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
241.4209 -28.3841 0.0186 32.5726 60.5478 7.0557285 10.305 TRIG_00351525
Foreground time interval of the image:
-62.396 293.581 (delta_t = 355.977 [sec])
Background time interval of the image:
-239.320 -62.396 (delta_t = 176.924 [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 8.192000
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 8.192000
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 8.192000
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 -62.396 sec. to 298.696 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69519 ( -0.206287 0.207688 )
Norm@50keV : 9.89493E-04 ( -0.0001167 0.000115851 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.57 using 59 PHA bins.
# Reduced chi-squared = 1.080 for 57 degrees of freedom
# Null hypothesis probability = 3.159904e-01
Photon flux (15-150 keV) in 361.1 sec: 0.131196 ( -0.0157055 0.0157934 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.3095e-06 ( -4.04714e-07 4.08679e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -62.396 sec. to 298.696 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33162 ( -0.886318 0.796053 )
Epeak [keV] : 88.5089 ( -75.1204 -88.5089 )
Norm@50keV : 1.52564E-03 ( -0.000631874 0.00277494 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.89 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 56 degrees of freedom
# Null hypothesis probability = 3.043496e-01
Photon flux (15-150 keV) in 361.1 sec: 0.128535 ( -0.016629 0.016664 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.20581e-06 ( -4.59948e-07 4.59319e-07 ) ergs/cm2
Band function
Time interval is from -62.396 sec. to 298.696 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.35193 ( -0.430426 0.731147 )
beta : -9.36869 ( 9.37165 19.3716 )
Epeak [keV] : 93.1660 ( -37.7544 306.13 )
Norm@50keV : 1.47664E-03 ( -0.000587413 0.00126569 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.90 using 59 PHA bins.
# Reduced chi-squared = 1.107 for 55 degrees of freedom
# Null hypothesis probability = 2.721003e-01
Photon flux (15-150 keV) in 361.1 sec: 0.128773 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.22351e-06 ( -3.22098e-06 -4.11011e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.1743 (-1.90316 2.3363)
R^2/D10^2 : 2.19362E-02 (-0.00986941 0.0174123)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.76 using 59 PHA bins.
# Reduced chi-squared = 1.382 for 57 degrees of freedom
# Null hypothesis probability = 2.970828e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.915e-07 6.476e-08
25- 50 1.018e-06 1.852e-07
50-150 1.126e-06 2.701e-07
15-150 2.436e-06 3.880e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 144.132 (-57.2463 -140.359)
Norm : 0.534165 (-0.0717675 0.103379)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.94 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 57 degrees of freedom
# Null hypothesis probability = 3.363113e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.970e-07 9.569e-08
25- 50 9.158e-07 3.163e-07
50-150 1.778e-06 1.011e-06
15-150 3.191e-06 1.630e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.16751 (-1.92732 2.24239)
R1^2/D10^2 : 0.146142 (-0.0891188 0.220898)
kT2 [keV] : 26.7213 (-7.99955 22.1993)
R2^2/D10^2 : 1.26899E-03 (-0.00108543 0.0036242)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.16 using 59 PHA bins.
# Reduced chi-squared = 1.076 for 55 degrees of freedom
# Null hypothesis probability = 3.262240e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.008e-07 2.597e-07
25- 50 9.605e-07 5.048e-07
50-150 1.795e-06 9.999e-07
15-150 3.256e-06 1.530e-06
Peak spectrum fit
Power-law model
Time interval is from 20.732 sec. to 21.732 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36923 ( -0.339944 0.33288 )
Norm@50keV : 1.24738E-02 ( -0.00241724 0.00241724 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.43 using 59 PHA bins.
# Reduced chi-squared = 0.8496 for 57 degrees of freedom
# Null hypothesis probability = 7.833617e-01
Photon flux (15-150 keV) in 1 sec: 1.50881 ( -0.309888 0.312504 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21314e-07 ( -2.49189e-08 2.51308e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 20.732 sec. to 21.732 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.976176 ( -1.62255 1.53443 )
Epeak [keV] : 138.597 ( -138.61 -138.61 )
Norm@50keV : 1.92823E-02 ( -0.00901617 0.0950405 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.14 using 59 PHA bins.
