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
350.6075 -66.2317 0.0071 48.8628 -154.3548 3.4436743 26.947 TRIG_00424031
Foreground time interval of the image:
-0.260 15.221 (delta_t = 15.481 [sec])
Background time interval of the image:
-389.179 -346.667 (delta_t = 42.512 [sec])
-239.680 -0.260 (delta_t = 239.420 [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 -0.260 sec. to 82.928 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16005 ( -0.0728539 0.0720535 )
Norm@50keV : 6.58150E-03 ( -0.000258326 0.000257186 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.87 using 59 PHA bins.
# Reduced chi-squared = 0.7170 for 57 degrees of freedom
# Null hypothesis probability = 9.472247e-01
Photon flux (15-150 keV) in 83.19 sec: 0.768471 ( -0.0324109 0.0325793 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.61943e-06 ( -2.22687e-07 2.23066e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.260 sec. to 82.928 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15450 ( -0.135104 0.073082 )
Epeak [keV] : 9997.57 ( -9998.25 -9998.25 )
Norm@50keV : 6.61376E-03 ( -0.000254658 0.00130885 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.91 using 59 PHA bins.
# Reduced chi-squared = 0.7305 for 56 degrees of freedom
# Null hypothesis probability = 9.350262e-01
Photon flux (15-150 keV) in 83.19 sec: 0.768818 ( -0.033101 0.031887 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.62021e-06 ( -2.22126e-07 2.20603e-07 ) ergs/cm2
Band function
Time interval is from -0.260 sec. to 82.928 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.542039 ( 0.77524 0.77524 )
beta : -1.17286 ( -0.0461031 0.0807865 )
Epeak [keV] : 66.5097 ( -66.5699 227.537 )
Norm@50keV : 1.76091E-02 ( -0.0180964 345478 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.58 using 59 PHA bins.
# Reduced chi-squared = 0.7378 for 55 degrees of freedom
# Null hypothesis probability = 9.268577e-01
Photon flux (15-150 keV) in 83.19 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] : 22.0241 ( )
R^2/D10^2 : 2.53726E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 191.50 using 59 PHA bins.
# Reduced chi-squared = 3.3596 for 57 degrees of freedom
# Null hypothesis probability = 1.921873e-16
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.894e-07 1.581e-08
25- 50 1.002e-06 6.156e-08
50-150 3.632e-06 2.238e-07
15-150 4.823e-06 2.234e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 3.31645 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 139.15 using 59 PHA bins.
# Reduced chi-squared = 2.4413 for 57 degrees of freedom
# Null hypothesis probability = 8.030326e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.870e-07 3.011e-08
25- 50 1.322e-06 5.865e-08
50-150 2.898e-06 1.256e-07
15-150 4.907e-06 2.163e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.12117 (-1.08196 1.24627)
R1^2/D10^2 : 0.414813 (-0.154732 0.263945)
kT2 [keV] : 37.0721 (-4.82719 7.36477)
R2^2/D10^2 : 4.25593E-03 (-0.00176871 0.00234492)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.69 using 59 PHA bins.
# Reduced chi-squared = 0.7217 for 55 degrees of freedom
# Null hypothesis probability = 9.402573e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.823e-07 6.755e-08
25- 50 1.189e-06 1.314e-07
50-150 4.035e-06 4.904e-07
15-150 5.706e-06 5.536e-07
Peak spectrum fit
Power-law model
Time interval is from 0.196 sec. to 1.196 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.922682 ( -0.21325 0.204126 )
Norm@50keV : 3.28031E-02 ( -0.00407432 0.00401251 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.21 using 59 PHA bins.
# Reduced chi-squared = 0.9335 for 57 degrees of freedom
# Null hypothesis probability = 6.180511e-01
Photon flux (15-150 keV) in 1 sec: 3.76619 ( -0.467333 0.470335 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.64941e-07 ( -4.35747e-08 4.36668e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.196 sec. to 1.196 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.591071 ( -0.984122 0.428282 )
Epeak [keV] : 265.401 ( -265.4 -265.4 )
Norm@50keV : 4.47793E-02 ( -0.0153211 0.0621508 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.75 using 59 PHA bins.
# Reduced chi-squared = 0.9420 for 56 degrees of freedom
# Null hypothesis probability = 5.985717e-01
Photon flux (15-150 keV) in 1 sec: 3.71317 ( -0.48469 0.48785 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.62258e-07 ( -4.5054e-08 4.4572e-08 ) ergs/cm2
Band function
Time interval is from 0.196 sec. to 1.196 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.769101 ( 0.77313 0.77313 )
beta : -9.37164 ( -0.20398 0.213887 )
Epeak [keV] : 523.277 ( -46.8072 -46.8072 )
Norm@50keV : 3.76112E-02 ( -0.00431907 0.0188834 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.89 using 59 PHA bins.
# Reduced chi-squared = 0.9617 for 55 degrees of freedom
# Null hypothesis probability = 5.556325e-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] : 24.9601 (-3.64648 4.70021)
R^2/D10^2 : 9.35220E-02 (-0.038423 0.0600668)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.22 using 59 PHA bins.
# Reduced chi-squared = 1.074 for 57 degrees of freedom
# Null hypothesis probability = 3.272036e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.013e-08 2.519e-09
25- 50 5.742e-08 1.293e-08
50-150 2.653e-07 4.835e-08
15-150 3.329e-07 5.630e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 15.8836 (-1.95078 1.95046)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.68 using 59 PHA bins.
