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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 130603B: Analogy with GRB 090510A and possible connection with a supernova
  2. Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
  3. Trigger 558399: Swift detection of the Soft Gamma Repeater AXP 1E1547.0-5408
  4. Swift Trigger 557910 is not astrophysical
  5. GRB 130615A: Continued Skynet/PROMPT Observations
  6. GRB 130610A: TAROT La Silla observatory optical observations
  7. GRB 130610A: CrAO optical observations
  8. GRB 130615A: Zadko observatory - Gingin optical observations
  9. GRB 130615A: TAROT La Silla observatory optical observations
  10. GRB 130615A: Swift-XRT refined Analysis
  11. GRB 130614A: Fermi GBM detection
  12. GRB 130615A: Swift/UVOT Upper Limits
  13. GRB 130615A: Skynet/PROMPT Observations
  14. GRB 130615A: Enhanced Swift-XRT position
  15. GRB 130615A: Swift-BAT refined analysis
  16. GRB 130615A: GROND afterglow candidate
  17. GRB 130615A: Swift detection of a burst
  18. GRB 130612A: Fermi GBM observation
  19. GRB 130603B: Detection of possible afterglow/kilonova in HST observations
  20. GRB 130612A: iTelescope T21 optical observations
  21. GRB 130603B: HST limits on an underlying supernova
  22. GRB 130606B: Suzaku WAM observation of the prompt emission
  23. GRB 130610A: iTelescope T21 optical observations
  24. GRB 130612A: ISON-NM optical observations
  25. GRB 130612A: MITSuME Okayama upper limits
  26. GRB 130609B: Theoretical redshift estimation
  27. GRB 130612A: Swift/UVOT Detection
  28. GRB 130612A: Swift-XRT refined Analysis
  29. GRB 130612A: Zadko observatory - Gingin optical observations
  30. GRB 130612A: Enhanced Swift-XRT position
  31. GRB 130612A: TAROT La Silla observatory optical observations
  32. GRB 130612A: VLT/X-shooter redshift
  33. GRB130612A OSN I-band observations
  34. GRB 130612A: RATIR Optical Observations
  35. GRB 130612A: P60 Observations
  36. GRB 130612A: NOT optical observations
  37. GRB 130612A: Skynet/PROMPT detection of the optical afterglow
  38. GRB 130612A: PAIRITEL NIR Afterglow Observations
  39. GRB 130612A: Liverpool Telescope Afterglow detection
  40. GRB 130612A: Swift detection of a burst with an optical counterpart
  41. Recent Fermi GBM particle triggers misclassified as GRBs
  42. Konus-Wind observation of GRB 130610B
  43. GRB 130609A: Swift/UVOT Upper Limits
  44. GRB 130608A: Swift/UVOT Upper Limits
  45. GRB 130609B: Fermi GBM observation
  46. IPN Triangulation of GRB 130610B (long/multipeaked)
  47. GRB 130609B, Further Swift-BAT refined analysis
  48. GRB 130609B: GROND observations
  49. GMRT radio observation of GRB 130603B
  50. GRB 130606A: CrAO optical upper limit
  51. GRB 130609A: Radio Observations (5.8, 22 and 85 GHz)
  52. GRB 130609B, Swift-BAT refined analysis
  53. GRB 130608A: ISON-Kislovodsk optical upper limit
  54. GRB 130610A: ISON-NM optical observations
  55. GRB 130610A: Swift/UVOT Observations
  56. GRB 130610A: Fermi GBM Observation
  57. GRB 130609B: Swift/UVOT Observations
  58. Konus-Wind observation of GRB 130609B
  59. GRB 130606B: Swift/UVOT Upper Limit
  60. GRB 130610A: LOAO BVR Observation
  61. GRB 130610A: Swift-XRT refined Analysis
  62. GRB 130609B: Swift-XRT refined Analysis
  63. GRB 130610A: Enhanced Swift-XRT position
  64. GRB 130608A: Further Swift-BAT analysis
  65. GRB 130610A, Swift-BAT refined analysis
  66. GRB 130610A: VLT/UVES redshift
  67. GRB 130609B: Enhanced Swift-XRT position
  68. GRB 130610A: P60 Observations
  69. GRB 130610A: PAIRITEL NIR Afterglow Observations
  70. GRB 130610A: Skynet/PROMPT detection of the optical afterglow
  71. GRB 130610A - Liverpool Telescope Optical Afterglow Confirmation
  72. GRB 130610A: Swift detection of a burst with an optical counterpart
  73. GRB 130609B: Swift detection of a burst with an optical counterpart
  74. GRB 130606A - Liverpool Telescope and Faulkes Telescope North optical observations
  75. GRB 130609A: Fermi GBM observation
  76. GRB 130608A: Swift-XRT refined Analysis
  77. GRB 130609A: Swift-XRT refined Analysis
  78. GRB 130608A: RATIR Optical and NIR Observations
  79. GRB 130609A: Enhanced Swift-XRT position
  80. GRB 130609A, Swift-BAT refined analysis
  81. GRB 130608A: Swift-BAT refined analysis
  82. GRB 130608A: Enhanced Swift-XRT position
  83. GRB 130609A: RATIR Optical and NIR Observations
  84. GRB 130609A: P60 nondetection
  85. GRB130608A: BOOTES-2/TELMA upper limits
  86. GRB 130609A: Swift detection of a burst
  87. GRB 130608A: Swift detection of a burst
  88. GRB 130606A: Continued Skynet/PROMPT observations
  89. Swift Trigger 557674 was due to an onboard position error
  90. GRB 130606A: Continued RATIR Optical and NIR Monitoring
  91. GRB 130606B: AGILE-MCAL observation
  92. GRB 130606B: RATIR Optical and NIR Observations
  93. Swift Trigger 557674 is a probable new Galactic transient
  94. GRB 130606B: Swift-XRT observations
  95. GRB 130606A, Swift-BAT refined analysis
  96. GRB 130606A: TAROT Calern observatory early optical observations
  97. GRB 130606A: EVLA detection
  98. GRB 130606A: VLT/X-shooter redshift confirmation
  99. GRB 130606A: Skynet/PROMPT detection of the optical afterglow
  100. GRB 130606A: Swift/UVOT Upper Limits

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