scholarly journals Searching for Fermi GRB optical counterparts with the prototype Gravitational-wave Optical Transient Observer (GOTO)

2021 ◽  
Vol 507 (4) ◽  
pp. 5463-5476
Author(s):  
Y-L Mong ◽  
K Ackley ◽  
D K Galloway ◽  
M Dyer ◽  
R Cutter ◽  
...  
Keyword(s):  
Gravitational Wave ◽  
Gamma Ray ◽  
Rapid Identification ◽  
Large Field ◽  
Gamma Ray Burst ◽  
La Palma ◽  
Multiple Observations ◽  
Overall Performance ◽  
Optical Transient

ABSTRACT The typical detection rate of ∼1 gamma-ray burst (GRB) per day by the Fermi Gamma-ray Burst Monitor (GBM) provides a valuable opportunity to further our understanding of GRB physics. However, the large uncertainty of the Fermi localization typically prevents rapid identification of multiwavelength counterparts. We report the follow-up of 93 Fermi GRBs with the Gravitational-wave Optical Transient Observer (GOTO) prototype on La Palma. We selected 53 events (based on favourable observing conditions) for detailed analysis, and to demonstrate our strategy of searching for optical counterparts. We apply a filtering process consisting of both automated and manual steps to 60 085 candidates initially, rejecting all but 29, arising from 15 events. With ≈3 GRB afterglows expected to be detectable with GOTO from our sample, most of the candidates are unlikely to be related to the GRBs. Since we did not have multiple observations for those candidates, we cannot confidently confirm the association between the transients and the GRBs. Our results show that GOTO can effectively search for GRB optical counterparts thanks to its large field of view of ≈40 deg2 and its depth of ≈20 mag. We also detail several methods to improve our overall performance for future follow-up programmes of Fermi GRBs.

scholarly journals Searching for electromagnetic counterparts to gravitational-wave merger events with the prototype Gravitational-Wave Optical Transient Observer (GOTO-4)

2020 ◽  
Vol 497 (1) ◽  
pp. 726-738 ◽  
Author(s):  
B P Gompertz ◽  
R Cutter ◽  
D Steeghs ◽  
D K Galloway ◽  
J Lyman ◽  
...  
Keyword(s):  
Gravitational Wave ◽  
Gamma Ray ◽  
Source Region ◽  
Binary Neutron Star ◽  
La Palma ◽  
Binary Black Hole ◽  
Test Models ◽  
Localization Performance ◽  
Optical Transient

ABSTRACT We report the results of optical follow-up observations of 29 gravitational-wave (GW) triggers during the first half of the LIGO–Virgo Collaboration (LVC) O3 run with the Gravitational-wave Optical Transient Observer (GOTO) in its prototype 4-telescope configuration (GOTO-4). While no viable electromagnetic (EM) counterpart candidate was identified, we estimate our 3D (volumetric) coverage using test light curves of on- and off-axis gamma-ray bursts and kilonovae. In cases where the source region was observable immediately, GOTO-4 was able to respond to a GW alert in less than a minute. The average time of first observation was 8.79 h after receiving an alert (9.90 h after trigger). A mean of 732.3 square degrees were tiled per event, representing on average 45.3 per cent of the LVC probability map, or 70.3 per cent of the observable probability. This coverage will further improve as the facility scales up alongside the localization performance of the evolving GW detector network. Even in its 4-telescope prototype configuration, GOTO is capable of detecting AT2017gfo-like kilonovae beyond 200 Mpc in favourable observing conditions. We cannot currently place meaningful EM limits on the population of distant ($\hat{D}_L = 1.3$ Gpc) binary black hole mergers because our test models are too faint to recover at this distance. However, as GOTO is upgraded towards its full 32-telescope, 2 node (La Palma & Australia) configuration, it is expected to be sufficiently sensitive to cover the predicted O4 binary neutron star merger volume, and will be able to respond to both northern and southern triggers.

scholarly journals RIBOTS: An Automatic Telescope System for Gamma-Ray Burst Follow-Up Observations

2001 ◽  
Vol 183 ◽  
pp. 155-156
Author(s):  
Yuji Urata ◽  
Nobuyuki Kawai ◽  
Atsumasa Yoshida ◽  
Mitsuhiro Kohama ◽  
Tetsuya Kawabata ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Observation System ◽  
Alert System ◽  
Gamma Ray Burst ◽  
Fully Automatic ◽  
Optical Flashes ◽  
Optical Transient ◽  
Telescope System

AbstractWe are constructing a fully automatic observation system named RIBOTS (RIken-Bisei Optical Transient Seeker). We aim to detect optical flashes and early afterglows of Gamma-ray bursts (GRB) with RIBOTS. We are constructing RIBOTS with a small telescope because a quick pointing to the burst is essential for our purpose. RIBOTS is linked to the GRB alert system provided by the HETE-2 satellite.

