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
293.9204 2.4244 0.0031 20.3668 42.4564 3.4417314 61.856 TRIG_00291292
Foreground time interval of the image:
-0.104 15.128 (delta_t = 15.232 [sec])
Background time interval of the image:
-239.912 -0.104 (delta_t = 239.808 [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 -0.104 sec. to 15.128 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49650 ( -0.0515707 0.0515692 )
Norm@50keV : 1.46307E-02 ( -0.000388904 0.000388882 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.59 using 59 PHA bins.
# Reduced chi-squared = 0.7472 for 57 degrees of freedom
# Null hypothesis probability = 9.221532e-01
Photon flux (15-150 keV) in 15.23 sec: 1.82477 ( -0.0537842 0.053956 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.11504e-06 ( -5.95565e-08 5.96544e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.104 sec. to 15.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40801 ( -0.199875 0.118152 )
Epeak [keV] : 365.143 ( -365.144 -365.144 )
Norm@50keV : 1.60693E-02 ( -0.00173504 0.00367108 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.98 using 59 PHA bins.
# Reduced chi-squared = 0.7496 for 56 degrees of freedom
# Null hypothesis probability = 9.178128e-01
Photon flux (15-150 keV) in 15.23 sec: 1.81217 ( -0.05969 0.05989 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.1025e-06 ( -6.65399e-08 6.60677e-08 ) ergs/cm2
Band function
Time interval is from -0.104 sec. to 15.128 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.816872 ( -2.99086 -0.816643 )
beta : -1.52682 ( -0.0667662 0.061935 )
Epeak [keV] : 31.3358 ( -10.5394 89.9827 )
Norm@50keV : 0.706873 ( -0.705745 695.948 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.53 using 59 PHA bins.
# Reduced chi-squared = 0.7188 for 55 degrees of freedom
# Null hypothesis probability = 9.425148e-01
Photon flux (15-150 keV) in 15.23 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] : 16.6853 ( )
R^2/D10^2 : 0.136316 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 352.22 using 59 PHA bins.
# Reduced chi-squared = 6.1793 for 57 degrees of freedom
# Null hypothesis probability = 3.887134e-44
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.183e-07 6.557e-09
25- 50 5.156e-07 2.048e-08
50-150 1.019e-06 5.315e-08
15-150 1.652e-06 4.950e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 7.47671 (-0.198893 0.198889)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.00 using 59 PHA bins.
# Reduced chi-squared = 0.9298 for 57 degrees of freedom
# Null hypothesis probability = 6.258990e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.836e-07 8.148e-09
25- 50 5.455e-07 1.660e-08
50-150 1.196e-06 3.404e-08
15-150 2.025e-06 6.168e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.59147 (-0.716027 0.768651)
R1^2/D10^2 : 1.42472 (-0.395358 0.592369)
kT2 [keV] : 29.8896 (-2.93637 3.90723)
R2^2/D10^2 : 1.47999E-02 (-0.00506159 0.00653729)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.35 using 59 PHA bins.
# Reduced chi-squared = 0.8064 for 55 degrees of freedom
# Null hypothesis probability = 8.472314e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.484e-07 2.277e-08
25- 50 5.403e-07 3.313e-08
50-150 1.305e-06 1.015e-07
15-150 2.094e-06 1.424e-07
Peak spectrum fit
Power-law model
Time interval is from 0.212 sec. to 1.212 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21172 ( -0.0576053 0.0575026 )
Norm@50keV : 7.28843E-02 ( -0.00229097 0.00229072 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.35 using 59 PHA bins.
# Reduced chi-squared = 0.6378 for 57 degrees of freedom
# Null hypothesis probability = 9.849736e-01
Photon flux (15-150 keV) in 1 sec: 8.56947 ( -0.281636 0.28206 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.37017e-07 ( -2.54847e-08 2.5541e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.212 sec. to 1.212 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05974 ( -0.225823 0.175417 )
Epeak [keV] : 349.092 ( -349.093 -349.093 )
Norm@50keV : 8.53765E-02 ( -0.0142039 0.0218699 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.91 using 59 PHA bins.
# Reduced chi-squared = 0.6234 for 56 degrees of freedom
# Null hypothesis probability = 9.878706e-01
Photon flux (15-150 keV) in 1 sec: 8.49880 ( -0.14923 0.29784 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.31221e-07 ( -2.7162e-08 2.7037e-08 ) ergs/cm2
Band function
Time interval is from 0.212 sec. to 1.212 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.42890 ( -3.68832 -1.43146 )
beta : -1.24730 ( -0.0745432 0.0684821 )
Epeak [keV] : 33.2803 ( -9.88627 81.4241 )
Norm@50keV : 6.18127 ( -6.29353 1716.18 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.12 using 59 PHA bins.
