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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
296.2788 -7.9738 0.0045 35.0776 -142.2866 3.7913343 42.498 TRIG_00555821
Foreground time interval of the image:
-7.088 14.485 (delta_t = 21.573 [sec])
Background time interval of the image:
-214.315 -7.088 (delta_t = 207.227 [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
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
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 -7.088 sec. to 273.644 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75522 ( -0.0521246 0.0523291 )
Norm@50keV : 3.47381E-03 ( -9.23006e-05 9.21694e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.25 using 59 PHA bins.
# Reduced chi-squared = 0.6359 for 57 degrees of freedom
# Null hypothesis probability = 9.854800e-01
Photon flux (15-150 keV) in 280.7 sec: 0.470625 ( -0.0140397 0.0141036 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.99498e-06 ( -2.44555e-07 2.4489e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.088 sec. to 273.644 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64174 ( -0.206251 0.153336 )
Epeak [keV] : 165.530 ( -74.4139 -165.53 )
Norm@50keV : 3.93205E-03 ( -0.000526595 0.000964046 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.30 using 59 PHA bins.
# Reduced chi-squared = 0.6303 for 56 degrees of freedom
# Null hypothesis probability = 9.861904e-01
Photon flux (15-150 keV) in 280.7 sec: 0.465870 ( -0.016066 0.015669 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.915e-06 ( -2.84546e-07 2.80447e-07 ) ergs/cm2
Band function
Time interval is from -7.088 sec. to 273.644 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.25293 ( 1.25362 1.25362 )
beta : -1.79399 ( 1.79394 0.0745897 )
Epeak [keV] : 51.8389 ( -51.9176 -51.9176 )
Norm@50keV : 7.03879E-03 ( -0.00388539 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.78 using 59 PHA bins.
# Reduced chi-squared = 0.6324 for 55 degrees of freedom
# Null hypothesis probability = 9.848900e-01
Photon flux (15-150 keV) in 280.7 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] : 14.2958 ( )
R^2/D10^2 : 5.58040E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 375.99 using 59 PHA bins.
# Reduced chi-squared = 6.5963 for 57 degrees of freedom
# Null hypothesis probability = 1.597832e-48
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.747e-07 3.621e-08
25- 50 2.562e-06 8.898e-08
50-150 3.484e-06 1.768e-07
15-150 6.720e-06 1.965e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 128.919 ( )
Norm : 1.93500 (-0.082778 0.0711214)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.20 using 59 PHA bins.
# Reduced chi-squared = 0.7579 for 57 degrees of freedom
# Null hypothesis probability = 9.116305e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.367e-06 7.635e-08
25- 50 2.503e-06 1.214e-07
50-150 4.766e-06 1.064e-06
15-150 8.636e-06 1.140e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.93636 (-0.596004 0.624081)
R1^2/D10^2 : 0.558158 (-0.149553 0.223701)
kT2 [keV] : 25.7366 (-2.28647 2.88536)
R2^2/D10^2 : 5.13155E-03 (-0.00166288 0.00217394)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.80 using 59 PHA bins.
# Reduced chi-squared = 0.7237 for 55 degrees of freedom
# Null hypothesis probability = 9.387332e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.363e-06 1.156e-07
25- 50 2.553e-06 1.245e-07
50-150 4.850e-06 3.425e-07
15-150 8.766e-06 4.940e-07
Peak spectrum fit
Power-law model
Time interval is from 13.440 sec. to 14.440 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49743 ( -0.146923 0.147365 )
Norm@50keV : 2.35005E-02 ( -0.00210805 0.00210309 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.62 using 59 PHA bins.
# Reduced chi-squared = 1.274 for 57 degrees of freedom
# Null hypothesis probability = 7.944453e-02
Photon flux (15-150 keV) in 1 sec: 2.93177 ( -0.267813 0.268292 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.23031e-07 ( -2.14973e-08 2.16167e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 13.440 sec. to 14.440 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.986999 ( -0.6514 0.558999 )
Epeak [keV] : 99.2175 ( -31.7753 -99.2187 )
Norm@50keV : 4.27884E-02 ( -0.0199966 0.0475154 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.27 using 59 PHA bins.
# Reduced chi-squared = 1.255 for 56 degrees of freedom
# Null hypothesis probability = 9.502732e-02
Photon flux (15-150 keV) in 1 sec: 2.88024 ( -0.27401 0.27425 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.15893e-07 ( -2.3394e-08 2.3251e-08 ) ergs/cm2
Band function
Time interval is from 13.440 sec. to 14.440 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.88134 ( -6.96968 -4.88134 )
beta : -1.70745 ( -0.257794 0.191485 )
Epeak [keV] : 29.5044 ( -4.378 4.51126 )
Norm@50keV : 776.151 ( -67.8223 2494.48 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.63 using 59 PHA bins.
