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
245.6820 -56.5487 0.0109 37.9474 -154.3868 0.2336191 17.666 TRIG_00426438
Foreground time interval of the image:
-0.304 0.208 (delta_t = 0.512 [sec])
Background time interval of the image:
-239.152 -0.304 (delta_t = 238.848 [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 0.128000
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 0.128000
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 0.128000
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 -0.304 sec. to 0.208 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61129 ( -0.164235 0.16713 )
Norm@50keV : 3.00255E-02 ( -0.00294986 0.00293521 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.82 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 57 degrees of freedom
# Null hypothesis probability = 4.448277e-01
Photon flux (15-150 keV) in 0.512 sec: 3.87203 ( -0.384429 0.385574 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43578e-07 ( -1.49096e-08 1.50035e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.304 sec. to 0.208 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05686 ( -0.756448 0.618975 )
Epeak [keV] : 87.4958 ( -25.4394 -87.4958 )
Norm@50keV : 5.63749E-02 ( -0.0276931 0.0738906 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.73 using 59 PHA bins.
# Reduced chi-squared = 0.9951 for 56 degrees of freedom
# Null hypothesis probability = 4.852011e-01
Photon flux (15-150 keV) in 0.512 sec: 3.77065 ( -0.40053 0.40287 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.39134e-07 ( -1.60148e-08 1.59974e-08 ) ergs/cm2
Band function
Time interval is from -0.304 sec. to 0.208 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.05713 ( -0.551866 0.685621 )
beta : -10.0000 ( 10 5.32907e-15 )
Epeak [keV] : 87.5040 ( -23.1444 -87.504 )
Norm@50keV : 5.63513E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.73 using 59 PHA bins.
# Reduced chi-squared = 1.013 for 55 degrees of freedom
# Null hypothesis probability = 4.473230e-01
Photon flux (15-150 keV) in 0.512 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] : 14.8406 (-1.68709 1.91171)
R^2/D10^2 : 0.447732 (-0.157876 0.242706)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.57 using 59 PHA bins.
# Reduced chi-squared = 1.343 for 57 degrees of freedom
# Null hypothesis probability = 4.288587e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.059e-08 2.053e-09
25- 50 4.166e-08 5.187e-09
50-150 6.214e-08 1.097e-08
15-150 1.144e-07 1.408e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 172.201 (-60.7865 -172.137)
Norm : 15.8644 (-1.64597 1.90884)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.02 using 59 PHA bins.
# Reduced chi-squared = 0.9827 for 57 degrees of freedom
# Null hypothesis probability = 5.120347e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.058e-08 6.392e-09
25- 50 3.889e-08 1.696e-08
50-150 8.102e-08 4.481e-08
15-150 1.405e-07 6.597e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.79255 (-2.42525 2.87391)
R1^2/D10^2 : 4.19030 (-2.80056 17.2776)
kT2 [keV] : 22.9703 (-5.19825 12.2503)
R2^2/D10^2 : 7.33440E-02 (-0.0590332 0.132581)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.31 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 55 degrees of freedom
# Null hypothesis probability = 4.258442e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.899e-08 9.856e-09
25- 50 3.936e-08 1.888e-08
50-150 7.973e-08 4.187e-08
15-150 1.381e-07 5.651e-08
Peak spectrum fit
Power-law model
Time interval is from -0.516 sec. to 0.484 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60697 ( -0.187433 0.191008 )
Norm@50keV : 1.70820E-02 ( -0.00188121 0.00187159 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.36 using 59 PHA bins.
# Reduced chi-squared = 0.8836 for 57 degrees of freedom
# Null hypothesis probability = 7.205447e-01
Photon flux (15-150 keV) in 1 sec: 2.19988 ( -0.246775 0.247786 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.59619e-07 ( -1.85712e-08 1.87054e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.516 sec. to 0.484 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07685 ( -0.86723 0.653336 )
Epeak [keV] : 90.5219 ( -24.6063 -90.5219 )
Norm@50keV : 3.09733E-02 ( -0.0151285 0.0488058 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.89 using 59 PHA bins.
# Reduced chi-squared = 0.8731 for 56 degrees of freedom
# Null hypothesis probability = 7.385070e-01
Photon flux (15-150 keV) in 1 sec: 2.13935 ( -0.26055 0.26118 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.54814e-07 ( -2.0014e-08 1.9989e-08 ) ergs/cm2
Band function
Time interval is from -0.516 sec. to 0.484 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.07713 ( -0.457462 0.917644 )
beta : -10.0000 ( 10 1.77636e-14 )
Epeak [keV] : 90.5204 ( -27.1537 -90.5204 )
Norm@50keV : 3.09620E-02 ( -0.0151074 0.0488641 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.89 using 59 PHA bins.