# Reduced chi-squared = 0.6022 for 55 degrees of freedom
# Null hypothesis probability = 9.915034e-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] : 19.4758 ( )
R^2/D10^2 : 0.423768 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 231.71 using 59 PHA bins.
# Reduced chi-squared = 4.0651 for 57 degrees of freedom
# Null hypothesis probability = 6.303200e-23
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.131e-08 2.025e-09
25- 50 1.532e-07 6.750e-09
50-150 4.290e-07 2.400e-08
15-150 6.135e-07 2.445e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 35.7543 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 137.86 using 59 PHA bins.
# Reduced chi-squared = 2.4186 for 57 degrees of freedom
# Null hypothesis probability = 1.192729e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.903e-08 3.035e-09
25- 50 1.713e-07 5.700e-09
50-150 3.756e-07 1.245e-08
15-150 6.359e-07 2.085e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.26678 (-1.00607 1.10769)
R1^2/D10^2 : 4.22424 (-1.34317 2.18931)
kT2 [keV] : 33.7653 (-3.92046 5.65836)
R2^2/D10^2 : 5.91770E-02 (-0.0230289 0.0300912)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.31 using 59 PHA bins.
# Reduced chi-squared = 0.6238 for 55 degrees of freedom
# Null hypothesis probability = 9.870754e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.322e-08 7.660e-09
25- 50 1.621e-07 1.335e-08
50-150 5.102e-07 5.365e-08
15-150 7.355e-07 6.135e-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: 1.49650 ( -0.0515707 0.0515692 )
Norm@50keV : 1.46307E-02 ( -0.000388904 0.000388882 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.59 using 59 PHA bins.
# Reduced chi-squared = 0.7472 for 57 degrees of freedom
# Null hypothesis probability = 9.221532e-01
Photon flux (15-150 keV) in 15.23 sec: 1.82477 ( -0.0537842 0.053956 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.11504e-06 ( -5.95565e-08 5.96544e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40801 ( -0.199875 0.118152 )
Epeak [keV] : 365.143 ( -365.144 -365.144 )
Norm@50keV : 1.60693E-02 ( -0.00173504 0.00367108 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.98 using 59 PHA bins.
# Reduced chi-squared = 0.7496 for 56 degrees of freedom
# Null hypothesis probability = 9.178128e-01
Photon flux (15-150 keV) in 15.23 sec: 1.81217 ( -0.05969 0.05989 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.1025e-06 ( -6.65399e-08 6.60677e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.816872 ( -4.35294 -0.816643 )
beta : -1.52682 ( -0.0667662 0.061935 )
Epeak [keV] : 31.3358 ( -15.2803 83.6759 )
Norm@50keV : 0.706873 ( -0.705745 777.512 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.53 using 59 PHA bins.
# Reduced chi-squared = 0.7188 for 55 degrees of freedom
# Null hypothesis probability = 9.425148e-01
Photon flux (15-150 keV) in 15.23 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) = 5.22e-07
S(50-100 keV) = 7.40e-07
T90 vs. Hardness ratio plot
T90 = 8.71999999880791 sec.
Hardness ratio (energy fluence ratio) = 1.41762
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.37337
Count Ratio (50-100 keV) / (15-25 keV) = 1.03025
Mask shadow pattern
IMX = 2.738953237306905E-01, IMY = -2.505954614291482E-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:
-239.912000 -0.104000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9760 -15.6495 0.5 32.7 -110.9 7.6998 24.6 0.6 Sco X-1
254.6551 35.4912 62.0 51.2 -33.2 0.1159 0.2 13.2 Her X-1
