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J/PASP/122/1        BVRI light curves of SN 2007gi           (Zhang+, 2010)

Optical observations of the rapidly expanding type Ia supernova 2007gi. Zhang T., Wang X., Li W., Filippenko A.V., Wang L., Zhou X., Brown P.J., Silverman J.M., Steele T.N., Ganeshalingam M., Li J., Deng J., Li T., Qiu Y., Zhai M., Shang R. <Publ. Astron. Soc. Pac., 122, 1-11 (2010)> =2010PASP..122....1Z
ADC_Keywords: Supernovae ; Photometry, UBVRI Abstract: We present optical photometry and spectra for the Type Ia supernova (SN Ia) 2007gi in the nearby galaxy NGC 4036. SN 2007gi is characterized by extremely high-velocity (HV) features of the intermediate-mass elements (Si, Ca, and S), with expansion velocities (vexp) approaching 15500km/s near-maximum brightness (compared to 10600km/s for SNe Ia with normal vexp). SN 2007gi reached a B-band peak magnitude of 13.25±0.04mag with a decline rate of {DELTA}m15(B)(true)=1.33±0.09mag. The B-band light curve of SN 2007gi demonstrated an interesting two-stage evolution during the nebular phase, with a decay rate of 1.16±0.05mag/(100days) during t=60-90days and 1.61±0.04mag/(100days) thereafter. Such behavior was also observed in the HV SN Ia 2006X, and might be caused by the interaction between supernova ejecta and circumstellar material (CSM) around HV SNe Ia. Based on a sample of a dozen well-observed R band (or unfiltered) light curves of SNe Ia, we confirm that the HV events may have a faster rise time to maximum than those with normal vexp. Description: Photometry of SN 2007gi was obtained primarily with the 0.8m Tsinghua-NAOC Telescope (TNT) located at NAOC Xinglong Observatory. Observations of SN 2007gi began on 2007 August 8, 6 days before B-band maximum, and continued for the next 6 months. SN 2007gi was also observed during its early rising phase (from t~-11 to -7days) with the Ultraviolet/Optical Telescope (UVOT) on board the Swift Observatory. Optical spectra of SN 2007gi were obtained primarily with the 3m Shane telescope at Lick Observatory using the Kast double spectrograph. A spectrum was also obtained on 2007 November 12 with the Low Resolution Imaging Spectrometer (LRIS) mounted on the 10m Keck I telescope on Mauna Kea, Hawaii. Objects: ------------------------------------------------ RA (2000) DE Designation(s) ------------------------------------------------ 12 01 23.4 +61 53 34 SN 2007gi = SN 2007gi ------------------------------------------------ File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 62 8 Magnitudes of photometric standards in the SN 2007gi field table2.dat 81 28 Optical photometry of SN 2007gi
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1 I1 --- Seq Star sequential number 3- 8 F6.3 mag Vmag Johnson V magnitude 10- 14 F5.3 mag e_Vmag rms uncertainty on Vmag 16- 20 F5.3 mag B-V Johnson B-V colour index 22- 26 F5.3 mag e_B-V rms uncertainty on B-V 28- 32 F5.3 mag U-B Johnson U-B colour index 34- 38 F5.3 mag e_U-B rms uncertainty on U-B 40- 44 F5.3 mag V-Rc Johnson-Cousins V-Rc colour index 46- 50 F5.3 mag e_V-Rc rms uncertainty on V-Rc 52- 56 F5.3 mag V-Ic Johnson-Cousins V-Ic colour index 58- 62 F5.3 mag e_V-Ic rms uncertainty on V-Ic
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Date UT Date 12- 21 F10.2 d JD Julian date 23- 29 F7.2 d Phase Phase, relative to the epoch of B-band maximum (JD 2454327.02) 31- 36 F6.3 mag Bmag Johnson B magnitude 38- 42 F5.3 mag e_Bmag rms uncertainty on Bmag 44- 49 F6.3 mag Vmag Johnson V magnitude 51- 55 F5.3 mag e_Vmag rms uncertainty on Vmag 57- 62 F6.3 mag Rcmag ?=- Cousins R magnitude 64- 68 F5.3 mag e_Rcmag ?=- rms uncertainty on Rmag 70- 75 F6.3 mag Icmag ?=- Cousins I magnitude 77- 81 F5.3 mag e_Icmag ?=- rms uncertainty on Imag
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 30-Mar-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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