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
291.3767 -35.1404 0.0026 36.6142 -48.5428 12.8687436 75.085 TRIG_00436429
Foreground time interval of the image:
-5.488 12.405 (delta_t = 17.893 [sec])
Background time interval of the image:
-87.795 -5.488 (delta_t = 82.307 [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)
The mask-weighted light curves based on cleaned DPHs
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 -5.488 sec. to 130.568 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42713 ( -0.030278 0.0302075 )
Norm@50keV : 1.33772E-02 ( -0.000214991 0.000214654 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.02 using 59 PHA bins.
# Reduced chi-squared = 0.6319 for 57 degrees of freedom
# Null hypothesis probability = 9.865024e-01
Photon flux (15-150 keV) in 136.1 sec: 1.63941 ( -0.031373 0.0314961 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74976e-05 ( -2.73818e-07 2.73855e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.488 sec. to 130.568 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42362 ( )
Epeak [keV] : 9999.99 ( )
Norm@50keV : 1.34227E-02 ( -0.000215035 0.000208628 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.98 using 59 PHA bins.
# Reduced chi-squared = 0.6424 for 56 degrees of freedom
# Null hypothesis probability = 9.828119e-01
Photon flux (15-150 keV) in 136.1 sec: 1.63401 ( -0.02877 0.03474 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74541e-05 ( -2.76691e-07 3.20379e-07 ) ergs/cm2
Band function
Time interval is from -5.488 sec. to 130.568 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.493232 ( 0.915504 5.8696 )
beta : -1.44426 ( -0.773623 0.0427149 )
Epeak [keV] : 49.1722 ( -49.1795 174.541 )
Norm@50keV : 5.48758E-02 ( -0.0548315 709.259 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.47 using 59 PHA bins.
# Reduced chi-squared = 0.6086 for 55 degrees of freedom
# Null hypothesis probability = 9.903499e-01
Photon flux (15-150 keV) in 136.1 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] : 19.5521 ( )
R^2/D10^2 : 7.26192E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 890.06 using 59 PHA bins.
# Reduced chi-squared = 15.615 for 57 degrees of freedom
# Null hypothesis probability = 6.690086e-150
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.348e-07 2.613e-08
25- 50 3.605e-06 9.459e-08
50-150 1.018e-05 2.361e-07
15-150 1.452e-05 2.450e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 6.94484 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 154.68 using 59 PHA bins.
# Reduced chi-squared = 2.7137 for 57 degrees of freedom
# Null hypothesis probability = 5.887692e-11
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.354e-06 4.287e-08
25- 50 4.528e-06 8.234e-08
50-150 9.930e-06 1.858e-07
15-150 1.681e-05 3.062e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.66415 (-0.544395 0.576045)
R1^2/D10^2 : 0.778635 (-0.147071 0.19079)
kT2 [keV] : 34.0804 (-2.31092 2.86622)
R2^2/D10^2 : 8.92801E-03 (-0.00210801 0.00244532)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.98 using 59 PHA bins.
# Reduced chi-squared = 1.054 for 55 degrees of freedom
# Null hypothesis probability = 3.659596e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.720e-06 1.007e-07
25- 50 4.352e-06 1.313e-07
50-150 1.120e-05 3.641e-07
15-150 1.728e-05 4.491e-07
Peak spectrum fit
Power-law model
Time interval is from 2.580 sec. to 3.580 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09646 ( -0.075028 0.0748746 )
Norm@50keV : 8.02229E-02 ( -0.00345279 0.00345226 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.28 using 59 PHA bins.
# Reduced chi-squared = 0.9347 for 57 degrees of freedom
# Null hypothesis probability = 6.155339e-01
Photon flux (15-150 keV) in 1 sec: 9.30216 ( -0.409251 0.409525 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.39698e-07 ( -4.03225e-08 4.04299e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.580 sec. to 3.580 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.706629 ( -0.310236 0.29027 )
Epeak [keV] : 191.833 ( -60.0286 345.224 )
Norm@50keV : 0.119514 ( -0.0299849 0.0428076 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.89 using 59 PHA bins.
# Reduced chi-squared = 0.8551 for 56 degrees of freedom
# Null hypothesis probability = 7.713113e-01
Photon flux (15-150 keV) in 1 sec: 9.15548 ( -0.42247 0.42265 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.27242e-07 ( -4.2201e-08 4.2072e-08 ) ergs/cm2
Band function
Time interval is from 2.580 sec. to 3.580 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.706515 ( -0.22881 0.328143 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 191.760 ( -59.9722 345.313 )
Norm@50keV : 0.119525 ( -0.030036 0.0427917 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.89 using 59 PHA bins.
# Reduced chi-squared = 0.8707 for 55 degrees of freedom
# Null hypothesis probability = 7.406721e-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] : 21.1862 ( )
R^2/D10^2 : 0.371171 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 130.11 using 59 PHA bins.
# Reduced chi-squared = 2.2826 for 57 degrees of freedom
# Null hypothesis probability = 1.215812e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.136e-08 2.570e-09
25- 50 1.621e-07 9.650e-09
50-150 5.425e-07 3.785e-08
15-150 7.360e-07 3.895e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 37.8443 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 149.26 using 59 PHA bins.
