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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 081007: Radio Detection
  2. Konus-Wind observation of GRB 081001
  3. GRB 081007: Rapid PROMPT Detections
  4. GRB 081008, Swift-BAT refined analysis
  5. GRB 081008: VLT redshift confirmation
  6. GRB 081008: Swift-XRT Refined Analysis
  7. GRB081008: Swift/UVOT observations
  8. GRB 081008: Enhanced Swift-XRT position
  9. GRB 081008: Gemini-South Absorption Redshiftt
  10. GRB 081008: VLT/FORS2 spectroscopy
  11. GRB 081008: Swift detection of a burst with optical afterglow
  12. GRB 081008: ROTSE-III Detection of Optical Counterpart
  13. GRB081006B: Fermi GBM detection
  14. GRB081006: Fermi GBM detection
  15. GRB081007: Swift/UVOT Observations
  16. GRB 081007, SMARTS optical afterglow observations
  17. GRB 081007, Swift-BAT refined analysis
  18. GRB 081007: Early RAPTOR measurements of optical counterpart
  19. GRB 081007: Swift-XRT Team refined analysis
  20. GRB 081007: Gemini-south redshift
  21. GRB 081007: Enhanced Swift-XRT position
  22. GRB 081007, Faulkes Telescope North optical observations
  23. GRB 081007, SMARTS optical/IR afterglow observations
  24. GRB 081007: REM NIR and optical counterpart
  25. GRB 081007: Swift detection of a burst with optical afterglow
  26. GRB081003C: GLAST Burst Monitor detection
  27. Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
  28. INTEGRAL ToO observation of the AXP 1E 1547.0-5408
  29. GRB 081003B: TAROT Calern observatory optical observations
  30. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  31. GRB 081003B: Swift-XRT upper limit
  32. GRB 081003A: OSN optical observations
  33. GRB 081001: Further observations from OSN
  34. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  35. GRB081003B: Optical limits from Spain
  36. GRB 081003A: Swift-XRT Team position and analysis
  37. Swift-BAT refined analysis of AXP 1E1547.0-5408 (Trigger 330353)
  38. GRB 081003B: a long GRB detected with INTEGRAL
  39. GRB 080928: Fermi GBM detection
  40. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  41. GRB 081003: A long GRB discovered by INTEGRAL
  42. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  43. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  44. Trigger 330353: Swift detection of a Galactic short soft burst
  45. GRB 081001: Observations from OSN
  46. GRB 080925: Suzaku WAM observation of the prompt emission
  47. GRB 081001: Swift UVOT Observations
  48. GRB 081001: Swift-XRT position
  49. GRB081001: optical limit from ASH-Centurion
  50. GRB081001: SuperAGILE Localization of a long GRB
  51. GRB080928: redshift retraction
  52. GRB 080928: Watcher observations
  53. GRB 080927: Fermi GBM detection
  54. GRB 080928: VLT redshift
  55. GRB080928: Gemini-South Absorption Redshift
  56. GRB 080928: Swift-XRT refined analysis
  57. GRB 080928: Swift/UVOT observations
  58. GRB 080928, Swift-BAT final refined analysis
  59. GRB 080928: GROND DETECTION
  60. GRB 080928: Enhanced Swift-XRT position
  61. GRB 080928, Swift-BAT initial refined analysis
  62. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  63. GRB 080928: Swift detection of a burst with an optical counterpart
  64. GRB 080925: Fermi GBM Detection
  65. GRB 080920: Fermi GBM detection
  66. GRB080922, optical upper limit
  67. Swift-BAT trigger 325707 is not a GRB
  68. Swift trigger 325707: Swift/UVOT Upper Limits
  69. Swift trigger 325707: Swift-XRT upper limit
  70. Swift detection of a possible GRB (trigger 325707)
  71. GRB080916A: Suzaku WAM observation of the prompt emission
  72. GRB 080922: Swift/UVOT Upper Limits
  73. GRB080922: Swift-XRT upper limit
  74. GRB080922: A long GRB detected by INTEGRAL
  75. GRB 080913B: Fermi GBM detection
  76. Trigger 324561: IGR J08408-4503 detected by Swift
  77. GRB 080916C: Fermi GBM Spectral Analysis
  78. GRB 080919: Swift/UVOT Refined Analysis
  79. GRB 080919: Swift-XRT refined analysis
  80. GRB 080919, Swift-BAT refined analysis
  81. GRB 080916C: IRSF/SIRUS NIR Observation
  82. GRB 080916C: GROND Confirmation of the Optical Afterglow
  83. GRB 080916C: GROND Confirmation of the Optical Afterglow
  84. GRB 080919: REM NIR observations
  85. GRB 080919: Swift detection of a short burst
  86. Fermi/GBM Data Now Available
  87. GRB 080915A: GROND upper limits
  88. GRB080913: Swift-BAT spectral lag
  89. GRB 080916A: GROND lightcurve
  90. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  91. GRB 080916A: Rapid PROMPT Observations
  92. GRB 080916A: Fermi GBM detection
  93. GRB 080916C: Swift UVOT Refined Analysis
  94. GRB 080916C: Swift XRT refined analysis
  95. GRB 080916B: Swift-XRT refined analysis
  96. Konus-Wind observation of GRB 080916A
  97. Konus-Wind observation of GRB 080916C
  98. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  99. GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
  100. GRB 080916C: Enhanced XRT position

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