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
314.8975 -22.5369 0.0096 37.5336 -70.9081 2.0793661 20.024 TRIG_00554635
Foreground time interval of the image:
-0.616 10.413 (delta_t = 11.029 [sec])
Background time interval of the image:
-439.887 -413.786 (delta_t = 26.101 [sec])
-239.288 -0.616 (delta_t = 238.672 [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 -0.616 sec. to 29.496 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62760 ( -0.153132 0.154582 )
Norm@50keV : 5.18189E-03 ( -0.00048496 0.00048198 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.81 using 59 PHA bins.
# Reduced chi-squared = 0.7336 for 57 degrees of freedom
# Null hypothesis probability = 9.343284e-01
Photon flux (15-150 keV) in 30.11 sec: 0.671715 ( -0.0619356 0.0620448 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.45453e-06 ( -1.43905e-07 1.45028e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.616 sec. to 29.496 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12935 ( -0.698635 0.560877 )
Epeak [keV] : 82.8528 ( -25.6423 -82.856 )
Norm@50keV : 9.51159E-03 ( -0.00456438 0.0125422 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.80 using 59 PHA bins.
# Reduced chi-squared = 0.7107 for 56 degrees of freedom
# Null hypothesis probability = 9.500240e-01
Photon flux (15-150 keV) in 30.11 sec: 0.658588 ( -0.063997 0.063989 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.39682e-06 ( -1.61817e-07 1.61399e-07 ) ergs/cm2
Band function
Time interval is from -0.616 sec. to 29.496 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.13911 ( -5.3438 -4.21731 )
beta : -1.84644 ( -0.274364 0.229052 )
Epeak [keV] : 30.3468 ( -6.77654 6.11909 )
Norm@50keV : 11.1156 ( -11.1114 101.374 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.45 using 59 PHA bins.
# Reduced chi-squared = 0.6627 for 55 degrees of freedom
# Null hypothesis probability = 9.746177e-01
Photon flux (15-150 keV) in 30.11 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40631e-06 ( -1.4061e-06 -1.49041e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.9583 (-1.41384 1.64136)
R^2/D10^2 : 0.125281 (-0.0444615 0.0666849)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.39 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 57 degrees of freedom
# Null hypothesis probability = 2.338694e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.343e-07 2.400e-08
25- 50 4.611e-07 5.661e-08
50-150 4.886e-07 9.801e-08
15-150 1.084e-06 1.257e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 160.684 (-57.1559 -159.508)
Norm : 2.76256 (-0.269827 0.350645)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.87 using 59 PHA bins.
# Reduced chi-squared = 0.6995 for 57 degrees of freedom
# Null hypothesis probability = 9.587464e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.123e-07 5.150e-08
25- 50 3.974e-07 1.230e-07
50-150 8.064e-07 4.193e-07
15-150 1.416e-06 4.819e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.09167 (-1.70474 1.84891)
R1^2/D10^2 : 0.507073 (-0.243714 0.572708)
kT2 [keV] : 30.8432 (-9.55111 30.3779)
R2^2/D10^2 : 3.90464E-03 (-0.0033737 0.0114349)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.13 using 59 PHA bins.
# Reduced chi-squared = 0.6569 for 55 degrees of freedom
# Null hypothesis probability = 9.769024e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.995e-07 6.310e-08
25- 50 4.327e-07 1.321e-07
50-150 8.015e-07 3.799e-07
15-150 1.434e-06 5.444e-07
Peak spectrum fit
Power-law model
Time interval is from 0.972 sec. to 1.972 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39075 ( -0.212526 0.211304 )
Norm@50keV : 2.59044E-02 ( -0.00337991 0.00337363 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.96 using 59 PHA bins.
# Reduced chi-squared = 0.6836 for 57 degrees of freedom
# Null hypothesis probability = 9.675150e-01
Photon flux (15-150 keV) in 1 sec: 3.14812 ( -0.424427 0.425127 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.50784e-07 ( -3.51745e-08 3.53257e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.972 sec. to 1.972 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.13991 ( -0.895678 0.438903 )
Epeak [keV] : 180.146 ( -180.157 -180.157 )
Norm@50keV : 3.45239E-02 ( -0.0157208 0.0582218 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.67 using 59 PHA bins.
