scholarly journals AUTOMATING THE ALERT RESPONSE OF THE NU TRANSIENT TELESCOPE AT ASSY-TURGEN ASTROPHYSICAL OBSERVATORY (NUTTELA-TAO)

2021 ◽  
Vol 53 ◽  
pp. 169-173
Author(s):  
Z. Maksut ◽  
B. Grossan
Keyword(s):  
Gamma Ray ◽  
Optical Emission ◽  
Physical Nature ◽  
High Time Resolution ◽  
Automated Control ◽  
Optical Telescope ◽  
Resolution Imaging ◽  
Socket Connection ◽  
Performance Results ◽  
Actuation Systems

Our project aims to identify the physical nature of gamma-ray burst (GRB) emission via measurement of the optical spectral shape of this emission during the prompt phase, usually lasting only 60 sec. These measurements require a fast-moving optical telescope and instrumentation to respond autonomously to real-time GRB alerts. The Nazarbayev University Transient Telescope at AssyTurgen Astrophysical Observatory (NUTTelA-TAO) has a 0.7 m aperture, and can point anywhere above the local horizon in 8 seconds. We receive GRB Alerts via internet socket connection to the Gamma Coordinates Network (GCN) at the telescope site. We measure the GRB prompt optical emission with the Burst Simultaneous Three-Channel Imager (BSTI), which incorporates 3 EMCCD cameras, at Sloan g', r', and i' bands, for simultaneous high time-resolution imaging as fast as a few hundred millisecond per frame. We describe our automated control system software, including the overall control algorithm, control of the telescope, control and actuation systems for the enclosure roof, control of the instrument, and inputs from weather and other sensors. The software system is based on the GNU data language (GDL) in a Linux environment, selected for ease of writing and de-bugging software, familiarity to the project scientists, and image analysis capabilities. We give system performance results obtained during the early commissioning period.

scholarly journals THE GRB PROMPT OPTICAL EMISSION FEATURES ON THE EXAMPLE OF GRB160625B

2021 ◽  
Vol 53 ◽  
pp. 108-112
Author(s):  
V. V. Topolev ◽  
V. M. Lipunov
Keyword(s):  
Neutron Star ◽  
Stellar Wind ◽  
Gamma Ray ◽  
Optical Emission ◽  
Global Network ◽  
Model Parameters ◽  
High Time Resolution ◽  
Optical Light Curve ◽  
Helium Star ◽  
Quasiperiodic Oscillations

This article discusses a model for the occurrence of quasiperiodic oscillations in the optical light curve of a gamma-ray burst(GRB). The model is based on the assumption that GRB occurs in a binary system with strong stellar wind. Progenitor is a small core of helium star which emits a strong stellar wind that perturbs by the compact companion (neutron star).There is a calculation of model parameters by using the GRB160625B as an example, for which the MASTER global network received an optical curve with high time resolution.

scholarly journals Follow the BAT: Monitoring Swift BAT FoV for Prompt Optical Emission from Gamma-ray Bursts

2011 ◽  
Author(s):  
T. N. Ukwatta ◽  
J. Linnemann ◽  
K. S. Dhuga ◽  
N. Gehrels ◽  
J. E. McEnery ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Optical Emission ◽  
Gamma Ray Bursts

Search for Gamma Ray Burst Quasi Simultaneous Optical Emission with BOOTES-1

2001 ◽  
pp. 37-40
Author(s):  
J. M. Castro Cerón ◽  
A. J. Castro-Tirado ◽  
J. Soldán ◽  
R. Hudec ◽  
M. Bernas ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Optical Emission ◽  
Gamma Ray Burst

scholarly journals Millimeter and Microwave Activity of the Sun

1990 ◽  
Vol 142 ◽  
pp. 457-465 ◽  
Author(s):  
M. R. Kundu ◽  
S. M. White
Keyword(s):  
Magnetic Field ◽  
Gamma Rays ◽  
Solar Flares ◽  
Gamma Ray ◽  
High Spatial Resolution ◽  
High Resolution Imaging ◽  
The Sun ◽  
Millimeter Wavelengths ◽  
Resolution Imaging ◽  
The Magnetic Field

The emission of solar flares at millimeter wavelengths is of great interest both in its own right and because it is generated by the energetic electrons which also emit gamma rays. Since high-resolution imaging at gamma-ray energies is not presently possible, millimeter observations can act as a substitute. Except for that class of flares known as gamma-ray flares the millimetric emission is optically thin. It can be used as a powerful diagnostic of the energy distribution of electrons in solar flares and its evolution, and of the magnetic field. We have carried out high-spatial-resolution millimeter observations of solar flares this year using the Berkeley-Illinois-Maryland Array (BIMA), and report on the preliminary results in this paper (Kundu et al 1990; White et al 1990). We also report some recent results obtained from multifrequency observations using the VLA (White et al 1990).

