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X-Ray Detection of SN 2008bo with Swift XRT

ATEL # 1481; S. Immler (NASA/CRESST/GSFC) and P. J. Brown (PSU), on behalf of the Swift satellite team
on 16 Apr 2008; 21:24 UT
Password Certification: Stefan Immler (

Subjects: X-ray, Nova, Supernova

Supernova (SN) 2008bo in NGC 6643 (CBET #1324, #1325, ATel #1463, #1477) is detected in X-rays with Swift X-Ray Telescope (XRT) at a 7.1-sigma level of significance in merged 25.4 ks XRT data obtained between 2008-04-04.71 UT and 2008-04-14.67 UT. The PSF, dead-time, and vignetting corrected XRT net count rate is (2.7+/-0.4)E-03 cts/s, corresponding to an unabsorbed (0.2-10 keV band) X-ray flux of (1.5+/-0.2)E-13 erg/cm/cm/s and a luminosity of (7.9+/-1.2)E39 erg/s for an adopted thermal plasma spectrum with a temperature of kT = 10 keV, a Galactic foreground column density of N_H = 5.45E20 (Dickey & Lockman, 1990, ARAA, 28, 215), and a distance of 21 Mpc (z=0.004950, NED; H_o = 71 km/s/Mpc, Omega_M = 1/3, Omega_L = 2/3).

Binning the 6 epochs of data into two observations shows a significant brightening in X-ray flux from (0.8+/-0.3)E-13 erg/cm/cm/s (2008-04-04 to 2008-04-08) to (1.9+/-0.3)E-13 erg/cm/cm/s (2008-04-10 to 2008-04-14).

The Swift XRT X-ray detection of SN 2008bo confirms substantial circumstellar interaction as indicated by the tentative detection in VLA radio observations (ATel #1477).

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R. E. Rutledge , Editor
ATEL Mirror v1.0 Updates