Search for Gravitational-wave Signals Associated with Gamma-Ray Bursts during the Second Observing Run of Advanced LIGO and Advanced Virgo

We present the results of targeted searches for gravitational-wave transients associated with gamma-ray bursts during the second observing run of Advanced LIGO and Advanced Virgo, which took place from 2016 November to 2017 August. We have analyzed 98 gamma-ray bursts using an unmodeled search method that searches for generic transient gravitational waves and 42 with a modeled search method that targets compact-binary mergers as progenitors of short gamma-ray bursts. Both methods clearly detect the previously reported binary merger signal GW170817, with p-values of <9.38 × 10−6 (modeled) and 3.1 × 10−4 (unmodeled). We do not find any significant evidence for gravitational-wave signals associated with the other gamma-ray bursts analyzed, and therefore we report lower bounds on the distance to each of these, assuming various source types and signal morphologies. Using our final modeled search results, short gamma-ray burst observations, and assuming binary neutron star progenitors, we place bounds on the rate of short gamma-ray bursts as a function of redshift for z ≤ 1. We estimate 0.07─1.80 joint detections with Fermi-GBM per year for the 2019─20 LIGO-Virgo observing run and 0.15─3.90 per year when current gravitational-wave detectors are operating at their design sensitivities

A Study on the Economics of Tobacco in Nepal

This study is based both on secondary and primary data. The primary data were collected using a smoking behavior survey and a purposive sample survey among tobacco-cultivating farmers. The overall smoking prevalence in Nepal for the population aged 15 or more is estimated at 37.4%, and is higher (47.4%) among males than among females (27.6%). Poor people are more likely to consume tobacco than their better-off counterparts, resulting in increased health hazards and the diversion of scarce income. The tobacco industry is a lucrative business for the private sector and government; the private sector makes large profits, and the tax revenue is substantial. Economic analysis estimated the price elasticity of demand for cigarettes and bidi at -0.882. It is found also that the poor and the young are the groups most sensitive to price changes. Therefore, considering health and economic benefits and poverty alleviation goals, a policy of real price increase through taxation of all types of tobacco product would be a desirable public policy for the government of Nepal to consider

Drug Act 1978 of Nepal: A Critical Analysis

Background: With the enactment of the Drug Act in 1978, through the establishment of different bodies under the act, drug-related activities have been regulated and controlled in Nepal so as to provide safe and efficacious drugs of standard quality to the general public.  However, with the overgrowing use of drugs, cosmetics, biotechnological products, nutraceuticals, and veterinary products in the present market and the present act failing to include these aspects, this paper tries to critically analyze the Drug Act 1978 of Nepal which will comprise strengths, weaknesses, opportunities, and threats faced in current scenario regarding the act. The regulation of drugs in Nepal was started with the enactment of the Drugs Act in 1978 AD, which is being carried out by the Department of Drug Administration as provisioned in the section 5 of the act. To facilitate the proper implementation of the act, various rules, regulations and guidelines are framed. The objective of this study was to explore the areas to improve in the Drugs Act and help foster the use of safe, efficacious and quality drugs. Method: The Drugs Act 1978 was critically analyzed focusing on the strengths, weaknesses, opportunities, and threats of the act as of current scenario. Result: After critically analyzing the drugs act 1978 we found out that there is lack in regulations of use of cosmetics, newer biotechnology products, nutraceuticals, veterinary product, innovative pharmaceutical products as well as the online pharmacy services. Conclusion: A major amendment and periodic revision is required with the consequence of meeting timely needs and promoting the idea of safety and efficacy in drug related activities

Search for intermediate mass black hole binaries in the first observing run of Advanced LIGO

International audienceDuring their first observational run, the two Advanced LIGO detectors attained an unprecedented sensitivity, resulting in the first direct detections of gravitational-wave signals produced by stellar-mass binary black hole systems. This paper reports on an all-sky search for gravitational waves (GWs) from merging intermediate mass black hole binaries (IMBHBs). The combined results from two independent search techniques were used in this study: the first employs a matched-filter algorithm that uses a bank of filters covering the GW signal parameter space, while the second is a generic search for GW transients (bursts). No GWs from IMBHBs were detected; therefore, we constrain the rate of several classes of IMBHB mergers. The most stringent limit is obtained for black holes of individual mass 100  M⊙, with spins aligned with the binary orbital angular momentum. For such systems, the merger rate is constrained to be less than 0.93  Gpc−3 yr−1 in comoving units at the 90% confidence level, an improvement of nearly 2 orders of magnitude over previous upper limits

First low-frequency Einstein@Home all-sky search for continuous gravitational waves in Advanced LIGO data

International audienceWe report results of a deep all-sky search for periodic gravitational waves from isolated neutron stars in data from the first Advanced LIGO observing run. This search investigates the low frequency range of Advanced LIGO data, between 20 and 100 Hz, much of which was not explored in initial LIGO. The search was made possible by the computing power provided by the volunteers of the Einstein@Home project. We find no significant signal candidate and set the most stringent upper limits to date on the amplitude of gravitational wave signals from the target population, corresponding to a sensitivity depth of 48.7  [1/Hz]. At the frequency of best strain sensitivity, near 100 Hz, we set 90% confidence upper limits of 1.8×10-25. At the low end of our frequency range, 20 Hz, we achieve upper limits of 3.9×10-24. At 55 Hz we can exclude sources with ellipticities greater than 10-5 within 100 pc of Earth with fiducial value of the principal moment of inertia of 1038  kg m2

First narrow-band search for continuous gravitational waves from known pulsars in advanced detector data

International audienceSpinning neutron stars asymmetric with respect to their rotation axis are potential sources of continuous gravitational waves for ground-based interferometric detectors. In the case of known pulsars a fully coherent search, based on matched filtering, which uses the position and rotational parameters obtained from electromagnetic observations, can be carried out. Matched filtering maximizes the signal-to-noise (SNR) ratio, but a large sensitivity loss is expected in case of even a very small mismatch between the assumed and the true signal parameters. For this reason, narrow-band analysis methods have been developed, allowing a fully coherent search for gravitational waves from known pulsars over a fraction of a hertz and several spin-down values. In this paper we describe a narrow-band search of 11 pulsars using data from Advanced LIGO’s first observing run. Although we have found several initial outliers, further studies show no significant evidence for the presence of a gravitational wave signal. Finally, we have placed upper limits on the signal strain amplitude lower than the spin-down limit for 5 of the 11 targets over the bands searched; in the case of J1813-1749 the spin-down limit has been beaten for the first time. For an additional 3 targets, the median upper limit across the search bands is below the spin-down limit. This is the most sensitive narrow-band search for continuous gravitational waves carried out so far