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
252.0507 -36.0371 0.0128 12.5680 11.9314 1.1102854 15.108 TRIG_00353728
Foreground time interval of the image:
0.252 56.132 (delta_t = 55.880 [sec])
Background time interval of the image:
-620.859 -588.914 (delta_t = 31.945 [sec])
-239.960 0.252 (delta_t = 240.212 [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 0.252 sec. to 56.132 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51636 ( -0.213755 0.214969 )
Norm@50keV : 1.15968E-03 ( -0.000132126 0.000130726 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.41 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 57 degrees of freedom
# Null hypothesis probability = 4.599344e-01
Photon flux (15-150 keV) in 55.88 sec: 0.145420 ( -0.016301 0.01636 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.13143e-07 ( -7.7011e-08 7.80141e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.252 sec. to 56.132 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52610 ( -0.352412 0.205446 )
Epeak [keV] : 9999.31 ( -9999.36 -9999.36 )
Norm@50keV : 1.16049E-03 ( -0.00116095 0.000498734 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.44 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 56 degrees of freedom
# Null hypothesis probability = 4.217659e-01
Photon flux (15-150 keV) in 55.88 sec: 0.145859 ( -0.016932 0.015987 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.12104e-07 ( -7.5918e-08 7.74273e-08 ) ergs/cm2
Band function
Time interval is from 0.252 sec. to 56.132 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.95644 ( -4.95644 -4.95644 )
beta : -1.54857 ( -0.237651 0.226134 )
Epeak [keV] : 21.1728 ( -21.1728 5.25484 )
Norm@50keV : 322.548 ( -35.1063 676039 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.28 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 55 degrees of freedom
# Null hypothesis probability = 3.905527e-01
Photon flux (15-150 keV) in 55.88 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] : 15.6882 (-2.82378 3.53799)
R^2/D10^2 : 1.31325E-02 (-0.00649614 0.0130972)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 95.15 using 59 PHA bins.
# Reduced chi-squared = 1.669 for 57 degrees of freedom
# Null hypothesis probability = 1.143015e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.750e-08 9.583e-09
25- 50 1.551e-07 2.713e-08
50-150 2.648e-07 6.043e-08
15-150 4.575e-07 7.158e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 0.589317 (-0.0645578 0.0645537)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.13 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 57 degrees of freedom
# Null hypothesis probability = 3.629883e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.202e-08 4.630e-08
25- 50 1.578e-07 8.636e-08
50-150 3.460e-07 1.885e-07
15-150 5.858e-07 3.205e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.68630 (-1.24268 1.65611)
R1^2/D10^2 : 0.395073 (-0.247468 0.707372)
kT2 [keV] : 31.8326 (-8.34808 19.1787)
R2^2/D10^2 : 1.09382E-03 (-0.000795893 0.00178477)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.06 using 59 PHA bins.
# Reduced chi-squared = 0.9830 for 55 degrees of freedom
# Null hypothesis probability = 5.104412e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.678e-08 4.743e-08
25- 50 1.364e-07 5.381e-08
50-150 4.171e-07 2.228e-07
15-150 6.502e-07 2.536e-07
Peak spectrum fit
Power-law model
Time interval is from 0.250 sec. to 1.250 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.947780 ( -0.160264 0.157323 )
Norm@50keV : 1.51740E-02 ( -0.00124851 0.00124428 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.27 using 59 PHA bins.
# Reduced chi-squared = 1.110 for 57 degrees of freedom
# Null hypothesis probability = 2.647724e-01
Photon flux (15-150 keV) in 1 sec: 1.74322 ( -0.144551 0.14504 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67232e-07 ( -1.53541e-08 1.5451e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.250 sec. to 1.250 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.948078 ( -0.17586 0.153348 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.52499E-02 ( -0.00124277 0.00460156 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.31 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 56 degrees of freedom
# Null hypothesis probability = 2.343064e-01
Photon flux (15-150 keV) in 1 sec: 1.74473 ( -0.14663 0.14293 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.66743e-07 ( -1.4901e-08 1.5862e-08 ) ergs/cm2
Band function
Time interval is from 0.250 sec. to 1.250 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.844337 ( 0.844337 0.844337 )
beta : -0.947772 ( -0.157267 0.160559 )
Epeak [keV] : 27.9849 ( -27.9849 -27.9849 )
Norm@50keV : 2.29355E-02 ( -0.00899986 2.20854 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.27 using 59 PHA bins.
