Skip to main content
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 18671

GRB 151205C: Swift-XRT observations
2015-12-06T22:48:06Z (8 years ago)
Andrea Melandri at INAF-OAB <>
A. Melandri, P. D'Avanzo (INAF-OAB) A. D'Ai (INAF-IASFPA), J.A. Kennea
(PSU), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), K.L. Page (U.
Leicester), C. Pagani (U. Leicester), A.P. Beardmore (U. Leicester), A.
Maselli  (INAF-IASFPA) and P.A. Evans (U. Leicester) report on behalf
of the Swift-XRT team:

Swift-XRT has performed follow-up observations of the MAXI-detected
burst GRB 151205C (Nakajima et al. GCN Circ. 18666) in a series of
observations tiled on the sky. The total exposure time is 2.5 ks,
distributed over 7 tiles; the maximum exposure at a single sky location
was 790 s. The data were collected between T0+11.1 ks and T0+22.8 ks,
and are entirely in Photon Counting (PC) mode. 

No X-ray sources have been detected. The 3-sigma upper limit in the
field (not including the regions where the tiles overlap) ranges from
~0.02 to ~0.03 ct s^-1, corresponding to a 0.3-10 keV observed flux of
7.6e-13 to 1.1e-12 erg cm^-2 s^-1 (assuming a typical GRB spectrum).

The results of the XRT-team automatic analysis of the tiled XRT
observations, including a position-specific upper limit calculator, are
available at

This circular is an official product of the Swift-XRT team.
Looking for U.S. government information and services? Visit