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
270.8946 -16.9508 0.0037 5.9926 -132.1383 2.4889201 51.561 TRIG_00537266
Foreground time interval of the image:
-0.296 12.389 (delta_t = 12.685 [sec])
Background time interval of the image:
-239.512 -0.296 (delta_t = 239.216 [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 -0.296 sec. to 74.916 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85725 ( -0.088714 0.0897459 )
Norm@50keV : 2.96413E-03 ( -0.000146897 0.000145865 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.50 using 59 PHA bins.
# Reduced chi-squared = 0.6929 for 57 degrees of freedom
# Null hypothesis probability = 9.625732e-01
Photon flux (15-150 keV) in 75.21 sec: 0.417872 ( -0.0197749 0.0198296 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.04965e-06 ( -1.01691e-07 1.02304e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.296 sec. to 74.916 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73153 ( -0.347011 0.324521 )
Epeak [keV] : 99.6251 ( -43.8909 -99.6375 )
Norm@50keV : 3.45193E-03 ( -0.000950555 0.00175488 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.07 using 59 PHA bins.
# Reduced chi-squared = 0.6976 for 56 degrees of freedom
# Null hypothesis probability = 9.584483e-01
Photon flux (15-150 keV) in 75.21 sec: 0.414240 ( -0.021719 0.021682 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.0237e-06 ( -1.22495e-07 1.20148e-07 ) ergs/cm2
Band function
Time interval is from -0.296 sec. to 74.916 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.93086 ( -4.93086 -4.93086 )
beta : -1.88764 ( -0.104695 0.0938842 )
Epeak [keV] : 20.2425 ( -20.2425 3.38644 )
Norm@50keV : 1445.12 ( -64.6236 2.45737e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.55 using 59 PHA bins.
# Reduced chi-squared = 0.6828 for 55 degrees of freedom
# Null hypothesis probability = 9.652984e-01
Photon flux (15-150 keV) in 75.21 sec: 0.409570 ( 6.59043 -0.022208 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.00998e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.7721 ( )
R^2/D10^2 : 0.100262 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 160.82 using 59 PHA bins.
# Reduced chi-squared = 2.8215 for 57 degrees of freedom
# Null hypothesis probability = 7.815899e-12
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.206e-07 2.065e-08
25- 50 6.787e-07 3.463e-08
50-150 5.582e-07 6.175e-08
15-150 1.458e-06 7.709e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 95.5026 (-15.6519 21.1542)
Norm : 1.82671 (-0.129128 0.144155)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.11 using 59 PHA bins.
# Reduced chi-squared = 0.7563 for 57 degrees of freedom
# Null hypothesis probability = 9.132237e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.590e-07 3.257e-08
25- 50 6.149e-07 3.211e-08
50-150 9.703e-07 2.610e-07
15-150 1.944e-06 2.828e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.50614 (-0.781568 0.828877)
R1^2/D10^2 : 0.692324 (-0.243616 0.426588)
kT2 [keV] : 24.5333 (-3.68667 5.39222)
R2^2/D10^2 : 4.94308E-03 (-0.00251439 0.00421644)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.35 using 59 PHA bins.
# Reduced chi-squared = 0.6791 for 55 degrees of freedom
# Null hypothesis probability = 9.671779e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.653e-07 5.111e-08
25- 50 6.065e-07 7.107e-08
50-150 1.036e-06 2.074e-07
15-150 2.007e-06 3.031e-07
Peak spectrum fit
Power-law model
Time interval is from 5.676 sec. to 6.676 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59253 ( -0.121649 0.122947 )
Norm@50keV : 1.82213E-02 ( -0.00138898 0.00138178 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.18 using 59 PHA bins.
# Reduced chi-squared = 1.179 for 57 degrees of freedom
# Null hypothesis probability = 1.676477e-01
Photon flux (15-150 keV) in 1 sec: 2.33613 ( -0.172715 0.172881 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70567e-07 ( -1.39119e-08 1.40112e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.676 sec. to 6.676 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.806596 ( -0.569117 0.504607 )
Epeak [keV] : 72.2911 ( -13.9444 45.1056 )
Norm@50keV : 4.72222E-02 ( -0.021187 0.0456935 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.67 using 59 PHA bins.
# Reduced chi-squared = 1.065 for 56 degrees of freedom
# Null hypothesis probability = 3.439063e-01
Photon flux (15-150 keV) in 1 sec: 2.26743 ( -0.17796 0.17807 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.6052e-07 ( -1.5174e-08 1.536e-08 ) ergs/cm2
Band function
Time interval is from 5.676 sec. to 6.676 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.806347 ( -0.39907 0.447488 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 72.2738 ( -11.9338 45.1026 )
Norm@50keV : 4.72342E-02 ( -0.0212025 0.0457152 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.67 using 59 PHA bins.