256.0072 -37.8428 1.0 33.7 -155.9 2.4033 11.1 1.0 4U 1700-377
256.4486 -36.4410 2.8 32.4 -154.7 0.8425 4.1 1.3 GX 349+2
263.0045 -24.8036 2.6 20.2 -144.9 0.7889 4.4 3.5 GX 1+4
264.5595 -44.4722 3.4 35.8 -171.7 0.7496 3.4 8.0 4U 1735-44
268.3345 -1.4545 2.5 13.5 -56.0 0.8389 4.5 2.0 SW J1753.5-0127
270.2779 -25.1075 1.4 16.3 -162.0 1.4415 8.3 1.7 GX 5-1
270.3442 -25.9034 12.0 17.0 -163.5 0.1674 1.0 9.9 GRS 1758-258
274.0819 -14.2005 5.5 5.4 -140.2 0.3414 2.1 10.8 GX 17+2
276.0124 -30.3744 4.8 19.8 177.2 0.4017 2.4 4.5 H1820-303
285.2154 -24.7998 5.4 15.6 147.3 0.3522 2.1 12.2 HT1900.1-2455
288.8514 10.7853 6.7 23.9 18.1 0.3087 1.7 10.1 GRS 1915+105
299.5869 35.2120 0.7 50.1 14.3 8.5372 16.3 0.6 Cyg X-1
263.1465 -33.8722 4.7 27.0 -160.1 0.4636 2.4 8.2 GX 354-0
288.0696 -37.4631 3.3 28.2 154.9 0.7923 3.5 ------ UNKNOWN
277.3096 -23.6895 1.8 13.1 175.2 1.0868 6.3 ------ UNKNOWN
243.7931 -48.6519 2.9 47.6 -158.1 1.4540 4.1 ------ UNKNOWN
237.1303 -39.1962 2.3 46.3 -143.7 2.0476 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.104000 15.128000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.1036 -15.7757 12.9 32.6 -111.2 -0.0759 -0.9 10.8 Sco X-1
254.2952 35.2940 4.2 51.2 -33.6 0.4673 2.7 8.5 Her X-1
255.9607 -37.8100 177.8 33.7 -155.8 -0.0039 -0.1 2.4 4U 1700-377
256.2821 -36.3748 3.6 32.5 -154.4 0.1871 3.2 7.9 GX 349+2
263.1785 -24.7104 7.4 20.0 -145.0 -0.0809 -1.6 9.5 GX 1+4
264.6144 -44.3051 6.0 35.6 -171.7 0.1275 1.9 10.3 4U 1735-44
268.1985 -1.5532 7.9 13.5 -56.8 0.0698 1.5 11.8 SW J1753.5-0127
270.2132 -25.0614 6.1 16.3 -161.7 -0.0975 -1.9 4.0 GX 5-1
270.2594 -25.8877 4.1 17.0 -163.2 0.1458 2.8 9.0 GRS 1758-258
273.8926 -14.1697 25.1 5.5 -138.7 0.0214 0.5 10.4 GX 17+2
275.7922 -30.1965 0.0 19.7 177.8 0.0625 1.2 12.3 H1820-303
284.9902 -25.0654 5.2 15.8 148.4 0.1030 2.2 9.0 HT1900.1-2455
288.6725 11.0736 4.6 24.1 17.4 0.1413 2.5 10.7 GRS 1915+105
299.6170 35.2145 4.2 50.1 14.4 0.4775 2.8 1.5 Cyg X-1
263.1401 -33.8969 12.4 27.0 -160.1 -0.0522 -0.9 8.4 GX 354-0
293.9204 2.4244 0.2 20.4 42.5 3.4421 61.9 ------ UNKNOWN
239.3152 2.3216 2.6 40.8 -82.2 0.8418 4.5 ------ UNKNOWN
236.7680 -7.7678 2.9 41.0 -98.1 0.8166 4.0 ------ UNKNOWN
245.6721 27.6740 2.3 49.6 -47.2 1.0503 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
539.488580 962.187100
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9811 -15.6470 0.6 41.0 -48.9 11.5038 19.7 0.4 Sco X-1
255.9859 -37.8232 0.6 22.2 -79.4 6.3206 20.4 1.3 4U 1700-377
256.5430 -36.5581 5.8 22.0 -75.9 0.6365 2.0 9.6 GX 349+2
262.9885 -24.7697 1.8 22.3 -40.8 1.6471 6.5 1.8 GX 1+4
264.5288 -44.4320 3.0 16.1 -100.9 0.9212 3.8 9.2 4U 1735-44
268.4046 -1.4178 2.7 39.3 -6.3 1.5670 4.3 3.0 SW J1753.5-0127
270.2812 -25.0868 1.5 17.4 -27.5 1.9183 7.6 0.5 GX 5-1
270.3951 -25.7267 3.8 16.9 -28.6 0.7848 3.2 5.1 GRS 1758-258
274.1028 -14.0275 3.2 25.5 -4.1 1.2650 3.6 5.7 GX 17+2
275.9611 -30.3305 2.5 10.2 -25.2 1.0886 4.6 2.9 H1820-303
285.0946 -25.0602 5.4 12.9 22.9 0.4794 2.1 9.0 HT1900.1-2455
288.8915 10.9651 4.1 49.1 25.3 -3.1178 -2.8 5.6 GRS 1915+105
262.8147 -33.7896 7.6 17.8 -63.9 0.3745 1.5 9.1 GX 354-0
332.2853 -55.7355 3.9 36.4 154.3 1.3300 3.0 ------ UNKNOWN
277.3305 -23.7920 1.7 15.3 -5.3 1.6422 6.8 ------ UNKNOWN
262.0704 13.6976 2.2 55.6 -7.1 4.4658 5.3 ------ UNKNOWN
251.9816 9.6302 3.0 56.3 -20.0 3.6817 3.9 ------ UNKNOWN
205.2942 -70.2636 2.7 51.0 -135.6 6.1264 4.3 ------ UNKNOWN
Plot creation:
Sun May 31 09:17:59 EDT 2015