# Reduced chi-squared = 0.6906 for 56 degrees of freedom
# Null hypothesis probability = 9.624966e-01
Photon flux (15-150 keV) in 1 sec: 3.13195 ( -0.4276 0.42801 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.4847e-07 ( -3.6524e-08 3.6235e-08 ) ergs/cm2
Band function
Time interval is from 0.972 sec. to 1.972 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.73723 ( -4.73723 -4.73723 )
beta : -1.55256 ( -0.286113 0.260524 )
Epeak [keV] : 29.1560 ( -14.1968 6.3917 )
Norm@50keV : 674.993 ( -87.1207 9.82746e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.95 using 59 PHA bins.
# Reduced chi-squared = 0.6718 for 55 degrees of freedom
# Null hypothesis probability = 9.706650e-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] : 16.8216 (-2.73239 3.31837)
R^2/D10^2 : 0.251996 (-0.116838 0.213856)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.40 using 59 PHA bins.
# Reduced chi-squared = 0.9544 for 57 degrees of freedom
# Null hypothesis probability = 5.731928e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.456e-08 3.712e-09
25- 50 6.390e-08 1.491e-08
50-150 1.287e-07 3.139e-08
15-150 2.071e-07 3.880e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 13.1495 (-1.71621 1.71604)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.43 using 59 PHA bins.
# Reduced chi-squared = 0.7093 for 57 degrees of freedom
# Null hypothesis probability = 9.525946e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.275e-08 1.850e-08
25- 50 6.301e-08 3.540e-08
50-150 1.382e-07 7.645e-08
15-150 2.340e-07 1.295e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.81287 (-2.51912 3.78009)
R1^2/D10^2 : 2.30176 (-1.60029 6.149)
kT2 [keV] : 31.6372 (-10.1677 87.911)
R2^2/D10^2 : 2.25659E-02 (-0.021184 0.0687776)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.64 using 59 PHA bins.
# Reduced chi-squared = 0.6843 for 55 degrees of freedom
# Null hypothesis probability = 9.644973e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.837e-08 1.614e-08
25- 50 6.343e-08 3.181e-08
50-150 1.590e-07 8.468e-08
15-150 2.508e-07 1.230e-07
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: 1.69190 ( -0.136127 0.138295 )
Norm@50keV : 1.14838E-02 ( -0.000951967 0.000944703 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.66 using 59 PHA bins.
# Reduced chi-squared = 0.8185 for 57 degrees of freedom
# Null hypothesis probability = 8.341989e-01
Photon flux (15-150 keV) in 11.03 sec: 1.52088 ( -0.122574 0.122759 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17354e-06 ( -1.01609e-07 1.02238e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42172 ( -0.58624 0.38154 )
Epeak [keV] : 103.646 ( )
Norm@50keV : 1.58946E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.90 using 59 PHA bins.
# Reduced chi-squared = 0.8196 for 56 degrees of freedom
# Null hypothesis probability = 8.301356e-01
Photon flux (15-150 keV) in 11.03 sec: 1.50420 ( -0.12685 0.12676 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15149e-06 ( -1.11441e-07 1.11083e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.94478 ( -4.94478 -4.94478 )
beta : -1.73758 ( -0.154578 0.146491 )
Epeak [keV] : 21.4283 ( -21.4283 4.7766 )
Norm@50keV : 3435.77 ( -267.699 7.7791e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.36 using 59 PHA bins.
# Reduced chi-squared = 0.8248 for 55 degrees of freedom
# Null hypothesis probability = 8.197184e-01
Photon flux (15-150 keV) in 11.03 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15389e-06 ( -1.15382e-06 -1.11485e-07 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 3.82e-07
S(50-100 keV) = 4.94e-07
T90 vs. Hardness ratio plot
T90 = 25.904000043869 sec.
