Skip to main content
New! BOOM Notices and Schema v7.0.0. 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.

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"

858 results found.

  1. Konus-Wind observation of GRB 160102A
  2. Konus-Wind observation of GRB 160107A
  3. GRB 160107A: CALET Gamma-Ray Burst Monitor detection
  4. GRB 160107A: Fermi GBM observation
  5. GRB 160107A: MAXI/GSC detection
  6. Konus-Wind observation of GRB 160101A
  7. GRB 160104B: MAXI/GSC detection
  8. GRB 160102A: Swift-XRT observations
  9. GRB 160102A: Tiled Swift observations
  10. GRB 160102A: MAXI/GSC detection
  11. GRB 160101A: Swift/UVOT Detection
  12. GRB 160101A: Fermi GBM observation
  13. GRB 160101A: Swift-XRT afterglow detection
  14. GRB 160101A: Tiled Swift observations
  15. GRB 160101A: MAXI/GSC detection
  16. LIGO/Virgo G211117: MAXI/GSC observations
  17. GRB 151212A iTelescope observation
  18. GRB 151216A: MAXI/GSC detection
  19. GRB151212A: Swift/UVOT observations
  20. GRB 151212A: GROND Optical Afterglow Candidate
  21. GRB 151212A: Swift-XRT afterglow detection
  22. GRB 151212A: Tiled Swift observations
  23. GRB 151212A: MAXI/GSC detection
  24. GRB 151205C: Optical follow-up observations at Kiso
  25. GRB 151205C: Swift-XRT observations
  26. GRB 151205C: Tiled Swift observations
  27. GRB 151205C: MAXI/GSC detection
  28. GRB 151112A: MAXI/GSC detection
  29. LIGO/Virgo G194575: MAXI/GSC further analysis
  30. GRB 151027A: MAXI/GSC detection
  31. LIGO/Virgo G194575: MAXI/GSC observations
  32. GRB 150907A: Swift-XRT afterglow detection
  33. GRB150907A: Swift/UVOT observations
  34. GRB 150907A: Swift-XRT observations
  35. GRB 150907A: Tiled Swift observations
  36. GRB 150907A: MAXI/GSC detection
  37. GRB 150801A: Swift-XRT observations
  38. GRB 150801A: Tiled Swift observations
  39. GRB 150801A: MAXI/GSC detection
  40. Konus-Wind observation of GRB 150725A
  41. GRB 150725A: MAXI/GSC detection
  42. GRB 150622A: Swift-XRT afterglow detection
  43. V404 Cyg activity (Swift, Fermi, INTGRAL, KONUS, MAXI detection): optical observations in TSHAO, Khureltogot, and AAO
  44. GRB 150622A: Swift-XRT observations
  45. GRB 150622A: Tiled Swift observations
  46. GRB 150622A: MAXI/GSC detection
  47. GRB 150608A: Swift-XRT follow-up observations
  48. Konus-Wind observation of GRB 150608A
  49. GRB 150608A: Swift-XRT afterglow detection
  50. GRB 150608A: Tiled Swift observations
  51. GRB 150608A: MAXI/GSC detection
  52. GRB 150518A: possible SN observations
  53. GRB 150518A: MAXI-GSC further analysis
  54. GRB 150518A: Mondy optical observations
  55. GRB 150518A: AMI 15 GHz detection of possible radio counterpart
  56. GRB 150518A: MASTER-net before, early and after optical stereoscopic observations with possible MP discovery inside MAXI error box
  57. Konus-Wind observation of GRB 150518A
  58. GRB 150518A: Swift-XRT follow-up observations
  59. GRB 150518A: Correction
  60. GRB 150518A: VLT/X-shooter redshift of the likely host galaxy
  61. Swift/UVOT observations of GRB150518A
  62. GRB 150518A: Swift-XRT afterglow detection
  63. GRB 150518A: Tiled Swift observations
  64. GRB 150518A: MAXI/GSC detection
  65. Konus-Wind observation of GRB 150430A
  66. GRB 150430A: Fermi GBM Detection
  67. GRB 150430A: MAXI/GSC detection
  68. GRB 150428C: Swift-XRT observations
  69. GRB 150428C: Tiled Swift observations
  70. GRB 150428C/MAXI J0400+678: MAXI/GSC detection
  71. GRB 150424B: Fermi GBM detection
  72. GRB 150424B: Tiled Swift observations
  73. GRB 150424B: MAXI/GSC detection
  74. Konus-Wind observation of GRB 150418A
  75. GRB150418A: Swift/UVOT did not detect a new source
  76. GRB 150418A: Swift-XRT observations
  77. GRB 150418A: Tiled Swift observations
  78. GRB 150418A: MAXI/GSC detection
  79. GRB 150413A: MAXI/GSC detection
  80. GRB 150313A: MAXI/GSC detection
  81. GRB 150311A: Konus-Wind trigger at 16:16:24 is not a GRB
  82. GRB 150311A: MAXI/GSC possible afterglow detection
  83. GRB 150222B: MAXI/GSC detection
  84. Konus-Wind observation of GRB 150206A
  85. Trigger 630047: Swift detection of 1RXS J180408.9-342058
  86. GRB 150206A: MAXI/GSC detection
  87. GRB 150123A: MASTER inspection
  88. Konus-Wind observation of GRB 150126A reveals its ultra-long nature
  89. GRB 150126A: Fermi GBM Detection
  90. GRB 150126A: MAXI/GSC afterglow candidate detection
  91. Konus-Wind observation of GRB 150123A
  92. GRB 150123A: Swift/UVOT observations
  93. GRB 150123A: Swift-XRT observations
  94. GRB 150123A Tiled Swift observations
  95. GRB 150123A: MAXI/GSC detection
  96. The Swift Detection of a Large Flare from the RS CVn Binary SZ Psc
  97. GRB 150110C: Swift/UVOT Upper Limits
  98. GRB 150110C: Swift-XRT observations
  99. GRB 150110A: MASTER inspection
  100. GRB 150110C Tiled Swift observations

Advanced

Download all Circulars as a .tar.gz archive:
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