# Reduced chi-squared = 1.085 for 55 degrees of freedom
# Null hypothesis probability = 3.099302e-01
Photon flux (15-150 keV) in 1 sec: 2.27054 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.64881e-07 ( -1.64874e-07 -1.4377e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.6039 (-1.19755 1.32701)
R^2/D10^2 : 0.374067 (-0.106959 0.147983)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.72 using 59 PHA bins.
# Reduced chi-squared = 1.592 for 57 degrees of freedom
# Null hypothesis probability = 2.992796e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.466e-08 2.125e-09
25- 50 5.295e-08 5.055e-09
50-150 6.356e-08 1.004e-08
15-150 1.312e-07 1.205e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 162.628 (-46.5043 -162.637)
Norm : 9.68065 (-0.773291 0.858203)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.85 using 59 PHA bins.
# Reduced chi-squared = 1.085 for 57 degrees of freedom
# Null hypothesis probability = 3.072673e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.468e-08 2.365e-09
25- 50 4.627e-08 8.845e-09
50-150 9.433e-08 4.127e-08
15-150 1.653e-07 5.119e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.30019 (-1.43051 1.63204)
R1^2/D10^2 : 2.12721 (-0.988781 2.18592)
kT2 [keV] : 23.5276 (-4.48264 8.02309)
R2^2/D10^2 : 3.79790E-02 (-0.0255123 0.0448907)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.87 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 55 degrees of freedom
# Null hypothesis probability = 4.418358e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.275e-08 7.507e-09
25- 50 4.887e-08 1.285e-08
50-150 9.092e-08 4.282e-08
15-150 1.625e-07 5.680e-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: 1.79668 ( -0.0630039 0.063391 )
Norm@50keV : 1.14926E-02 ( -0.000403498 0.000402344 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.96 using 59 PHA bins.
# Reduced chi-squared = 0.9643 for 57 degrees of freedom
# Null hypothesis probability = 5.518167e-01
Photon flux (15-150 keV) in 12.68 sec: 1.58163 ( -0.0566974 0.0568522 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34172e-06 ( -4.80317e-08 4.8175e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30946 ( -0.280279 0.262518 )
Epeak [keV] : 68.0768 ( -9.91581 24.9274 )
Norm@50keV : 2.04280E-02 ( -0.00533232 0.00785391 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.39 using 59 PHA bins.
# Reduced chi-squared = 0.7926 for 56 degrees of freedom
# Null hypothesis probability = 8.686102e-01
Photon flux (15-150 keV) in 12.68 sec: 1.53048 ( -0.06225 0.06241 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.28374e-06 ( -5.67531e-08 5.68698e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.216360 ( -1.03919 4.03479 )
beta : -1.99099 ( -0.14728 0.121965 )
Epeak [keV] : 39.8251 ( -10.003 12.6211 )
Norm@50keV : 0.106060 ( -0.173081 104.119 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.48 using 59 PHA bins.
# Reduced chi-squared = 0.6815 for 55 degrees of freedom
# Null hypothesis probability = 9.659913e-01
Photon flux (15-150 keV) in 12.68 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.28826e-06 ( -1.28817e-06 -5.27361e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 5.89e-07
S(50-100 keV) = 6.51e-07
T90 vs. Hardness ratio plot
T90 = 54.6799999475479 sec.
Hardness ratio (energy fluence ratio) = 1.10526
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.07306
Count Ratio (50-100 keV) / (15-25 keV) = 0.615913
Mask shadow pattern
IMX = -7.042880928023336E-02, IMY = 7.784037113046700E-02