# Reduced chi-squared = 0.8889 for 55 degrees of freedom
# Null hypothesis probability = 7.058653e-01
Photon flux (15-150 keV) in 1 sec: 2.13265 ( 4.86735 -0.25293 ) 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] : 15.2000 (-1.95453 2.24704)
R^2/D10^2 : 0.232135 (-0.0899352 0.147406)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.45 using 59 PHA bins.
# Reduced chi-squared = 1.148 for 57 degrees of freedom
# Null hypothesis probability = 2.070465e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.120e-08 2.446e-09
25- 50 4.506e-08 7.340e-09
50-150 7.126e-08 1.434e-08
15-150 1.275e-07 1.935e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 177.288 (-69.0755 -176.871)
Norm : 8.97516 (-1.02744 1.22793)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.09 using 59 PHA bins.
# Reduced chi-squared = 0.8612 for 57 degrees of freedom
# Null hypothesis probability = 7.627947e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.267e-08 1.254e-08
25- 50 4.299e-08 2.300e-08
50-150 9.054e-08 4.915e-08
15-150 1.562e-07 8.515e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.38559 (-2.48325 3.05426)
R1^2/D10^2 : 2.89540 (-2.08603 17.5613)
kT2 [keV] : 22.3315 (-4.93149 11.1771)
R2^2/D10^2 : 4.76912E-02 (-0.0377267 0.0471716)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.96 using 59 PHA bins.
# Reduced chi-squared = 0.8901 for 55 degrees of freedom
# Null hypothesis probability = 7.035549e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.144e-08 1.142e-08
25- 50 4.275e-08 1.808e-08
50-150 8.918e-08 4.797e-08
15-150 1.534e-07 6.813e-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: 1.61129 ( -0.164235 0.16713 )
Norm@50keV : 3.00255E-02 ( -0.00294986 0.00293521 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.82 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 57 degrees of freedom
# Null hypothesis probability = 4.448277e-01
Photon flux (15-150 keV) in 0.512 sec: 3.87203 ( -0.384429 0.385574 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43578e-07 ( -1.49096e-08 1.50035e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05686 ( -0.756448 0.618975 )
Epeak [keV] : 87.4958 ( -25.4394 -87.4958 )
Norm@50keV : 5.63749E-02 ( -0.0276931 0.0738906 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.73 using 59 PHA bins.
# Reduced chi-squared = 0.9951 for 56 degrees of freedom
# Null hypothesis probability = 4.852011e-01
Photon flux (15-150 keV) in 0.512 sec: 3.77065 ( -0.40053 0.40287 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.39134e-07 ( -1.60148e-08 1.59974e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.05713 ( -0.551866 0.685621 )
beta : -10.0000 ( 10 1.06581e-14 )
Epeak [keV] : 87.5040 ( -23.1444 -87.504 )
Norm@50keV : 5.63513E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.73 using 59 PHA bins.
# Reduced chi-squared = 1.013 for 55 degrees of freedom
# Null hypothesis probability = 4.473230e-01
Photon flux (15-150 keV) in 0.512 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) = 3.74e-08
S(50-100 keV) = 4.90e-08
T90 vs. Hardness ratio plot
T90 = 0.512000024318695 sec.
Hardness ratio (energy fluence ratio) = 1.31016
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.64742
Count Ratio (50-100 keV) / (15-25 keV) = 1.15395
Mask shadow pattern
IMX = -7.031799341591766E-01, IMY = 3.371067540680654E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.128000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.128000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.128000
