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
343.9286 -70.9731 0.0121 27.1289 129.1528 0.3613818 15.805 TRIG_00370846
Foreground time interval of the image:
0.024 2.440 (delta_t = 2.416 [sec])
Background time interval of the image:
-239.048 0.024 (delta_t = 239.072 [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 0.512000
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 0.512000
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 0.512000
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 0.024 sec. to 2.440 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79615 ( -0.193281 0.201623 )
Norm@50keV : 8.89137E-03 ( -0.00113526 0.00111183 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.92 using 59 PHA bins.
# Reduced chi-squared = 1.384 for 57 degrees of freedom
# Null hypothesis probability = 2.891445e-02
Photon flux (15-150 keV) in 2.416 sec: 1.22339 ( -0.130942 0.130971 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.97788e-07 ( -2.54709e-08 2.60203e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.024 sec. to 2.440 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30114 ( -0.883056 0.412317 )
Epeak [keV] : 61.9515 ( -19.1208 -61.9515 )
Norm@50keV : 1.68108E-02 ( -0.0103738 0.0354839 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.60 using 59 PHA bins.
# Reduced chi-squared = 1.386 for 56 degrees of freedom
# Null hypothesis probability = 2.958503e-02
Photon flux (15-150 keV) in 2.416 sec: 1.19838 ( -0.13586 0.13583 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.87988e-07 ( -2.86093e-08 2.9645e-08 ) ergs/cm2
Band function
Time interval is from 0.024 sec. to 2.440 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.30075 ( -0.47884 1.0651 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 61.9220 ( -20.3328 -61.922 )
Norm@50keV : 1.68174E-02 ( -0.00818514 0.0354401 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.60 using 59 PHA bins.
# Reduced chi-squared = 1.411 for 55 degrees of freedom
# Null hypothesis probability = 2.402117e-02
Photon flux (15-150 keV) in 2.416 sec: 1.19850 ( 5.8015 -0.13455 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.89684e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.0546 (-1.39216 1.65011)
R^2/D10^2 : 0.395627 (-0.159196 0.257087)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 94.70 using 59 PHA bins.
# Reduced chi-squared = 1.661 for 57 degrees of freedom
# Null hypothesis probability = 1.264641e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.443e-08 4.878e-09
25- 50 6.952e-08 1.020e-08
50-150 4.817e-08 1.283e-08
15-150 1.421e-07 2.092e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 97.4448 (-31.8919 64.8578)
Norm : 5.44375 (-0.764615 0.948264)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.61 using 59 PHA bins.
# Reduced chi-squared = 1.362 for 57 degrees of freedom
# Null hypothesis probability = 3.611090e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.437e-08 5.206e-09
25- 50 5.912e-08 7.562e-09
50-150 9.440e-08 4.292e-08
15-150 1.879e-07 4.622e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.66009 (-2.39153 2.10085)
R1^2/D10^2 : 1.78011 (-1.05448 6.7648)
kT2 [keV] : 22.7649 (-7.50123 16.6689)
R2^2/D10^2 : 1.92724E-02 (-0.0165039 0.07885)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.86 using 59 PHA bins.
# Reduced chi-squared = 1.416 for 55 degrees of freedom
# Null hypothesis probability = 2.293316e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.341e-08 1.609e-08
25- 50 5.972e-08 2.595e-08
50-150 9.676e-08 5.592e-08
15-150 1.899e-07 8.162e-08
Peak spectrum fit
Power-law model
Time interval is from -0.008 sec. to 0.992 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71279 ( -0.194838 0.202761 )
Norm@50keV : 1.42068E-02 ( -0.0018813 0.00184872 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.46 using 59 PHA bins.
# Reduced chi-squared = 1.271 for 57 degrees of freedom
# Null hypothesis probability = 8.139668e-02
Photon flux (15-150 keV) in 1 sec: 1.89533 ( -0.21676 0.216784 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31411e-07 ( -1.80295e-08 1.84273e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.008 sec. to 0.992 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.670153 ( -1.16344 0.878345 )
Epeak [keV] : 55.1356 ( -12.0273 63.3437 )
Norm@50keV : 5.49952E-02 ( -0.0549954 0.198594 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.20 using 59 PHA bins.
# Reduced chi-squared = 1.218 for 56 degrees of freedom
# Null hypothesis probability = 1.270433e-01
Photon flux (15-150 keV) in 1 sec: 1.82674 ( -0.2238 0.22393 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18533e-07 ( -1.96877e-08 2.1027e-08 ) ergs/cm2
Band function
Time interval is from -0.008 sec. to 0.992 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.670047 ( -0.679635 0.982199 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 55.1248 ( -11.6507 63.2471 )
Norm@50keV : 5.50023E-02 ( -0.0350504 0.199799 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.20 using 59 PHA bins.