# Reduced chi-squared = 0.8596 for 56 degrees of freedom
# Null hypothesis probability = 7.632934e-01
Photon flux (15-150 keV) in 1 sec: 1.48384 ( -0.31911 0.32154 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18715e-07 ( -2.73564e-08 2.6477e-08 ) ergs/cm2
Band function
Time interval is from 20.732 sec. to 21.732 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.708266 ( -0.275422 -0.275422 )
beta : -1.59467 ( 1.57564 0.482594 )
Epeak [keV] : 47.2148 ( -46.8301 169.048 )
Norm@50keV : 0.224126 ( -0.237241 152.666 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.45 using 59 PHA bins.
# Reduced chi-squared = 0.8628 for 55 degrees of freedom
# Null hypothesis probability = 7.552325e-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] : 16.4556 (-3.79589 5.51232)
R^2/D10^2 : 0.127469 (-0.0802868 0.192505)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.32 using 59 PHA bins.
# Reduced chi-squared = 0.9355 for 57 degrees of freedom
# Null hypothesis probability = 6.137408e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.090e-09 2.843e-09
25- 50 3.055e-08 1.282e-08
50-150 5.842e-08 2.704e-08
15-150 9.606e-08 3.312e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-86.0532 -199.363)
Norm : 6.33703 (-1.23404 1.23409)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.09 using 59 PHA bins.
# Reduced chi-squared = 0.8612 for 57 degrees of freedom
# Null hypothesis probability = 7.627407e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.578e-08 9.235e-09
25- 50 3.036e-08 1.746e-08
50-150 6.657e-08 3.814e-08
15-150 1.127e-07 6.400e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.16689 (-4.81557 5.78978)
R1^2/D10^2 : 0.639215 (-0.404877 3.31102)
kT2 [keV] : 34.6249 (-22.7018 -42.1646)
R2^2/D10^2 : 7.08853E-03 (-0.00399777 0.0301621)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.42 using 59 PHA bins.
# Reduced chi-squared = 0.8622 for 55 degrees of freedom
# Null hypothesis probability = 7.563021e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.177e-08 7.510e-09
25- 50 3.098e-08 1.791e-08
50-150 7.166e-08 4.059e-08
15-150 1.144e-07 6.010e-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: 1.70207 ( -0.20937 0.21097 )
Norm@50keV : 9.74169E-04 ( -0.000117529 0.000116644 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.03 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 57 degrees of freedom
# Null hypothesis probability = 3.016489e-01
Photon flux (15-150 keV) in 356 sec: 0.129474 ( -0.0157983 0.0158868 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.21048e-06 ( -4.00863e-07 4.04904e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26276 ( )
Epeak [keV] : 80.3094 ( )
Norm@50keV : 1.64729E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.10 using 59 PHA bins.
# Reduced chi-squared = 1.091 for 56 degrees of freedom
# Null hypothesis probability = 2.978381e-01
Photon flux (15-150 keV) in 356 sec: 0.126352 ( -0.016725 0.016766 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.08867e-06 ( -4.56011e-07 2.29025e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.26932 ( -0.493137 0.698454 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 82.4473 ( -31.1866 362.181 )
Norm@50keV : 1.62137E-03 ( -0.00073663 0.000777272 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.10 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 55 degrees of freedom
# Null hypothesis probability = 2.660197e-01
Photon flux (15-150 keV) in 356 sec: 0.127011 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.12344e-06 ( -3.12095e-06 -4.11785e-07 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 8.94e-07
S(50-100 keV) = 1.10e-06
T90 vs. Hardness ratio plot
T90 = 336.375999987125 sec.
