156 research outputs found
The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0
The All-Sky Automated Survey for Supernovae (ASAS-SN) is working towards
imaging the entire visible sky every night to a depth of V~17 mag. The present
data covers the sky and spans ~2-5~years with ~100-400 epochs of observation.
The data should contain some ~1 million variable sources, and the ultimate goal
is to have a database of these observations publicly accessible. We describe
here a first step, a simple but unprecedented web interface
https://asas-sn.osu.edu/ that provides an up to date aperture photometry light
curve for any user-selected sky coordinate. Because the light curves are
produced in real time, this web tool is relatively slow and can only be used
for small samples of objects. However, it also imposes no selection bias on the
part of the ASAS-SN team, allowing the user to obtain a light curve for any
point on the celestial sphere. We present the tool, describe its capabilities,
limitations, and known issues, and provide a few illustrative examples.Comment: 8 pages, 9 figures, submitted to PAS
Frameless Image-Guided Radiosurgery for Trigeminal Neuralgia
Background: Frameless image-guided radiosurgery (IGRS) is a safe and effective noninvasive treatment for trigeminal neuralgia (TN). This study evaluates the use of frameless IGRS to treat patients with refractory TN.
Methods: We reviewed the records of 20 patients diagnosed with TN who underwent frameless IGRS treatments between March 2012 and December 2013. Facial pain was graded using the Barrow Neurological Institute (BNI) scoring system. The initial setup uncertainty from simulation to treatment and the patient intrafraction uncertainty were measured. The median follow-up was 32 months.
Results: All patients\u27 pain was BNI Grade IV or V before the frameless IGRS treatment. The mean intrafraction shift was 0.43 mm (0.28-0.76 mm), and the maximum intrafraction shift was 0.95 mm (0.53-1.99 mm). At last follow-up, 8 (40%) patients no longer required medications (BNI 1 or 2), 11 (55%) patients were pain free but required medication (BNI 3), and 1 (5%) patient had no pain relief (BNI 5). Patients who did not have prior surgery had a higher odds ratio for pain relief compared to patients who had prior surgery (14.9, P = 0.0408).
Conclusions: Frameless IGRS provides comparable dosimetric and clinical outcomes to frame-based SRS in a noninvasive fashion for patients with medically refractory TN
The ASAS-SN Catalog of Variable Stars III: Variables in the Southern TESS Continuous Viewing Zone
The All-Sky Automated Survey for Supernovae (ASAS-SN) provides long baseline
( yrs) light curves for sources brighter than V mag across
the whole sky. The Transiting Exoplanet Survey Satellite (TESS) has started to
produce high-quality light curves with a baseline of at least 27 days,
eventually for most of the sky. The combination of ASAS-SN and TESS light
curves probes both long and short term variability in great detail, especially
towards the TESS continuous viewing zones (CVZ) at the ecliptic poles. We have
produced million V-band light curves covering a total of
towards the southern TESS CVZ and have systematically
searched these sources for variability. We have identified
variables, including new discoveries. The light curves and
characteristics of the variables are all available through the ASAS-SN variable
stars database (https://asas-sn.osu.edu/variables). We also introduce an online
resource to obtain pre-computed ASAS-SN V-band light curves
(https://asas-sn.osu.edu/photometry) starting with the light curves of the
million sources studied in this work. This effort will be extended
to provide ASAS-SN light curves for million sources over the entire
sky.Comment: 13 pages, 12 figures. Submitted to MNRA
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