The Giant Metrewave Radio Telescope (GMRT), India observed the field of XRF 080109/SN2008D (GCN 7159, GCN 7178) on 11 Feb. 2008 (between 14.0 UT and 19.0 UT) at 1280 MHz using a bandwidth of 32 MHz. The radio transient was not detected down to a 3-sigma upper limit of 165 microJy at the source location....Full Text

We continued observations of the optical counterpart to X-ray transient in NGC 2770, SN2008D (GCNR 110.1, GCN 7160, GCN 7161) with Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National Observatory, Turkey) in 26 (02:50-04:50UT), 27 (01:00-04:00UT), 28 (04:05UT) Jan 2008 using ANDOR TE CCD (DW-436)....Full Text

We obtained an optical spectrum of SN2008D (crf. Li & Filippenko, CBET 1202; Soderberg et al., GCN 7165; Malesani et al., GCN 7169; Valenti et al., GCN 7171; Blondin et al., CBET 1205, see also GCN 7160-GCN 7168). The spectrum (range 350-1000 nm) taken on Jan 25.21 with the VLT+FORS2 dereddened by an E(B-V)= 0.5 is identical to the spectrum of SN 1999ex -1 day before maximum (Hamuy...Full Text

The Chandra X-ray Observatory performed a 17.9 ks ACIS-S3 observation of the field of SNe 2008D (associated with XRB 010809; Berger & Soderberg, GCN 7159, ATEL 1353; Kong & Maccarone, ATEL 1355) and 2007uy (Nakano et al., IAUC 8908) starting at 2008 Jan 19 20:41 UT....Full Text

"We obtained optical spectra of SN 2008D (Li & Filippenko, CBET 1202; Soderberg et al., GCN 7165; Malesani et al., GCN 7169; Valenti et al., GCN 7171; Blondin et al., CBET 1205, see also GCN 7160-GCN 7168). A spectrum (range 350-970 nm) taken on Jan 21.22 UT with the ARC 3.5-m telescope (+ DIS) at APO shows it to be a type-Ib supernova. The fully reduced spectrum shows the development...Full Text

The optical counterpart to X-ray transient in NGC 2770, SN2008D (GCN Rep. 110.1, GCN 7160, GCN 7161) was observed also with Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National Observatory, Turkey) during the first two nights after the XRF....Full Text

The position of XRF 080109 / SN 2008D was observed by Giant Meterwave Radio Telescope (GMRT) as ToO at 1280 MHz. The observation took place from UT 20.68 to 21.00 January, 2008. It was started after 11.11 days of the beginning of the burst (GCN 7172). The preliminary analysis suggest that the upper limit of the flux density at the position of XRF 080109 (GCN 7190, GCN 7178) is 160 microJy...Full Text

"We observed the position of the NGC 2770 transient (GCN 7159) at 1.4 GHz with the Westerbork Synthesis Radio Telescope at January 18 19.30 UT to January 19 6.86 UT. The galaxy NGC 2770 is resolved and the flux density of the galaxy core is ~4.4 mJy. The flux at the position of XRF 080109 / SN 2008D (GCN 7178) is ~1.1 mJy. There is no significant detection of a point source at this position...Full Text

"We used the ARC 3.5-m telescope at Apache Point Observatory to obtain spectroscopic observations of the X-ray transient in NGC2770 (GCN 7159). We obtained 4x1200 sec exposures with the DIS red+blue cameras providing a wavelength range of 3600-9000A. The spectra therefore cover a wide range of nebular emission lines relevant for metallicity measurements (i.e. [OII], H-beta, [OIII], H-alpha...Full Text

We made infrared photometry at Mt. Abu 1.2 m Cassegrain telescope using NICMOS camera on the Transient XRF 080109/SN 2008D in NGC 2770 (Berger & Soderberg, GCN 7159; Modjaz et al., GCN 7175 and Antonelli et al., GCN 7177) during 2008 Jan 11, Jan 13 and Jan 15. Sky conditions were good during the first two nights but not so much on the third. The calibration was made on the two bright stars...Full Text

"We observed the position of the NGC 2770 transient (GCN 7159) at 4.9 GHz with the Westerbork Synthesis Radio Telescope at January 15 19.38 UT to January 16 7.06 UT. We detect a source with a flux density of 369 +/- 33 microJy at the position of the radio counterpart reported at 8.46 GHz (GCN 7178)....Full Text

The host galaxy of SN 2008D, NGC 2770, is included in the latest version of our catalog of supernova hosts:...Full Text

We obtained near-infrared spectra of supernova 2008D (ATEL 1353; GCN 7160) with the NASA Infrared Telescope Facility (IRTF) and SPEX instrument. The data were taken January 14.4 UT and cover the wavelength range 0.7 to 2.5 microns. A preliminary reduction of the spectrum shows a strong absorption feature at 1.01 micron. This feature is seen in several other type Ic events (e.g. SN 1994I, Millard...Full Text