# Reduced chi-squared = 1.193 for 55 degrees of freedom
# Null hypothesis probability = 1.544249e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.16219e-07 ( -2.16212e-07 -2.2531e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.7817 (-1.64317 1.87941)
R^2/D10^2 : 0.354200 (-0.122763 0.185036)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 96.55 using 59 PHA bins.
# Reduced chi-squared = 1.694 for 57 degrees of freedom
# Null hypothesis probability = 8.351462e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.624e-08 2.930e-09
25- 50 6.366e-08 7.490e-09
50-150 9.403e-08 1.543e-08
15-150 1.739e-07 2.000e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 12.0916 (-1.06483 1.06478)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.02 using 59 PHA bins.
# Reduced chi-squared = 1.246 for 57 degrees of freedom
# Null hypothesis probability = 1.002334e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.012e-08 3.885e-09
25- 50 5.793e-08 1.011e-08
50-150 1.270e-07 6.108e-08
15-150 2.151e-07 7.321e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.12975 (-1.74872 2.1031)
R1^2/D10^2 : 1.97852 (-1.00123 2.29589)
kT2 [keV] : 30.1583 (-8.05692 23.1423)
R2^2/D10^2 : 2.12212E-02 (-0.0175444 0.0273351)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.44 using 59 PHA bins.
# Reduced chi-squared = 1.208 for 55 degrees of freedom
# Null hypothesis probability = 1.388129e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.693e-08 9.315e-09
25- 50 6.166e-08 1.924e-08
50-150 1.312e-07 6.090e-08
15-150 2.198e-07 8.211e-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: 1.43654 ( -0.0617922 0.0616621 )
Norm@50keV : 1.24816E-02 ( -0.000438802 0.000438799 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.98 using 59 PHA bins.
# Reduced chi-squared = 0.8944 for 57 degrees of freedom
# Null hypothesis probability = 6.990605e-01
Photon flux (15-150 keV) in 21.57 sec: 1.53312 ( -0.0587209 0.0588744 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.58281e-06 ( -9.53127e-08 9.54356e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.833805 ( -0.284417 0.267309 )
Epeak [keV] : 105.946 ( -17.7135 40.5091 )
Norm@50keV : 2.37090E-02 ( -0.00573425 0.00810523 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.10 using 59 PHA bins.
# Reduced chi-squared = 0.6268 for 56 degrees of freedom
# Null hypothesis probability = 9.870721e-01
Photon flux (15-150 keV) in 21.57 sec: 1.48028 ( -0.06251 0.06279 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.49949e-06 ( -1.03687e-07 1.0304e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.688426 ( -0.369051 0.859931 )
beta : -1.86383 ( 1.86467 0.275952 )
Epeak [keV] : 90.6247 ( -36.2134 45.4968 )
Norm@50keV : 2.85114E-02 ( -0.00969136 0.068514 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.28 using 59 PHA bins.
# Reduced chi-squared = 0.6232 for 55 degrees of freedom
# Null hypothesis probability = 9.872264e-01
Photon flux (15-150 keV) in 21.57 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) = 2.49e-06
S(50-100 keV) = 2.95e-06
T90 vs. Hardness ratio plot
T90 = 214.191999971867 sec.
Hardness ratio (energy fluence ratio) = 1.18474
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.19235
Count Ratio (50-100 keV) / (15-25 keV) = 0.767289
Mask shadow pattern
IMX = -5.555198484791486E-01, IMY = 4.295616410294206E-01
TIME vs. PHA plot around the trigger time
TIME vs. DetID plot around the trigger time