# Reduced chi-squared = 1.398 for 57 degrees of freedom
# Null hypothesis probability = 2.531500e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.957e-08 2.234e-08
25- 50 7.611e-08 4.248e-08
50-150 1.669e-07 9.180e-08
15-150 2.826e-07 1.564e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.60321 (-4.85452 10.6658)
R1^2/D10^2 : 1.13623 (-0.973732 23.317)
kT2 [keV] : 34.6306 (-9.52412 -34.6878)
R2^2/D10^2 : 3.03926E-02 (-0.0283582 0.0568217)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.27 using 59 PHA bins.
# Reduced chi-squared = 0.9686 for 55 degrees of freedom
# Null hypothesis probability = 5.408378e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.117e-08 1.246e-08
25- 50 6.544e-08 3.490e-08
50-150 2.780e-07 1.538e-07
15-150 3.646e-07 1.734e-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: 0.965657 ( -0.10464 0.102179 )
Norm@50keV : 1.50997E-02 ( -0.000900627 0.000892225 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.90 using 59 PHA bins.
# Reduced chi-squared = 0.6824 for 57 degrees of freedom
# Null hypothesis probability = 9.681219e-01
Photon flux (15-150 keV) in 15.48 sec: 1.73577 ( -0.105664 0.106138 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.55903e-06 ( -1.43033e-07 1.43153e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.959030 ( -0.45213 0.154174 )
Epeak [keV] : 9999.99 ( )
Norm@50keV : 1.51923E-02 ( -0.000902557 0.000823408 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.88 using 59 PHA bins.
# Reduced chi-squared = 0.6943 for 56 degrees of freedom
# Null hypothesis probability = 9.603673e-01
Photon flux (15-150 keV) in 15.48 sec: 1.73824 ( -0.1205 0.10376 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.54686e-06 ( -1.4028e-07 1.59599e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.99997 -4.99997 )
beta : -0.976600 ( -0.106103 0.107544 )
Epeak [keV] : 23.9594 ( -23.9594 8.51575 )
Norm@50keV : 1248.93 ( -67.6835 2.39268e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.69 using 59 PHA bins.
# Reduced chi-squared = 0.7034 for 55 degrees of freedom
# Null hypothesis probability = 9.532791e-01
Photon flux (15-150 keV) in 15.48 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) = 1.15e-06
S(50-100 keV) = 2.06e-06
T90 vs. Hardness ratio plot
T90 = 67.3839999437332 sec.
Hardness ratio (energy fluence ratio) = 1.7913
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.80592
Count Ratio (50-100 keV) / (15-25 keV) = 1.85299
Mask shadow pattern
IMX = -1.032044984119505E+00, IMY = 4.954754069573491E-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:
-389.179400 -346.667400
-239.680000 -0.260000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.1151 -60.6945 3.1 30.1 -69.1 1.3945 3.8 7.3 Cen X-3
186.6569 -62.7754 0.4 22.0 -69.8 8.2644 25.8 0.3 GX 301-2
256.1796 -37.8048 5.7 25.8 105.9 -0.7265 -2.0 9.4 4U 1700-377
256.3917 -36.5685 5.2 27.0 104.7 0.8723 2.2 9.0 GX 349+2
263.0190 -24.7435 114.2 40.1 103.1 0.0944 0.1 0.6 GX 1+4
264.9561 -44.3652 56.2 25.1 127.6 -0.0643 -0.2 10.5 4U 1735-44
275.9975 -30.4305 4.3 41.3 122.8 2.5072 2.7 5.3 H1820-303
263.0451 -33.6948 60.5 32.3 110.8 0.0890 0.2 8.8 GX 354-0
210.6008 -21.3401 2.5 38.6 23.2 1.7728 4.7 ------ UNKNOWN
214.2049 -55.7542 2.7 8.9 -34.6 0.9730 4.3 ------ UNKNOWN
330.2403 -57.0141 2.2 49.3 -171.9 2.9368 5.4 ------ UNKNOWN
183.4576 -25.9253 2.7 45.4 -13.6 1.8649 4.3 ------ UNKNOWN
160.1124 -42.9210 3.2 44.9 -49.9 3.1376 3.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.260000 15.220620
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.1510 -60.4951 6.1 30.1 -68.8 -0.1422 -1.9 9.1 Cen X-3
186.7273 -62.7378 2.7 22.0 -69.7 0.2715 4.3 2.8 GX 301-2
256.0883 -38.0289 5.1 25.6 106.0 0.1534 2.2 12.1 4U 1700-377
256.3733 -36.3399 360.3 27.2 104.4 0.0023 0.0 5.8 GX 349+2
263.0475 -24.7807 9.9 40.1 103.2 0.2243 1.2 3.0 GX 1+4
264.5854 -44.2866 5.5 24.9 127.0 -0.1343 -2.1 11.9 4U 1735-44
275.8381 -30.2591 8.8 41.4 122.4 0.2397 1.3 7.9 H1820-303
263.1513 -33.8161 19.2 32.3 111.1 0.0562 0.6 8.2 GX 354-0
260.1869 -23.7230 2.6 39.8 98.8 0.8099 4.4 ------ UNKNOWN
248.8520 -25.4949 2.3 34.4 84.0 0.5085 5.1 ------ UNKNOWN
350.6075 -66.2317 0.4 48.9 -154.4 3.4431 26.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
84.820670 962.367600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.2902 -60.6720 7.9 53.1 14.8 2.9635 1.5 3.0 Cen X-3
186.6431 -62.7741 1.0 50.4 24.4 21.2712 11.4 0.4 GX 301-2
203.1134 -64.5153 2.4 47.1 33.3 7.4560 4.8 ------ UNKNOWN
295.9377 -74.3354 2.9 19.2 57.0 1.5717 4.0 ------ UNKNOWN
332.2730 -15.8962 3.1 51.8 172.3 4.9695 3.7 ------ UNKNOWN
Plot creation:
Mon Jun 15 00:15:04 EDT 2015