We observed the optical transient of XRF 080109/SN 2008D in NGC 2770 (Berger, Soderberg, GCN 7159; Deng, Zhu, GCN 7160) on January 11,12,13 with CrAO 2.6 telescope (ZTSh). On Jan. 11 observations were completed in BVRI and on Jan. 12-13 in BR filters under good weather conditions....Full Text

We acquired a spectrum of the galaxy (or galaxy pair) NGC 2770B, located ~3 arcmin West of NGC 2770, the host galaxy of XRF 080109 / SN 2008D (Berger & Soderberg, ATEL 1353; Deng & Zhu, GCN 7160). Observations were carried out with the Nordic Optical Telescope, starting on 2007 Jan 15.213 UT, for a total exposure time of 10 min....Full Text

Regular Swift UVOT monitoring of the optical counterpart to the X-ray transient in NGC 2770, SN 2008D (ATEL 1353), shows a brightening in the v and b filters by 0.4 mag and 0.2 mag, respectively, over a 3-day period (2008-01-13 01:24:08 UT to 2008-01-15 01:25:19 UT). This rise confirms the onset of a supernova component (GCN 7183). The following magnitudes are measured for observations starting...Full Text

We observed SN 2008D with the Nordic Optical Telescope on Jan 13.05 and Jan 15.16 UT. Spectra were acquired covering the range 3700-7500 AA....Full Text

We observed the field of XRF 080109/SN2008D (GCN 7159, GCN 7160, GCN 7169) with UKIRT/UFTI on 2008-01-12 (13 UT) and on 2008-01-15 (14 UT) in good conditions, using the JHK filters on each occasion. Between the two epochs we estimate that the optical transient brightened by approximately 0.35+/-0.05 mag in each band, confirming the onset of a slowly rising supernova component. ...Full Text

Optical observations were made of the transient X-ray source in NGC 2270 (cfr. GCN 7159) on 11, 12 and 14 Jan. using the 37cm "Rigel" telescope based in southern Arizona. We used GSC 2495:1420 as a reference for differential photometry, assigning it a nominal magnitude of 14.3. We plan further monitoring observations including short photometric scans of Tycho-2 stars in the field, allowing...Full Text

1 Introduction

During Swift observations of SN 2007uy beginning at 13:32:48.9 UT on 2008-01-09 (Obs ID 00031081002), a transient X-ray source was serendipitously identified and reported on Jan 10.58 (Berger & Soderberg, GCN 7159 and ATEL 1353; Kong & Maccarone, ATEL 1355). The source was observed to rise to a maximum flux about 65 seconds after the observation began, and then subsequently decay; the observed duration of the event is roughly 600 seconds. The X-ray emission was already in progress when this observation began, so the start time of the event is uncertain. The object was within the BAT field of view for approximately 30 minutes prior to the observation in which it was first detected (Burrows et al., GCN 7179), but never triggered the instrument. Target of opportunity Swift follow-up observations were promptly scheduled to reveal the nature of the transient.

The first announcement of an optical counterpart was reported by Deng & Zhu (GCN 7160) on Jan 10.76 UT, and confirmed by NOT observations on Jan 11.0 UT (Thoene et al., GCN 7161).

A comparison of Asiago Observatory data taken Jan 7.0 and Jan 10.0 indicated that the optical counterpart brightened rapidly (Valenti et al., GCN 7163). Similarly, an early analysis of UVOT data from Jan 11.11 revealed a counterpart which had brightened since the previous Swift observations on Jan 9.6 (Kong et al., GCN 7164).

Spectroscopic observations of the optical transient were first reported by Soderberg et al. (GCN 7165), taken on Jan 11.3 UT with Gemini-N/GMOS and suggesting broad features possibly related to an emerging supernova. Malesani et al. (GCN 7169) classified the supernova (now designated SN 2008D) as type Ibc, based on VLT spectroscopy on Jan 11.3. Valenti et al. (GCN 7171) confirmed the type Ic classification with TNG spectra taken on Jan 11.1

A refined analysis of Swift follow-up data beginning Jan 11.12 revealed an X-ray counterpart (Page et al., GCN 7170; see also Section 3) in addition to the UVOT counterpart (Immler et al., GCN 7168; see also Section 4) which was detected in v, b, u, uvw1 and uvm2 filters. Soderberg reported the discovery of a radio counterpart by the VLA (GCN 7178), providing the most accurate position for this transient:

RA (J2000): 09h 09m 30.6506s ± 0.0008 Dec (J2000): +33o 08 20.14 ± 0.01

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