Click here for the BAT GCN circular template
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
289.3677 -15.0878 0.0071 41.7138 163.9018 4.0752894 27.177 TRIG_00598819
Foreground time interval of the image:
-22.840 15.885 (delta_t = 38.725 [sec])
Background time interval of the image:
-239.216 -22.840 (delta_t = 216.376 [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 -22.840 sec. to 178.148 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33528 ( -0.0401106 0.0399804 )
Norm@50keV : 6.62100E-03 ( -0.000136079 0.000135857 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.43 using 59 PHA bins.
# Reduced chi-squared = 0.8322 for 57 degrees of freedom
# Null hypothesis probability = 8.127998e-01
Photon flux (15-150 keV) in 201 sec: 0.795263 ( -0.0187064 0.0187801 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30414e-05 ( -2.68763e-07 2.69043e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -22.840 sec. to 178.148 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33220 ( )
Epeak [keV] : 9999.30 ( -9999.33 -9999.33 )
Norm@50keV : 6.64740E-03 ( -0.000134768 0.000434808 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.57 using 59 PHA bins.
# Reduced chi-squared = 0.8495 for 56 degrees of freedom
# Null hypothesis probability = 7.812283e-01
Photon flux (15-150 keV) in 201 sec: 0.794736 ( -0.018516 0.0188 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30379e-05 ( -2.64717e-07 2.61702e-07 ) ergs/cm2
Band function
Time interval is from -22.840 sec. to 178.148 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.05211 ( 1.05211 1.05211 )
beta : -1.33527 ( -0.0399846 0.04011 )
Epeak [keV] : 41.3173 ( -41.3173 -41.3173 )
Norm@50keV : 1.30599E-02 ( -0.00603425 538184 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.43 using 59 PHA bins.
# Reduced chi-squared = 0.8624 for 55 degrees of freedom
# Null hypothesis probability = 7.558695e-01
Photon flux (15-150 keV) in 201 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] : 20.1267 ( )
R^2/D10^2 : 3.27299E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 613.05 using 59 PHA bins.
# Reduced chi-squared = 10.755 for 57 degrees of freedom
# Null hypothesis probability = 3.451875e-94
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.124e-07 2.502e-08
25- 50 2.563e-06 7.839e-08
50-150 7.704e-06 2.281e-07
15-150 1.078e-05 2.181e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 3.39960 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 187.23 using 59 PHA bins.
# Reduced chi-squared = 3.2847 for 57 degrees of freedom
# Null hypothesis probability = 8.824541e-16
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.702e-06 4.110e-08
25- 50 3.273e-06 8.040e-08
50-150 7.179e-06 1.608e-07
15-150 1.215e-05 2.774e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.18452 (-0.594826 0.626549)
R1^2/D10^2 : 0.454228 (-0.100763 0.137673)
kT2 [keV] : 35.3022 (-2.75712 3.45977)
R2^2/D10^2 : 4.36749E-03 (-0.00111031 0.00132279)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.49 using 59 PHA bins.
# Reduced chi-squared = 0.9362 for 55 degrees of freedom
# Null hypothesis probability = 6.094970e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.278e-06 9.638e-08
25- 50 3.056e-06 1.166e-07
50-150 8.774e-06 4.342e-07
15-150 1.311e-05 5.367e-07
Peak spectrum fit
Power-law model
Time interval is from 121.956 sec. to 122.956 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24366 ( -0.0703834 0.070413 )
Norm@50keV : 5.12170E-02 ( -0.00200799 0.0020073 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.07 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 57 degrees of freedom
# Null hypothesis probability = 4.723094e-01
Photon flux (15-150 keV) in 1 sec: 6.05141 ( -0.242089 0.242267 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.13435e-07 ( -2.28394e-08 2.293e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 121.956 sec. to 122.956 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00740 ( -0.294231 0.256629 )
Epeak [keV] : 224.843 ( -95.7815 -224.844 )
Norm@50keV : 6.63390E-02 ( -0.0158646 0.0244595 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.95 using 59 PHA bins.
# Reduced chi-squared = 0.9812 for 56 degrees of freedom
# Null hypothesis probability = 5.146848e-01
Photon flux (15-150 keV) in 1 sec: 5.97938 ( -0.25581 0.25557 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.0508e-07 ( -2.5253e-08 2.5076e-08 ) ergs/cm2
Band function
Time interval is from 121.956 sec. to 122.956 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.776882 ( -0.344177 5.37077 )
beta : -1.39679 ( 1.3969 0.17033 )
Epeak [keV] : 120.763 ( -84.1955 1644.06 )
Norm@50keV : 8.96459E-02 ( -0.0352665 0.154498 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.73 using 59 PHA bins.