Gamma-Ray Burst Follow Up Observations with BOOTES in 1998-2000

2003 ◽  
pp. 53-55
Author(s):  
J. M. Castro Cerón ◽  
A. J. Castro-Tirado ◽  
R. Hudec ◽  
J. Soldán ◽  
M. Bernas ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Burst

scholarly journals A comparison between short GRB afterglows and kilonova AT2017gfo: shedding light on kilonovae properties

2020 ◽  
Vol 493 (3) ◽  
pp. 3379-3397 ◽  
Author(s):  
A Rossi ◽  
G Stratta ◽  
E Maiorano ◽  
D Spighi ◽  
N Masetti ◽  
...  
Keyword(s):  
Gravitational Wave ◽  
Gamma Ray ◽  
Light Curves ◽  
Optical Counterpart ◽  
Wave Source ◽  
Gamma Ray Burst ◽  
Nir Light ◽  
First Time ◽  
Short Grbs

ABSTRACT Multimessenger astronomy received a great boost following the discovery of kilonova (KN) AT2017gfo, the optical counterpart of the gravitational wave source GW170817 associated with the short gamma-ray burst GRB 170817A. AT2017gfo was the first KN that could be extensively monitored in time using both photometry and spectroscopy. Previously, only few candidates have been observed against the glare of short GRB afterglows. In this work, we aim to search the fingerprints of AT2017gfo-like KN emissions in the optical/NIR light curves of 39 short GRBs with known redshift. For the first time, our results allow us to study separately the range of luminosity of the blue and red components of AT2017gfo-like kilonovae in short GRBs. In particular, the red component is similar in luminosity to AT2017gfo, while the blue KN can be more than 10 times brighter. Finally, we exclude a KN as luminous as AT2017gfo in GRBs 050509B and 061201.

Directions for Future X-Ray, Optical, and Radio Follow-up Observations of Gamma-Ray Burst Counterparts

1995 ◽  
Vol 452 (1) ◽  
Author(s):  
B. J. McNamara ◽  
T. E. Harrison ◽  
C. L. Williams
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Burst ◽  
X Ray

scholarly journals SHORT GAMMA-RAY BURST FORMATION RATE FROM BATSE DATA USINGEp-LpCORRELATION AND THE MINIMUM GRAVITATIONAL-WAVE EVENT RATE OF A COALESCING COMPACT BINARY

2014 ◽  
Vol 789 (1) ◽  
pp. 65 ◽  
Author(s):  
Daisuke Yonetoku ◽  
Takashi Nakamura ◽  
Tatsuya Sawano ◽  
Keitaro Takahashi ◽  
Asuka Toyanago
Keyword(s):  
Gravitational Wave ◽  
Gamma Ray ◽  
Event Rate ◽  
Formation Rate ◽  
Gamma Ray Burst ◽  
Compact Binary ◽  
Wave Event

scholarly journals Gravitational wave memory of gamma-ray burst jets

2004 ◽  
Vol 70 (10) ◽  
Author(s):  
Norichika Sago ◽  
Kunihito Ioka ◽  
Takashi Nakamura ◽  
Ryo Yamazaki
Keyword(s):  
Gravitational Wave ◽  
Gamma Ray ◽  
Gamma Ray Burst

scholarly journals Constraints on Short, Hard Gamma-Ray Burst Beaming Angles from Gravitational Wave Observations

2018 ◽  
Vol 858 (2) ◽  
pp. 79 ◽  
Author(s):  
D. Williams ◽  
J. A. Clark ◽  
A. R. Williamson ◽  
I. S. Heng
Keyword(s):  
Gravitational Wave ◽  
Gamma Ray ◽  
Gamma Ray Burst
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