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
339.9611 -40.1464 0.0113 49.2996 -164.5106 1.4683001 17.108 TRIG_00330856
Foreground time interval of the image:
-8.672 6.816 (delta_t = 15.488 [sec])
Background time interval of the image:
-204.403 -198.624 (delta_t = 5.779 [sec])
-197.904 -8.672 (delta_t = 189.232 [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 -8.672 sec. to 6.816 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.42622 ( -0.187765 0.201096 )
Norm@50keV : 5.00489E-03 ( -0.000690974 0.000679807 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.96 using 59 PHA bins.
# Reduced chi-squared = 0.7186 for 57 degrees of freedom
# Null hypothesis probability = 9.460893e-01
Photon flux (15-150 keV) in 15.49 sec: 0.940439 ( -0.0870259 0.0870972 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.60863e-07 ( -8.08085e-08 8.24153e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.672 sec. to 6.816 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51960 ( -1.10084 0.480412 )
Epeak [keV] : 20.1390 ( )
Norm@50keV : 1.77689E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.36 using 59 PHA bins.
# Reduced chi-squared = 0.6672 for 56 degrees of freedom
# Null hypothesis probability = 9.738823e-01
Photon flux (15-150 keV) in 15.49 sec: 0.908206 ( -0.091486 0.091534 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.02512e-07 ( -8.93401e-08 9.56074e-08 ) ergs/cm2
Band function
Time interval is from -8.672 sec. to 6.816 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.537572 ( -1.7844 2.6452 )
beta : -2.91754 ( 2.90916 0.453441 )
Epeak [keV] : 25.3331 ( -7.88335 5.77028 )
Norm@50keV : 8.52660E-02 ( -0.0775336 6.7199 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.81 using 59 PHA bins.
# Reduced chi-squared = 0.6694 for 55 degrees of freedom
# Null hypothesis probability = 9.717856e-01
Photon flux (15-150 keV) in 15.49 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.12672e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.81409 (-0.762042 0.854695)
R^2/D10^2 : 1.10071 (-0.386513 0.592911)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.74 using 59 PHA bins.
# Reduced chi-squared = 0.8901 for 57 degrees of freedom
# Null hypothesis probability = 7.076794e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.849e-07 2.754e-08
25- 50 3.105e-07 3.857e-08
50-150 7.542e-08 2.354e-08
15-150 5.709e-07 7.288e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 36.5182 (-7.46505 10.1161)
Norm : 6.40499 (-1.1492 1.4689)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.44 using 59 PHA bins.
# Reduced chi-squared = 0.6568 for 57 degrees of freedom
# Null hypothesis probability = 9.789709e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.205e-07 2.703e-08
25- 50 2.784e-07 3.005e-08
50-150 1.944e-07 5.463e-08
15-150 6.932e-07 8.155e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.97742 (-1.4739 1.16828)
R1^2/D10^2 : 2.66430 (-1.28471 4.52105)
kT2 [keV] : 18.0850 (-6.29185 12.5633)
R2^2/D10^2 : 1.80663E-02 (-0.0159421 0.116989)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.15 using 59 PHA bins.
# Reduced chi-squared = 0.6754 for 55 degrees of freedom
# Null hypothesis probability = 9.690118e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.132e-07 6.840e-08
25- 50 2.777e-07 1.121e-07
50-150 2.192e-07 1.238e-07
15-150 7.101e-07 2.611e-07
Peak spectrum fit
Power-law model
Time interval is from 0.652 sec. to 1.652 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.20364 ( -0.241434 0.265146 )
Norm@50keV : 1.73202E-02 ( -0.00293752 0.00281943 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.67 using 59 PHA bins.
# Reduced chi-squared = 1.170 for 57 degrees of freedom
# Null hypothesis probability = 1.786188e-01
Photon flux (15-150 keV) in 1 sec: 2.87292 ( -0.36028 0.360812 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62927e-07 ( -2.33419e-08 2.37262e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.652 sec. to 1.652 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98568 ( )
Epeak [keV] : 3.10850 ( )
Norm@50keV : 2.26230E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.88 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 56 degrees of freedom
# Null hypothesis probability = 1.514796e-01
Photon flux (15-150 keV) in 1 sec: 2.87372 ( -0.37008 0.35523 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62833e-07 ( -2.5115e-08 2.3708e-08 ) ergs/cm2
Band function
Time interval is from 0.652 sec. to 1.652 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.85753 ( 1.85721 1.85721 )
beta : -2.20358 ( 2.20361 0.241627 )
Epeak [keV] : 5.16558 ( -5.12653 -5.12653 )
Norm@50keV : 3.95025E-02 ( -0.022304 2.69759 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.67 using 59 PHA bins.
