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
254.2420 -30.8131 0.0041 27.1172 27.0588 2.6306663 47.362 TRIG_00192152
Foreground time interval of the image:
-7.000 5.524 (delta_t = 12.524 [sec])
Background time interval of the image:
-254.019 -7.000 (delta_t = 247.019 [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 -7.000 sec. to 5.524 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47468 ( -0.0639856 0.0638907 )
Norm@50keV : 1.34234E-02 ( -0.000440381 0.000440381 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.52 using 59 PHA bins.
# Reduced chi-squared = 0.6934 for 57 degrees of freedom
# Null hypothesis probability = 9.623276e-01
Photon flux (15-150 keV) in 12.52 sec: 1.66461 ( -0.0608318 0.0610555 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60112e-06 ( -5.54716e-08 5.56587e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.000 sec. to 5.524 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47180 ( -0.120403 0.0922751 )
Epeak [keV] : 9999.17 ( )
Norm@50keV : 1.34653E-02 ( -0.00044185 0.00181053 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.57 using 59 PHA bins.
# Reduced chi-squared = 0.7066 for 56 degrees of freedom
# Null hypothesis probability = 9.527663e-01
Photon flux (15-150 keV) in 12.52 sec: 1.66437 ( -0.06134 0.06031 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60079e-06 ( -5.46623e-08 5.61146e-08 ) ergs/cm2
Band function
Time interval is from -7.000 sec. to 5.524 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.11087 ( 1.11058 1.11058 )
beta : -1.47546 ( 1.47546 0.0645227 )
Epeak [keV] : 48.7279 ( -48.6777 -48.6777 )
Norm@50keV : 2.70098E-02 ( -0.0140772 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.52 using 59 PHA bins.
# Reduced chi-squared = 0.7185 for 55 degrees of freedom
# Null hypothesis probability = 9.427378e-01
Photon flux (15-150 keV) in 12.52 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] : 17.5882 ( )
R^2/D10^2 : 0.103855 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 294.61 using 59 PHA bins.
# Reduced chi-squared = 5.1686 for 57 degrees of freedom
# Null hypothesis probability = 9.600149e-34
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.112e-08 5.747e-09
25- 50 3.686e-07 1.784e-08
50-150 8.225e-07 4.507e-08
15-150 1.272e-06 5.039e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 6.85228 (-0.22566 0.225625)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.69 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 57 degrees of freedom
# Null hypothesis probability = 4.496957e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.137e-07 7.888e-09
25- 50 4.111e-07 1.496e-08
50-150 9.015e-07 3.280e-08
15-150 1.526e-06 5.509e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.94216 (-0.725981 0.803765)
R1^2/D10^2 : 1.84268 (-0.601592 0.956248)
kT2 [keV] : 30.1720 (-3.0677 4.121)
R2^2/D10^2 : 1.39204E-02 (-0.00481176 0.00620396)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.97 using 59 PHA bins.
# Reduced chi-squared = 0.7631 for 55 degrees of freedom
# Null hypothesis probability = 9.017451e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.018e-07 2.141e-08
25- 50 3.916e-07 3.130e-08
50-150 1.020e-06 1.008e-07
15-150 1.613e-06 1.058e-07
Peak spectrum fit
Power-law model
Time interval is from 3.008 sec. to 4.008 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.953140 ( -0.11875 0.116588 )
Norm@50keV : 2.50310E-02 ( -0.00170011 0.00169254 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.06 using 59 PHA bins.
# Reduced chi-squared = 0.9835 for 57 degrees of freedom
# Null hypothesis probability = 5.102824e-01
Photon flux (15-150 keV) in 1 sec: 2.87611 ( -0.197685 0.198157 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.75312e-07 ( -1.93733e-08 1.9392e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.008 sec. to 4.008 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.559664 ( -0.513367 0.432654 )
Epeak [keV] : 223.427 ( -92.2531 -223.427 )
Norm@50keV : 3.65100E-02 ( -0.0121395 0.0217738 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.91 using 59 PHA bins.