100 us light curve (15-350 keV)
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:
-214.315410 -7.088000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9807 -15.6473 0.5 23.8 98.0 8.1782 24.9 0.4 Sco X-1
255.8779 -37.9674 71.2 12.5 20.0 0.0350 0.2 9.0 4U 1700-377
256.4809 -36.4266 2.0 11.2 24.1 1.2946 5.9 2.2 GX 349+2
263.2147 -24.6811 7.2 5.1 124.3 0.3762 1.6 11.9 GX 1+4
264.7025 -44.4031 5.0 15.5 -16.9 0.5047 2.3 3.3 4U 1735-44
268.3806 -1.5843 4.2 27.4 162.9 0.7340 2.7 7.9 SW J1753.5-0127
270.1159 -25.0965 5.9 5.1 -160.0 -0.4681 -2.0 9.2 GX 5-1
270.2161 -25.7182 9.1 4.7 -154.3 0.3156 1.3 4.9 GRS 1758-258
273.8971 -13.8982 5.8 16.6 -175.1 0.4488 2.0 10.4 GX 17+2
275.8753 -30.2948 4.2 8.3 -100.0 0.5785 2.8 5.0 H1820-303
285.2274 -24.8144 0.0 17.3 -120.9 0.1300 0.5 12.2 HT1900.1-2455
288.7943 10.9813 2.4 45.4 -169.8 2.0498 4.8 2.2 GRS 1915+105
263.0832 -34.0315 0.0 5.8 6.8 0.1169 0.5 12.7 GX 354-0
298.2646 19.6692 3.4 57.5 -165.4 3.7802 3.4 ------ UNKNOWN
302.3554 19.4395 3.7 59.6 -161.5 5.9150 3.1 ------ UNKNOWN
303.3878 17.6056 3.9 58.7 -159.3 4.9382 3.0 ------ UNKNOWN
303.1308 -42.4534 3.0 32.4 -76.9 1.4524 3.9 ------ UNKNOWN
322.0499 -68.4583 4.0 50.8 -44.5 4.1686 2.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-7.088000 14.484590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9387 -15.7757 14.2 23.8 97.6 -0.0781 -0.8 8.5 Sco X-1
255.9182 -37.6469 71.0 12.3 21.0 0.0113 0.2 12.3 4U 1700-377
256.4336 -36.4825 9.9 11.2 24.0 0.0810 1.2 3.6 GX 349+2
262.9217 -24.5498 0.0 5.4 122.7 -0.0380 -0.6 12.7 GX 1+4
265.0133 -44.3662 0.0 15.4 -17.8 -0.1065 -1.6 12.6 4U 1735-44
268.5150 -1.4225 15.2 27.6 163.1 -0.0617 -0.8 9.0 SW J1753.5-0127
270.3513 -25.1164 4.6 5.2 -158.0 0.1663 2.6 4.3 GX 5-1
270.4095 -25.7271 4.8 4.8 -152.7 -0.1658 -2.6 5.9 GRS 1758-258
273.8623 -14.1473 10.9 16.4 -174.9 -0.0747 -1.1 10.7 GX 17+2
275.9827 -30.3381 5.7 8.4 -99.8 0.1421 2.0 3.5 H1820-303
285.0449 -24.7728 6.2 17.1 -121.2 0.1333 1.9 8.9 HT1900.1-2455
288.9051 10.9239 6.8 45.4 -169.6 0.2122 1.7 6.4 GRS 1915+105
263.1859 -33.8322 4.3 5.6 7.1 0.1747 2.7 9.8 GX 354-0
284.9992 13.0379 2.6 45.7 -175.7 0.5477 4.4 ------ UNKNOWN
296.2788 -7.9737 0.3 35.1 -142.3 3.7914 42.5 ------ UNKNOWN
304.2812 15.4206 2.4 57.5 -156.9 1.6968 4.9 ------ UNKNOWN
304.5168 -86.5001 2.3 58.3 -24.0 2.0579 5.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
77.484600 838.757100
840.384000 899.036100
900.384000 962.445800
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
262.8265 -24.6603 5.2 36.0 75.5 -3.9000 -2.2 11.2 GX 1+4
264.7885 -44.5059 61.7 45.6 48.6 -0.4453 -0.2 3.9 4U 1735-44
268.2225 -1.4698 5.4 28.7 118.8 2.1188 2.1 8.8 SW J1753.5-0127
270.2505 -24.9829 31.3 30.1 69.6 -0.4157 -0.4 6.1 GX 5-1
270.3188 -25.8745 4.4 30.5 68.0 3.0580 2.6 7.9 GRS 1758-258
274.0342 -14.0842 2.6 22.7 89.5 3.5970 4.4 3.3 GX 17+2
275.9372 -30.4472 5.6 29.5 54.7 2.0067 2.1 4.9 H1820-303
284.8989 -25.0178 5.3 20.2 48.3 1.5039 2.2 9.5 HT1900.1-2455
288.8168 10.9380 0.8 20.3 175.6 9.4514 14.0 1.2 GRS 1915+105
299.5855 35.1768 3.4 43.3 -158.9 4.1291 3.4 1.5 Cyg X-1
308.0409 40.9362 3.0 50.1 -151.3 6.6494 3.9 3.3 Cyg X-3
263.1377 -33.7157 0.0 39.9 62.2 4.3197 2.0 10.3 GX 354-0
291.2825 -20.6954 2.6 13.6 37.4 2.9625 4.5 ------ UNKNOWN
303.7133 -47.1409 2.6 39.7 9.2 4.6292 4.4 ------ UNKNOWN
296.2718 -7.9372 1.2 0.0 -179.6 5.9019 9.3 ------ UNKNOWN
306.6231 -28.4970 3.9 22.7 -7.0 1.8374 3.0 ------ UNKNOWN
Plot creation:
Sat May 30 16:53:19 EDT 2015