Possible new X-ray burst source detected by HETE

ATel #516; Roland Vanderspek (MIT), Ed Morgan (MIT), Geoff Crew (MIT), Carlo Graziani (UChicago), Motoko Suzuki (RIKEN), for the HETE Team
on 14 Jun 2005; 20:28 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Edward Morgan (ehmorgan@mit.edu)

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The HETE Fregate, WXM and SXC instruments detected burst H3804 at 11:22 UT on 14 June 2005. The burst is soft (all photons < 30 keV), has a FRED-like profile, and exhibits the general spectral and temporal characteristics of a radius-expansion X-ray burst. H3804 is localized by the WXM and SXC to a circle of radius 80" centered at RA = 19h 00m 6.4s, Dec = -24d 54' 54.7' (J2000). H3804 is situated within 15 degrees of the galactic center: l=11, b=-13. It does not appear to coincide with any entry for an X-ray source in the SIMBAD catalog. Thus, it is very likely to be a new, previously uncatalogued XRB, and not an XRF or a GRB, although we cannot absolutely exclude that possibility. Followup observations are encouraged.