Hardness ratio (energy fluence ratio) = 1.23043
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.29228
Count Ratio (50-100 keV) / (15-25 keV) = 0.837283
Mask shadow pattern
IMX = 3.141223061373798E-01, IMY = -5.562907242225242E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
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:
-239.320000 -62.396000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9891 -15.6550 0.4 28.5 85.4 9.1928 29.2 1.0 Sco X-1
255.9882 -37.8068 1.5 26.5 31.5 1.6973 7.7 2.2 4U 1700-377
256.4146 -36.3501 4.1 25.2 33.3 0.6176 2.8 4.5 GX 349+2
263.1684 -24.7850 4.9 13.2 49.2 0.4199 2.4 9.0 GX 1+4
264.9125 -44.5043 13.9 28.7 11.5 -0.1802 -0.8 8.0 4U 1735-44
268.3451 -1.4567 3.7 16.8 154.4 0.5345 3.1 1.4 SW J1753.5-0127
270.3036 -25.0703 2.4 9.0 23.1 0.8850 4.9 1.2 GX 5-1
270.4154 -25.6749 4.5 9.5 20.9 0.5094 2.8 7.3 GRS 1758-258
274.0798 -14.0560 4.6 3.1 165.8 0.4562 2.5 4.5 GX 17+2
275.9456 -30.4356 2.2 13.4 -7.8 0.8817 5.3 4.2 H1820-303
285.2000 -24.9348 20.0 12.6 -52.6 -0.1031 -0.6 9.0 HT1900.1-2455
288.7959 10.9289 1.7 31.3 -155.7 1.3513 6.9 1.0 GRS 1915+105
299.5981 35.1986 2.5 57.4 -159.0 4.7075 4.6 0.4 Cyg X-1
262.8073 -33.8931 9.8 19.9 27.0 0.2057 1.2 9.7 GX 354-0
242.6342 7.8674 3.2 40.3 122.5 1.9993 3.6 ------ UNKNOWN
277.3703 -23.8191 2.1 7.2 -23.1 0.9049 5.5 ------ UNKNOWN
293.2415 -5.9118 2.6 21.3 -122.5 0.8124 4.5 ------ UNKNOWN
320.0869 -32.2195 3.5 43.6 -64.0 3.2218 3.3 ------ UNKNOWN
324.2266 -47.0252 3.2 50.4 -45.5 4.0068 3.6 ------ UNKNOWN
314.0932 4.6468 3.7 44.6 -118.8 2.5989 3.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-62.396000 293.580600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9696 -15.7732 4.0 28.5 85.1 -1.7772 -2.9 8.0 Sco X-1
256.0092 -37.8787 1.4 26.5 31.4 3.5458 8.3 2.3 4U 1700-377
256.2377 -36.5333 0.0 25.4 33.2 -0.0540 -0.1 11.6 GX 349+2
263.1892 -24.6196 0.0 13.1 49.8 -0.7462 -2.2 12.4 GX 1+4
264.8219 -44.4040 18.1 28.6 11.7 -0.2639 -0.6 4.4 4U 1735-44
268.4514 -1.4583 8.1 16.8 154.8 0.5012 1.4 5.0 SW J1753.5-0127
270.3549 -25.1561 11.3 9.0 22.6 -0.3489 -1.1 6.0 GX 5-1
270.1517 -25.5808 0.0 9.5 22.4 0.3251 1.0 12.7 GRS 1758-258
274.0605 -14.0687 3.9 3.0 165.4 -0.9915 -3.0 3.7 GX 17+2
276.0520 -30.2216 45.7 13.2 -8.3 -0.0831 -0.3 10.9 H1820-303
284.8721 -24.9101 4.9 12.3 -51.9 -0.8422 -2.3 8.9 HT1900.1-2455
288.6624 11.0084 6.5 31.3 -156.0 0.6472 1.8 8.8 GRS 1915+105
299.5361 35.2125 10.6 57.3 -159.1 1.8018 1.1 2.7 Cyg X-1
263.1555 -33.8831 4.3 19.7 26.3 0.9515 2.7 8.8 GX 354-0
241.4209 -28.3842 1.1 32.6 60.5 7.0591 10.3 ------ UNKNOWN
275.6430 16.7981 2.9 33.9 178.5 1.6714 4.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
415.180600 832.280590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5743 35.1841 1.1 47.6 139.5 13.6099 10.8 1.3 Cyg X-1
308.0821 40.9438 3.4 42.4 149.6 2.3063 3.3 1.4 Cyg X-3
326.3053 38.3291 4.7 28.8 157.0 0.8313 2.4 6.3 Cyg X-2
314.8421 57.9226 2.6 47.2 173.6 2.4959 4.4 ------ UNKNOWN
1.6016 -26.9725 2.5 46.8 4.4 2.6509 4.7 ------ UNKNOWN
345.3486 40.2258 3.1 22.1 -171.6 0.9888 3.8 ------ UNKNOWN
Plot creation:
Sun May 31 04:09:28 EDT 2015