# Reduced chi-squared = 1.240 for 55 degrees of freedom
# Null hypothesis probability = 1.088641e-01
Photon flux (15-150 keV) in 1 sec: 1.84004 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20941e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.4583 (-1.37418 1.61496)
R^2/D10^2 : 0.561829 (-0.216286 0.336164)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.78 using 59 PHA bins.
# Reduced chi-squared = 1.329 for 57 degrees of freedom
# Null hypothesis probability = 4.877843e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.552e-08 3.195e-09
25- 50 4.620e-08 6.850e-09
50-150 3.532e-08 9.505e-09
15-150 9.704e-08 1.467e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 112.432 (-39.9239 84.2816)
Norm : 8.20983 (-1.12187 1.41651)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.43 using 59 PHA bins.
# Reduced chi-squared = 1.218 for 57 degrees of freedom
# Null hypothesis probability = 1.249925e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.143e-08 3.555e-09
25- 50 3.790e-08 6.550e-09
50-150 6.544e-08 3.479e-08
15-150 1.248e-07 4.056e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.32192 (-4.21148 2.40009)
R1^2/D10^2 : 1.31323 (-0.691205 8.70657)
kT2 [keV] : 25.2793 (-21.0864 68.6251)
R2^2/D10^2 : 1.72027E-02 (-0.0171374 0.240049)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.88 using 59 PHA bins.
# Reduced chi-squared = 1.234 for 55 degrees of freedom
# Null hypothesis probability = 1.139514e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.881e-08 1.039e-08
25- 50 4.249e-08 2.236e-08
50-150 6.069e-08 3.533e-08
15-150 1.220e-07 6.005e-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: 1.79615 ( -0.193281 0.201623 )
Norm@50keV : 8.89137E-03 ( -0.00113526 0.00111183 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.92 using 59 PHA bins.
# Reduced chi-squared = 1.384 for 57 degrees of freedom
# Null hypothesis probability = 2.891445e-02
Photon flux (15-150 keV) in 2.416 sec: 1.22339 ( -0.130942 0.130971 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.97788e-07 ( -2.54709e-08 2.60203e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30114 ( -0.883056 0.412317 )
Epeak [keV] : 61.9515 ( -19.1208 -61.9515 )
Norm@50keV : 1.68108E-02 ( -0.0103738 0.0354839 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.60 using 59 PHA bins.
# Reduced chi-squared = 1.386 for 56 degrees of freedom
# Null hypothesis probability = 2.958503e-02
Photon flux (15-150 keV) in 2.416 sec: 1.19838 ( -0.13586 0.13583 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.87988e-07 ( -2.86093e-08 2.9645e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.30075 ( -0.47884 1.0651 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 61.9220 ( -20.3328 -61.922 )
Norm@50keV : 1.68174E-02 ( -0.00818513 0.0354401 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.60 using 59 PHA bins.
# Reduced chi-squared = 1.411 for 55 degrees of freedom
# Null hypothesis probability = 2.402117e-02
Photon flux (15-150 keV) in 2.416 sec: 1.19850 ( 5.8015 -0.13455 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.89684e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 5.56e-08
S(50-100 keV) = 6.41e-08
T90 vs. Hardness ratio plot
T90 = 2.1599999666214 sec.