# Reduced chi-squared = 0.9768 for 55 degrees of freedom
# Null hypothesis probability = 5.234290e-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] : 17.7594 ( )
R^2/D10^2 : 0.404370 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 168.54 using 59 PHA bins.
# Reduced chi-squared = 2.9569 for 57 degrees of freedom
# Null hypothesis probability = 5.848140e-13
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.564e-08 1.890e-09
25- 50 1.174e-07 6.400e-09
50-150 2.678e-07 2.000e-08
15-150 4.109e-07 1.935e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 24.8922 (-0.987707 0.987573)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 107.13 using 59 PHA bins.
# Reduced chi-squared = 1.8794 for 57 degrees of freedom
# Null hypothesis probability = 6.616242e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.200e-08 2.525e-09
25- 50 1.193e-07 5.100e-09
50-150 2.616e-07 1.070e-08
15-150 4.428e-07 1.985e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.86966 (-1.65075 1.7844)
R1^2/D10^2 : 2.44343 (-0.942427 2.01959)
kT2 [keV] : 34.0425 (-6.72719 13.7663)
R2^2/D10^2 : 3.78772E-02 (-0.0239446 0.0419395)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.78 using 59 PHA bins.
# Reduced chi-squared = 1.105 for 55 degrees of freedom
# Null hypothesis probability = 2.756275e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.347e-08 6.355e-09
25- 50 1.181e-07 1.214e-08
50-150 3.442e-07 7.720e-08
15-150 5.058e-07 7.395e-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: 1.17546 ( -0.0966549 0.0951753 )
Norm@50keV : 7.48801E-03 ( -0.000393676 0.000392017 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.03 using 59 PHA bins.
# Reduced chi-squared = 0.8251 for 57 degrees of freedom
# Null hypothesis probability = 8.240623e-01
Photon flux (15-150 keV) in 38.72 sec: 0.876025 ( -0.0498639 0.0500975 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.9623e-06 ( -1.55079e-07 1.55395e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17407 ( -0.100262 0.0931345 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 7.52255E-03 ( -0.000391642 0.00198645 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.07 using 59 PHA bins.
# Reduced chi-squared = 0.8405 for 56 degrees of freedom
# Null hypothesis probability = 7.966625e-01
Photon flux (15-150 keV) in 38.72 sec: 0.877022 ( -0.051299 0.037331 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.96162e-06 ( -1.53804e-07 1.54539e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.925206 ( 0.925206 0.925206 )
beta : -1.17546 ( -0.0951081 0.0966662 )
Epeak [keV] : 50.6913 ( -50.6913 -50.6913 )
Norm@50keV : 1.38024E-02 ( -0.0067034 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.03 using 59 PHA bins.
# Reduced chi-squared = 0.8551 for 55 degrees of freedom
# Null hypothesis probability = 7.689841e-01
Photon flux (15-150 keV) in 38.72 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) = 2.96e-06
S(50-100 keV) = 4.69e-06
T90 vs. Hardness ratio plot
T90 = 154.111999928951 sec.
Hardness ratio (energy fluence ratio) = 1.58446
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.41585
Count Ratio (50-100 keV) / (15-25 keV) = 1.21136
Mask shadow pattern
IMX = -8.564446874304327E-01, IMY = -2.471704571567579E-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:
-239.216000 -22.840000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.3244 -60.6096 11.8 50.1 3.2 0.4465 1.0 0.8 Cen X-3
