Observers : Laurent Le Guillou, Sylvain Baumont, Ayan Mitra Support team : Pierre François Leget, Nicolas Chotard TAT : K. Maguire, J. Polshaw Clear sky, strong wind from North-East, 55% humidity Moon at 2nd quarter, 65% illumination, setting at 5:20 The night was probably photometric, but we couln't get more standard fields due to pointing restriction. CALIBRATIONS and WEATHER : - Evening : EFOSC_bias, EFOSC_FlatSpec, EFOSC_SpecArc - 23:30 Sunset, strong wind above 15m/s, NTT DOME stays CLOSED, no SkyFlat. - 03:25 The wind settled betwen 12 and 15m/s, NTT DOME OPENED. => Pointing restriction towards North-East, so we had to discard the highest priority objects PSNJ1409+1731 and LSQ15kp. Gasp! We then had to select declining objects (West), and towards the South. - 08:10 The wind speed raised quickly to 20m/s. NTT DOME CLOSED. - 09:11 Astronomical twilight. End of night. - Morning : Dome still closed. No SkyFlat SCIENCE OBSERVATIONS : - 03:33 image analysis and focus - 03:52 ASASSN-14ha Follow-up, Bi:2x150s VR:200s Airmass 2.1, seeing 1.2", 76º from the moon - 04:14 OGLE-2014-SN-073 Follow-up, V:3x300s Ri:2x250s Airmass 1.8, seeing 1.5" to 0.9", 81º from the moon - 04:56 Photometric Standard Field PG1047, BVRi 57% humidity, temperature 11º, airmass 1.15 It is at the limit of the pointing restrictions. - 05:05 STD LTT3864, Gr11 Gr13 Gr16, slit 1" and 1.5", airmass 1.01 - 05:44 OGLE-2015-SN-060 Classification, Gr13:1200s, slit 1.5" Airmass 2.4, seeing 1.1" to 1.6", noisy spectrum NOTE : The OGLE finding chart (max. brigthness, the one displayed in the Marshall) is wrong. The OGLE reference image is OK. => SN-Ia, maybe 91-T like, z ~ 0.07 - 06:13 SNHiTS15I Classification, Gr13:1200s, slit 1.5" Airmass 1.3, seeing 1.5" to 2", noisy spectrum => Probably SN-Ia, z ~ 0.15 - 06:43 SNHiTS15J Classification, Gr:2700s, slit 1.5" Airmass 1.7, seeing 2" to 1.5", noisy spectrum The SN is the faint trace on the left. => Probably SN-Ia pre-max, z_gal = 0.11 - 07:37 SN2014ad Follow-up, Gr13:2700s, slit 1.5" Airmass 1.2, seeing 2" to 1.4". The slit positioning was tricky, and might be inaccurate. We had to abort the exposure after 1874s due to wind above 15m/s. The spectrum is probably useless... CONCLUSIONS : Follow-up * ASASSN-14ha : BVRi * OGLE-2014-SN-073 : VRi * SN2014ad : Gr13, bad seeing, probably useless Classifications * OGLE-2015-SN-060 : SN-Ia, z ~ 0.07 * SNHiTS15I : SN-Ia?, z ~ 0.15 * SNHiTS15J : SN-Ia?, z_gal = 0.11 |
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