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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"

28050 results found.

  1. GRB 090319: Fermi GBM detection
  2. GRB 090320A: Fermi GBM detection
  3. Further 15GHz observations of GRB090313
  4. X-shooter observations of GRB 090313
  5. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  6. GRB 090315: Suzaku WAM observation of the prompt emission
  7. GRB090313: radio detection with the VLA
  8. IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
  9. Further radio observation of GRB 090313
  10. GRB 090313: detection with CARMA in 3mm band
  11. GRB090305B: MASTER-net prompt optical short burst observations
  12. GRB 090313: MITSuME Okayama observation
  13. GRB 090313: Additional Gemini-S photometry
  14. GRB 090313: TAROT La Silla observatory optical detection
  15. GRB 090313: Zadko Telescope observations
  16. GRB 090313 optical observations
  17. GRB 090313: Ongoing plateau phase
  18. GRB 090313: Swift-XRT refined analysis
  19. GRB 090313: Swift/UVOT upper limits
  20. GRB 090313: Swift-BAT refined analysis
  21. GRB 090313, GROND observations
  22. GRB 090309, Swift-BAT lag analysis
  23. Swift trigger 346250 is probably not a burst
  24. GRB090310: Fermi GBM detection
  25. GRB 090205: Zadko Telescope late-time observations
  26. GRB 090309A: GROND upper limits
  27. GRB 090307A: TAROT Calern observatory optical observations
  28. GRB 090309: Swift/UVOT Upper Limits
  29. GRB090305B: Fermi GBM detection
  30. GRB 090309B: Fermi GBM detection
  31. GRB 090309: Swift-XRT refined analysis
  32. GRB 090309: Enhanced Swift-XRT position
  33. GRB 090309, Swift-BAT refined analysis
  34. GRB 090308: GROND observations
  35. GRB 090308: Gemini GMOS Observations
  36. GRB 090309: Swift detection of a burst
  37. GRB 090308B: Fermi GBM detection
  38. GRB 090308: Swift/UVOT Upper Limits
  39. GRB 090307B: Fermi GBM detection
  40. GRB 090306C: Fermi GBM detection
  41. GRB 090307: GROND Upper Limits
  42. GRB 090306B: GROND Upper Limits
  43. GRB 090308: Swift-XRT refined analysis
  44. Radio observation of GRB 090201 with ATCA
  45. Radio observation of GRB 090117 with ATCA
  46. Radio observation of GRB 081226b with ATCA
  47. Radio observation of GRB 081226a with ATCA
  48. Radio observation of GRB 081007 with ATCA
  49. GRB 090308: Swift-BAT refined analysis
  50. GRB 090308: Swift detection of a burst
  51. GRB 090306B: Possible XRT afterglow
  52. GRB 090307: Swift-XRT afterglow confirmation and analysis
  53. GRB 090307: Swift-BAT refined analysis of trigger 345551
  54. GRB 090306B: Burst detection from Swift-BAT slew data
  55. Swift Trigger 345551 is probably not a GRB
  56. IPN localization of short GRB 090305C
  57. GRB 090306: Swift detection of a possible burst
  58. GRB 090305: Swift/UVOT Upper Limits
  59. GRB 090305: Swift-XRT refined analysis
  60. GRB 090305, Swift-BAT refined analysis
  61. GRB 090227A: Suzaku WAM observation of the prompt emission
  62. GRB090305: GMOS-S Candidate Optical Afterglow
  63. GRB 090305: Swift detection of a short burst
  64. GRB 090303: Fermi GBM detection
  65. GRB 090304: Fermi GBM detection
  66. GRB 090301A: Suzaku WAM observation of the prompt emission
  67. GRB 090228B: Fermi GBM detection
  68. GRB 090301A: Swift-BAT refined analysis
  69. GRB 090301B: Fermi GBM detection
  70. GRB 090227B: Fermi GBM detection
  71. Swift_BAT_Lightcurve Notice for Trigger Number 344565 is not valid
  72. GRB 090228: Fermi GBM detection
  73. GRB 090227: Fermi GBM detection
  74. GRB 090206: Fermi GBM detection
  75. SGR J1550-5418
  76. GRB 081211B: Nearby cluster
  77. GRB 090222: Fermi GBM detection
  78. GRB 090219: Fermi GBM detection
  79. Swift Trigger 343319 is not a GRB
  80. GRB 090217: Suzaku WAM observation of the prompt emission
  81. GRB090217: XRT analysis
  82. GRB 090213: Fermi GBM detection
  83. GRB 090217: Fermi GBM detection
  84. SGR activity seen by BAT during ICSP Ionospheric Events
  85. GRB 090207 - Fermi GBM Observations
  86. GRB 090129: Fermi GBM detection
  87. VLA radio upper limit on GRB 090205
  88. GRB 090205: Swift/UVOT Upper Limits
  89. GRB 090205: Swift-XRT refined analysis
  90. GRB 090205: GROND observations and photometric redshift estimate
  91. GRB 090205: VLT candidate afterglow
  92. GRB 090205: Swift-BAT refined analysis
  93. GRB 090205: Enhanced Swift-XRT position
  94. GRB 090205: Swift detection of a burst
  95. GRB 080319B: IceCube upper limit on high-energy neutrino flux
  96. GRB 090131: Suzaku WAM observation of the prompt emission
  97. GRB 090202: Fermi GBM detection
  98. GRB 090131: Fermi GBM detection
  99. GRB 090201: Swift-XRT refined analysis
  100. GRB090201: Swift UVOT upper limits

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