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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"

28057 results found.

  1. GRB 090323: UVOT Detection of Afterglow
  2. GRB 090324: SuperAGILE Localization of a Long GRB
  3. GRB 090323: P60 Afterglow Confirmation
  4. GRB 090323: GROND Detection of the Afterglow and Photo-z
  5. GRB 090323: Possible XRT Counterpart
  6. GRB 090320C: Fermi GBM Detection
  7. GRB 090320B: Fermi GBM detection.
  8. GRB 090319: Fermi GBM detection
  9. GRB 090320A: Fermi GBM detection
  10. Further 15GHz observations of GRB090313
  11. X-shooter observations of GRB 090313
  12. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  13. GRB 090315: Suzaku WAM observation of the prompt emission
  14. GRB090313: radio detection with the VLA
  15. IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
  16. Further radio observation of GRB 090313
  17. GRB 090313: detection with CARMA in 3mm band
  18. GRB090305B: MASTER-net prompt optical short burst observations
  19. GRB 090313: MITSuME Okayama observation
  20. GRB 090313: Additional Gemini-S photometry
  21. GRB 090313: TAROT La Silla observatory optical detection
  22. GRB 090313: Zadko Telescope observations
  23. GRB 090313 optical observations
  24. GRB 090313: Ongoing plateau phase
  25. GRB 090313: Swift-XRT refined analysis
  26. GRB 090313: Swift/UVOT upper limits
  27. GRB 090313: Swift-BAT refined analysis
  28. GRB 090313, GROND observations
  29. GRB 090309, Swift-BAT lag analysis
  30. Swift trigger 346250 is probably not a burst
  31. GRB090310: Fermi GBM detection
  32. GRB 090205: Zadko Telescope late-time observations
  33. GRB 090309A: GROND upper limits
  34. GRB 090307A: TAROT Calern observatory optical observations
  35. GRB 090309: Swift/UVOT Upper Limits
  36. GRB090305B: Fermi GBM detection
  37. GRB 090309B: Fermi GBM detection
  38. GRB 090309: Swift-XRT refined analysis
  39. GRB 090309: Enhanced Swift-XRT position
  40. GRB 090309, Swift-BAT refined analysis
  41. GRB 090308: GROND observations
  42. GRB 090308: Gemini GMOS Observations
  43. GRB 090309: Swift detection of a burst
  44. GRB 090308B: Fermi GBM detection
  45. GRB 090308: Swift/UVOT Upper Limits
  46. GRB 090307B: Fermi GBM detection
  47. GRB 090306C: Fermi GBM detection
  48. GRB 090307: GROND Upper Limits
  49. GRB 090306B: GROND Upper Limits
  50. GRB 090308: Swift-XRT refined analysis
  51. Radio observation of GRB 090201 with ATCA
  52. Radio observation of GRB 090117 with ATCA
  53. Radio observation of GRB 081226b with ATCA
  54. Radio observation of GRB 081226a with ATCA
  55. Radio observation of GRB 081007 with ATCA
  56. GRB 090308: Swift-BAT refined analysis
  57. GRB 090308: Swift detection of a burst
  58. GRB 090306B: Possible XRT afterglow
  59. GRB 090307: Swift-XRT afterglow confirmation and analysis
  60. GRB 090307: Swift-BAT refined analysis of trigger 345551
  61. GRB 090306B: Burst detection from Swift-BAT slew data
  62. Swift Trigger 345551 is probably not a GRB
  63. IPN localization of short GRB 090305C
  64. GRB 090306: Swift detection of a possible burst
  65. GRB 090305: Swift/UVOT Upper Limits
  66. GRB 090305: Swift-XRT refined analysis
  67. GRB 090305, Swift-BAT refined analysis
  68. GRB 090227A: Suzaku WAM observation of the prompt emission
  69. GRB090305: GMOS-S Candidate Optical Afterglow
  70. GRB 090305: Swift detection of a short burst
  71. GRB 090303: Fermi GBM detection
  72. GRB 090304: Fermi GBM detection
  73. GRB 090301A: Suzaku WAM observation of the prompt emission
  74. GRB 090228B: Fermi GBM detection
  75. GRB 090301A: Swift-BAT refined analysis
  76. GRB 090301B: Fermi GBM detection
  77. GRB 090227B: Fermi GBM detection
  78. Swift_BAT_Lightcurve Notice for Trigger Number 344565 is not valid
  79. GRB 090228: Fermi GBM detection
  80. GRB 090227: Fermi GBM detection
  81. GRB 090206: Fermi GBM detection
  82. SGR J1550-5418
  83. GRB 081211B: Nearby cluster
  84. GRB 090222: Fermi GBM detection
  85. GRB 090219: Fermi GBM detection
  86. Swift Trigger 343319 is not a GRB
  87. GRB 090217: Suzaku WAM observation of the prompt emission
  88. GRB090217: XRT analysis
  89. GRB 090213: Fermi GBM detection
  90. GRB 090217: Fermi GBM detection
  91. SGR activity seen by BAT during ICSP Ionospheric Events
  92. GRB 090207 - Fermi GBM Observations
  93. GRB 090129: Fermi GBM detection
  94. VLA radio upper limit on GRB 090205
  95. GRB 090205: Swift/UVOT Upper Limits
  96. GRB 090205: Swift-XRT refined analysis
  97. GRB 090205: GROND observations and photometric redshift estimate
  98. GRB 090205: VLT candidate afterglow
  99. GRB 090205: Swift-BAT refined analysis
  100. GRB 090205: Enhanced Swift-XRT position

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