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
170.8546 28.9692 0.0255 12.9818 -130.5169 0.1131700 7.530 TRIG_00219646
Foreground time interval of the image:
-0.224 2.776 (delta_t = 3.000 [sec])
Background time interval of the image:
-239.224 -0.224 (delta_t = 239.000 [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
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
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 -0.224 sec. to 2.776 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66342 ( -0.340055 0.362037 )
Norm@50keV : 2.35983E-03 ( -0.00054713 0.000531052 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.20 using 59 PHA bins.
# Reduced chi-squared = 1.249 for 57 degrees of freedom
# Null hypothesis probability = 9.775051e-02
Photon flux (15-150 keV) in 3 sec: 0.309513 ( -0.0617288 0.061732 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.57573e-08 ( -1.57552e-08 1.64019e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.224 sec. to 2.776 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.396484 ( -2.75703 1.71503 )
Epeak [keV] : 53.8295 ( -16.0283 -53.8259 )
Norm@50keV : 1.24052E-02 ( -0.0124108 0.48101 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.65 using 59 PHA bins.
# Reduced chi-squared = 1.244 for 56 degrees of freedom
# Null hypothesis probability = 1.038365e-01
Photon flux (15-150 keV) in 3 sec: 0.295697 ( -0.064454 0.064615 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.75403e-08 ( -1.63596e-08 1.96368e-08 ) ergs/cm2
Band function
Time interval is from -0.224 sec. to 2.776 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.362968 ( -0.666391 4.07869 )
beta : -2.42618 ( 2.42595 0.957586 )
Epeak [keV] : 45.2431 ( -44.0202 28.8299 )
Norm@50keV : 3.77028E-02 ( -0.0369047 115.67 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.34 using 59 PHA bins.
# Reduced chi-squared = 1.261 for 55 degrees of freedom
# Null hypothesis probability = 9.237834e-02
Photon flux (15-150 keV) in 3 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.95872e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.6488 (-2.26374 2.98065)
R^2/D10^2 : 8.76443E-02 (-0.0496546 0.104562)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.25 using 59 PHA bins.
# Reduced chi-squared = 1.250 for 57 degrees of freedom
# Null hypothesis probability = 9.711358e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.523e-09 2.856e-09
25- 50 2.285e-08 7.837e-09
50-150 1.827e-08 9.288e-09
15-150 4.864e-08 1.588e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 126.212 (-66.5803 -124.334)
Norm : 1.31581 (-0.286321 0.410887)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.30 using 59 PHA bins.
# Reduced chi-squared = 1.233 for 57 degrees of freedom
# Null hypothesis probability = 1.109756e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.026e-08 5.799e-09
25- 50 1.851e-08 1.052e-08
50-150 3.385e-08 2.281e-08
15-150 6.262e-08 3.823e-08
Double BB
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.96 using 59 PHA bins.
#Fit statistic : Chi-Squared = 69.44 using 59 PHA bins.
#Fit statistic : Chi-Squared = 69.42 using 59 PHA bins.
#Fit statistic : Chi-Squared = 69.40 using 59 PHA bins.
# Reduced chi-squared = 1.272 for 55 degrees of freedom
# Reduced chi-squared = 1.263 for 55 degrees of freedom
# Reduced chi-squared = 1.262 for 55 degrees of freedom
# Reduced chi-squared = 1.262 for 55 degrees of freedom
# Null hypothesis probability = 8.427236e-02
# Null hypothesis probability = 9.107295e-02
# Null hypothesis probability = 9.130785e-02
# Null hypothesis probability = 9.156452e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.922e-09 4.515e-09
25- 50 2.103e-08 1.208e-08
50-150 2.141e-08 1.416e-08
15-150 5.136e-08 2.637e-08
Peak spectrum fit
Power-law model
Time interval is from 0.776 sec. to 1.776 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86176 ( -0.331047 0.366829 )
Norm@50keV : 3.65040E-03 ( -0.000954378 0.000931508 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.99 using 59 PHA bins.
# Reduced chi-squared = 1.210 for 57 degrees of freedom
# Null hypothesis probability = 1.326098e-01
Photon flux (15-150 keV) in 1 sec: 0.515560 ( -0.108024 0.108067 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.35538e-08 ( -8.49226e-09 8.89484e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.776 sec. to 1.776 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.771391 ( -2.87206 1.85938 )
Epeak [keV] : 43.8607 ( -8.60403 13.5996 )
Norm@50keV : 0.119270 ( -0.139205 5.2081 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.88 using 59 PHA bins.
# Reduced chi-squared = 1.105 for 56 degrees of freedom
# Null hypothesis probability = 2.742545e-01
Photon flux (15-150 keV) in 1 sec: 0.492203 ( -0.106068 0.106754 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.89305e-08 ( -6.8772e-09 8.036e-09 ) ergs/cm2
Band function
Time interval is from 0.776 sec. to 1.776 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.789496 ( -1.8093 2.91743 )
beta : -9.37167 ( 9.37167 19.3714 )
Epeak [keV] : 43.9255 ( -8.8273 13.2582 )
Norm@50keV : 0.118819 ( -0.1265 5.19514 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.92 using 59 PHA bins.
