TITLE: GCN CIRCULAR NUMBER: 35666 SUBJECT: GRB 240204A: Swift detection of a burst DATE: 24/02/04 15:33:54 GMT FROM: K.L. Page at U Leicester <klp5@leicester.ac.uk> S. B. Cenko (GSFC), C. Gronwall (PSU), J.D. Gropp (PSU), J. A. Kennea (PSU) and K. L. Page (U Leicester) report on behalf of the Neil Gehrels Swift Observatory Team: Swift/BAT triggered on the Fermi/GBM reported long GRB 240204A (GCN #35664). Due to a telemetry outage, no realtime BAT data are available. The XRT began observing the field at 15:10:12.2 UT, 154 seconds after the Fermi/GBM trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 104.18190, 1.02767 which is equivalent to: RA(J2000) = 06h 56m 43.66s Dec(J2000) = +01d 01' 39.6" with an uncertainty of 4.0 arcseconds (radius, 90% containment). This position may be improved as more data are received; the latest position is available at https://www.swift.ac.uk/sper. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 6.45 x 10^21 cm^-2 (Willingale et al. 2013). Due to a telemetry outage, there are no UVOT data available at this time. Burst Advocate for this burst is S. B. Cenko (brad.cenko AT nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/) View this GCN Circular online at https://gcn.nasa.gov/circulars/35666. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...