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
286.2613 3.8982 0.0040 19.6060 98.8981 8.4291169 47.386 TRIG_00601259
Foreground time interval of the image:
-6.668 80.133 (delta_t = 86.801 [sec])
Background time interval of the image:
-239.568 -6.668 (delta_t = 232.900 [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 -6.668 sec. to 105.708 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57164 ( -0.0551148 0.0551292 )
Norm@50keV : 5.61037E-03 ( -0.000163483 0.00016344 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.98 using 59 PHA bins.
# Reduced chi-squared = 0.7365 for 57 degrees of freedom
# Null hypothesis probability = 9.318548e-01
Photon flux (15-150 keV) in 112.4 sec: 0.714769 ( -0.0228938 0.0229657 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.91888e-06 ( -1.81614e-07 1.81937e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.668 sec. to 105.708 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34655 ( -0.223677 0.212427 )
Epeak [keV] : 152.917 ( -50.9763 1285.8 )
Norm@50keV : 7.17862E-03 ( -0.0014515 0.00193368 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.70 using 59 PHA bins.
# Reduced chi-squared = 0.6911 for 56 degrees of freedom
# Null hypothesis probability = 9.621912e-01
Photon flux (15-150 keV) in 112.4 sec: 0.703093 ( -0.025161 0.025249 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.81914e-06 ( -2.06175e-07 2.05445e-07 ) ergs/cm2
Band function
Time interval is from -6.668 sec. to 105.708 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.292421 ( -0.603703 3.64548 )
beta : -1.66756 ( -0.110164 0.0909054 )
Epeak [keV] : 45.9430 ( -27.1757 56.7854 )
Norm@50keV : 3.45294E-02 ( -0.025671 6.76888 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.48 using 59 PHA bins.
# Reduced chi-squared = 0.6269 for 55 degrees of freedom
# Null hypothesis probability = 9.863104e-01
Photon flux (15-150 keV) in 112.4 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] : 15.4417 ( )
R^2/D10^2 : 6.89951E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 284.06 using 59 PHA bins.
# Reduced chi-squared = 4.9836 for 57 degrees of freedom
# Null hypothesis probability = 6.934096e-32
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.852e-07 2.310e-08
25- 50 1.571e-06 5.957e-08
50-150 2.582e-06 1.551e-07
15-150 4.538e-06 1.383e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 2.88121 (-0.0835916 0.0835916)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.96 using 59 PHA bins.
# Reduced chi-squared = 0.6835 for 57 degrees of freedom
# Null hypothesis probability = 9.675525e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.071e-07 2.546e-08
25- 50 1.552e-06 5.170e-08
50-150 3.404e-06 1.124e-07
15-150 5.764e-06 1.916e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.95746 (-0.761133 0.799535)
R1^2/D10^2 : 0.496276 (-0.132293 0.198336)
kT2 [keV] : 29.7703 (-3.49736 4.88531)
R2^2/D10^2 : 5.27664E-03 (-0.00213554 0.00300672)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.70 using 59 PHA bins.
# Reduced chi-squared = 0.6672 for 55 degrees of freedom
# Null hypothesis probability = 9.727326e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.188e-07 7.014e-08
25- 50 1.611e-06 9.385e-08
50-150 3.475e-06 4.384e-07
15-150 5.805e-06 4.822e-07
Peak spectrum fit
Power-law model
Time interval is from 0.452 sec. to 1.452 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36070 ( -0.24083 0.238919 )
Norm@50keV : 1.13530E-02 ( -0.00155638 0.00155407 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.35 using 59 PHA bins.
# Reduced chi-squared = 0.9535 for 57 degrees of freedom
# Null hypothesis probability = 5.750773e-01
Photon flux (15-150 keV) in 1 sec: 1.37076 ( -0.193123 0.1938 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10619e-07 ( -1.6653e-08 1.68149e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.452 sec. to 1.452 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22063 ( -1.09239 1.0076 )
Epeak [keV] : 288.472 ( -288.474 -288.474 )
Norm@50keV : 1.33174E-02 ( -0.0064706 0.0313104 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.29 using 59 PHA bins.
# Reduced chi-squared = 0.9694 for 56 degrees of freedom
# Null hypothesis probability = 5.400198e-01
Photon flux (15-150 keV) in 1 sec: 1.36290 ( -0.2005 0.19443 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09627e-07 ( -1.84073e-08 1.7637e-08 ) ergs/cm2
Band function
Time interval is from 0.452 sec. to 1.452 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.973177 ( 0.845384 0.845384 )
beta : -1.55096 ( 1.39443 0.271664 )
Epeak [keV] : 127.275 ( -65.8559 -65.8559 )
Norm@50keV : 1.79685E-02 ( -0.00749059 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.13 using 59 PHA bins.
# Reduced chi-squared = 0.9841 for 55 degrees of freedom
# Null hypothesis probability = 5.079528e-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] : 16.4536 (-2.65233 3.41564)
R^2/D10^2 : 0.115833 (-0.0554434 0.0979286)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.25 using 59 PHA bins.
# Reduced chi-squared = 1.145 for 57 degrees of freedom
# Null hypothesis probability = 2.119207e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.441e-09 1.754e-09
25- 50 2.775e-08 6.380e-09
50-150 5.306e-08 1.429e-08
15-150 8.725e-08 1.736e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 5.68741 (-0.780277 0.780204)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.16 using 59 PHA bins.
