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
338.2912 -15.2778 0.0050 38.1579 -120.5873 8.0844562 38.487 TRIG_00449542
Foreground time interval of the image:
-12.988 10.604 (delta_t = 23.592 [sec])
Background time interval of the image:
-119.368 -12.988 (delta_t = 106.380 [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 -12.988 sec. to 10.604 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57966 ( -0.0543272 0.0545001 )
Norm@50keV : 2.30839E-02 ( -0.000700819 0.000700376 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.31 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 57 degrees of freedom
# Null hypothesis probability = 4.271114e-01
Photon flux (15-150 keV) in 23.59 sec: 2.94800 ( -0.0950736 0.0952705 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.10575e-06 ( -1.641e-07 1.64416e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -12.988 sec. to 10.604 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06002 ( -0.24068 0.22854 )
Epeak [keV] : 94.6469 ( -14.8382 33.3747 )
Norm@50keV : 4.10066E-02 ( -0.00894936 0.0121905 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.29 using 59 PHA bins.
# Reduced chi-squared = 0.7553 for 56 degrees of freedom
# Null hypothesis probability = 9.122141e-01
Photon flux (15-150 keV) in 23.59 sec: 2.85282 ( -0.10247 0.10277 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.92965e-06 ( -1.82657e-07 1.82209e-07 ) ergs/cm2
Band function
Time interval is from -12.988 sec. to 10.604 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.04792 ( -0.250076 2.95979 )
beta : -2.21812 ( 2.15205 0.486307 )
Epeak [keV] : 93.2389 ( -46.2466 35.4039 )
Norm@50keV : 4.16010E-02 ( -0.0102608 1.93756 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.24 using 59 PHA bins.
# Reduced chi-squared = 0.7680 for 55 degrees of freedom
# Null hypothesis probability = 8.963549e-01
Photon flux (15-150 keV) in 23.59 sec: 2.84901 ( 4.15099 -0.10307 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.9623e-06 ( -4.96213e-06 -1.75863e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.3122 ( )
R^2/D10^2 : 0.301057 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 229.96 using 59 PHA bins.
# Reduced chi-squared = 4.0343 for 57 degrees of freedom
# Null hypothesis probability = 1.233898e-22
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.474e-07 2.064e-08
25- 50 1.406e-06 5.579e-08
50-150 2.264e-06 1.302e-07
15-150 4.018e-06 1.368e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 198.074 ( )
Norm : 11.9348 (-0.366169 0.443555)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.38 using 59 PHA bins.
# Reduced chi-squared = 0.7786 for 57 degrees of freedom
# Null hypothesis probability = 8.885721e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.012e-07 2.701e-08
25- 50 1.348e-06 4.895e-08
50-150 2.954e-06 1.109e-07
15-150 5.004e-06 2.100e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.13381 (-0.790498 0.867345)
R1^2/D10^2 : 2.68154 (-0.840208 1.34136)
kT2 [keV] : 24.2567 (-2.21953 2.94666)
R2^2/D10^2 : 4.57876E-02 (-0.0163396 0.0209046)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.18 using 59 PHA bins.
# Reduced chi-squared = 0.7306 for 55 degrees of freedom
# Null hypothesis probability = 9.330840e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.394e-07 7.584e-08
25- 50 1.375e-06 9.412e-08
50-150 2.876e-06 2.949e-07
15-150 4.890e-06 4.057e-07
Peak spectrum fit
Power-law model
Time interval is from 1.952 sec. to 2.952 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14082 ( -0.0886128 0.0881721 )
Norm@50keV : 6.90058E-02 ( -0.00391032 0.00390986 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.10 using 59 PHA bins.
# Reduced chi-squared = 1.090 for 57 degrees of freedom
# Null hypothesis probability = 2.993223e-01
Photon flux (15-150 keV) in 1 sec: 8.03886 ( -0.466357 0.466706 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.12344e-07 ( -4.37765e-08 4.38779e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.952 sec. to 2.952 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.153751 ( -0.43872 0.399573 )
Epeak [keV] : 104.324 ( -16.6057 33.5978 )
Norm@50keV : 0.197971 ( -0.0670203 0.112108 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.09 using 59 PHA bins.
# Reduced chi-squared = 0.7516 for 56 degrees of freedom
# Null hypothesis probability = 9.159247e-01
Photon flux (15-150 keV) in 1 sec: 7.86536 ( -0.47121 0.47258 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.91303e-07 ( -4.6156e-08 4.5998e-08 ) ergs/cm2
Band function
Time interval is from 1.952 sec. to 2.952 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.156249 ( -0.367166 0.417764 )
beta : -9.37123 ( 9.37162 19.3716 )
Epeak [keV] : 104.483 ( -10.9457 33.2815 )
Norm@50keV : 0.197380 ( -0.06319 0.0443967 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.09 using 59 PHA bins.
