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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"
  1. GRB 080310 - SDSS Pre-Burst Observations
  2. GRB080310 : Lulin optical observation
  3. GRB 080310: Enhanced Swift-XRT position
  4. GRB 080310: RRM optical photometry with the VLT
  5. GRB080310, detection of break in optical
  6. GRB 080310: VLT/UVES spectroscopy
  7. GRB080310, optical observations with LBT
  8. GRB 080310: Magellan redshift revision
  9. GRB 080310: Lick/Kast Spectroscopy
  10. GRB080310: Super-LOTIS suggestion of brightening
  11. GRB 080310, SMARTS optical/IR afterglow observations
  12. GRB 080310: REM observations
  13. GRB 080310: Magellan redshift
  14. GRB 080310 afterglow candidate (correction to UT time)
  15. GRB 080310: Swift detection of a burst with optical afterglow
  16. GRB 080310 afterglow candidate
  17. GRB080229, optical upper limit (Correction)
  18. GRB080307, optical upper limit
  19. GRB080307 BOAO optical afterglow observation - detection of a possible OT
  20. GRB080229, optical upper limit
  21. GRB 080307: Swift-XRT Team refined analysis
  22. GRB 080307: Swift/UVOT Upper Limits
  23. GRB 080307: Early RAPTOR Limits
  24. GRB 080307, Swift-BAT refined analysis
  25. GRB080307 - SDSS Pre-Burst Observations
  26. GRB 080307: TNT optical observation
  27. GRB080307: Optical upper limits
  28. GRB 080307: Gemini-N i-band observations - candidate afterglow
  29. GRB 080307: BOAO imaging - retraction and new limit
  30. GRB 080307: retraction of UVOT candidate
  31. GRB 080307: Enhanced Swift-XRT position
  32. GRB 080307, Preliminary Swift-BAT refined analysis
  33. GRB 080307 : BOAO optical afterglow observation
  34. GRB 080307: Optical observation with DMC/KANATA
  35. GRB 080307: Swift detection of a burst
  36. VLA possible radio detection of GRB 080229
  37. GRB 080303: Swift/UVOT follow-up of afterglow detection
  38. GRB 080303, Swift-BAT refined analysis
  39. GRB 080303: Rapid PROMPT Detections
  40. GRB080303: Swift XRT refined analysis
  41. GRB 080303: Enhanced Swift-XRT position
  42. Swift UVOT observations of GRB080229B
  43. GRB080229B: Swift XRT afterglow observation
  44. GRB 080303A: Faulkes Telescope South optical afterglow observations
  45. GRB 080303
  46. GRB 080303: Swift detection of a burst with optical afterglow
  47. GRB 080303: REM NIR afterglow candidate
  48. GRB 080303A: ROTSE-III Optical Limits
  49. GRB 080229: I-band observations from OSN
  50. GRB 080229: VLT NIR observations
  51. GRB080229: Swift XRT refined analysis
  52. GRB 080229: TNG NIR observations
  53. GRB 080229: Deep Gemini/GMOS optical observations
  54. GRB 080229: Enhanced Swift-XRT position
  55. GRB 080229: REM NIR observations
  56. GRB080229: Possible optical afterglow
  57. GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
  58. UVOT analysis for GRB080229
  59. GRB 080229, Swift-BAT refined analysis
  60. GRB 080229: Faulkes Telescope South optical limit
  61. GRB 080229A: ROTSE-III Optical Limits
  62. GRB 080229: Swift detection of a bright burst
  63. Early optical shallow decay in GRB 071112C
  64. GRB080207: optical observations
  65. GRB080205: optical observations
  66. GRB080211: optical observations
  67. XRF 080109/SN2008D : GMRT upper limit at 1.28 GHz
  68. GRB 071010B : Early optical brightening detected by TAOS
  69. Swift-XRT improved positions, and new redshift limits.
  70. ESO optical and NIR observations of GRB 080218B
  71. GRB 080204: Suzaku WAM observation of the prompt emission
  72. GRB 080218B, Swift-BAT refined analysis
  73. GRB 080218B: Swift-XRT refined analysis
  74. Swift/UVOT observations of GRB080218B
  75. GRB 080218B: REM NIR early upper limits
  76. GRB 080212: Mount Abu NIR observations
  77. GRB 080218B: Enhanced Swift-XRT position
  78. GRB 080218B: GROND upper limits
  79. GRB 080218b, SMARTS optical/IR limits
  80. GRB 080218A, Swift-BAT refined analysis
  81. GRB080218B: Watcher prompt limit
  82. GRB 080211: Suzaku WAM observation of the prompt emission
  83. GRB 080218B: Swift detection of a burst
  84. GRB 080218: Swift detection of a burst
  85. Swift-XRT and UVOT observations of the IPN burst GRB 080211
  86. GRB 080212: VLT optical rapid decay
  87. GRB 080212: REM refined analysis
  88. Konus-Wind observation of GRB 080211
  89. VLA radio upper limit on GRB 080212
  90. Swift/UVOT refined analysis of GRB080212
  91. GRB 080212, Swift-BAT refined analysis
  92. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  93. GRB 080212: Gemini-South optical observations
  94. GRB 080212: GROND detects afterglow
  95. GRB 080212: REM NIR afterglow?
  96. GRB 080212: optical observations
  97. GRB 080212: Enhanced Swift-XRT position
  98. GRB 080212: Swift-XRT Team refined analysis
  99. GRB 080210: Keck photometry
  100. VLA non-detection of GRB 080210

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