186.7299 -62.7983 2.5 42.7 7.7 1.4707 4.6 2.6 GX 301-2
256.0208 -37.8326 1.8 22.6 98.8 1.7734 6.5 1.8 4U 1700-377
256.4436 -36.4107 4.5 23.7 101.3 0.7502 2.5 0.8 GX 349+2
262.8256 -24.7152 5.6 32.6 121.5 -0.7749 -2.1 10.2 GX 1+4
264.6517 -44.5791 111.3 13.5 105.6 0.0190 0.1 8.7 4U 1735-44
270.3416 -25.1413 3.6 30.9 134.1 0.9915 3.2 4.9 GX 5-1
270.3496 -25.6025 6.0 30.4 134.0 0.6063 2.0 8.8 GRS 1758-258
273.9621 -14.1687 3.8 41.5 141.3 1.6290 3.0 8.3 GX 17+2
275.9595 -30.5580 0.0 25.1 143.8 0.2650 1.2 11.6 H1820-303
285.1332 -25.0264 20.5 31.2 160.2 0.1565 0.6 8.3 HT1900.1-2455
262.7581 -33.8133 4.2 23.9 115.7 -0.7328 -2.8 11.6 GX 354-0
265.6340 -27.7539 1.5 29.0 124.8 2.2836 7.8 ------ UNKNOWN
311.0286 -11.7755 3.1 51.3 -169.7 2.1383 3.7 ------ UNKNOWN
60.0640 -72.9153 2.3 49.0 -48.1 5.6383 5.1 ------ UNKNOWN
29.3350 -70.9451 3.2 44.8 -59.9 4.1628 3.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-22.840000 15.884600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.4619 -60.6758 8.3 50.0 3.2 0.2385 1.4 5.3 Cen X-3
186.6552 -62.7708 61.3 42.8 7.7 0.0235 0.2 0.0 GX 301-2
255.9938 -37.8527 201.6 22.6 98.7 -0.0059 -0.1 0.6 4U 1700-377
256.4351 -36.4239 38.9 23.6 101.3 0.0307 0.3 0.1 GX 349+2
262.8435 -24.7948 5.2 32.5 121.5 -0.3225 -2.2 9.5 GX 1+4
264.9811 -44.4096 3.6 13.5 106.9 -0.2658 -3.2 10.5 4U 1735-44
270.1545 -25.1675 3.8 30.9 133.7 0.3719 3.0 8.8 GX 5-1
270.2801 -25.5591 0.0 30.5 133.9 -0.2480 -2.0 11.1 GRS 1758-258
274.1547 -14.0722 8.6 41.6 141.6 0.2781 1.3 8.9 GX 17+2
275.8653 -30.2044 5.1 25.5 143.7 0.2194 2.3 10.2 H1820-303
284.9841 -24.8000 37.6 31.4 159.9 -0.0319 -0.3 7.8 HT1900.1-2455
262.7779 -33.8635 8.1 23.8 115.7 0.1398 1.4 10.7 GX 354-0
233.0933 -30.2884 1.9 39.7 76.6 1.9005 6.0 ------ UNKNOWN
289.3678 -15.0878 0.4 41.7 163.9 4.0754 27.2 ------ UNKNOWN
314.9997 -50.8321 2.8 23.1 -120.5 0.3678 4.1 ------ UNKNOWN
319.1089 -13.4402 2.5 53.3 -159.8 1.0543 4.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
87.084590 962.831000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
256.0008 -37.8519 2.2 37.2 58.4 7.6824 5.3 0.8 4U 1700-377
256.4330 -36.3229 5.3 36.2 60.4 3.2812 2.2 6.0 GX 349+2
263.0202 -24.8564 6.7 26.6 76.8 1.4153 1.7 6.7 GX 1+4
264.7205 -44.5187 5.9 36.1 42.8 -2.1901 -2.0 4.2 4U 1735-44
268.2106 -1.3403 0.0 25.0 133.9 0.7411 1.0 11.6 SW J1753.5-0127
270.3131 -25.0561 2.1 20.4 70.4 4.2024 5.6 2.1 GX 5-1
270.3642 -25.7431 3.4 20.7 68.6 2.4716 3.4 3.3 GRS 1758-258
274.0122 -13.9778 2.4 14.9 104.9 2.8332 4.8 3.5 GX 17+2
276.0382 -30.4226 4.2 19.6 48.8 1.6549 2.8 6.7 H1820-303
284.9790 -24.7784 4.9 10.5 34.9 1.6146 2.4 9.1 HT1900.1-2455
288.7988 10.9434 1.1 26.1 -168.8 7.0163 10.9 0.1 GRS 1915+105
299.5945 35.1887 0.9 51.2 -156.8 25.8510 13.2 0.8 Cyg X-1
262.8579 -33.9122 10.6 30.4 59.5 1.1301 1.1 8.0 GX 354-0
265.6515 -27.7351 1.0 25.4 68.7 9.4221 11.7 ------ UNKNOWN
277.3451 -23.8020 1.8 14.3 63.1 3.9439 6.5 ------ UNKNOWN
282.1905 -32.3210 2.2 18.4 32.0 3.1714 5.2 ------ UNKNOWN
279.9270 1.2949 2.9 18.9 162.0 2.3874 4.0 ------ UNKNOWN
289.3712 -15.0994 0.4 0.0 170.6 15.7951 25.8 ------ UNKNOWN
302.7586 -19.3199 2.4 13.4 -57.4 2.7460 4.7 ------ UNKNOWN
326.0010 -24.2911 3.9 35.6 -56.8 3.1924 3.0 ------ UNKNOWN
301.6130 41.6594 3.9 57.9 -156.8 14.5217 2.9 ------ UNKNOWN
UNKNOWN
UNKNOWN
Plot creation:
Sat May 30 13:34:12 EDT 2015