1. Current Position

Professor (Adiyaman University, Turkey)

Research Professor (The George Washinton University)

2. Research Areas

Study of Gamma Ray Bursts, X-Ray Binaries, Supernova Remnants, IMBHs, Optical Polarization Measurements for CVs and Symbiotics, ULXs, Exoplanets.

3. Education

BSc : 1997 - 2002 (Physics, University of Cukurova, Turkey)

MSc : 2002 - 2005 (Physics, University of Cukurova, Turkey)

PhD : 2005 - 2009 (Physics, University of Cukurova, Turkey & Special Astrophysical Observa- tory, Russia)

Post-Doc : July, 2010 - October, 2011 (NASA-Goddard)

Researcher : July, 2012 - Sept., 2012 (NASA-Goddard )

Researcher : July, 2013 - October, 2013 (NASA-Goddard)

Researcher : July, 2014 - October, 2014 (The George Washington University, Washington, DC)

Researcher : April, 2015 - August, 2015 (The George Washington University, Washington, DC)

Researcher : August, 2016 - November, 2016 (The George Washington University, Washington, DC)

4. Awards and Research Activities

5. Recent Projects

IMBHs in Nearby Dwarf Galaxies, XMM-AO-15 (Researcher, PI: K. S. Dhuga)

VLA/13A-411 Probing the composition of GRB jets with JVLA: a quest for reverse shocks (Researcher, PI:A. Corsi)

VLA/13A-508 Late-time follow-up of GRB 130215A with the VLA (Researcher, PI:A. Corsi)

VLA/14A-430 Probing the composition of GRB jets with VLA: a quest for reverse shocks 
(Researcher, PI:A. Corsi)

VLA/15A-333 A VLA quest for GRB reverse shocks (Researcher, PI:A. Corsi)

6. Mentorship

• 
Graduate Student: Furkan Dolek (2013-2015: MSc, Co-supervisor)
• Graduate Student: Utkan Temiz (2013-2015: MSc, Co-supervisor)
• Graduate Student: Dilem Goktas (2019-2020: MSc, Co-supervisor)
• Graduate Student: Pakize Aydin (2019-2020: MSc, Co-supervisor)
• Graduate Student: Ismail Tunca Amanvermez (2017-2020: MSc, Co-supervisor)
• Graduate Student: Aslı Tuncer (2018-2021: MSc, Co-supervisor)
• Graduate Student: Ali Mutlu (2015-2020: MSc, Supervisor)
• Graduate Student: Yakup Genc (2019-2023: MSc, Supervisor)

