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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"

28038 results found.

  1. GRB 090520C: Fermi GBM detection
  2. GRB 090520B: Fermi GBM detection
  3. GRB 090522 : Fermi GBM detection
  4. GRB 090524: Fermi GBM detection
  5. GRB 090518 - NOT upper limit
  6. GRB 090516A: Konus-Wind and Swift/BAT joint spectral analysis
  7. GRB 090513B: Fermi GBM detection
  8. GRB 090520: GROND upper limits
  9. GRB 090518: Fermi GBM detection
  10. GRB 090516C: Fermi GBM detection
  11. GRB 090516: Fermi GBM observation
  12. GRB 090516B: Fermi GBM detection
  13. GRB 090519B: Fermi GBM detection
  14. GRB 090519: Swift-XRT refined analysis
  15. GRB 090519: NOT refined analysis
  16. GRB 090519: GROND observation
  17. GRB 090519: Swift/UVOT Upper Limits
  18. GRB 090519, Swift-BAT refined analysis
  19. GRB 090519: Enhanced Swift-XRT position
  20. GRB 090519: NOT afterglow candidate
  21. GRB 090519: FARO Chante Perdrix Observatory optical observations
  22. GRB 090519: TAROT Calern observatory optical observations
  23. GRB 090519: Swift detection of a burst
  24. GRB 090511: Fermi GBM Detection
  25. GRB 090514: Fermi GBM detection
  26. GRB 090518: Swift/UVOT Upper Limits
  27. GRB 090516: Observations from Stardome Observatory
  28. GRB090518: GROND upper limits
  29. GRB 090518: P60 Observations
  30. GRB 090518, Swift-BAT refined analysis
  31. GRB 090518B: Fermi GBM detection
  32. GRB 090516, RIMOTS optical upper limits
  33. GRB090513: Fermi GBM detection
  34. GRB 090518: Swift-XRT refined analysis
  35. GRB 090518: Enhanced Swift-XRT position
  36. GRB 090518: Swift detection of a burst
  37. GRB 090515: Swift/BAT spectral lag results
  38. GRB 090516: Swift-BAT refined analysis
  39. GRB 090516: GROND OBSERVATIONS
  40. GRB 090516 - Zadko Telescope observations
  41. GRB 090516: NOT optical observations
  42. GRB 090516: Swift XRT refined analysis
  43. GRB 090516: Swift/UVOT Observations
  44. GRB 090516: Enhanced Swift-XRT position
  45. GRB 090516: Swift detection of a burst
  46. GRB 090515: VLA observations
  47. GRB 090515: Lick Upper Limits
  48. GRB 090515: ROVOR Upper Limit
  49. GRB 090515: MMT/MMIRS NIR Upper Limit
  50. GRB 090515: Swift/UVOT Observations
  51. GRB 090515: Swift-XRT refined analysis
  52. GRB 090515: Enhanced Swift-XRT position
  53. GRB 090509: Fermi GBM observation
  54. GRB 090515: Swift-BAT refined spectral analysis
  55. GRB 090515: Swift-BAT refined analysis
  56. GRB 090509 - Zadko Telescope observations
  57. GRB 090515: Gemini-N upper limit
  58. GRB 090515: WIYN NIR Upper Limit
  59. GRB 090515: PAIRITEL Upper Limits
  60. GRB 090515: Swift detection of a short burst
  61. GRB 090510, Radio limits
  62. GRB090510: VLT/FORS2 spectroscopic redshift
  63. GRB 090510: GROND observations
  64. GRB 090510: Swift/UVOT host galaxy candidates
  65. GRB 090510: Fermi-LAT follow-up analysis
  66. GRB 090509, further Swift-BAT refined analysis
  67. GRB 090510B: Fermi GBM detection
  68. GRB 090502: Fermi GBM detection
  69. AGILE detection of GRB 090510
  70. GRB 090510: UVOT refined analysis
  71. GRB 090510: Swift XRT refined analysis
  72. GRB 090510: Enhanced Swift-XRT position
  73. GRB 090510: NOT afterglow confirmation
  74. GRB 090510: Swift-BAT refined analysis
  75. GRB 090510: Fermi GBM detection
  76. GRB 090509: Swift-BAT refined analysis
  77. GRB 090509, SMARTS optical/IR afterglow observations
  78. GRB 090510: Swift/UVOT Detection of a Candidate Optical Afterglow
  79. GRB 090510: Swift detection of a short hard burst
  80. GRB 090509: GROND further analysis and redshift limit
  81. GRB 090509: REM NIR afterglow
  82. GRB 090509: GROND afterglow candidate
  83. GRB 090423: 250 GHz upper limit for a z=8.2 GRB with MAMBO-2 at the IRAM 30m
  84. GRB 080913: 250 GHz upper limit for a z=6.7 GRB with MAMBO-2 at the IRAM 30m
  85. GRB 090427: GROND observations
  86. GRB 090429A: ROVOR magnitude limit
  87. ICSP VLF observation of GRB090427 from two receivers
  88. ICSP VLF observation of GRB090424 from four receivers
  89. GRB 090428B: Suzaku WAM observation of the prompt emission
  90. GRB 090424, SMARTS optical/IR afterglow monitoring
  91. GRB 090429D: Fermi GBM detection
  92. GRB 090429C: Fermi GBM detection
  93. GRB 090429B: Swift/UVOT Upper Limits
  94. GRB 090429A: Swift/UVOT Upper Limits
  95. GRB 090429B: Gemini-N further nIR observations
  96. GRB 090429A: Swift-XRT refined analysis
  97. GRB 090429A: GROND upper limits
  98. GRB 090427C: Fermi GBM detection
  99. GRB 090427B: Fermi GBM detection
  100. GRB 090426C: Fermi GBM detection

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