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"

11105 results found.

  1. GRB 090831A: Suzaku WAM observation of the prompt emission
  2. GRB 090902B: Suzaku WAM observation of the prompt emission
  3. GRB 090829A: Suzaku WAM observation of the prompt emission
  4. GRB 090904B: Fermi GBM detection
  5. GRB 090902B: ROTSE-III Detection of Optical Afterglow
  6. GRB 090902B: Swift/UVOT refined analysis
  7. GRB090902B: Swift XRT refined analysis
  8. GRB 090902B: Faulkes Telescope North observations
  9. GRB 090902B: GROND NIR Afterglow Observations
  10. GRB 090902B: Gemini-N absorption redshift
  11. GRB 090902B: Fermi LAT and GBM refined analysis.
  12. GRB 090902B: Optical afterglow candidate
  13. GRB090902B: Swift/UVOT observations
  14. GRB 090902B: Swift/XRT Afterglow Candidate
  15. GRB 090902B: Fermi LAT detection
  16. GRB 090902B: Fermi GBM detection of a bright burst
  17. GRB 090902: Fermi GBM detection
  18. GRB 090831A: IPN Triangulation
  19. GRB 090829B: Fermi GBM Detection
  20. GRB 090831: MAXI GSC detection
  21. GRB 090831: Fermi GBM detection
  22. GRB090829: Fermi GBM Detection
  23. GRB 090826: Fermi GBM detection
  24. GRB 090828: Fermi GBM detection
  25. Fermi Gamma-ray Burst Monitor trigger 273123112 is not a GRB
  26. GRB 090817 - TLS Observations
  27. GRB 090820: detection of a strong burst by RT-2 on board CORONAS PHOTON
  28. GRB 090820B: Fermi GBM detection
  29. GRB 090820: MASTER-Net optical polarization observations
  30. GRB 090820: Fermi GBM Detection of a bright burst.
  31. GRB 090817: Fermi GBM observation
  32. GRB 090813: Suzaku WAM observation of the prompt emission
  33. GRB 090815B: Fermi GBM detection
  34. GRB 090815: Fermi GBM detection
  35. Fermi Gamma-ray Burst Monitor trigger 271934815 is not a GRB
  36. GRB 090814C: Fermi GBM detection
  37. GRB 090813: Fermi GBM observation
  38. Fermi Gamma-ray Burst Monitor trigger 271446248 is not a GRB
  39. Fermi Gamma-ray Burst Monitor trigger 271833016 is not a GRB
  40. GRB 090807B: Fermi GBM detection
  41. GRB 090621B: MAGIC telescope GeV observation
  42. GRB 090621A: MAGIC telescope GeV observation
  43. GRB 090809B: Fermi GBM detection
  44. Fermi Gamma-ray Burst Monitor trigger 271275771 is not a GRB
  45. GRB 090802B: Fermi GBM detection
  46. GRB 090802: Fermi GBM detection
  47. GRB 090717A: Suzaku WAM observation of the prompt emission
  48. GRB 090711: Fermi GBM detection
  49. Konus-Wind and Konus-RF observations of GRB 090719
  50. Konus-RF and Konus-Wind observations of GRB 090718B
  51. Fermi Gamma-ray Burst Monitor triggers 269935914 through 270021937 are not GRBs
  52. Konus-Wind observations of bright hard GRB 090720B
  53. IPN Triangulation of bright GRB 090720B
  54. GRB 090720: Gemini-North Imaging and Optical Afterglow
  55. GRB 090720B: Fermi GBM detection
  56. Swift XRT and UVOT refned analysis of GRB 090720
  57. GRB 090720 Source found in ground processing of Swift-BAT data
  58. GRB 090717B: Fermi GBM detection
  59. GRB 090717: Fermi GBM detection
  60. GRB 090719: Fermi GBM detection
  61. GRB 090718B: Fermi GBM detection
  62. GRB 090718: Fermi GBM detection
  63. GRB 090720: Fermi GBM detection
  64. GRB090713 optical limit by "Pi of the Sky"
  65. GRB 090712: Fermi GBM observation
  66. GRB 090713: Fermi GBM detection
  67. GRB 090709B: Fermi GBM detection
  68. GRB 090708 : Fermi GBM detection
  69. GRB 090626: Suzaku WAM observation of the prompt emission
  70. GRB 090704: Fermi GBM observation
  71. GRB 090706: Fermi GBM detection
  72. GRB 090703: Fermi GBM detection
  73. GRB 090701: Fermi GBM detection
  74. GRB 090630: Fermi GBM detection
  75. Konus-Wind observation of GRB 090626
  76. GRB 090626: IPN localization
  77. Fermi LAT observations of GRB 090626
  78. GRB 090625B: Fermi GBM observation
  79. GRB 090626: Fermi GBM detection
  80. GRB 090623: Suzaku WAM observation of the prompt emission
  81. GRB 090625: Fermi GBM detection
  82. GRB 090617: Suzaku WAM observation of the prompt emission
  83. GRB 090623: Fermi GBM detection
  84. GRB 090621B: Fermi GBM detection
  85. GRB 090621D: Fermi GBM detection
  86. GRB 090621C: Fermi GBM detection
  87. GRB 090621: Fermi GBM observation
  88. GRB 090620: Fermi GBM detecion
  89. GRB 090618: Fermi GBM observation
  90. GRB 090617: Fermi GBM detection
  91. GRB 090616: Fermi GBM detection
  92. GRB 090612: Fermi GBM detection
  93. GRB 090610C: Fermi GBM detection
  94. GRB 090610B: Fermi GBM detection
  95. GRB 090610: Fermi GBM detection
  96. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  97. GRB 090602: Suzaku WAM observation of the prompt emission
  98. RXTE Discovery of Pulsations from SGR 0418+5729
  99. GRB 090531B: Fermi GBM detection
  100. Discovery of a new soft gamma repeater source, SGR 0418+5729

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