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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. IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
  2. GRB 090313, SMARTS optical/IR observations
  3. Further radio observation of GRB 090313
  4. Further Swift/UVOT observations of GRB 090313
  5. GRB 090313: detection with CARMA in 3mm band
  6. GRB090305B: MASTER-net prompt optical short burst observations
  7. Radio detection of GRB090313
  8. GRB 090313: MITSuME Okayama observation
  9. GRB 090313: Additional Gemini-S photometry
  10. GRB 090313: WSRT Radio Observations
  11. GRB 090313: Light curve steepening
  12. GRB 090313: TAROT La Silla observatory optical detection
  13. GRB 090313: Gemini-S photometry
  14. GRB 090313: Zadko Telescope observations
  15. GRB 090313 - PAIRITEL NIR detections
  16. GRB 090313: Gemini-S redshift
  17. GRB 090313 optical observations
  18. GRB 090313: Ongoing plateau phase
  19. GRB 090313: Swift-XRT refined analysis
  20. GRB 090313: Swift/UVOT upper limits
  21. GRB 090313: Faulkes Telescope North observations
  22. GRB 090313: Sustained optical brightness (correction)
  23. GRB 090306B: Confirmation of the X-ray afterglow
  24. GRB 090313: Swift-BAT refined analysis
  25. GRB 090313: Sustained optical brightness
  26. GRB 090313: SDSS object underlying the optical afterglow position
  27. GRB 090313, GROND observations
  28. GRB 090309, Swift-BAT lag analysis
  29. GRB 090313: Swift detection of a burst
  30. GRB 090313: Swift detection of a burst
  31. GRB 090313 OA candidate
  32. Swift trigger 346250 is probably not a burst
  33. GRB090310: Fermi GBM detection
  34. GRB 090205: Zadko Telescope late-time observations
  35. GRB 090309A: GROND upper limits
  36. GRB 090307A: TAROT Calern observatory optical observations
  37. GRB 090309: Swift/UVOT Upper Limits
  38. GRB090305B: Fermi GBM detection
  39. GRB 090309B: Fermi GBM detection
  40. GRB 090309: Swift-XRT refined analysis
  41. GRB 090309: Enhanced Swift-XRT position
  42. GRB 090306B: INTEGRAL SPI-ACS light curve
  43. GRB 090309, Swift-BAT refined analysis
  44. GRB 090308: GROND observations
  45. GRB 090308: Gemini GMOS Observations
  46. GRB 090309: Swift detection of a burst
  47. GRB 090308B: Fermi GBM detection
  48. GRB 090308: Swift/UVOT Upper Limits
  49. GRB 090307B: Fermi GBM detection
  50. GRB 090306C: Fermi GBM detection
  51. GRB 090307: GROND Upper Limits
  52. GRB 090306B: GROND Upper Limits
  53. GRB 090305C: Suzaku WAM observation of the prompt emission
  54. GRB 090308: Swift-XRT refined analysis
  55. Radio observation of GRB 090201 with ATCA
  56. Radio observation of GRB 090117 with ATCA
  57. Radio observation of GRB 081226b with ATCA
  58. Radio observation of GRB 081226a with ATCA
  59. Radio observation of GRB 081007 with ATCA
  60. ATCA observation of SGR J1550-5418
  61. GRB 090308: Swift-BAT refined analysis
  62. GRB 090308: Swift detection of a burst
  63. GRB 090306B: Possible XRT afterglow
  64. GRB 090307: Swift-XRT afterglow confirmation and analysis
  65. GRB 090307: Swift-BAT refined analysis of trigger 345551
  66. GRB 090306B: Burst detection from Swift-BAT slew data
  67. Swift Trigger 345551 is probably not a GRB
  68. Swift-BAT trigger 345396 is not a GRB
  69. IPN localization of short GRB 090305C
  70. Fermi GBM trigger 090305784 is not a GRB
  71. GRB 090306: Swift detection of a possible burst
  72. GRB 090305: Swift/UVOT Upper Limits
  73. GRB 090305: Swift-XRT refined analysis
  74. GRB 090305, Swift-BAT refined analysis
  75. GRB 090227A: Suzaku WAM observation of the prompt emission
  76. GRB 090305: Magellan confirmation of the optical afterglow
  77. GRB090305: GMOS-S Candidate Optical Afterglow
  78. GRB 090305: Swift detection of a short burst
  79. GRB 090303: Fermi GBM detection
  80. GRB 090304: Fermi GBM detection
  81. GRB 090301A: Suzaku WAM observation of the prompt emission
  82. Konus-RF catches first GRB and SGR bursts
  83. GRB 090228B: Fermi GBM detection
  84. Konus-Wind observation of bright short GRB 090227B
  85. IPN localization of short bright GRB 090227B
  86. Konus-Wind observation of GRB 090301A
  87. GRB 090301A: Swift-BAT refined analysis
  88. GRB 090301B: Fermi GBM detection
  89. GRB 090227B: Fermi GBM detection
  90. GRB 090301: Swift detection of a burst
  91. Swift_BAT_Lightcurve Notice for Trigger Number 344565 is not valid
  92. GRB 090228: Fermi GBM detection
  93. GRB 090227: Fermi GBM detection
  94. GRB 090206: Fermi GBM detection
  95. SGR J1550-5418
  96. GRB 081211B: Nearby cluster
  97. Ongoing activity of AXP/SGR 1E1547.0-5408
  98. GRB 090222: Fermi GBM detection
  99. GRB 090219: Fermi GBM detection
  100. Swift Restored

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