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
178.6643 7.8297 0.0070 20.4890 -77.7437 2.6596604 27.645 TRIG_00353627
Foreground time interval of the image:
-25.540 34.608 (delta_t = 60.148 [sec])
Background time interval of the image:
-438.075 -367.137 (delta_t = 70.938 [sec])
-239.176 -25.540 (delta_t = 213.636 [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 -25.540 sec. to 34.608 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57751 ( -0.0945779 0.0954326 )
Norm@50keV : 2.90584E-03 ( -0.000162333 0.00016157 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.83 using 59 PHA bins.
# Reduced chi-squared = 1.295 for 57 degrees of freedom
# Null hypothesis probability = 6.619858e-02
Photon flux (15-150 keV) in 60.15 sec: 0.370860 ( -0.0198914 0.0199082 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.63927e-06 ( -9.94809e-08 1.00266e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -25.540 sec. to 34.608 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.940168 ( -0.44592 0.402528 )
Epeak [keV] : 78.6192 ( -15.5616 53.3341 )
Norm@50keV : 6.26852E-03 ( -0.00236953 0.00438042 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.13 using 59 PHA bins.
# Reduced chi-squared = 1.181 for 56 degrees of freedom
# Null hypothesis probability = 1.667281e-01
Photon flux (15-150 keV) in 60.15 sec: 0.358634 ( -0.021247 0.021241 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5403e-06 ( -1.16071e-07 1.1722e-07 ) ergs/cm2
Band function
Time interval is from -25.540 sec. to 34.608 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.378892 ( -1.55966 -0.390955 )
beta : -1.81425 ( 1.81333 0.179183 )
Epeak [keV] : 41.6345 ( -12.4299 55.7959 )
Norm@50keV : 4.89563E-02 ( -0.0525705 59.1906 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.26 using 59 PHA bins.
# Reduced chi-squared = 1.168 for 55 degrees of freedom
# Null hypothesis probability = 1.838707e-01
Photon flux (15-150 keV) in 60.15 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.57138e-06 ( -1.57096e-06 -1.09419e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.4481 ( )
R^2/D10^2 : 6.04325E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 118.70 using 59 PHA bins.
# Reduced chi-squared = 2.0825 for 57 degrees of freedom
# Null hypothesis probability = 3.121783e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.393e-07 1.447e-08
25- 50 4.972e-07 3.308e-08
50-150 5.796e-07 6.956e-08
15-150 1.216e-06 7.398e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 173.175 (-42.4699 -173.109)
Norm : 1.51894 (-0.086522 0.0940814)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.75 using 59 PHA bins.
# Reduced chi-squared = 1.189 for 57 degrees of freedom
# Null hypothesis probability = 1.558844e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.314e-07 1.886e-08
25- 50 4.375e-07 6.917e-08
50-150 9.134e-07 3.384e-07
15-150 1.582e-06 4.042e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.66933 (-1.44747 1.55444)
R1^2/D10^2 : 0.284734 (-0.11797 0.254524)
kT2 [keV] : 24.9602 (-5.02939 10.1103)
R2^2/D10^2 : 4.76930E-03 (-0.00336468 0.00378412)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.84 using 59 PHA bins.
# Reduced chi-squared = 1.179 for 55 degrees of freedom
# Null hypothesis probability = 1.710475e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.073e-07 3.726e-08
25- 50 4.624e-07 8.204e-08
50-150 8.792e-07 3.872e-07
15-150 1.549e-06 4.493e-07
Peak spectrum fit
Power-law model
Time interval is from 9.292 sec. to 10.292 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16674 ( -0.206217 0.202274 )
Norm@50keV : 1.06700E-02 ( -0.00128525 0.00128524 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.37 using 59 PHA bins.
# Reduced chi-squared = 1.392 for 57 degrees of freedom
# Null hypothesis probability = 2.674567e-02
Photon flux (15-150 keV) in 1 sec: 1.24690 ( -0.153268 0.153474 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09294e-07 ( -1.46481e-08 1.47869e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 9.292 sec. to 10.292 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.691532 ( -0.947169 0.574971 )
Epeak [keV] : 144.539 ( -65.546 -144.546 )
Norm@50keV : 1.82115E-02 ( -0.00834362 0.032882 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.34 using 59 PHA bins.
# Reduced chi-squared = 1.399 for 56 degrees of freedom
# Null hypothesis probability = 2.603401e-02
Photon flux (15-150 keV) in 1 sec: 1.22641 ( -0.15755 0.15732 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0588e-07 ( -1.61636e-08 1.5972e-08 ) ergs/cm2
Band function
Time interval is from 9.292 sec. to 10.292 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.94883 ( -3.46331 -3.46331 )
beta : -1.36370 ( -0.336094 0.286754 )
Epeak [keV] : 33.8919 ( -34.7436 76.5697 )
Norm@50keV : 33.2861 ( -33.289 46.3757 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.67 using 59 PHA bins.
# Reduced chi-squared = 1.394 for 55 degrees of freedom
# Null hypothesis probability = 2.831987e-02
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] : 18.0989 (-2.72942 3.37566)
R^2/D10^2 : 8.10049E-02 (-0.0349423 0.0583998)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.96 using 59 PHA bins.