scholarly journals Commission No. 9: Instruments and Techniques (Instruments et Techniques)

1988 ◽  
Vol 20 (2) ◽  
pp. 135-149
Author(s):  
C.M. Humphries ◽  
J. Davis
Keyword(s):  
Gamma Ray ◽  
High Angular Resolution ◽  
X Ray ◽  
Stellar Photometry ◽  
Business Meetings ◽  
Array Detectors ◽  
Future Space ◽  
Space Programs ◽  
Resolution Imaging ◽  
Instruments And Techniques

Given here are reports on the scientific and business meetings held in Baltimore involving Commission 9 only. Reports on the following Joint Commission Meetings co-sponsored by Commission 9 (JCM 3 and JCM 6), and on three additional meetings organised jointly with other Commissions, will be found elsewhere in this Volume or in Highlights of Astronomy (Volume 8):-High Angular Resolution Imaging from the Ground (JCM 3)-Stellar Photometry with Array Detectors (JCM 6)-Problems of IR Extinction and Standardization (with Commission 25)-Future Space Programs (with Commission 44)-Gamma-ray, X-ray, Extreme and Far UV, IR and Radio Astronomy from Space (with Commissions 40 and 44)

scholarly journals Prolonged sub-luminous state of the new transitional pulsar candidate CXOU J110926.4−650224

2019 ◽  
Vol 622 ◽  
pp. A211 ◽  
Author(s):  
Francesco Coti Zelati ◽  
Alessandro Papitto ◽  
Domitilla de Martino ◽  
David A. H. Buckley ◽  
Alida Odendaal ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Broad Band ◽  
Optical Emission ◽  
Bimodal Distribution ◽  
X Ray ◽  
The Past ◽  
Upper Limits ◽  
Photon Index ◽  
Multi Wavelength ◽  
Absorbed Power

We report on a multi-wavelength study of the unclassified X-ray source CXOU J110926.4−650224 (J1109). We identified the optical counterpart as a blue star with a magnitude of ∼20.1 (3300–10500 Å). The optical emission was variable on timescales from hundreds to thousands of seconds. The spectrum showed prominent emission lines with variable profiles at different epochs. Simultaneous XMM-Newton and NuSTAR observations revealed a bimodal distribution of the X-ray count rates on timescales as short as tens of seconds, as well as sporadic flaring activity. The average broad-band (0.3–79 keV) spectrum was adequately described by an absorbed power law model with photon index of Γ = 1.63  ±  0.01 (at 1σ c.l.), and the X-ray luminosity was (2.16  ±  0.04)  ×  1034 erg s−1 for a distance of 4 kpc. Based on observations with different instruments, the X-ray luminosity has remained relatively steady over the past ∼15 years. J1109 is spatially associated with the gamma-ray source FL8Y J1109.8−6500, which was detected with Fermi at an average luminosity of (1.5  ±  0.2)  ×  1034 erg s−1 (assuming the distance of J1109) over the 0.1–300 GeV energy band between 2008 and 2016. The source was undetected during ATCA radio observations that were simultaneous with NuSTAR, down to a 3σ flux upper limit of 18 μJy beam−1 (at 7.25 GHz). We show that the phenomenological properties of J1109 point to a binary transitional pulsar candidate currently in a sub-luminous accretion disk state, and that the upper limits derived for the radio emission are consistent with the expected radio luminosity for accreting neutron stars at similar X-ray luminosities.

scholarly journals Multiwavelength observations of PSR J2032+4127 during the 2017 periastron passage

2020 ◽  
Vol 495 (1) ◽  
pp. 365-374 ◽  
Author(s):  
M Chernyakova ◽  
D Malyshev ◽  
P Blay ◽  
B van Soelen ◽  
S Tsygankov
Keyword(s):  
Gamma Ray ◽  
Broad Band ◽  
Joint Analysis ◽  
Spectral Evolution ◽  
Optical Telescope ◽  
X Ray ◽  
Broad Band Emission ◽  
Band Emission ◽  
Mass Outflow ◽  
Be Star

ABSTRACT PSR J2032+4127 is only the second known gamma-ray binary where it is confirmed that a young radio pulsar is in orbit around a Be-star. The interaction of the pulsar wind with the mass outflow from the companion leads to broad-band emission from radio up to TeV energies. In this paper we present results of optical monitoring of the 2017 periastron passage with the Nordic Optical Telescope. These observations are complemented by X-ray (Swift/XRT, NuSTAR) and GeV (Fermi/LAT) monitoring. Joint analysis of the evolution of the parameters of the H α line and the broad-band (X-ray to TeV) spectral shape allows us to propose a model linking the observed emission to the interaction of the pulsar and Be-star winds under the assumption of the inclined disc geometry. Our model allows the observed flux and spectral evolution of the system to be explained in a self-consistent way.

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