# Reduced chi-squared = 0.9626 for 56 degrees of freedom
# Null hypothesis probability = 5.545491e-01
Photon flux (15-150 keV) in 1 sec: 2.82557 ( -0.2058 0.20624 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.71923e-07 ( -2.0153e-08 2.0039e-08 ) ergs/cm2
Band function
Time interval is from 3.008 sec. to 4.008 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -0.970826 ( -0.117586 0.120468 )
Epeak [keV] : 23.3947 ( -19.7045 46.7974 )
Norm@50keV : 2379.40 ( -154.804 3.81437e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.19 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 55 degrees of freedom
# Null hypothesis probability = 4.674530e-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] : 24.2593 (-2.11318 2.40231)
R^2/D10^2 : 7.73844E-02 (-0.0194403 0.0252171)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.35 using 59 PHA bins.
# Reduced chi-squared = 1.410 for 57 degrees of freedom
# Null hypothesis probability = 2.248787e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.037e-09 1.129e-09
25- 50 4.489e-08 4.625e-09
50-150 1.966e-07 1.910e-08
15-150 2.495e-07 1.930e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 11.8309 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 126.97 using 59 PHA bins.
# Reduced chi-squared = 2.2276 for 57 degrees of freedom
# Null hypothesis probability = 3.029174e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.946e-08 2.525e-09
25- 50 5.667e-08 8.000e-09
50-150 1.243e-07 3.763e-08
15-150 2.104e-07 3.880e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.76883 (-2.04817 3.17474)
R1^2/D10^2 : 1.89403 (-1.33882 5.59174)
kT2 [keV] : 30.9447 (-4.2909 7.69816)
R2^2/D10^2 : 3.34873E-02 (-0.0172911 0.0125835)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.37 using 59 PHA bins.
# Reduced chi-squared = 0.9522 for 55 degrees of freedom
# Null hypothesis probability = 5.757267e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.837e-08 8.266e-09
25- 50 4.797e-08 1.294e-08
50-150 2.078e-07 4.020e-08
15-150 2.742e-07 4.715e-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: 1.47468 ( -0.0639856 0.0638907 )
Norm@50keV : 1.34234E-02 ( -0.000440381 0.000440381 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.52 using 59 PHA bins.
# Reduced chi-squared = 0.6934 for 57 degrees of freedom
# Null hypothesis probability = 9.623276e-01
Photon flux (15-150 keV) in 12.52 sec: 1.66461 ( -0.0608318 0.0610555 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60112e-06 ( -5.54716e-08 5.56587e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47180 ( -0.120403 0.0922751 )
Epeak [keV] : 9999.17 ( )
Norm@50keV : 1.34653E-02 ( -0.00044185 0.00181053 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.57 using 59 PHA bins.
# Reduced chi-squared = 0.7066 for 56 degrees of freedom
# Null hypothesis probability = 9.527663e-01
Photon flux (15-150 keV) in 12.52 sec: 1.66437 ( -0.06134 0.06031 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60079e-06 ( -5.46623e-08 5.61146e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.11087 ( 1.11058 1.11058 )
beta : -1.47546 ( 1.47546 0.0645227 )
Epeak [keV] : 48.7279 ( -48.6777 -48.6777 )
Norm@50keV : 2.70098E-02 ( -0.0140772 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.52 using 59 PHA bins.
# Reduced chi-squared = 0.7185 for 55 degrees of freedom
# Null hypothesis probability = 9.427378e-01
Photon flux (15-150 keV) in 12.52 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) = 3.91e-07
S(50-100 keV) = 5.63e-07
T90 vs. Hardness ratio plot
T90 = 10.3600000143051 sec.