7. List of Publications

Refereed Journal Articles

• Optical counterparts of two candidate ultraluminous X-ray sources in NGC 4536, Avdan, H., Sonbas, E. et al. MNRAS, 521, 5298 (2023)
• Catching profound optical flares in blazars, Bhatta, G. et al. MNRAS, 520, 2633 (2023)
• GRB 221009A: Discovery of an Exceptionally Rare Nearby and Energetic Gamma-Ray Burst, Williams, Maia A. et al. ApJ, 946L, 24W(2023)
• Optical counterparts of ULXs in NGC 1672, Allak, S.; Akyuz, A.; Sonbas, E. ; Dhuga, K. S., MNRAS, 515, 3632 (2022)
• Host galaxy magnitude of OJ 287 from its colours at minimum light, Valtonen, M. et al., MNRAS, 514, 3017 (2022)
• Apophis Planetary Defense Campaign, Reddy, V. et al. The Planetary Science Journal,3, 5, 123 (2022)
• Refinement of the convex shape model and tumbling spin state of (99942) Apophis using the 2020-2021 apparition data, Lee, H. -J. et al. A\&A, 661, 14 (2022)
• A Temporal Scale to Track the Spectral Transitions in Low-Mass X-ray Binaries, Sonbas, E.; Mohamed, K.; Dhuga, K.; Gogus, E. MNRAS, 511, 2535 (2022)
• The transient ultraluminous X-ray source, ULX-4, in M51, Allak, S. et al. MNRAS, 510, 4355 (2022)
• Probing Transit Timing Variations of Three Hot-Jupiters: HATP-36b, HATP-56b, and WASP-52b, Sonbas, E. et al. MNRAS, 509, 5102 (2022)
• Recurrent strong outbursts of an EXor-like young eruptive star Gaia20eae, Cruz-Sáenz de Miera, F. et al. ApJ, 927, 125 (2022)
• Properties of slowly rotating asteroids from the convex Inversion Thermophysical Model, Marciniak, A. et al. A&A, 654, 87 (2021)
• GRB 140102A: insight into prompt spectral evolution and early optical afterglow emission, Gupta, R. et al. MNRAS, 505, Issue 3, pp.4086-4105 (2021)
• A minimal time-scale for the continuum in 4U 1608-52 and Aql X-1, Mohamed, K.; Sonbas, E.; Dhuga, K.; Gogus, E.; Tuncer, A. et al. MNRAS 502L, 72 (2021)
• The 2017 May 20 stellar occultation by the elongated centaur (95626) 2002 GZ32, Santoz-Sanz, P. et al. MNRAS, 501, 6062 (2021)
• A minimal time-scale for the spectral states of GX 339-4, Sonbas, E.; Mohamed, K.; Dhuga, K.; Tuncer, A.; Gogus, E. MNRAS, 499, 2513 (2020) 
• ASAS census of twins, Bakıș, V.;Eker, Z.; Sarı, O.; Yücel, G.;Sonbaș, E. MNRAS, 496, 2065 (2020)
• Spitzer Observations of the Predicted Eddington Flare from Blazar OJ287, Laine, S et al., ApJ, 894, 1 (2020) 
• A multi-wavelength analysis of a collection of short-duration GRBs observed between 2012- 2015 Pandey, S. B. et al., MNRAS, 485, 529 (2019)
• A Decade of Gamma-Ray Bursts Observed by Fermi-LAT: The Second GRB Catalog Ajello, M. et al. ApJ, 878, 52 (2019)
• Thermal properties of slowly rotating asteroids: results from a targeted survey Marciniak, A. et al. A&A...625, 139 (2019)
• Evidence of an X-Ray-Ultraviolet Spectral Correlation in Ultraluminous X-Ray Sources Sonbas, E.; Dhuga K.S.; Gogus E. ,ApJL, 873, 12 (2019)
• The Bright X-Ray Source in NGC 3413 Sonbas, E.; Dhuga K.S.; Gogus E. ,ApJ, 865, 158 (2018)
• Authenticating the Presence of a Relativistic Massive Black Hole Binary in OJ 287 Using its General Relativity Centenary Flare: Improved Orbital Parameters Lankeswar Dey et al. ApJ, 866, 11 (2018)
