 6.68182E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 176.98 using 59 PHA bins.
# Reduced chi-squared = 3.1049 for 57 degrees of freedom
# Null hypothesis probability = 3.227283e-14
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.408e-07 1.176e-08
25- 50 6.212e-07 3.404e-08
50-150 1.272e-06 1.041e-07
15-150 2.034e-06 1.003e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 3.74877 (-0.155444 0.155423)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.03 using 59 PHA bins.
# Reduced chi-squared = 1.158 for 57 degrees of freedom
# Null hypothesis probability = 1.931970e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.363e-07 1.534e-08
25- 50 6.470e-07 2.846e-08
50-150 1.419e-06 6.826e-08
15-150 2.402e-06 1.183e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.84955 (-1.17879 1.36748)
R1^2/D10^2 : 0.915660 (-0.414967 0.907568)
kT2 [keV] : 26.5676 (-3.31874 5.06351)
R2^2/D10^2 : 1.18744E-02 (-0.00549816 0.00749484)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.24 using 59 PHA bins.
# Reduced chi-squared = 1.132 for 55 degrees of freedom
# Null hypothesis probability = 2.342485e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.936e-07 5.549e-08
25- 50 6.154e-07 7.024e-08
50-150 1.584e-06 2.244e-07
15-150 2.493e-06 2.766e-07
Peak spectrum fit
Power-law model
Time interval is from -0.344 sec. to 0.656 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10877 ( -0.115813 0.114584 )
Norm@50keV : 3.60351E-02 ( -0.00236084 0.00235861 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.71 using 59 PHA bins.
# Reduced chi-squared = 0.9599 for 57 degrees of freedom
# Null hypothesis probability = 5.613719e-01
Photon flux (15-150 keV) in 1 sec: 4.18345 ( -0.281957 0.282407 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.75708e-07 ( -2.70532e-08 2.71816e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.344 sec. to 0.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10367 ( -0.384023 0.172806 )
Epeak [keV] : 9998.20 ( )
Norm@50keV : 3.62301E-02 ( -0.00236366 0.0205755 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.71 using 59 PHA bins.
# Reduced chi-squared = 0.9770 for 56 degrees of freedom
# Null hypothesis probability = 5.238146e-01
Photon flux (15-150 keV) in 1 sec: 4.18235 ( -0.29061 0.28138 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.7502e-07 ( -2.7486e-08 2.7984e-08 ) ergs/cm2
Band function
Time interval is from -0.344 sec. to 0.656 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.76019 ( -3.75991 -3.75991 )
beta : -1.14543 ( -0.128511 0.126093 )
Epeak [keV] : 26.6532 ( -26.6358 129.443 )
Norm@50keV : 237.258 ( -237.888 6680.98 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.83 using 59 PHA bins.
# Reduced chi-squared = 0.9786 for 55 degrees of freedom
# Null hypothesis probability = 5.195765e-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] : 21.0196 (-1.96685 2.24223)
R^2/D10^2 : 0.167246 (-0.0460937 0.0621642)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 110.93 using 59 PHA bins.
# Reduced chi-squared = 1.9461 for 57 degrees of freedom
# Null hypothesis probability = 2.501260e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.395e-08 1.945e-09
25- 50 7.177e-08 7.825e-09
50-150 2.364e-07 2.595e-08
15-150 3.221e-07 2.910e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 17.1762 (-1.15925 1.15914)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 96.14 using 59 PHA bins.
# Reduced chi-squared = 1.687 for 57 degrees of freedom
# Null hypothesis probability = 9.162639e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.278e-08 3.385e-09
25- 50 8.229e-08 8.900e-09
50-150 1.805e-07 4.890e-08
15-150 3.055e-07 5.230e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.38967 (-1.72633 1.99742)
R1^2/D10^2 : 1.98314 (-0.951946 2.21913)
kT2 [keV] : 38.5722 (-7.97051 15.838)
R2^2/D10^2 : 2.12919E-02 (-0.0131385 0.0225927)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.63 using 59 PHA bins.
# Reduced chi-squared = 0.9568 for 55 degrees of freedom
# Null hypothesis probability = 5.658938e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.028e-08 8.945e-09
25- 50 7.781e-08 1.779e-08
50-150 2.736e-07 9.315e-08
15-150 3.817e-07 1.087e-07
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: 1.39136 ( -0.069236 0.069217 )
Norm@50keV : 1.28109E-02 ( -0.000478851 0.000478832 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.13 using 59 PHA bins.
# Reduced chi-squared = 0.9672 for 57 degrees of freedom
# Null hypothesis probability = 5.455258e-01
Photon flux (15-150 keV) in 17.93 sec: 1.55710 ( -0.0623506 0.0624977 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.22348e-06 ( -8.9666e-08 8.98709e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19391 ( -0.280291 0.226075 )
Epeak [keV] : 225.538 ( )
Norm@50keV : 1.57838E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.52 using 59 PHA bins.
