GCN Circular 7181
Subject
XRF 080109/SN 2008D: PROMPT Optical Imaging
Date
2008-01-14T21:52:37Z (18 years ago)
From
Melissa Nysewander at STScI <mnysewan@stsci.edu>
M. Nysewander (STScI), D. Reichart, K. Ivarsen, J.A. Crain, A. LaCluyze (UNC) report:
We observed the optical transient of XRF 080109/SN 2008D in NGC
2770 (Berger & Soderberg, GCN 7159; Deng & Zhu, 7160) on
January 12 & 13 with two PROMPT telescopes. Observations were
taken under good conditions, but at high airmass.
On both nights, the P5 telescope took continuous 60s R-band
exposures for ~3 hrs, while P4 cycled through repeated sequences of
15x60s in BVI for a total of ~1 hr in each filter.
Assuming the star at RA: 09:09:37.28 Dec: +33:09:35.1 (to be
consistent with D'Elia et al. GCN 7162) to have B=17.25, V=16.71,
R=17.20, and I=16.67 (NOMAD and USNOB), we find the following
preliminary magnitudes for the OT at Jan 12.3 and 13.3:
Filter: Exposure: Mag1: Mag2:
B 12 x 60s 18.6 18.3
V 5 x 60s 17.9 17.7
R 5 x 60s 18.0 18.0
I 5 x 60s 17.2 17.1
These values may suggest a slight brightening over the two nights, but are consistent with no variation.
Observations are ongoing.