Hardness ratio (energy fluence ratio) = 1.29319
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.5718
Count Ratio (50-100 keV) / (15-25 keV) = 1.003
Mask shadow pattern
IMX = 2.512856471787510E-01, IMY = 7.260013859811530E-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:
-439.887400 -413.786400
-239.288000 -0.616000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9814 -15.6571 0.7 29.4 89.4 8.2581 17.6 1.0 Sco X-1
255.8206 -37.6761 0.0 27.8 38.0 -0.3064 -0.9 12.8 4U 1700-377
256.4539 -36.4442 3.2 26.5 39.1 1.2314 3.6 1.5 GX 349+2
262.9716 -24.5972 12.7 14.6 55.1 0.2132 0.9 9.1 GX 1+4
264.8923 -44.6082 11.7 29.9 18.2 -0.3163 -1.0 11.4 4U 1735-44
268.3386 -1.4248 7.8 16.3 156.1 0.3985 1.5 2.4 SW J1753.5-0127
270.4189 -25.0851 2.2 10.2 30.3 1.3934 5.3 7.3 GX 5-1
270.2537 -25.7589 3.5 10.9 29.3 0.8793 3.4 2.8 GRS 1758-258
273.9644 -13.9634 5.2 2.6 145.9 0.5500 2.2 5.0 GX 17+2
275.9409 -30.3893 4.8 14.3 1.7 0.6174 2.4 1.6 H1820-303
285.1845 -24.7762 7.3 12.5 -41.5 -0.3919 -1.6 11.8 HT1900.1-2455
288.8103 10.9264 1.1 30.0 -150.5 3.2556 11.0 1.3 GRS 1915+105
299.5901 35.2159 7.2 56.1 -153.6 -2.1161 -1.6 0.9 Cyg X-1
262.8923 -33.9383 3.4 21.2 33.2 0.9138 3.4 7.9 GX 354-0
243.5326 21.1214 2.5 48.7 141.6 5.9878 4.5 ------ UNKNOWN
277.3865 26.3821 2.9 42.5 -174.8 1.8978 4.0 ------ UNKNOWN
291.6919 -60.3431 2.5 45.8 -8.2 1.9416 4.6 ------ UNKNOWN
318.8193 -18.0656 2.3 41.3 -77.9 5.2231 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.616000 10.412610
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.0634 -15.7655 74.9 29.3 89.2 0.0103 0.2 8.9 Sco X-1
255.9774 -37.6971 13.2 27.7 37.8 0.0454 0.9 8.8 4U 1700-377
256.6010 -36.5895 0.0 26.5 38.7 0.0968 1.9 12.8 GX 349+2
263.1206 -24.8968 14.6 14.6 53.8 -0.0342 -0.8 10.9 GX 1+4
264.8414 -44.4646 7.4 29.8 18.4 -0.0792 -1.6 4.3 4U 1735-44
268.5128 -1.4339 7.3 16.2 156.7 0.0617 1.6 8.8 SW J1753.5-0127
270.4481 -25.0859 6.5 10.2 30.2 -0.0699 -1.8 8.9 GX 5-1
270.1343 -25.5950 0.0 10.8 30.2 -0.0681 -1.7 12.7 GRS 1758-258
274.1535 -13.8801 0.0 2.6 150.3 -0.0764 -2.0 12.7 GX 17+2
275.7593 -30.4159 13.2 14.3 2.3 0.0341 0.9 9.1 H1820-303
284.9599 -24.7792 11.1 12.3 -40.8 0.0420 1.0 9.4 HT1900.1-2455
288.9204 11.0750 8.7 30.2 -150.4 -0.0641 -1.3 10.6 GRS 1915+105
299.6352 35.3201 5.2 56.2 -153.6 0.5109 2.2 7.4 Cyg X-1
262.8194 -33.6798 8.8 21.0 33.7 0.0614 1.3 12.6 GX 354-0
277.6951 -50.9614 2.3 34.9 0.6 0.2570 4.9 ------ UNKNOWN
314.8975 -22.5368 0.6 37.5 -70.9 2.0794 20.0 ------ UNKNOWN
302.4474 35.8394 2.1 57.8 -151.5 1.5836 5.5 ------ UNKNOWN
307.0850 28.0158 2.1 53.6 -142.2 1.5399 5.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
66.612600 962.768400
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
274.0084 -14.0395 12.4 39.6 112.0 1.9031 0.9 0.2 GX 17+2
275.7522 -30.2396 0.0 35.7 86.0 -1.7326 -1.1 11.8 H1820-303
285.0337 -24.9226 46.3 27.4 95.9 0.2494 0.2 0.2 HT1900.1-2455
288.8004 10.9557 1.6 42.1 156.8 10.1757 7.0 0.6 GRS 1915+105
271.7875 -26.2159 3.7 39.2 92.5 7.2291 3.1 ------ UNKNOWN
277.5811 11.9970 2.0 50.3 146.5 19.2194 5.7 ------ UNKNOWN
15.3743 -64.4305 3.2 57.2 -9.7 10.7278 3.6 ------ UNKNOWN
311.8527 36.5126 2.8 59.1 -166.0 14.8904 4.1 ------ UNKNOWN
319.0026 36.0714 3.8 58.7 -159.2 14.2777 3.1 ------ UNKNOWN
7.1183 -29.5705 3.5 47.1 -53.0 11.3623 3.3 ------ UNKNOWN
Plot creation:
Sat May 30 17:01:59 EDT 2015