# Reduced chi-squared = 0.7652 for 55 degrees of freedom
# Null hypothesis probability = 8.994400e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.88829e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 19.5729 (-1.26839 1.37907)
R^2/D10^2 : 0.428366 (-0.086404 0.106045)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.40 using 59 PHA bins.
# Reduced chi-squared = 1.217 for 57 degrees of freedom
# Null hypothesis probability = 1.255776e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.190e-08 3.470e-09
25- 50 1.566e-07 1.260e-08
50-150 4.434e-07 3.945e-08
15-150 6.319e-07 4.215e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 33.0030 (-1.92471 1.92456)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 110.71 using 59 PHA bins.
# Reduced chi-squared = 1.9423 for 57 degrees of freedom
# Null hypothesis probability = 2.646406e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.216e-08 5.155e-09
25- 50 1.580e-07 1.250e-08
50-150 3.466e-07 6.065e-08
15-150 5.868e-07 8.140e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.70454 (-2.30968 3.05187)
R1^2/D10^2 : 2.47343 (-1.2759 3.53967)
kT2 [keV] : 26.8703 (-3.86702 8.0035)
R2^2/D10^2 : 0.122841 (-0.0782776 0.0558699)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.57 using 59 PHA bins.
# Reduced chi-squared = 0.7377 for 55 degrees of freedom
# Null hypothesis probability = 9.269406e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.064e-08 1.855e-08
25- 50 1.593e-07 4.048e-08
50-150 4.844e-07 1.533e-07
15-150 6.943e-07 1.869e-07
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: 1.57966 ( -0.0543272 0.0545001 )
Norm@50keV : 2.30839E-02 ( -0.000700819 0.000700376 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.31 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 57 degrees of freedom
# Null hypothesis probability = 4.271114e-01
Photon flux (15-150 keV) in 23.59 sec: 2.94800 ( -0.0950736 0.0952705 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.10575e-06 ( -1.641e-07 1.64416e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06002 ( -0.24068 0.22854 )
Epeak [keV] : 94.6469 ( -14.8382 33.3747 )
Norm@50keV : 4.10066E-02 ( -0.00894936 0.0121905 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.29 using 59 PHA bins.
# Reduced chi-squared = 0.7553 for 56 degrees of freedom
# Null hypothesis probability = 9.122141e-01
Photon flux (15-150 keV) in 23.59 sec: 2.85282 ( -0.10247 0.10277 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.92965e-06 ( -1.82657e-07 1.82209e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.04792 ( -0.250076 2.95979 )
beta : -2.21812 ( 2.15205 0.486307 )
Epeak [keV] : 93.2389 ( -46.2466 35.4039 )
Norm@50keV : 4.16010E-02 ( -0.0102608 1.68371 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.24 using 59 PHA bins.
# Reduced chi-squared = 0.7680 for 55 degrees of freedom
# Null hypothesis probability = 8.963549e-01
Photon flux (15-150 keV) in 23.59 sec: 2.84901 ( 4.15099 -0.10307 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.9623e-06 ( -4.96213e-06 -1.75863e-07 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.31e-06
S(50-100 keV) = 1.75e-06
T90 vs. Hardness ratio plot
T90 = 15.9599999189377 sec.
Hardness ratio (energy fluence ratio) = 1.33588
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.52755
Count Ratio (50-100 keV) / (15-25 keV) = 1.18105
Mask shadow pattern
IMX = -3.998211337545512E-01, IMY = 6.764018492904426E-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:
-119.368000 -12.988000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
295.6474 -28.0400 2.8 51.3 -178.1 2.8793 4.1 ------ UNKNOWN
325.3212 -35.5352 3.1 27.6 -160.0 1.0536 3.8 ------ UNKNOWN
54.3635 -18.8135 4.0 54.4 -12.8 2.3929 2.9 ------ UNKNOWN
357.0201 -21.6230 2.8 28.4 -90.7 1.5780 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-12.988000 10.604000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
79.1049 -47.7674 2.5 50.7 31.8 1.6849 4.6 ------ UNKNOWN
75.3951 -45.5836 2.4 49.9 27.6 1.3677 4.7 ------ UNKNOWN
338.2912 -15.2778 0.3 38.2 -120.6 8.0845 38.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
317.332600 962.662000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6300 22.0225 0.9 55.4 4.5 25.0710 12.4 0.5 Crab
135.5198 -40.6373 3.9 37.4 125.9 2.9582 3.0 5.0 Vela X-1
101.4164 -11.4698 2.8 24.4 41.0 1.8315 4.1 ------ UNKNOWN
161.6433 -78.4922 3.6 54.1 177.1 4.8547 3.2 ------ UNKNOWN
73.7522 -35.7445 2.7 12.9 -95.2 1.7182 4.4 ------ UNKNOWN
58.5543 -29.0967 2.7 26.4 -78.8 2.3858 4.2 ------ UNKNOWN
57.0157 -38.4502 4.1 26.4 -100.1 1.5898 2.8 ------ UNKNOWN
Plot creation:
Sat May 30 22:43:30 EDT 2015