# Reduced chi-squared = 0.9852 for 57 degrees of freedom
# Null hypothesis probability = 5.067076e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.417e-08 8.005e-09
25- 50 2.725e-08 1.521e-08
50-150 5.977e-08 3.318e-08
15-150 1.012e-07 5.615e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.88984 (-2.96881 8.9677)
R1^2/D10^2 : 2.12621 (-1.75938 39.4692)
kT2 [keV] : 23.6879 (-6.72768 -23.9097)
R2^2/D10^2 : 2.87537E-02 (-0.0237378 0.0325664)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.94 using 59 PHA bins.
# Reduced chi-squared = 1.017 for 55 degrees of freedom
# Null hypothesis probability = 4.392125e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.242e-08 7.031e-09
25- 50 2.503e-08 1.312e-08
50-150 6.728e-08 3.786e-08
15-150 1.047e-07 5.377e-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: 1.57378 ( -0.0555342 0.0555337 )
Norm@50keV : 6.19097E-03 ( -0.000182844 0.000182788 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.50 using 59 PHA bins.
# Reduced chi-squared = 0.8508 for 57 degrees of freedom
# Null hypothesis probability = 7.813022e-01
Photon flux (15-150 keV) in 86.8 sec: 0.789244 ( -0.025491 0.0255657 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.04239e-06 ( -1.56993e-07 1.57277e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34188 ( -0.224155 0.212977 )
Epeak [keV] : 148.492 ( -48.2991 752.355 )
Norm@50keV : 7.99489E-03 ( -0.00163225 0.00217582 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.02 using 59 PHA bins.
# Reduced chi-squared = 0.8040 for 56 degrees of freedom
# Null hypothesis probability = 8.530881e-01
Photon flux (15-150 keV) in 86.8 sec: 0.776297 ( -0.027867 0.027952 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.95395e-06 ( -1.78461e-07 1.77367e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.77175E-02 ( -1.00173 3.99149 )
beta : -1.67457 ( -0.100512 0.0861141 )
Epeak [keV] : 43.1573 ( -15.239 33.898 )
Norm@50keV : 5.22455E-02 ( -0.0563808 71.8466 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.16 using 59 PHA bins.
# Reduced chi-squared = 0.7120 for 55 degrees of freedom
# Null hypothesis probability = 9.474400e-01
Photon flux (15-150 keV) in 86.8 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) = 1.51e-06
S(50-100 keV) = 2.04e-06
T90 vs. Hardness ratio plot
T90 = 93.2519999742508 sec.
Hardness ratio (energy fluence ratio) = 1.35099
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.39739
Count Ratio (50-100 keV) / (15-25 keV) = 0.962842
Mask shadow pattern
IMX = -5.509643130575773E-02, IMY = -3.519150614601779E-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:
-239.568000 -6.668000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4422 35.3122 3.1 45.2 172.5 1.8697 3.8 2.0 Her X-1
268.5133 -1.4530 5.8 37.1 112.6 1.2532 2.0 8.7 SW J1753.5-0127
288.7846 10.9476 0.5 13.4 113.9 4.8847 22.3 0.8 GRS 1915+105
299.5841 35.1925 0.3 18.2 -134.7 7.9308 33.6 0.6 Cyg X-1
308.0295 41.0247 2.4 24.7 -118.1 1.2852 4.7 5.7 Cyg X-3
326.0985 38.1495 20.3 30.4 -89.7 0.2156 0.6 10.9 Cyg X-2
278.7557 31.9587 3.0 25.1 179.9 0.8886 3.9 ------ UNKNOWN
239.6087 46.8764 2.9 58.3 -175.6 5.8618 4.0 ------ UNKNOWN
257.4068 66.4393 2.6 57.0 -149.9 7.7890 4.5 ------ UNKNOWN
313.6099 60.9798 2.5 44.8 -122.1 4.6116 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-6.668000 80.132600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5110 35.2098 5.6 45.1 172.4 -0.5985 -2.1 8.4 Her X-1
268.2628 -1.3859 5.3 37.2 112.9 0.8676 2.2 7.5 SW J1753.5-0127
288.7805 10.8548 599.0 13.5 113.6 -0.0030 -0.0 5.5 GRS 1915+105
299.8493 35.2200 0.0 18.2 -134.0 0.0992 0.7 12.7 Cyg X-1
308.1072 40.9564 46.2 24.7 -117.9 -0.0421 -0.2 0.3 Cyg X-3
326.3219 38.2492 13.4 30.6 -89.6 0.1964 0.9 8.3 Cyg X-2
303.3699 -10.7029 2.8 27.8 44.5 0.7966 4.1 ------ UNKNOWN
286.2613 3.8982 0.2 19.6 98.9 8.4294 47.4 ------ UNKNOWN
312.3193 60.4282 2.2 44.1 -122.8 2.7964 5.3 ------ UNKNOWN
329.6114 52.2549 2.6 41.8 -104.7 2.6299 4.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
197.532640 962.512000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
355.2773 30.2835 3.0 29.4 140.0 2.2768 3.8 ------ UNKNOWN
22.3500 6.6407 3.4 13.8 38.2 1.4636 3.4 ------ UNKNOWN
49.6352 -11.0558 2.4 38.9 -15.7 2.7002 4.9 ------ UNKNOWN
36.3600 29.6926 3.0 13.6 -114.2 1.7521 3.8 ------ UNKNOWN
14.5686 78.4593 5.1 58.7 -159.2 9.8118 2.3 ------ UNKNOWN
Plot creation:
Sat May 30 13:23:10 EDT 2015