• Stochastic Modeling of Multiwavelength Variability of the Classical BL Lac Object OJ 287 on Timescales Ranging from Decades to Hours Goyal, A. et al. The Astrophysical Journal, Volume 863, Issue 2, article id. 175, 20 pp. (2018)
• A Study of Low-Mass X-Ray Binaries in the Low-Luminosity Regime Sonbas, E.; Dhuga K.S.; Gogus E. Accepted for publication in ApJ
• Polarization and Spectral Energy Distribution in OJ 287 during the 2016/17 Outbursts Valtonen, M. et al., Galaxies, 5, 83 (2017)
• The size, shape, density and ring of the dwarf planet Haumea from a stellar occultation Ortiz, J. L. et al. Nature, Volume 550, Issue 7675, pp. 219-223 (2017)
• A Search for QPOs in the Blazar OJ287: Preliminary Results from the 2015/2016 Observing Campaign Zola, S. et al. Galaxies, vol. 4, issue 4, p. 41 (2016)
• X-ray Sources in the Dwarf Spheroidal Galaxy Draco
Sonbas, E.; Rangelov, B.; Kargaltsev, O.; Dhuga, K. S.; Hare, J. , Volkov, I. The Astrophysical Journal, Volume 821, Issue 1, article id. 54, 11 pp (2016)
• Primary Black Hold Spin in OJ 287 as Determined by the General Relativity Centenary Flare Valtonen, M. J. et al. The Astrophysical Journal Letters, Volume 819, Issue 2, article id. L37, 6 pp. (2016)
• Multi-wavelength study of HESS J1741-302
Hare, Jeremy; Rangelov, Blagoy; Sonbas, E.; Kargaltsev, Oleg, Volkov, I. The Astrophysical Journal, Volume 816, Issue 2, article id. 52, 8 pp. (2016)
• Gamma-Ray Bursts: Temporal Scales and the Bulk Lorentz Factor
Sonbas, E.; MacLachlan, G. A.; Dhuga, K. S.; Veres, P.; Shenoy, A.; Ukwatta, T. N. The Astrophysical Journal, Volume 805, Issue 2, article id. 86, 6 pp. (2015)
• 1FGL J0523.5-2529: A New Probable Gamma-Ray Pulsar Binary Strader, Jay; Chomiuk, Laura; Sonbas, E. et al.
The Astrophysical Journal Letters, Volume 788, L27, 5 pp. (2014)
• Fermi-LAT Observations of the Gamma-Ray Burst GRB 130427A Fermi LAT & GBM Team. Ackermann, M. et al.
Science, Volume 343, Issue 6166, pp. 42-47 (2014)
• The Afterglow of GRB 130427A from 1 to 1016 GHz
Perley, D. A.; Cenko, S. B.; Corsi, A.; Tanvir, N. R.; Levan, A. J.; Kann, D. A.; Sonbas, E. et al.
The Astrophysical Journal, Volume 781, Issue 1, article id. 37, 21 pp.(2014)
• The Hurst exponent of Fermi gamma-ray bursts
MacLachlan, G. A.; Shenoy, A.; Sonbas, E.; Coyne, R.; Dhuga, K. S.; Eskandarian, A.; Maximon, L. C.; Parke, W. C.
Monthly Notices of the Royal Astronomical Society, Volume 436, Issue 4, p.2907-2914 (2013)
• The First Fermi-LAT Gamma-Ray Burst Catalog
Fermi LAT Team. Ackermann, M. et al.
The Astrophysical Journal Supplement, Volume 209, Issue 1, article id. 11, 90 pp. (2013)
• Probing Curvature Effects in the Fermi GRB 110920
Shenoy, A.; Sonbas, E.; Dermer, C.; Maximon, L. C.; Dhuga, K. S.; Bhat, P. N.; Hakkila, J.; Parke, W. C.; Maclachlan, G. A.; Eskandarian, Ali; Ukwatta, T. N.
The Astrophysical Journal, Volume 778, Issue 1, article id. 3, 7 pp.(2013)
• Minimum Variability Time Scales of Long and Short GRBs
MacLachlan, G. A.; Shenoy, A.; Sonbas, E.; Dhuga, K. S.; Cobb, B.; Ukwatta, T. N.; Morris, D. C.; Eskandarian, A.; Maximon, L. C.; Parke, W. C.
Monthly Notices of the Royal Astronomical Society, Volume 432, Issue 2, p.857-865 (2013)
• A New Correlation between GRB X-Ray Flares and the Prompt Emission
