Special notes of this burst
Image
Pre-slew 25.0-100.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name
242.010 11.252 0.000 26.983 110.380 0.051 7.037 TRIG_00150139
Image time interval: 0.000 to 0.512 [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 0.412 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21318 ( -0.355286 0.344386 )
Norm@50keV : 9.49449E-03 ( -0.00214829 0.00214826 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.08 using 59 PHA bins.
# Reduced chi-squared = 0.9488 for 57 degrees of freedom
# Null hypothesis probability = 5.853443e-01
Photon flux (15-150 keV) in 0.436 sec: 1.11645 ( -0.258162 0.259584 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.18533e-08 ( -1.01445e-08 1.03271e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.024 sec. to 0.412 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.42172 ( -3.13905 1.91298 )
Epeak [keV] : 64.5728 ( -15.0655 44.3646 )
Norm@50keV : 0.194169 ( -0.194397 7.10639 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.79 using 59 PHA bins.
# Reduced chi-squared = 0.8534 for 56 degrees of freedom
# Null hypothesis probability = 7.743365e-01
Photon flux (15-150 keV) in 0.436 sec: 1.02237 ( -0.256329 0.26505 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.5133e-08 ( -1.00853e-08 1.12195e-08 ) ergs/cm2
Band function
Time interval is from -0.024 sec. to 0.412 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5.06433 -5 )
beta : -2.08022 ( -1.61782 0.679792 )
Epeak [keV] : 43.7526 ( -10.2384 10.4837 )
Norm@50keV : 36.2672 ( -7.60195 132.185 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.58 using 59 PHA bins.
# Reduced chi-squared = 0.8469 for 55 degrees of freedom
# Null hypothesis probability = 7.833085e-01
Photon flux (15-150 keV) in 0.436 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.7883e-08 ( -3.78799e-08 -1.03773e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.5263 (-3.38155 4.56312)
R^2/D10^2 : 0.104332 (-0.0593258 0.124677)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.93 using 59 PHA bins.
# Reduced chi-squared = 0.8409 for 57 degrees of freedom
# Null hypothesis probability = 7.983408e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.549e-09 1.169e-09
25- 50 1.102e-08 4.914e-09
50-150 2.129e-08 8.890e-09
15-150 3.486e-08 1.309e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-83.5483 -199.363)
Norm : 4.67466 (-1.06803 1.06803)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.10 using 59 PHA bins.
# Reduced chi-squared = 0.9666 for 57 degrees of freedom
# Null hypothesis probability = 5.468170e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.075e-09 3.032e-09
25- 50 9.763e-09 5.762e-09
50-150 2.141e-08 1.261e-08
15-150 3.625e-08 2.123e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 73.8861 (-75.0507 -75.0507)
R1^2/D10^2 : 2.11569E-04 (-0.00019734 -0.00019734)
kT2 [keV] : 15.3403 (-15.3564 5.56232)
R2^2/D10^2 : 0.124985 (-0.124716 0.166261)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.80 using 59 PHA bins.
#Fit statistic : Chi-Squared = 47.77 using 59 PHA bins.
# Reduced chi-squared = 0.8692 for 55 degrees of freedom
# Reduced chi-squared = 0.8686 for 55 degrees of freedom
# Null hypothesis probability = 7.435348e-01
# Null hypothesis probability = 7.446126e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.767e-09 4.539e-08
25- 50 1.107e-08 4.142e-07
50-150 2.238e-08 5.271e-06
15-150 3.621e-08 6.002e-06
Peak spectrum fit
Power-law model
Time interval is from -0.304 sec. to 0.696 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23506 ( -0.539578 0.520556 )
Norm@50keV : 4.20344E-03 ( -0.00139032 0.001389 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.55 using 59 PHA bins.
# Reduced chi-squared = 1.027 for 57 degrees of freedom
# Null hypothesis probability = 4.182644e-01
Photon flux (15-150 keV) in 1 sec: 0.495924 ( -0.165829 0.16688 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.22416e-08 ( -1.50681e-08 1.55919e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.304 sec. to 0.696 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.44740 ( -6.37991 2.73033 )
Epeak [keV] : 62.5110 ( -18.3276 937.524 )
Norm@50keV : 9.54756E-02 ( -0.0963976 117.5 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.80 using 59 PHA bins.
# Reduced chi-squared = 0.9964 for 56 degrees of freedom
# Null hypothesis probability = 4.825578e-01
Photon flux (15-150 keV) in 1 sec: 0.450860 ( -0.166532 0.17289 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.47205e-08 ( -1.38549e-08 1.72473e-08 ) ergs/cm2
Band function
Time interval is from -0.304 sec. to 0.696 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.52449 ( -8.46498 -2.52412 )
beta : -2.49056 ( 2.49467 1.43775 )
Epeak [keV] : 53.6495 ( -22.6768 178.562 )
Norm@50keV : 0.416045 ( -0.413373 7.04803 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.73 using 59 PHA bins.