# Reduced chi-squared = 1.150 for 55 degrees of freedom
# Null hypothesis probability = 2.076033e-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] : 24.9813 (-2.978 3.57129)
R^2/D10^2 : 4.19702E-02 (-0.0135753 0.019405)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 95.16 using 59 PHA bins.
# Reduced chi-squared = 1.669 for 57 degrees of freedom
# Null hypothesis probability = 1.142285e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.552e-09 7.985e-10
25- 50 2.581e-08 3.500e-09
50-150 1.195e-07 1.753e-08
15-150 1.498e-07 1.685e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 7.00150 (-0.596382 0.596346)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 104.55 using 59 PHA bins.
# Reduced chi-squared = 1.8342 for 57 degrees of freedom
# Null hypothesis probability = 1.257145e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.744e-08 6.064e-09
25- 50 3.354e-08 1.618e-08
50-150 7.357e-08 3.752e-08
15-150 1.245e-07 5.898e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.83361 (-1.43739 1.92519)
R1^2/D10^2 : 2.57718 (-1.69069 5.7105)
kT2 [keV] : 34.5680 (-5.95663 9.83725)
R2^2/D10^2 : 1.49034E-02 (-0.00745544 0.0110561)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.89 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 55 degrees of freedom
# Null hypothesis probability = 3.352963e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.372e-08 6.520e-09
25- 50 2.703e-08 8.895e-09
50-150 1.313e-07 3.262e-08
15-150 1.720e-07 4.133e-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: 1.51636 ( -0.213755 0.214969 )
Norm@50keV : 1.15968E-03 ( -0.000132126 0.000130726 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.41 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 57 degrees of freedom
# Null hypothesis probability = 4.599344e-01
Photon flux (15-150 keV) in 55.88 sec: 0.145420 ( -0.016301 0.01636 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.13143e-07 ( -7.7011e-08 7.80141e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52610 ( -0.352412 0.205446 )
Epeak [keV] : 9999.31 ( -9999.36 -9999.36 )
Norm@50keV : 1.16049E-03 ( -0.00116095 0.000498734 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.44 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 56 degrees of freedom
# Null hypothesis probability = 4.217659e-01
Photon flux (15-150 keV) in 55.88 sec: 0.145859 ( -0.016932 0.015987 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.12104e-07 ( -7.5918e-08 7.74273e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.95644 ( -4.95644 -4.95644 )
beta : -1.54857 ( -0.237651 0.226134 )
Epeak [keV] : 21.1728 ( -21.1728 5.25484 )
Norm@50keV : 322.548 ( -35.1063 676039 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.28 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 55 degrees of freedom
# Null hypothesis probability = 3.905527e-01
Photon flux (15-150 keV) in 55.88 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) = 1.53e-07
S(50-100 keV) = 2.14e-07
T90 vs. Hardness ratio plot
T90 = 54.9959999918938 sec.
Hardness ratio (energy fluence ratio) = 1.39869
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.942517
Count Ratio (50-100 keV) / (15-25 keV) = 0.841626
Mask shadow pattern
IMX = 2.181239179977716E-01, IMY = -4.609093939030418E-02