# Reduced chi-squared = 2.6186 for 57 degrees of freedom
# Null hypothesis probability = 3.388591e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.424e-08 4.595e-09
25- 50 1.813e-07 8.750e-09
50-150 3.976e-07 2.075e-08
15-150 6.731e-07 3.480e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.06178 (-1.20601 1.4093)
R1^2/D10^2 : 6.23824 (-2.802 5.88838)
kT2 [keV] : 29.7346 (-3.01533 4.05097)
R2^2/D10^2 : 0.110712 (-0.0383038 0.0479093)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.55 using 59 PHA bins.
# Reduced chi-squared = 0.7554 for 55 degrees of freedom
# Null hypothesis probability = 9.099141e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.583e-08 1.482e-08
25- 50 1.649e-07 2.115e-08
50-150 6.051e-07 6.505e-08
15-150 8.358e-07 9.560e-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: 1.19077 ( -0.0330796 0.0329668 )
Norm@50keV : 4.96817E-02 ( -0.000899266 0.000897249 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.83 using 59 PHA bins.
# Reduced chi-squared = 0.6988 for 57 degrees of freedom
# Null hypothesis probability = 9.591727e-01
Photon flux (15-150 keV) in 17.89 sec: 5.82416 ( -0.115356 0.115632 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.04096e-06 ( -1.61418e-07 1.61489e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.13022 ( -0.132776 0.072091 )
Epeak [keV] : 885.843 ( -886.056 -886.056 )
Norm@50keV : 5.26041E-02 ( -0.00127659 0.0068331 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.20 using 59 PHA bins.
# Reduced chi-squared = 0.7001 for 56 degrees of freedom
# Null hypothesis probability = 9.569346e-01
Photon flux (15-150 keV) in 17.89 sec: 5.82673 ( -0.1416 0.11055 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.02481e-06 ( -1.67307e-07 1.6423e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.04462 ( -3.06922 -0.719754 )
beta : -1.20685 ( -0.0389498 0.0369423 )
Epeak [keV] : 35.2324 ( -10.2805 72.0031 )
Norm@50keV : 2.06148 ( -2.07478 1228.66 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.07 using 59 PHA bins.
# Reduced chi-squared = 0.6559 for 55 degrees of freedom
# Null hypothesis probability = 9.772996e-01
Photon flux (15-150 keV) in 17.89 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) = 4.17e-06
S(50-100 keV) = 6.20e-06
T90 vs. Hardness ratio plot
T90 = 72.2319999337196 sec.
Hardness ratio (energy fluence ratio) = 1.48681
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.49777
Count Ratio (50-100 keV) / (15-25 keV) = 1.2572
Mask shadow pattern
IMX = 4.919435740203281E-01, IMY = 5.568786709476784E-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:
-87.795410 -5.488000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
285.1561 -24.9888 7.2 46.0 -38.5 -0.3362 -1.6 7.7 HT1900.1-2455
342.8159 -34.6587 2.3 6.5 90.3 0.4205 5.0 ------ UNKNOWN
284.9946 -78.8026 3.2 44.2 -117.9 1.3695 3.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-5.488000 12.404590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
285.0548 -24.7574 6.8 46.2 -38.3 -0.4890 -1.7 9.8 HT1900.1-2455
9.5546 -29.1200 3.4 28.2 127.2 0.4029 3.4 ------ UNKNOWN
9.2486 -63.3341 2.8 30.1 -158.6 0.4787 4.1 ------ UNKNOWN
299.2617 -17.3331 2.4 40.0 -17.9 0.7685 4.8 ------ UNKNOWN
20.4876 -68.3878 2.4 36.7 -155.4 0.6419 4.7 ------ UNKNOWN
291.3767 -35.1404 0.2 36.6 -48.5 12.8686 75.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
70.004590 154.470900
155.304000 962.343300
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
256.0341 -37.8469 2.3 28.4 -98.6 3.5538 5.0 2.3 4U 1700-377
256.4912 -36.4742 3.0 28.2 -95.7 2.8566 3.8 4.1 GX 349+2
262.9807 -24.7623 1.9 26.6 -67.4 3.6888 6.0 1.8 GX 1+4
264.8649 -44.5009 6.2 22.3 -115.5 1.0415 1.9 6.0 4U 1735-44
268.3402 -1.4844 2.5 39.9 -30.2 3.4539 4.5 2.5 SW J1753.5-0127
270.3341 -25.1828 3.7 20.7 -59.6 1.5960 3.2 6.8 GX 5-1
270.2710 -25.8413 3.1 20.4 -61.3 1.9082 3.8 6.1 GRS 1758-258
274.0008 -14.0405 2.6 26.3 -33.6 2.2527 4.4 0.4 GX 17+2
275.9202 -30.3191 2.3 13.9 -66.6 2.6344 5.1 2.9 H1820-303
285.0808 -24.9133 3.7 11.6 -22.4 1.5817 3.1 2.5 HT1900.1-2455
288.7901 10.9466 0.9 46.1 3.8 14.3785 13.0 0.5 GRS 1915+105
262.9511 -33.8002 2.0 23.4 -87.6 3.6134 5.7 2.8 GX 354-0
319.1765 2.8422 3.5 46.0 47.7 10.1798 3.3 ------ UNKNOWN
332.5738 -60.3626 3.0 36.4 154.1 3.7187 3.9 ------ UNKNOWN
284.5344 -0.7623 3.8 35.0 -4.6 2.1275 3.0 ------ UNKNOWN
267.0142 -24.8491 2.1 23.4 -63.2 3.5441 5.6 ------ UNKNOWN
255.1966 -41.6395 1.9 28.9 -106.6 4.5468 5.9 ------ UNKNOWN
Plot creation:
Sat May 30 23:40:45 EDT 2015