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"

36784 results found.

  1. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  2. GRB 081215A: Gamma Repeater?
  3. GRB 0811215A: MASTER prompt optical observations
  4. GRB 081215A: Andromeda inside Fermi error box: MASTER observations
  5. GRB 0811215A: Andromeda inside Fermi error box: MASTER observations
  6. Possible GRB 081211B: Swift/UVOT Upper Limits
  7. GRB 081213: Fermi GBM detection
  8. GRB 081210: optical observations
  9. Possible GRB 081211B - Swift-XRT analysis
  10. GRB 081207: Fermi GBM detection
  11. GRB 081209: Fermi GBM detection
  12. Fermi Gamma-ray Burst Monitor trigger 250533995 is not a GRB
  13. GRB 081007: Detection of a Supernova
  14. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  15. GRB 081210: Xinglong TNT R band Upper Limits
  16. GRB 081210, SMARTS optical/IR observations
  17. GRB 081211: Swift-BAT refined analysis
  18. GRB 081211: Swift XRT refined analysis
  19. GRB 081211: Swift/UVOT detection of an optical afterglow
  20. GRB 081211: Enhanced Swift-XRT position
  21. GRB 081210: Swift/UVOT refined analysis
  22. GRB 081211: Swift detection of a burst
  23. GRB 081210: Swift-XRT refined analysis
  24. GRB081203B: optical observations
  25. GRB 081210: Enhanced Swift-XRT position
  26. GRB 081210: Swift-BAT refined analysis
  27. GRB 081210: Swift detection of a burst with optical afterglow
  28. Konus-Wind observation of GRB 081209
  29. IPN triangulation of short hard GRB 081209
  30. GRB 081203A: optical observations
  31. GRB 081206C: Fermi GBM detection
  32. Radio observation of GRB 081121 with ATCA
  33. Radio observation of GRB 081118 with ATCA
  34. GRB 081206B: Fermi GBM detection
  35. GRB 081206: Fermi GBM detection
  36. GRB 081128: afterglow observations
  37. GRB 081203B: Suzaku WAM observation of the prompt emission
  38. GRB 081203B: Additional Gemini imaging
  39. Radio observation of GRB 081109 with ATCA
  40. Radio observation of GRB 081104 with ATCA
  41. Radio observation of GRB 081029 with ATCA
  42. Radio observation of GRB 081008 with ATCA
  43. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  44. GRB 081203B: Gemini observations
  45. GRB 081128: optical observation in CrAO
  46. GRB081203A: Optical observations at Ishigaki
  47. GRB 081128: Optical afterglow observations
  48. GRB 081204: GROND Observations
  49. GRB081203B: optical observations
  50. Radio detection of GRB 081203B with the VLA
  51. GRB 081204: Magellan observations
  52. GRB081203A: Radio upper limit at 15 GHz
  53. GRB 081204B: Fermi GBM detection
  54. GRB 081204: Swift/UVOT Upper Limits
  55. GRB 081204: Swift XRT afterglow confirmation
  56. GRB081203A: MITSuME optical observation
  57. GRB 081203A: Optical observations of Xinglong TNT telescope
  58. GRB 081203A: Skynet/GORT Detections
  59. GRB 081204: Swift XRT afterglow candidate
  60. GRB081203A: optical observation
  61. GRB 081204 : a long GRB localized by INTEGRAL
  62. VLA Radio upper limit on GRB 081203A
  63. Swift-XRT observations of GRB 081203B
  64. Konus-Wind observation of GRB 081203A
  65. Konus-Wind observation of GRB 081203B
  66. GRB081203A: Swift-XRT refined analysis
  67. GRB 081203B: optical observations
  68. GRB 081203B: SDSS upper limits at the position of the optical afterglow
  69. Swift/UVOT detection of GRB081203B
  70. GRB 081203B: Swift-XRT candidate afterglow.
  71. GRB 081203A: optical observations
  72. Swift UVOT observations of GRB 081203A
  73. GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
  74. GRB081203A: Swift/UVOT grism redshift
  75. GRB 081203A: Burst detection from Swift-BAT slew data
  76. GRB 081203A: Swift-BAT refined analysis
  77. GRB 081203: Enhanced Swift-XRT position
  78. GRB 081130B: MASTER prompt optical observations
  79. GRB081203: optical observation
  80. GRB 081203: Swift detection of a burst with a bright optical counterpart
  81. GRB 081128: optical observation
  82. GRB 081130B: Fermi GBM detection
  83. GRB 081130: Fermi GBM detection
  84. GRB 081126: afterglow photometry
  85. GRB 081126: Fermi GBM detection
  86. Fermi Gamma-ray Burst Monitor trigger 249166723 reclassification
  87. VLA Radio upper limit on GRB 081126
  88. GRB 081129: Fermi GBM detection
  89. GRB 081130: MASTER VWF prompt optical observations Fermi GRB
  90. GRB 081128A: optical observations
  91. Trigger 335971: Swift possible detection of a burst
  92. GRB081128: Swift/UVOT Upper Limits
  93. SGR 1806-20: Fermi GBM detection.
  94. GRB 081122B: Fermi GBM Detection
  95. GRB 081128: Swift-XRT refined analysis
  96. GRB 081128: Liverpool Telescope afterglow confirmation
  97. GRB081128: optical observations
  98. GRB 081128: Swift-BAT refined analysis
  99. GRB 081128: Enhanced Swift-XRT position
  100. GRB 081128: Optical observation of xinglong TNT

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