Hardness ratio (energy fluence ratio) = 1.4399
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.32044
Count Ratio (50-100 keV) / (15-25 keV) = 1.0411
Mask shadow pattern
IMX = 4.560496767471577E-01, IMY = -2.329586767562424E-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:
-254.019410 -7.000000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9863 -15.6529 0.5 23.8 67.5 9.5413 22.3 0.9 Sco X-1
254.5214 35.3496 4.6 43.8 166.0 1.2774 2.5 3.2 Her X-1
255.9630 -37.8141 1.7 32.8 18.4 2.6669 6.8 2.1 4U 1700-377
256.5883 -36.5833 5.3 31.5 18.4 0.8236 2.2 12.1 GX 349+2
263.0277 -24.7834 6.4 18.6 14.3 0.4769 1.8 2.5 GX 1+4
264.7424 -44.4504 69.0 37.8 4.6 -0.0706 -0.2 0.0 4U 1735-44
268.5183 -1.4832 9.2 5.3 -168.0 0.3505 1.3 9.2 SW J1753.5-0127
270.3048 -25.0776 2.9 18.5 -6.5 1.0231 4.0 1.1 GX 5-1
270.2680 -25.7874 7.3 19.2 -6.1 0.4126 1.6 3.2 GRS 1758-258
274.0592 -13.8951 4.9 9.6 -39.9 0.6440 2.3 9.0 GX 17+2
275.9692 -30.2937 3.8 24.9 -16.1 0.8480 3.0 5.0 H1820-303
284.8982 -24.9693 3.4 24.7 -39.0 0.9919 3.4 8.1 HT1900.1-2455
288.8172 10.9149 1.1 27.6 -128.3 3.2875 10.2 2.1 GRS 1915+105
299.5863 35.2024 1.1 51.7 -145.1 7.8246 10.3 0.2 Cyg X-1
262.9097 -33.9827 35.2 27.6 9.7 0.1053 0.3 9.7 GX 354-0
233.8925 -23.5960 2.3 36.4 60.1 3.5379 5.0 ------ UNKNOWN
255.2011 -41.6188 2.0 36.6 16.9 2.4160 5.7 ------ UNKNOWN
259.0190 49.9164 2.0 57.1 174.9 9.2007 5.9 ------ UNKNOWN
282.0096 7.5560 2.8 20.3 -133.1 1.0690 4.2 ------ UNKNOWN
311.0056 -50.5345 2.5 56.7 -30.1 6.9023 4.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-7.000000 5.524000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9637 -15.5448 8.6 23.8 67.7 0.0763 1.3 5.8 Sco X-1
254.4950 35.4672 80.2 43.9 166.0 -0.0116 -0.1 7.7 Her X-1
255.9342 -37.7092 3.6 32.7 18.5 -0.1776 -3.2 8.5 4U 1700-377
256.5974 -36.3804 10.5 31.3 18.5 0.0548 1.1 8.2 GX 349+2
263.0922 -24.8715 9.3 18.6 14.1 0.0542 1.2 8.8 GX 1+4
264.5748 -44.3943 16.2 37.8 4.8 -0.0479 -0.7 7.9 4U 1735-44
268.2225 -1.6061 0.0 5.2 -171.0 0.0890 2.2 12.7 SW J1753.5-0127
270.4438 -25.1508 5.2 18.6 -6.9 0.0925 2.2 9.7 GX 5-1
270.2120 -25.8306 5.6 19.3 -5.9 -0.0883 -2.0 7.2 GRS 1758-258
274.0342 -14.1843 9.7 9.8 -38.7 -0.0500 -1.2 9.0 GX 17+2
275.7742 -30.5292 0.0 25.0 -15.6 -0.0844 -1.9 12.5 H1820-303
285.0659 -24.7699 15.2 24.6 -39.6 0.0350 0.8 9.2 HT1900.1-2455
288.9474 10.9119 4.8 27.7 -128.1 -0.1242 -2.4 9.0 GRS 1915+105
299.6817 35.0380 4.2 51.6 -144.8 -0.3687 -2.8 10.8 Cyg X-1
262.9699 -33.6848 4.7 27.3 9.7 0.1230 2.5 9.0 GX 354-0
254.2419 -30.8131 0.2 27.1 27.1 2.6309 47.4 ------ UNKNOWN
290.2044 49.4603 4.1 59.6 -161.7 0.6662 2.8 ------ UNKNOWN
304.0631 30.3868 2.8 51.0 -137.3 0.7637 4.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
130.780590 302.250000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9770 -15.6226 0.9 48.0 -1.8 4.6785 12.5 1.1 Sco X-1
254.5317 35.3945 2.4 11.0 -107.6 0.7721 4.9 4.8 Her X-1
268.3566 -1.5872 3.3 42.2 -39.4 0.9342 3.5 8.1 SW J1753.5-0127
210.2569 30.9443 3.2 26.8 97.8 0.9486 3.6 ------ UNKNOWN
330.5658 74.1730 3.0 58.7 -159.2 3.7844 3.9 ------ UNKNOWN
287.6088 24.1895 2.2 40.8 -88.3 3.1507 5.3 ------ UNKNOWN
Plot creation:
Sun May 31 14:05:00 EDT 2015