Hardness ratio (energy fluence ratio) = 1.15288
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.37651
Count Ratio (50-100 keV) / (15-25 keV) = 0.789745
Mask shadow pattern
IMX = -3.235003087383637E-01, IMY = -3.973183775783828E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
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:
-239.048000 0.024000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.0261 -60.6619 347.9 37.5 -132.5 -0.0124 -0.0 8.8 Cen X-3
186.6843 -62.7498 158.4 30.6 -124.9 -0.0212 -0.1 1.4 GX 301-2
244.9663 -15.6435 0.7 52.7 -27.8 9.9837 16.2 0.8 Sco X-1
255.9619 -37.8166 0.8 29.4 -17.0 2.9420 14.6 2.0 4U 1700-377
256.3477 -36.4348 2.3 30.8 -16.2 1.0770 5.0 4.3 GX 349+2
263.1413 -24.6886 229.2 42.3 -5.5 -0.0159 -0.1 8.0 GX 1+4
264.5620 -44.3310 3.5 22.7 -2.8 0.6360 3.3 10.5 4U 1735-44
270.2364 -25.0774 5.3 42.2 4.1 0.7877 2.2 2.6 GX 5-1
270.2693 -25.6901 3.1 41.6 4.2 1.3311 3.7 3.6 GRS 1758-258
274.0860 -14.0437 5.1 53.5 7.7 1.7223 2.3 4.7 GX 17+2
275.9297 -30.4008 3.5 37.4 12.8 0.9564 3.3 2.0 H1820-303
285.1578 -24.8875 9.4 44.3 23.6 0.5913 1.2 6.9 HT1900.1-2455
262.9255 -33.8038 9.6 33.2 -5.8 -0.2949 -1.2 3.7 GX 354-0
52.7207 -59.0148 3.4 52.0 154.9 3.6910 3.4 ------ UNKNOWN
255.2339 -41.6557 2.5 25.7 -19.1 0.9111 4.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.024000 2.440000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.4330 -60.6139 3.8 37.4 -132.2 -0.0927 -3.1 3.5 Cen X-3
186.3544 -62.7589 5.6 30.7 -125.1 -0.0493 -2.0 8.3 GX 301-2
244.8666 -15.6764 9.0 52.7 -27.9 0.0750 1.3 6.9 Sco X-1
255.8016 -37.8821 10.9 29.4 -17.3 0.0199 1.1 9.1 4U 1700-377
256.4345 -36.4432 211.1 30.8 -16.1 0.0011 0.1 1.2 GX 349+2
262.9957 -24.7507 2138.7 42.2 -5.7 -0.0001 -0.0 0.8 GX 1+4
264.7978 -44.6032 6.6 22.4 -2.3 0.0316 1.7 9.5 4U 1735-44
270.3714 -24.9954 101.1 42.3 4.2 0.0032 0.1 6.9 GX 5-1
270.3961 -25.7414 7.7 41.5 4.3 -0.0409 -1.5 5.1 GRS 1758-258
274.0209 -13.9818 16.8 53.5 7.6 -0.0484 -0.7 3.4 GX 17+2
275.9998 -30.2880 4.5 37.5 12.9 0.0647 2.6 6.1 H1820-303
285.0010 -25.0680 5.6 44.1 23.4 -0.0821 -2.1 9.1 HT1900.1-2455
262.9503 -33.7980 6.3 33.2 -5.8 0.0379 1.8 2.9 GX 354-0
347.9556 -53.3741 2.3 40.7 108.2 0.3807 5.0 ------ UNKNOWN
343.9288 -70.9732 0.7 27.1 129.2 0.3613 15.8 ------ UNKNOWN
58.6992 -63.4265 2.6 48.4 159.9 0.2194 4.4 ------ UNKNOWN
280.8838 -26.2075 2.0 42.3 18.5 0.1882 5.9 ------ UNKNOWN
279.8275 -63.7157 2.3 7.8 67.1 0.0820 5.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
406.452600 638.552590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
263.0771 -24.5935 11.7 45.1 -50.5 -0.5750 -1.0 9.9 GX 1+4
264.8178 -44.3228 7.7 36.7 -78.1 -0.6020 -1.5 8.3 4U 1735-44
268.3311 -1.4685 7.1 56.1 -23.2 1.1278 1.6 2.4 SW J1753.5-0127
270.1871 -25.1239 8.5 39.3 -46.2 0.4632 1.4 5.9 GX 5-1
270.1428 -25.6524 0.0 39.1 -46.9 0.6267 1.9 10.2 GRS 1758-258
273.9206 -14.0030 4.6 43.3 -29.5 0.8286 2.5 5.4 GX 17+2
275.9507 -30.3553 23.6 32.4 -49.8 -0.1163 -0.5 1.5 H1820-303
285.0009 -24.8971 5.7 28.3 -32.3 0.4128 2.0 2.4 HT1900.1-2455
288.7665 10.9411 3.2 55.2 5.8 2.8212 3.5 1.9 GRS 1915+105
262.9693 -33.7877 66.6 41.0 -62.6 0.0944 0.2 3.0 GX 354-0
297.6792 13.1710 3.4 54.4 16.7 3.5138 3.4 ------ UNKNOWN
298.1918 0.2666 2.5 41.9 12.2 1.1847 4.6 ------ UNKNOWN
49.5919 -62.8239 2.6 58.3 -175.7 5.7127 4.4 ------ UNKNOWN
5.7023 -71.6122 2.8 41.5 -165.2 1.0796 4.2 ------ UNKNOWN
51.9597 -67.0701 3.3 57.5 -170.6 3.0221 3.5 ------ UNKNOWN
60.5531 -69.7183 3.2 59.1 -166.2 4.3238 3.7 ------ UNKNOWN
Plot creation:
Sun May 31 02:54:47 EDT 2015