# Reduced chi-squared = 1.212 for 55 degrees of freedom
# Null hypothesis probability = 1.345690e-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] : 9.30796 (-1.44316 1.68551)
R^2/D10^2 : 1.66916 (-0.801063 1.58581)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.07 using 59 PHA bins.
# Reduced chi-squared = 1.528 for 57 degrees of freedom
# Null hypothesis probability = 6.327508e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.862e-08 6.525e-09
25- 50 6.407e-08 1.077e-08
50-150 2.707e-08 9.280e-09
15-150 1.197e-07 2.293e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 53.6402 (-16.1167 27.3278)
Norm : 15.4360 (-3.18233 4.39259)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.02 using 59 PHA bins.
# Reduced chi-squared = 1.211 for 57 degrees of freedom
# Null hypothesis probability = 1.319963e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.832e-08 6.250e-09
25- 50 5.638e-08 8.305e-09
50-150 5.840e-08 1.896e-08
15-150 1.531e-07 2.460e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.25168 (-1.81754 1.8482)
R1^2/D10^2 : 29.5165 (-24.0399 536.308)
kT2 [keV] : 16.2476 (-4.79462 10.8142)
R2^2/D10^2 : 0.143397 (-0.123486 0.35451)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.59 using 59 PHA bins.
# Reduced chi-squared = 1.247 for 55 degrees of freedom
# Null hypothesis probability = 1.029487e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.360e-08 2.322e-08
25- 50 4.858e-08 2.304e-08
50-150 6.197e-08 3.687e-08
15-150 1.542e-07 7.614e-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: 2.42622 ( -0.187765 0.201096 )
Norm@50keV : 5.00489E-03 ( -0.000690974 0.000679807 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.96 using 59 PHA bins.
# Reduced chi-squared = 0.7186 for 57 degrees of freedom
# Null hypothesis probability = 9.460893e-01
Photon flux (15-150 keV) in 15.49 sec: 0.940439 ( -0.0870259 0.0870972 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.60863e-07 ( -8.08085e-08 8.24153e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51960 ( -1.10084 0.480412 )
Epeak [keV] : 20.1390 ( )
Norm@50keV : 1.77689E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.36 using 59 PHA bins.
# Reduced chi-squared = 0.6672 for 56 degrees of freedom
# Null hypothesis probability = 9.738823e-01
Photon flux (15-150 keV) in 15.49 sec: 0.908206 ( -0.091486 0.091534 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.02512e-07 ( -8.93401e-08 9.56074e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.537572 ( -2.12678 2.64441 )
beta : -2.91754 ( 2.90916 0.453441 )
Epeak [keV] : 25.3331 ( -7.88335 5.77028 )
Norm@50keV : 8.52660E-02 ( -0.0775336 6.7199 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.81 using 59 PHA bins.
# Reduced chi-squared = 0.6694 for 55 degrees of freedom
# Null hypothesis probability = 9.717856e-01
Photon flux (15-150 keV) in 15.49 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.12672e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 2.50e-07
S(50-100 keV) = 1.86e-07
T90 vs. Hardness ratio plot
T90 = 9.72799998521805 sec.
Hardness ratio (energy fluence ratio) = 0.744
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.19717
Count Ratio (50-100 keV) / (15-25 keV) = 0.403531
Mask shadow pattern
IMX = -1.120363818542023E+00, IMY = 3.104811782056601E-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:
-204.403400 -198.624100
-197.904000 -8.672000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5884 35.1993 1.1 49.6 -41.1 6.9985 10.7 0.2 Cyg X-1
308.2395 41.0346 4.0 46.2 -29.9 0.9518 2.9 7.6 Cyg X-3
326.0271 38.2538 4.5 34.3 -18.4 0.4569 2.6 7.9 Cyg X-2
25.3825 -0.0702 2.0 40.4 110.3 3.2867 5.7 ------ UNKNOWN
2.7588 39.6345 2.4 34.3 33.2 0.9805 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-8.672000 6.816000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5741 35.2181 7.0 49.6 -41.1 -0.2487 -1.6 1.3 Cyg X-1
308.2714 40.9547 5.3 46.1 -30.0 -0.1829 -2.2 7.3 Cyg X-3
326.0207 38.2735 4.8 34.4 -18.4 -0.1136 -2.4 7.7 Cyg X-2
21.5633 -22.6317 2.2 47.1 142.2 0.8246 5.3 ------ UNKNOWN
11.8276 -8.1490 2.8 31.0 132.1 0.2286 4.0 ------ UNKNOWN
339.9611 -40.1464 0.7 49.3 -164.5 1.4683 17.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
87.596590 962.124100
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
284.9661 -25.0707 12.0 47.9 -40.7 1.6641 1.0 9.8 HT1900.1-2455
52.8020 -77.2770 3.3 47.3 -148.1 3.4553 3.5 ------ UNKNOWN
Plot creation:
Sun May 31 06:09:13 EDT 2015