Sonbas, E.; MacLachlan, G. A.; Shenoy, A.; Dhuga, K. S.; Parke, W. C.
The Astrophysical Journal Letters, Volume 767, Issue 2, article id. L28, 5 pp. (2013)
• XMM-Newton Observations of Luminous Sources in the Nearby Galaxies: NGC 4395, NGC 4736, and NGC 4258
Akyuz, A.; Kayaci, S.; Avdan, H.; Ozel, M. E.; Sonbas, E.; Balman, S.,
Astronomical Journal, 145, 67 (2013)
• Multiwavelength Observations of GRB 110731A: GeV Emission From Onset to Afterglow Ackermann, M. et al. (Fermi&Swift Grup)
The Astrophysical Journal, 763:71 (19pp) (2013)
• The minimum variability time-scale and its relation to pulse profiles of Fermi GRBs MacLachlan, G. A.; Shenoy, A., Sonbas, E.; Dhuga, K. S.; Eskandarian, A.; Maximon, L. C; Parke, W. C.,
Monthly Notices of the Royal Astronomical Society: Letters, Volume 425, Issue 1, pp. L32- L35 (2012)
• Constraining the High-energy Emission from Gamma-Ray Bursts with Fermi The Fermi Large Area Telescope Team, M. Ackermann ve ark.
The Astrophysical Journal, Volume 754, Issue 2, article id. 121 (2012).
• Panchromatic Observations of the Textbook GRB 110205A: Constraining Physical Mecha- nisms of Prompt Emission and Afterglow
Zheng, W. et al. The Astrophysical Journal, Volume 751, Issue 2, article id. 90 (2012)
• The lag-luminosity relation in the GRB source frame: an investigation with Swift BAT bursts Ukwatta, T. N.; Dhuga, K. S.; Stamatikos, M.; Dermer, C. D.; Sakamoto, T.; Sonbas, E.; Parke, W. C.; Maximon, L. C.; Linnemann, J. T.; Bhat, P. N.; Eskandarian, A.; Gehrels, N.; Abeysekara, A. U.; Tollefson, K.; Norris, J. P. 
Monthly Notices of the Royal Astronomical Society, Volume 419, Issue 1, pp. 614-623 (2012)
• The unusual gamma-ray burst GRB 101225A from a helium star/neutron star merger at redshift 0.33 
Thone, C. C. et al.
Nature, Volume 480, Issue 7375, pp. 72-74 (2011)
• Detection of High-energy Gamma-Ray Emission During the X-Ray Flaring Activity in GRB 100728A 
Abdo et al. (FERMI - LAT Team)
The Astrophysical Journal Letters, Volume 734, Issue 2, article id. L27 (2011)
• A search for supernova remnants in the nearby spiral galaxy M 74 (NGC 628). Sonbas, E., Akyuz, A., Balman, S., Ozel, M.E.
Astronomy and Astrophysics, Volume 517, id.A91 (2010)
• Study of Envelope Velocity Evolution of Type Ib-c Core-Collapse Supernovae from Observa- tions of XRF 080109 / SN 2008D and GRB 060218 / SN 2006aj with BTA.
Moskvitin, A. S., Sonbas, E., Sokolov, V. V., Fatkhullin, T. A., Castro-Tirado, A. J. Astrophysical Bulletin, Vol. 65, Issue 2, p.132-139 (2010)
• An optical search for supernova remnants in the nearby spiral galaxy NGC 2903. Sonbas, E., Akyuz, A., Balman S.
Astronomy and Astrophysics, Volume 493, Issue 3, 2009, pp.1061-1065 (2009)
• Flares from a candidate Galactic magnetar suggest a missing link to dim isolated neutron stars. 
Castro-Tirado, A. J. et al.
Nature, Volume 455, Issue 7212, pp. 506-509 (2008)
• Stellar-wind envelope around the massive supernova progenitor XRF/GRB 060218/SN 2006aj Sonbas, E.; Moskvitin, A. S.; Fatkhullin, T. A.; Sokolov, V. V.; Castro-Tirado, A.; de Ugarte Postigo, A.; Gorosabel, G.; Guzij, S.; Jelinec, M.; Sokolova, T. N.; Chernenkov, V. N. Astrophysical Bulletin, Volume 63, Issue 3, pp.228-243 (2008)