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:
-239.512000 -0.296000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9781 -15.6410 0.4 29.5 -95.5 9.0184 26.7 0.1 Sco X-1
254.4110 35.3427 2.2 51.9 -17.7 3.0450 5.3 2.3 Her X-1
255.9857 -37.8606 1.3 30.5 -145.2 2.4247 8.6 1.0 4U 1700-377
256.4587 -36.4153 3.2 29.1 -143.9 0.9758 3.6 1.2 GX 349+2
262.8457 -24.6838 4.8 16.8 -133.5 0.5426 2.4 9.6 GX 1+4
264.7134 -44.5469 9.5 33.1 -162.3 0.2997 1.2 5.9 4U 1735-44
268.4503 -1.5078 4.1 13.0 -27.6 0.6138 2.8 5.9 SW J1753.5-0127
270.3074 -25.0696 2.5 13.2 -156.2 1.0118 4.6 1.4 GX 5-1
270.2278 -25.8917 3.4 14.0 -157.1 0.7353 3.4 9.8 GRS 1758-258
274.0369 -14.0210 1.7 1.8 -135.4 1.6236 6.9 2.0 GX 17+2
275.9925 -30.2647 6.3 17.6 -178.2 0.4145 1.8 7.1 H1820-303
285.1875 -24.8326 18.3 15.4 147.7 -0.1468 -0.6 9.8 HT1900.1-2455
288.8122 10.9259 2.3 27.2 34.3 1.5084 5.0 1.4 GRS 1915+105
262.9491 -33.8455 3.8 23.9 -150.2 0.7432 3.0 2.1 GX 354-0
266.2890 -26.3989 1.1 16.1 -145.9 2.3002 10.6 ------ UNKNOWN
237.9520 -65.9138 3.6 58.9 -159.2 4.8080 3.3 ------ UNKNOWN
232.5974 -41.9571 3.0 47.1 -132.6 3.1492 3.9 ------ UNKNOWN
235.7440 13.6504 2.2 47.2 -53.5 5.1278 5.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.296000 12.388600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9344 -15.7680 7.9 29.5 -95.7 -0.1108 -1.5 8.1 Sco X-1
254.4686 35.3407 4.0 51.9 -17.6 -0.3600 -2.9 0.5 Her X-1
255.8137 -37.8534 22.5 30.6 -144.9 0.0312 0.5 8.2 4U 1700-377
256.4970 -36.2846 18.3 29.0 -143.8 0.0375 0.6 8.8 GX 349+2
262.9890 -24.8920 5.9 16.8 -134.4 0.0978 1.9 8.9 GX 1+4
264.9005 -44.4671 105.9 33.0 -162.4 0.0066 0.1 6.8 4U 1735-44
268.3336 -1.3054 6.3 13.3 -27.6 -0.0869 -1.8 9.1 SW J1753.5-0127
270.3926 -25.1380 5.0 13.3 -156.6 0.1107 2.4 6.9 GX 5-1
270.1399 -25.5980 5.4 13.8 -156.4 -0.1034 -2.2 12.4 GRS 1758-258
274.1516 -13.9003 6.9 1.6 -135.6 -0.0779 -1.7 11.8 GX 17+2
276.0427 -30.2644 4.8 17.6 -178.3 -0.1201 -2.4 8.7 H1820-303
285.1044 -24.8998 11.4 15.4 148.1 0.0508 1.0 3.9 HT1900.1-2455
288.7631 11.0899 4.6 27.3 34.0 0.1654 2.5 8.9 GRS 1915+105
263.0129 -33.7053 5.1 23.8 -150.2 0.1193 2.3 7.9 GX 354-0
270.8946 -16.9508 0.2 6.0 -132.1 2.4889 51.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
36.388600 962.620400
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9767 -15.6347 0.3 24.9 -84.9 30.8382 35.9 0.4 Sco X-1
254.3549 35.1721 11.7 54.4 -10.8 -1.9716 -1.0 11.4 Her X-1
255.9949 -37.8425 0.6 24.7 -145.0 13.5458 20.0 0.4 4U 1700-377
256.3677 -36.3814 4.9 23.3 -143.5 1.6031 2.4 4.1 GX 349+2
263.1630 -24.5952 4.6 10.5 -132.1 1.8439 2.5 12.3 GX 1+4
264.8783 -44.3322 4.7 27.8 -164.9 1.6251 2.5 9.1 4U 1735-44
268.3466 -1.4472 2.3 15.7 -3.7 3.1528 5.0 1.3 SW J1753.5-0127
270.2760 -25.0985 1.2 8.2 -170.2 6.2128 9.7 1.2 GX 5-1
270.3110 -25.6806 4.0 8.7 -170.7 2.0625 3.1 3.8 GRS 1758-258
273.9217 -14.0738 2.3 4.1 51.5 3.6197 5.1 5.4 GX 17+2
276.0933 -30.3546 4.6 14.2 167.3 1.6367 2.5 8.7 H1820-303
284.8832 -24.9870 8.0 15.3 129.8 1.0088 1.4 9.2 HT1900.1-2455
288.8390 11.0251 4.4 33.1 39.4 2.4609 2.6 5.3 GRS 1915+105
262.8669 -33.8590 6.7 18.4 -152.6 1.2150 1.7 6.3 GX 354-0
296.1592 19.7768 3.8 44.3 40.9 6.8433 3.0 ------ UNKNOWN
309.5573 -55.8646 3.3 48.7 158.0 7.2562 3.5 ------ UNKNOWN
270.5073 -20.4600 2.3 3.5 -168.1 3.0569 5.0 ------ UNKNOWN
266.2761 -26.4204 0.8 10.4 -150.6 9.7734 14.9 ------ UNKNOWN
256.7148 -66.6073 3.7 50.5 -167.0 5.1730 3.1 ------ UNKNOWN
229.9709 -70.2129 4.2 58.7 -159.2 12.9879 2.8 ------ UNKNOWN
Plot creation:
Sat May 30 17:58:29 EDT 2015