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:
-239.152000 -0.304000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9856 -15.6407 0.2 22.7 -71.3 14.4548 52.1 0.4 Sco X-1
256.1461 -37.9948 185.8 18.7 -143.9 0.0139 0.1 11.8 4U 1700-377
256.3884 -36.4708 3.5 17.4 -141.4 0.7384 3.3 3.7 GX 349+2
262.9602 -24.7574 2.5 5.2 -113.1 1.0496 4.7 2.8 GX 1+4
264.7810 -44.5052 11.0 22.3 -168.2 0.2412 1.0 3.7 4U 1735-44
268.5182 -1.5344 4.2 20.8 7.2 0.6622 2.7 10.3 SW J1753.5-0127
270.4473 -25.0528 3.4 3.5 146.9 0.7228 3.4 9.0 GX 5-1
270.4597 -25.6652 19.7 4.0 152.4 -0.1335 -0.6 9.7 GRS 1758-258
274.0443 -13.9898 4.3 10.1 41.3 0.6274 2.7 3.6 GX 17+2
275.9706 -30.2353 2.7 10.7 145.3 0.9081 4.2 8.2 H1820-303
285.0387 -24.7711 12.4 15.8 108.0 -0.2501 -0.9 9.0 HT1900.1-2455
288.8006 10.9255 3.3 39.0 39.4 1.7129 3.4 1.2 GRS 1915+105
262.9551 -33.7803 3.2 12.3 -154.2 0.8699 3.6 3.7 GX 354-0
295.2697 -59.1727 2.6 41.6 165.0 1.8161 4.4 ------ UNKNOWN
294.6409 -77.8295 3.1 56.9 179.2 6.5879 3.7 ------ UNKNOWN
237.8383 -41.0397 3.0 31.5 -127.8 1.1300 3.9 ------ UNKNOWN
211.6546 -59.6143 3.0 54.1 -143.0 5.4013 3.9 ------ UNKNOWN
225.0341 -15.5162 2.7 41.1 -82.5 4.2349 4.3 ------ UNKNOWN
222.8518 -26.0260 5.1 41.2 -98.8 2.9403 2.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.304000 0.208000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9412 -15.7795 101.9 22.7 -71.6 0.0013 0.1 8.6 Sco X-1
255.8024 -37.8227 15.3 18.7 -142.9 -0.0076 -0.8 8.8 4U 1700-377
256.6212 -36.5738 0.0 17.3 -142.1 -0.0200 -2.0 12.7 GX 349+2
263.0433 -24.6725 3.6 5.1 -112.6 -0.0293 -3.2 4.8 GX 1+4
264.9430 -44.4853 7.8 22.3 -168.5 -0.0143 -1.5 8.8 4U 1735-44
268.3521 -1.4326 23.3 20.9 6.7 -0.0048 -0.5 1.5 SW J1753.5-0127
270.2818 -25.0744 583.5 3.5 149.0 0.0002 0.0 0.3 GX 5-1
270.2945 -25.7669 1639.9 4.0 154.9 0.0001 0.0 1.5 GRS 1758-258
274.1795 -14.1653 0.0 10.0 42.5 0.0043 0.5 12.7 GX 17+2
275.7606 -30.2404 384.1 10.5 146.1 0.0003 0.0 11.4 H1820-303
285.0271 -25.0713 34.2 15.8 109.1 -0.0034 -0.3 9.1 HT1900.1-2455
288.9227 10.8207 21.9 39.0 39.6 -0.0110 -0.5 10.5 GRS 1915+105
263.1567 -33.7503 5.2 12.2 -154.9 0.0224 2.2 9.8 GX 354-0
292.0825 -23.3859 2.2 22.2 103.2 0.0652 5.2 ------ UNKNOWN
251.3974 -38.2006 2.0 21.3 -136.2 0.0565 5.6 ------ UNKNOWN
245.6820 -56.5487 0.7 37.9 -154.4 0.2335 17.7 ------ UNKNOWN
236.3561 -42.8767 2.2 33.3 -129.9 0.0707 5.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
82.148590 598.548600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.1572 -60.7041 15.4 37.3 -90.7 -1.2176 -0.7 6.7 Cen X-3
186.6454 -62.7690 0.6 29.3 -88.9 10.5613 18.2 0.3 GX 301-2
244.9823 -15.6399 0.4 40.9 36.9 27.7760 27.5 0.2 Sco X-1
255.8156 -37.9208 4.2 19.8 62.1 1.2657 2.7 9.3 4U 1700-377
256.4539 -36.5010 3.3 21.3 62.3 1.6869 3.5 4.8 GX 349+2
262.9239 -24.6911 5.8 34.2 66.5 2.0348 2.0 5.7 GX 1+4
265.0295 -44.4170 0.0 17.2 91.2 -1.4990 -3.3 12.4 4U 1735-44
270.2863 -25.1925 396.4 36.0 77.7 -0.0358 -0.0 6.8 GX 5-1
270.3056 -25.7415 14.2 35.5 78.1 -0.9507 -0.8 0.2 GRS 1758-258
276.1036 -30.3511 9.6 33.7 89.8 1.3727 1.2 9.3 H1820-303
262.9798 -33.8627 2.6 25.6 72.8 2.6409 4.3 1.7 GX 354-0
251.5365 -45.7081 2.6 11.4 59.0 1.6911 4.5 ------ UNKNOWN
3.1058 -69.8078 2.9 45.9 -167.3 2.8182 4.0 ------ UNKNOWN
29.7034 -60.5531 4.6 59.5 -161.7 8.9450 2.5 ------ UNKNOWN
191.3719 -23.4597 3.3 51.1 -35.1 5.8212 3.6 ------ UNKNOWN
182.0824 -35.1482 4.3 47.1 -53.2 5.4559 2.7 ------ UNKNOWN
101.2693 -73.1892 3.3 48.0 -129.0 6.5373 3.5 ------ UNKNOWN
Plot creation:
Sun May 31 01:07:00 EDT 2015