Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

"200205A/SWIFT J0840.7-3516" does not adhere to advanced search syntax. Please refer to the documentation and try again.
Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

19596 results found.

  1. GRB 190926A: AbAO upper optical limit
  2. GRB 190926A: Swift-BAT refined analysis
  3. GRB 190926A: Swift/UVOT Upper Limits
  4. GRB 190926A: KAIT Optical Upper Limit
  5. GRB 190926A: Swift-XRT refined Analysis
  6. GRB 190926A: Enhanced Swift-XRT position
  7. Swift GRB190926.41: Global MASTER-Net observations report
  8. GRB 190926A: Swift detection of a burst
  9. LIGO/Virgo S190923y: no counterpart candidates in the Swift/BAT observations
  10. LIGO/Virgo S190924h: no counterpart candidates in the Swift/BAT observations
  11. GRB 190919B: Swift/UVOT Upper Limits
  12. GRB 190919B: Swift-XRT observations
  13. GRB 190919B: Swift ToO observations
  14. GRB 190828B: AstroSat CZTI detection
  15. LIGO/Virgo S190915ak: no counterpart candidates in the Swift/BAT observations
  16. LIGO/Virgo S190910h: no counterpart candidates in the Swift/BAT observations
  17. LIGO/Virgo S190910d: no counterpart candidates in the Swift/BAT Observations
  18. Swift Trigger 924641 is an outburst from MAXI J1807+132
  19. ZTF19abvizsw: No counterpart candidates from Swift/BAT targeted search
  20. GRB 190823A: Swift-XRT afterglow detection
  21. IPN triangulation of GRB 190906A (short)
  22. GRB190829A: Keck LRIS spectroscopic confirmation of the accompanying supernova
  23. Konus-Wind observation of GRB 190829A
  24. Swift XRT Detection of X-ray Emission from ZTF19abvizsw
  25. GRB 190829A: MASTER confirmation of GROND SN
  26. GRB 190829A: Flattening of optical light curve from continued Liverpool Telescope photometry
  27. LIGO/Virgo S190901ap: no counterpart candidates in the Swift/BAT Observations
  28. GRB 190829A: Continued fading inferred from Liverpool Telescope photometry
  29. GRB 190829A: Liverpool Telescope observations
  30. GRB 190829A: Liverpool Telescope optical photometry
  31. GRB 190829A: MMT detection of the optical afterglow
  32. GRB 190829A: No Neutrino Counterpart detected with ANTARES
  33. GRB 190829A: KAIT Detection of the Optical Afterglow
  34. GRB 190829A, Swift-BAT refined analysis
  35. GRB 190829A: AGILE-GRID upper limits
  36. GRB 190829A: AGILE ratemeters detection and MCAL upper limits
  37. GRB 190829A: Fermi GBM detection
  38. GRB 190829A: Fermi-LAT Upper Limits
  39. GRB 190829A:: Global MASTER-net optical clear and polarization observations scheduler and some spiculations
  40. GRB 190829A: Swift/UVOT detection of an optical afterglow with a rise
  41. GRB 190829A: GROND detection of the Optical/NIR Afterglow
  42. GRB 190829A: Swift-XRT refined Analysis
  43. GRB 190829A: Enhanced Swift-XRT position
  44. GRB 190829A: 10.4m GTC spectroscopy
  45. GRB 190829A: NOT optical afterglow detection and spectroscopy
  46. GRB 190829A:: MASTER-net bright and decay OT detection
  47. GRB 190829A: Swift detection of a burst consistent with a galaxy at z=0.08
  48. GRB 190828B: VLT/X-shooter optical afterglow candidate
  49. GRB 190828B: Swift-XRT refined Analysis
  50. LIGO/Virgo S190814bv: Swift observation of ASKAP J005547-270433/AT2019osy
  51. GRB 190828B: Swift/UVOT Upper Limits
  52. GRB 190828A: Swift-XRT observations
  53. GRB 190823A: AstroSat CZTI detection
  54. GRB 190828B: Fermi GBM observation
  55. GRB 190828B: Swift-BAT refined analysis
  56. LIGO/Virgo S190828l: no counterpart candidates in the Swift/BAT Observations
  57. LIGO/Virgo S190828j: no counterpart candidates in the Swift/BAT Observations
  58. GRB 190828A: Tiled Swift observations
  59. LIGO/Virgo S190814bv: Swift UVOT - no new counterpart candidates identified
  60. GRB 190828B: Enhanced Swift-XRT position
  61. Swift GRB190828.54 Global MASTER-Net observations report
  62. GRB 190828B: Swift detection of a burst
  63. GRB 190824A, Swift-BAT refined analysis
  64. GRB 190824A: Swift/UVOT Upper Limits
  65. GRB 190823A: Swift-XRT observations
  66. GRB 190816A: Swift-XRT afterglow detection
  67. GRB 190824A: Swift-XRT refined Analysis
  68. GRB 190824A: Fermi GBM observation
  69. GRB 190824A: Enhanced Swift-XRT position
  70. GRB 190821A: Swift-BAT refined analysis
  71. GRB 190824A: Swift detection of a burst
  72. GRB 190823A: Tiled Swift observations
  73. GRB 190821A: Swift/UVOT Upper Limits
  74. GRB 190821A: MASTER VWFC syncronous optical observations
  75. GRB 190821A: Swift-XRT refined Analysis
  76. GRB 190821A: Enhanced Swift-XRT position
  77. GRB 190821A: Fermi GBM observation
  78. Fermi GBM-190816: Upper Limits from Swift/BAT Observations
  79. GRB 190821A: MASTER do not see any afterglow candidate
  80. GRB 190821A: T60 Les Makes optical detection of the afterglow
  81. Swift GRB190821.72 Global MASTER-Net observations report
  82. GRB 190821A: Swift detection of a burst
  83. LIGO/Virgo GBM-190816: no counterpart candidates in the Swift/BAT Observations
  84. IceCube-190819A: MASTER analysis
  85. GRB 190816A: Swift-BAT refined analysis
  86. LIGO/Virgo S190814bv: No strong counterpart candidates in Swift/XRT observations
  87. GRB 190816A: Swift-XRT observations
  88. GRB 190816A: Swift detection of a burst
  89. LIGO/Virgo S190814bv: no counterpart candidates in Thacher imaging
  90. LIGO/Virgo S190814bv: No counterpart candidates in the Swift/BAT Observations
  91. IPN triangulation of GRB 190805B
  92. IPN triangulation of GRB 190810A (short)
  93. HAWC-190806A: Swift-XRT observations
  94. Correction to Swift GCN 25303
  95. Trigger_11505: Tiled Swift observations
  96. GRB 190805B: AstroSat CZTI detection
  97. GRB 190804B: Swift-XRT afterglow detection
  98. GRB 190805B: Swift-XRT observations
  99. GRB 190805B: Tiled Swift observations
  100. GRB 190804B: Swift-XRT observations

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov