GCN Circular 7163

Subject

Early OT detection of XRF in NGC 2770 in Asiago frames

Event

SN2008D

Date

2008-01-11T11:08:16Z (18 years ago)

Edited On

2025-05-05T20:51:46Z (5 months ago)

From

Stefano Valenti at U di Ferrara,Italy <valenti@fe.infn.it>

Edited By

Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov>

S. Valenti, M. Turatto, H. Navasardyan, S. Benetti and E. Cappellaro report:

The optical counterpart of the transient source in NGC 2270 (cfr. GCN 7159Loading...
 
 )
was present on images of SN2007uy taken with the 1.8m telescope of the Asiago
Observatory (+AFOSC) on Jan. 10.01 (10.5h after the Swift detection) and
not visible
(limit magnitude  ~ 21) on Jan.  7.00.
The transient was of mag ~ 19 in V,   fainter than SN 2007uy by 3 and 2.8
magnitude in V and R,
respectively.  Following the report of J. Deng and Y. Zhu (GCN7160Loading...
 
 ) that
the transient was roughly 2 magnitudes  fainter than SN2007uy on Jan. 10.76,
in R band, it seems that the luminosity of the transient is rising
rapidly, supporting the very fortunate possibility  that Swift has
observed, in
real time, the explosion of a massive star. A image of the transient can
be found at:
http://www.eso.org/~svalenti/homepage/transient.jpg