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:
-620.859400 -588.914100
-239.960000 0.252000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.5126 -62.8308 5.5 57.2 -24.2 -2.7111 -2.1 5.4 GX 301-2
244.9810 -15.6459 0.4 25.7 68.6 9.1132 31.5 0.4 Sco X-1
256.1170 -37.9571 4.9 10.3 -3.2 0.4758 2.3 9.2 4U 1700-377
256.4445 -36.2562 4.1 9.3 5.0 0.5800 2.8 10.0 GX 349+2
263.0750 -24.7385 3.4 8.1 100.4 0.6786 3.4 3.6 GX 1+4
264.6794 -44.6523 0.0 12.5 -50.4 0.8069 3.9 12.4 4U 1735-44
268.4600 -1.5643 5.7 30.7 127.1 0.6494 2.0 8.7 SW J1753.5-0127
270.3489 -24.9037 10.6 8.1 148.7 0.2106 1.1 11.1 GX 5-1
270.0844 -25.6986 13.3 7.2 149.5 0.1738 0.9 12.1 GRS 1758-258
274.0591 -14.1202 2.2 19.4 145.9 1.1141 5.2 5.9 GX 17+2
275.9500 -30.3410 1.8 8.3 -157.5 1.3246 6.5 2.0 H1820-303
285.0799 -24.7402 9.0 17.9 -166.7 -0.2759 -1.3 11.1 HT1900.1-2455
288.7317 10.9861 2.9 48.2 153.2 3.2118 4.0 4.6 GRS 1915+105
263.0026 -33.8071 2.0 3.4 4.9 1.2292 5.6 1.8 GX 354-0
272.3470 5.1837 2.5 37.8 132.9 2.2301 4.7 ------ UNKNOWN
298.7033 -3.3383 2.7 41.8 176.3 1.4520 4.3 ------ UNKNOWN
266.5305 -32.2150 1.2 0.0 99.8 2.1004 9.8 ------ UNKNOWN
255.7339 -48.7818 2.4 18.4 -33.5 1.0238 4.9 ------ UNKNOWN
318.7937 -9.9223 3.8 53.0 -159.3 1.8913 3.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.252000 56.132000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.7303 -62.6898 3.9 57.1 -24.1 -1.1342 -2.9 5.2 GX 301-2
245.0617 -15.4728 7.5 25.7 69.0 -0.1616 -1.5 11.1 Sco X-1
256.1125 -37.7552 11.2 10.2 -2.3 -0.0787 -1.0 8.0 4U 1700-377
256.4427 -36.4639 5.6 9.3 3.9 0.1612 2.1 2.5 GX 349+2
263.1013 -24.5991 9.4 8.2 101.0 0.0956 1.2 10.1 GX 1+4
264.6794 -44.6523 0.0 12.5 -50.4 -0.1309 -1.7 12.4 4U 1735-44
268.3268 -1.3117 51.2 31.0 126.9 -0.0288 -0.2 8.8 SW J1753.5-0127
270.4583 -25.0427 7.1 8.0 149.8 0.1293 1.6 9.7 GX 5-1
270.2567 -25.6778 6.5 7.3 150.6 0.1438 1.8 4.6 GRS 1758-258
273.9573 -13.9876 6.7 19.5 145.4 -0.1435 -1.7 4.1 GX 17+2
276.1381 -30.3587 5.0 8.4 -157.1 -0.1723 -2.3 11.0 H1820-303
285.0517 -24.7115 0.0 17.9 -166.8 -0.0926 -1.2 12.6 HT1900.1-2455
288.7593 11.0518 4.3 48.2 153.2 -0.7185 -2.7 6.8 GRS 1915+105
262.7950 -33.8584 4.9 3.5 5.4 -0.1924 -2.4 9.8 GX 354-0
297.4851 13.1479 2.4 54.2 161.5 2.3801 4.9 ------ UNKNOWN
252.0507 -36.0371 0.8 12.6 11.9 1.1104 15.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
167.340600 359.440600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
255.9226 -37.6909 21.5 26.1 59.1 0.1060 0.5 9.7 4U 1700-377
256.3846 -36.2588 6.9 26.2 62.4 0.3266 1.7 10.2 GX 349+2
262.7880 -24.7429 0.0 27.7 90.7 0.3869 1.7 12.0 GX 1+4
264.8863 -44.3455 6.0 18.3 44.3 -0.2768 -1.9 8.8 4U 1735-44
270.2751 -25.2474 117.7 22.6 101.4 -0.0177 -0.1 10.1 GX 5-1
270.2057 -25.8517 6.7 22.2 100.3 0.3119 1.7 8.4 GRS 1758-258
273.9591 -13.9820 6.2 30.4 121.5 0.4468 1.9 4.2 GX 17+2
275.8730 -30.3687 1.2 15.5 102.5 1.3739 9.2 2.7 H1820-303
285.0938 -25.1172 0.0 16.5 138.1 0.1274 0.8 12.2 HT1900.1-2455
263.0273 -33.8412 3.3 22.2 73.2 0.6644 3.5 1.9 GX 354-0
266.5544 -32.2027 2.2 20.4 81.2 1.0210 5.3 ------ UNKNOWN
301.7597 0.7174 2.2 43.3 170.4 1.5141 5.3 ------ UNKNOWN
347.1660 -60.6274 3.0 39.5 -68.1 2.1671 3.7 ------ UNKNOWN
Plot creation:
Sun May 31 03:50:19 EDT 2015