# Reduced chi-squared = 1.013 for 55 degrees of freedom
# Null hypothesis probability = 4.472030e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.67354e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.9971 (-4.42883 7.11118)
R^2/D10^2 : 5.11794E-02 (-0.0511794 0.104527)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.83 using 59 PHA bins.
# Reduced chi-squared = 0.9795 for 57 degrees of freedom
# Null hypothesis probability = 5.190041e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.708e-09 1.717e-09
25- 50 1.139e-08 6.840e-09
50-150 2.038e-08 1.322e-08
15-150 3.448e-08 2.233e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-120.137 -199.363)
Norm : 2.06071 (-0.684911 0.684926)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.87 using 59 PHA bins.
# Reduced chi-squared = 1.033 for 57 degrees of freedom
# Null hypothesis probability = 4.070100e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.131e-09 3.204e-09
25- 50 9.871e-09 5.870e-09
50-150 2.165e-08 1.336e-08
15-150 3.665e-08 2.222e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 200.000 (-200 -200)
R1^2/D10^2 : 1.39702E-05 (-1.39703e-05 -1.39703e-05)
kT2 [keV] : 15.2576 (-5.23598 7.76329)
R2^2/D10^2 : 5.76838E-02 (-0.0431069 0.0962912)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.82 using 59 PHA bins.
#Fit statistic : Chi-Squared = 55.77 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 55 degrees of freedom
# Reduced chi-squared = 1.014 for 55 degrees of freedom
# Null hypothesis probability = 4.439765e-01
# Null hypothesis probability = 4.454959e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.810e-09 1.075e-06
25- 50 1.137e-08 9.320e-06
50-150 2.065e-08 2.423e-04
15-150 3.483e-08 2.795e-04
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: 1.21318 ( -0.355286 0.344386 )
Norm@50keV : 9.49449E-03 ( -0.00214829 0.00214826 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.08 using 59 PHA bins.
# Reduced chi-squared = 0.9488 for 57 degrees of freedom
# Null hypothesis probability = 5.853443e-01
Photon flux (15-150 keV) in 0.436 sec: 1.11645 ( -0.258162 0.259584 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.18533e-08 ( -1.01445e-08 1.03271e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.42172 ( -3.13905 1.91298 )
Epeak [keV] : 64.5728 ( -15.0655 44.3646 )
Norm@50keV : 0.194169 ( -0.194397 7.10639 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.79 using 59 PHA bins.
# Reduced chi-squared = 0.8534 for 56 degrees of freedom
# Null hypothesis probability = 7.743365e-01
Photon flux (15-150 keV) in 0.436 sec: 1.02237 ( -0.256329 0.26505 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.5133e-08 ( -1.00853e-08 1.12195e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5.06433 -5 )
beta : -2.08022 ( -1.61782 0.679792 )
Epeak [keV] : 43.7526 ( -10.2384 10.4837 )
Norm@50keV : 36.2672 ( -7.60195 132.185 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.58 using 59 PHA bins.
# Reduced chi-squared = 0.8469 for 55 degrees of freedom
# Null hypothesis probability = 7.833085e-01
Photon flux (15-150 keV) in 0.436 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.7883e-08 ( -3.78799e-08 -1.03773e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 8.86e-09
S(50-100 keV) = 1.53e-08
T90 vs. Hardness ratio plot
T90 = 0.384000033140182 sec.
Hardness ratio (energy fluence ratio) = 1.72686
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 2.29118
Count Ratio (50-100 keV) / (15-25 keV) = 1.81062
Mask shadow pattern
IMX = -0.177306549307, IMY = -0.477271609489
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:
-299.440000 -0.024000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.6357 35.3113 6.1 30.9 54.0 0.5186 1.9 8.9 Her X-1
193.7842 -25.8736 3.6 59.0 -166.1 3.6435 3.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.024000 0.412000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4352 35.1870 3.2 30.7 54.2 0.0340 3.5 9.4 Her X-1
241.9926 11.2491 1.7 27.0 110.4 0.0617 7.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
57.860600 302.623500
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9876 -15.6395 0.2 27.1 157.5 14.5617 63.3 0.5 Sco X-1
254.4229 35.3361 3.9 26.6 7.0 0.6577 3.0 1.7 Her X-1
255.8291 -37.9457 5.6 50.9 149.8 2.0013 2.1 9.6 4U 1700-377
256.2326 -36.5529 7.9 49.7 148.9 -1.3456 -1.5 12.5 GX 349+2
262.8749 -24.7042 437.2 41.3 134.5 0.0168 0.0 7.7 GX 1+4
268.3923 -1.4291 2.0 29.2 98.1 1.9094 5.8 2.0 SW J1753.5-0127
263.0030 -33.8867 10.8 49.4 140.8 1.0971 1.1 3.2 GX 354-0
240.3320 14.7985 2.8 3.9 -40.5 0.7885 4.1 ------ UNKNOWN
243.7354 26.4257 2.9 15.2 -10.2 0.7488 4.0 ------ UNKNOWN
Plot creation:
Thu Oct 8 20:43:11 EDT 2015