# Reduced chi-squared = 1.561 for 57 degrees of freedom
# Null hypothesis probability = 4.309332e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.303e-09 1.200e-09
25- 50 2.463e-08 4.445e-09
50-150 5.864e-08 1.426e-08
15-150 8.857e-08 1.605e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 5.11237 (-0.630347 0.630326)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.80 using 59 PHA bins.
# Reduced chi-squared = 1.540 for 57 degrees of freedom
# Null hypothesis probability = 5.465321e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.273e-08 7.195e-09
25- 50 2.449e-08 1.361e-08
50-150 5.372e-08 2.958e-08
15-150 9.094e-08 5.060e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.3051 (-3.65465 4.06111)
R1^2/D10^2 : 0.346599 (-0.207374 0.80117)
kT2 [keV] : 42.6258 (-18.7739 -42.6542)
R2^2/D10^2 : 3.91029E-03 (-0.00376704 0.0231978)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.75 using 59 PHA bins.
# Reduced chi-squared = 1.395 for 55 degrees of freedom
# Null hypothesis probability = 2.797157e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.443e-09 4.685e-09
25- 50 2.570e-08 1.359e-08
50-150 7.385e-08 3.920e-08
15-150 1.080e-07 5.249e-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: 1.57751 ( -0.0945779 0.0954326 )
Norm@50keV : 2.90584E-03 ( -0.000162333 0.00016157 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.83 using 59 PHA bins.
# Reduced chi-squared = 1.295 for 57 degrees of freedom
# Null hypothesis probability = 6.619858e-02
Photon flux (15-150 keV) in 60.15 sec: 0.370860 ( -0.0198914 0.0199082 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.63927e-06 ( -9.94809e-08 1.00266e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.940168 ( -0.44592 0.402528 )
Epeak [keV] : 78.6192 ( -15.5616 53.3341 )
Norm@50keV : 6.26852E-03 ( -0.00236953 0.00438042 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.13 using 59 PHA bins.
# Reduced chi-squared = 1.181 for 56 degrees of freedom
# Null hypothesis probability = 1.667281e-01
Photon flux (15-150 keV) in 60.15 sec: 0.358634 ( -0.021247 0.021241 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5403e-06 ( -1.16071e-07 1.1722e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.378892 ( -1.55966 -0.390955 )
beta : -1.81425 ( 1.81333 0.179183 )
Epeak [keV] : 41.6345 ( -12.4299 55.7959 )
Norm@50keV : 4.89563E-02 ( -0.0525705 59.1959 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.26 using 59 PHA bins.
# Reduced chi-squared = 1.168 for 55 degrees of freedom
# Null hypothesis probability = 1.838707e-01
Photon flux (15-150 keV) in 60.15 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.57138e-06 ( -1.57096e-06 -1.09419e-07 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 4.21e-07
S(50-100 keV) = 5.64e-07
T90 vs. Hardness ratio plot
T90 = 42.8000000119209 sec.
Hardness ratio (energy fluence ratio) = 1.33967
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.49321
Count Ratio (50-100 keV) / (15-25 keV) = 1.02081
Mask shadow pattern
IMX = 7.932345979961761E-02, IMY = 3.651492954307809E-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:
-438.075400 -367.136900
-239.176000 -25.540000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-25.540000 34.608000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
229.8625 24.1943 2.5 46.0 18.7 0.8680 4.6 ------ UNKNOWN
179.9547 -24.1314 2.2 22.8 -174.3 0.4349 5.3 ------ UNKNOWN
178.6643 7.8296 0.4 20.5 -77.7 2.6584 27.6 ------ UNKNOWN
204.3238 43.5653 2.5 50.2 -19.5 0.8953 4.5 ------ UNKNOWN
184.8079 39.4252 2.2 46.0 -39.1 1.0527 5.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
440.224610 602.831900
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.6279 35.2012 0.0 21.4 50.2 -0.1354 -0.2 11.9 Her X-1
299.7430 35.2421 12.7 49.3 5.4 1.3320 0.9 7.9 Cyg X-1
307.9732 40.9227 160.9 50.9 -5.6 -0.0993 -0.1 6.5 Cyg X-3
251.7387 18.0653 3.4 35.2 73.2 4.6232 3.4 ------ UNKNOWN
211.9597 13.4373 4.4 40.5 137.6 4.0443 2.6 ------ UNKNOWN
266.0345 26.1085 3.0 34.6 46.0 3.5964 3.9 ------ UNKNOWN
193.2026 31.8436 3.3 34.8 178.4 2.5491 3.5 ------ UNKNOWN
176.8505 33.7211 2.6 43.9 -165.0 4.5238 4.4 ------ UNKNOWN
313.2996 49.6912 4.2 48.9 -17.8 3.5170 2.8 ------ UNKNOWN
318.8006 62.0239 2.5 45.5 -34.5 5.8746 4.7 ------ UNKNOWN
176.7217 73.1484 3.1 33.3 -101.6 4.2039 3.7 ------ UNKNOWN
153.8836 54.3627 3.1 46.3 -127.9 10.4695 3.7 ------ UNKNOWN
Plot creation:
Sun May 31 03:52:22 EDT 2015