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ATEL # 1668; F. E. Marshall (NASA/GSFC), C. B. Markwardt (U.Md./CRESST/NASA/GSFC) and D. Chakrabarty (MIT)
on 20 Aug 2008; 8:19 UT
Password Certification: Craig B. Markwardt (firstname.lastname@example.org)
Subjects: Optical, X-ray, Binaries, Neutron Stars, Pulsars, Transients
For the millisecond X-ray pulsar IGR J00291+5934 (ATEL #1660, #1664, #1665, #1666, #1667), we report on UVOT analysis of the Swift observation taken 2008-08-15 at 14:50 UT (Markwardt & Swank, ATEL #1664).
IGR J00291+5934 was detected in the UVW2 filter of UVOT. The UVW2 filter has a central wavelength of 1928 Angstroms. The observed magnitude was 19.6 +/- 0.2 in the UVOT photometric system (Poole et al, 2008, MNRAS 383,627), uncorrected for the expected reddening, which corresponds to E(B-V) = 0.8 (Torres et al. 2008, ApJ, 672, 1079). Comparison with contemporaneous optical measurements (Russell et al. ATEL #1666) suggests a very blue spectrum for the source. Further Swift observations of the source are planned.