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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. INTEGRAL ToO observation of the AXP 1E 1547.0-5408
  2. GRB 081003B: TAROT Calern observatory optical observations
  3. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  4. GRB 081003B: Swift-XRT upper limit
  5. GRB 081003A: OSN optical observations
  6. GRB 081001: Further observations from OSN
  7. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  8. GRB081003B: Optical limits from Spain
  9. GRB 081003A: Swift-XRT Team position and analysis
  10. Swift-BAT refined analysis of AXP 1E1547.0-5408 (Trigger 330353)
  11. GRB 081003B: a long GRB detected with INTEGRAL
  12. GRB 080928: Fermi GBM detection
  13. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  14. GRB 081003: A long GRB discovered by INTEGRAL
  15. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  16. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  17. Trigger 330353: Swift detection of a Galactic short soft burst
  18. GRB 081001: Observations from OSN
  19. GRB 080925: Suzaku WAM observation of the prompt emission
  20. GRB 081001: Swift UVOT Observations
  21. GRB 081001: Swift-XRT position
  22. GRB081001: optical limit from ASH-Centurion
  23. GRB081001: SuperAGILE Localization of a long GRB
  24. GRB080928: redshift retraction
  25. GRB 080928: Watcher observations
  26. GRB 080927: Fermi GBM detection
  27. GRB 080928: VLT redshift
  28. GRB080928: Gemini-South Absorption Redshift
  29. GRB 080928: Swift-XRT refined analysis
  30. GRB 080928: Swift/UVOT observations
  31. GRB 080928, Swift-BAT final refined analysis
  32. GRB 080928: GROND DETECTION
  33. GRB 080928: Enhanced Swift-XRT position
  34. GRB 080928, Swift-BAT initial refined analysis
  35. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  36. GRB 080928: Swift detection of a burst with an optical counterpart
  37. GRB 080925: Fermi GBM Detection
  38. GRB 080920: Fermi GBM detection
  39. GRB080922, optical upper limit
  40. Swift-BAT trigger 325707 is not a GRB
  41. Swift trigger 325707: Swift/UVOT Upper Limits
  42. Swift trigger 325707: Swift-XRT upper limit
  43. Swift detection of a possible GRB (trigger 325707)
  44. GRB080916A: Suzaku WAM observation of the prompt emission
  45. GRB 080922: Swift/UVOT Upper Limits
  46. GRB080922: Swift-XRT upper limit
  47. GRB080922: A long GRB detected by INTEGRAL
  48. GRB 080913B: Fermi GBM detection
  49. Trigger 324561: IGR J08408-4503 detected by Swift
  50. GRB 080916C: Fermi GBM Spectral Analysis
  51. GRB 080919: Swift/UVOT Refined Analysis
  52. GRB 080919: Swift-XRT refined analysis
  53. GRB 080919, Swift-BAT refined analysis
  54. GRB 080916C: IRSF/SIRUS NIR Observation
  55. GRB 080916C: GROND Confirmation of the Optical Afterglow
  56. GRB 080916C: GROND Confirmation of the Optical Afterglow
  57. GRB 080919: REM NIR observations
  58. GRB 080919: Swift detection of a short burst
  59. Fermi/GBM Data Now Available
  60. GRB 080915A: GROND upper limits
  61. GRB080913: Swift-BAT spectral lag
  62. GRB 080916A: GROND lightcurve
  63. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  64. GRB 080916A: Rapid PROMPT Observations
  65. GRB 080916A: Fermi GBM detection
  66. GRB 080916C: Swift UVOT Refined Analysis
  67. GRB 080916C: Swift XRT refined analysis
  68. GRB 080916B: Swift-XRT refined analysis
  69. Konus-Wind observation of GRB 080916A
  70. Konus-Wind observation of GRB 080916C
  71. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  72. GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
  73. GRB 080916C: Enhanced XRT position
  74. GRB080916A: Spectroscopic redshift
  75. GRB 080916C: Swift/XRT detection of possible afterglow
  76. GRB 080916B: Swift UVOT Refined Analysis
  77. IPN Triangulation and Energy Spectrum of GRB080916C
  78. GRB 080916B, Swift-BAT refined analysis
  79. GRB080916A: Refined Swift/UVOT Observations
  80. GRB 080915a, SMARTS optical/IR observations
  81. GRB 080916B: Enhanced Swift-XRT position
  82. GRB 080916C: Fermi LAT observation
  83. GRB 080916C: Fermi GBM Detection
  84. GRB 080916A: Swift XRT refined analysis
  85. GRB 080916A, Swift-BAT refined analysis
  86. GRB 080916B: Swift-XRT afterglow detection
  87. GRB 080916A: Enhanced Swift-XRT position
  88. GRB 080916B: Swift detection of a burst
  89. GRB 080916: REM detection of the NIR afterglow
  90. GRB 080916: REM candidate afterglow
  91. GRB 080916: Swift detection of a burst with optical afterglow
  92. GRB 080915B, Swift-BAT refined analysis
  93. GRB 080912 : Fermi GBM detection
  94. GRB 080915B: Swift detection of a burst
  95. GRB 080915: REM NIR early observations
  96. GRB 080915: Swift/UVOT Upper Limits
  97. GRB 080915: Swift-XRT afterglow detection and analysis
  98. GRB 080915, Swift-BAT refined analysis
  99. SGR 0501+4516 : P200 i-band observations
  100. GRB 080915: ROTSE-III Optical Limits

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