Proceedings

• Emission Mechanisms in Quiescent X-ray Binaries, Sonbas E. et al. 2017, EWASS
• The 2017 January 21st multi-chord stellar occultation by the dwarf planet Haumea. Prelim- inary results. 
J. L. Ortiz and the The Haumea collaboration,
European Planetary Science Congress 2017, 1722 September 2017
• Searching Planets Around Eclipsing Close Binary Stars Using Timing Method-III, Nasiroglu et al. 2017, Turkish Physical Society, September 2017, Bodrum, Turkey
• X-Ray Sources in the Dwarf Spheroidal Galaxy DRACO Sonbas, E.; Dhuga, K.; Rangelov, B.; Kargaltsev, O. 
XMM-Newton: The Next Decade, Proceedings of the Conference held 9-11 May, 2016 at ESAC, Madrid.
• Temporal Variability and the Bulk Lorentz Factor of GRBs Sonbas, E.; MacLachlan, G.; Dhuga, K. S.; Veres, P.; Shenoy, A. Proceedings of Swift: 10 Years of Discovery (SWIFT 10)
• X - Ray Flares and Their Connection With Prompt Emission in GRBs Sonbas, E.; MacLachlan, G. A.; Shenoy, A.; Dhuga, K. S.; Parke, W. C. 
7th Huntsville Gamma-Ray Burst Symposium, GRB 2013: paper 15 in eConf Proceedings C1304143
• GRB Spectral Lags in The Source Frame: An Investigation of Fermi-GBM Bursts 
Sonbas, E.; Ukwatta,T.N.; Dhuga,K.S.; Shenoy,A.; MacLachlan,G.A.; Bhat,P.N.; Der- mer,C.; Hakkila,J.; Gehrels,N.; Parke,W.C.; Maximon,L.C. 
Proceedings of the Gamma-Ray Bursts 2012 Conference (GRB 2012). May 7-11, 2012. Mu- nich, Germany. Published online at http://pos.sissa.it/cgi-bin/reader/conf.cgi? confid=152, id.26
• Curvature Effects in GRBs 
A. Shenoy, Sonbas, E., et al. 2012 
Proceedings of the Gamma-Ray Bursts 2012 Conference (GRB 2012). May 7-11, 2012. Mu- nich, Germany. Published online at http://pos.sissa.it/cgi-bin/reader/conf.cgi? confid=152, id.48
• Variability Time Scales of GRBs 
MacLachlan,G.; Shenoy,A.; Sonbas, E.; Dhuga,K.S.; Parke,W.C.; Maximon,L.C.; Eskandar- ian,A. 
Proceedings of the Gamma-Ray Bursts 2012 Conference (GRB 2012). May 7-11, 2012. Mu- nich, Germany. Published online at http://pos.sissa.it/cgi-bin/reader/conf.cgi? confid=152, id.33
• SWIFT J195509+261406: Dramatic Flaring Activity from a New Galactic Magnetar 
de Ugarte Postigo, A. et al. 2010, Highlights of Spanish Astrophysics V, Astrophysics and Space Science Proceedings, Volume . ISBN 978-3-642-11249-2. Springer-Verlag Berlin Hei- delberg, p. 399
• GRB 070610: Flares from a peculiar Galactic source 
Postigo, A. De Ugarte et al. 2008, GAMMA-RAY BURSTS 2007: Proceedings of the Santa Fe Conference. AIP Conference Proceedings, Volume 1000, pp. 337-341
• Gamma-ray bursts and practical cosmology 
Moskvitin, A. S.; Sonbas, E.; Sokolov, I. V.; Fatkhullin, T. A. 2008 
Practical Cosmology, Proceedings of the International Conference ”Problems of Practical Cosmology”, held at Russian Geographical Society, 23-27 June, 2008 in St. Petersburg, Edited by Yurij V. Baryshev, Igor N. Taganov, Pekka Teerikorpi, Volume 1. TIN, St.-Petersburg, Vol.1,2, ISBN 978-5-902632, p.228-238
• An Optical Search for Supernova Remnants In NGC 3184 And NGC 2903 Sonbas, E.; Akyuz, A.; Balman, S.; Cekmecelioglu, E. 2007
AIP Conference Proceedings, Volume 899, pp. 135-136
• Optical Search for Supernova Remnants in Two Spiral Galaxies
Akyuz, A.; Balman, S.; Bhattacharya, D.; Sonbas, E.; Cekmecelioglu, E. 2006 
Proceedings of the The X-ray Universe 2005 (ESA SP-604). 26-30 September 2005, El Esco- rial, Madrid, Spain. Editor: A. Wilson, p.441

Circulars

 

• For the full list of GCNs, Atels, CBETs link