# Reduced chi-squared = 0.9558 for 56 degrees of freedom
# Null hypothesis probability = 5.692174e-01
Photon flux (15-150 keV) in 17.93 sec: 1.53768 ( -0.06713 0.06735 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.19802e-06 ( -9.71268e-08 9.66786e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.19399 ( 0.943532 0.943532 )
beta : -9.74028 ( 9.74028 19.7403 )
Epeak [keV] : 225.575 ( -205.396 -225.575 )
Norm@50keV : 1.57806E-02 ( -0.00325805 0.00526464 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.52 using 59 PHA bins.
# Reduced chi-squared = 0.9731 for 55 degrees of freedom
# Null hypothesis probability = 5.312514e-01
Photon flux (15-150 keV) in 17.93 sec: ( ) 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) = 6.12e-07
S(50-100 keV) = 9.02e-07
T90 vs. Hardness ratio plot
T90 = 25.8120000064373 sec.
Hardness ratio (energy fluence ratio) = 1.47386
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.39306
Count Ratio (50-100 keV) / (15-25 keV) = 1.18703
Mask shadow pattern
IMX = 2.466448305824361E-01, IMY = 5.642309913040295E-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:
-239.584000 -3.812000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.6652 -60.6207 7.8 38.3 -75.8 1.0260 1.5 10.3 Cen X-3
186.5602 -62.6352 250.2 31.0 -71.0 0.0148 0.0 8.5 GX 301-2
244.9894 -15.6342 0.6 46.8 36.9 18.8057 20.1 0.7 Sco X-1
256.0042 -37.8490 1.2 23.9 51.2 2.3772 9.6 0.9 4U 1700-377
256.5692 -36.5144 3.0 25.2 52.3 1.0239 3.9 8.5 GX 349+2
263.1645 -24.7723 7.8 37.3 62.2 0.8661 1.5 8.6 GX 1+4
264.6318 -44.5598 5.3 17.8 71.4 0.4978 2.2 8.1 4U 1735-44
270.2039 -24.9667 5.9 37.9 72.6 1.3880 2.0 8.0 GX 5-1
270.4564 -25.7089 7.5 37.3 73.2 1.0007 1.5 8.6 GRS 1758-258
275.9870 -30.5503 0.0 33.7 83.3 -0.6321 -1.3 11.5 H1820-303
262.8904 -33.8327 7.6 28.2 63.4 0.4626 1.5 4.9 GX 354-0
218.8338 -31.1167 2.6 39.1 -3.9 1.2582 4.4 ------ UNKNOWN
220.3217 -34.0824 3.2 35.9 -4.4 0.9614 3.7 ------ UNKNOWN
194.1372 -36.3794 3.9 45.6 -34.0 1.3168 2.9 ------ UNKNOWN
182.5579 -36.8263 4.0 50.7 -44.5 3.6856 2.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-3.812000 14.116590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.0042 -60.5917 31.3 38.6 -76.1 -0.0612 -0.4 9.4 Cen X-3
186.2684 -62.8696 6.0 31.0 -71.5 0.1743 1.9 12.2 GX 301-2
245.2132 -15.6486 0.0 46.8 37.1 -0.0282 -0.2 13.5 Sco X-1
256.1660 -37.8977 258.8 23.9 51.5 -0.0028 -0.0 9.1 4U 1700-377
256.6571 -36.3715 18.9 25.4 52.4 0.0408 0.6 11.1 GX 349+2
262.9182 -24.6460 6.1 37.4 61.8 -0.2500 -1.9 7.8 GX 1+4
264.8422 -44.6073 28.5 17.8 71.9 0.0226 0.4 10.3 4U 1735-44
270.4395 -25.0834 8.3 37.9 73.0 0.2154 1.4 8.4 GX 5-1
270.4198 -25.7124 13.6 37.2 73.1 -0.1213 -0.8 6.6 GRS 1758-258
275.8234 -30.2590 6.6 33.9 82.9 -0.1903 -1.8 8.3 H1820-303
262.9256 -33.9049 11.4 28.2 63.5 -0.0725 -1.0 5.3 GX 354-0
291.4856 -77.0582 2.8 19.0 -151.1 0.2094 4.1 ------ UNKNOWN
188.1013 -60.2747 0.3 31.6 -66.4 3.4025 37.3 ------ UNKNOWN
62.9163 -67.9480 2.5 49.9 -134.5 1.2040 4.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
68.916590 819.616600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.7384 -40.6398 0.0 37.3 -106.9 1.3190 1.0 10.8 Vela X-1
170.4711 -60.5334 2.9 8.7 -123.7 1.5978 4.0 7.1 Cen X-3
186.5749 -62.7416 2.3 2.6 172.1 2.3227 5.0 2.8 GX 301-2
201.4236 -43.0080 1.2 19.0 6.5 3.7776 9.3 ------ UNKNOWN
152.4309 -58.3121 1.3 18.1 -123.9 4.0670 8.8 ------ UNKNOWN
Plot creation:
Sun May 31 07:00:52 EDT 2015