# Reduced chi-squared = 1.126 for 55 degrees of freedom
# Null hypothesis probability = 2.429531e-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] : 11.1669 (-1.96109 2.34484)
R^2/D10^2 : 0.180799 (-0.0926487 0.186122)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.94 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 57 degrees of freedom
# Null hypothesis probability = 3.044374e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.724e-09 1.906e-09
25- 50 1.362e-08 4.453e-09
50-150 9.702e-09 4.688e-09
15-150 2.804e-08 8.790e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 73.7367 (-31.4099 85.2343)
Norm : 2.56268 (-0.648482 0.853604)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.79 using 59 PHA bins.
# Reduced chi-squared = 1.154 for 57 degrees of freedom
# Null hypothesis probability = 1.986889e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.608e-09 2.209e-09
25- 50 1.066e-08 3.913e-09
50-150 1.422e-08 1.051e-08
15-150 3.149e-08 1.399e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.27981 (-3.46045 -3.46045)
R1^2/D10^2 : 4.47252 (-3.87654 -3.87654)
kT2 [keV] : 11.9035 (-2.52157 -11.9987)
R2^2/D10^2 : 0.134473 (-0.130023 0.200681)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.21 using 59 PHA bins.
# Reduced chi-squared = 1.113 for 55 degrees of freedom
# Null hypothesis probability = 2.629369e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.452e-09 2.805e-09
25- 50 1.283e-08 7.400e-09
50-150 1.064e-08 6.735e-09
15-150 2.892e-08 1.641e-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: 1.66342 ( -0.340055 0.362037 )
Norm@50keV : 2.35983E-03 ( -0.00054713 0.000531052 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.20 using 59 PHA bins.
# Reduced chi-squared = 1.249 for 57 degrees of freedom
# Null hypothesis probability = 9.775051e-02
Photon flux (15-150 keV) in 3 sec: 0.309513 ( -0.0617288 0.061732 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.57573e-08 ( -1.57552e-08 1.64019e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.396484 ( -2.75703 1.71503 )
Epeak [keV] : 53.8295 ( -16.0283 -53.8259 )
Norm@50keV : 1.24052E-02 ( -0.0124108 0.48101 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.65 using 59 PHA bins.
# Reduced chi-squared = 1.244 for 56 degrees of freedom
# Null hypothesis probability = 1.038365e-01
Photon flux (15-150 keV) in 3 sec: 0.295697 ( -0.064454 0.064615 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.75403e-08 ( -1.63596e-08 1.96368e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.362968 ( -0.666391 4.07868 )
beta : -2.42618 ( 2.42595 0.957586 )
Epeak [keV] : 45.2431 ( -44.0202 28.8299 )
Norm@50keV : 3.77028E-02 ( -0.0369047 115.67 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.34 using 59 PHA bins.
# Reduced chi-squared = 1.261 for 55 degrees of freedom
# Null hypothesis probability = 9.237834e-02
Photon flux (15-150 keV) in 3 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.95872e-08 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.75e-08
S(50-100 keV) = 2.21e-08
T90 vs. Hardness ratio plot
T90 = 3 sec.
Hardness ratio (energy fluence ratio) = 1.26286
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.47277
Count Ratio (50-100 keV) / (15-25 keV) = 0.740353
Mask shadow pattern
IMX = -1.497713022709813E-01, IMY = 1.752550698408311E-01
TIME vs. PHA plot around the trigger time
TIME vs. DetID plot around the trigger time
100 us light curve (15-350 keV)
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:
-239.224000 -0.224000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
198.2285 -11.8471 2.9 49.3 148.0 2.6543 4.0 ------ UNKNOWN
188.1816 3.5067 2.7 32.3 158.7 0.9280 4.3 ------ UNKNOWN
166.1888 38.1875 2.0 14.5 -88.0 0.9531 5.9 ------ UNKNOWN
121.8879 56.3594 2.9 46.0 -56.6 3.3401 4.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.224000 2.776000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.8546 28.9692 1.5 13.0 -130.5 0.1132 7.5 ------ UNKNOWN
99.9677 73.9814 2.9 54.4 -33.4 0.3014 4.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
113.076590 125.676600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.0217 -15.6685 1.0 19.1 101.4 0.4420 11.8 3.0 Sco X-1
254.4791 35.4268 7.4 48.9 10.4 0.1428 1.5 5.2 Her X-1
256.1329 -37.8305 4.9 40.4 126.3 0.2177 2.4 7.0 4U 1700-377
256.5278 -36.5477 22.6 39.8 124.5 0.0483 0.5 8.7 GX 349+2
263.0074 -24.7644 35.5 38.2 103.8 0.0384 0.3 1.1 GX 1+4
268.3683 -1.3748 4.8 40.7 65.9 -0.3075 -2.4 4.7 SW J1753.5-0127
233.7346 -45.2038 2.3 39.0 154.9 0.2773 4.9 ------ UNKNOWN
219.7494 -25.5851 2.5 20.6 -177.2 0.1370 4.6 ------ UNKNOWN
235.9023 51.3323 1.9 58.3 -12.7 1.1707 6.2 ------ UNKNOWN
178.9688 -22.8464 2.4 49.8 -133.0 0.7344 4.7 ------ UNKNOWN
Plot creation:
Sun May 31 12:35:49 EDT 2015