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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"

31741 results found.

  1. GRB 090324: Suzaku WAM observation of the prompt emission
  2. GRB 090328: Radio afterglow detection
  3. GRB 090328: BOOTES-3 optical observations
  4. GRB 090328: Fermi GBM Spectral Analysis
  5. GRB 090328: GROND Detection of the Optical/NIR Afterglow
  6. GRB 090328: Gemini South Redshift
  7. GRB 090328: Swift XRT refined analysis
  8. GRB090323: Optical observations from NOT
  9. Konus-Wind observation of GRB 090328
  10. GRB 090328: IPN Triangulation
  11. GRB 090328: Swift UVOT observations
  12. GRB 090323: WSRT Radio Detection
  13. GRB 090328: Possible Swift/XRT detection
  14. GRB 090323: Radio afterglow detection
  15. GRB 090323: Additional Lick observations
  16. GRB 090323: TLS detection at 5 days, no break
  17. GRB 090323: Faulkes Telescope South Observations
  18. GRB 090320B: MASTER-Net prompt optical observations
  19. GRB 090323: RTT150 optical observations
  20. GRB 090323: Lick observations
  21. GRB 090323: Fermi GBM Spectral Analysis
  22. GRB 090323: Optical observation of xinglong TNT
  23. GRB 090323 TLS detection - still bright
  24. GRB 090323: UVOT Detection of Afterglow
  25. GRB 090323: Swift-XRT refined analysis
  26. Konus-Wind observation of GRB 090323
  27. GRB 090323 Gemini-South Redshift
  28. GRB 090323: P60 Afterglow Confirmation
  29. GRB 090323: GROND Detection of the Afterglow and Photo-z
  30. SGR J1550-5418: two Fermi GBM triggers on March 22
  31. GRB 090323: Possible XRT Counterpart
  32. IPN triangulation of GRB090323
  33. Further 15GHz observations of GRB090313
  34. GRB 090313: WSRT Radio Detection
  35. X-shooter observations of GRB 090313
  36. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  37. GRB 090315: Suzaku WAM observation of the prompt emission
  38. GRB 090313: VLT spectroscopy
  39. GRB090313: radio detection with the VLA
  40. Konus-Wind observation of GRB 090315
  41. IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
  42. GRB 090313, SMARTS optical/IR observations
  43. Further Swift/UVOT observations of GRB 090313
  44. GRB 090313: detection with CARMA in 3mm band
  45. GRB090305B: MASTER-net prompt optical short burst observations
  46. Radio detection of GRB090313
  47. GRB 090313: MITSuME Okayama observation
  48. GRB 090313: Additional Gemini-S photometry
  49. GRB 090313: WSRT Radio Observations
  50. GRB 090313: Gemini-S photometry
  51. GRB 090313: Zadko Telescope observations
  52. GRB 090313 - PAIRITEL NIR detections
  53. GRB 090313: Gemini-S redshift
  54. GRB 090313 optical observations
  55. GRB 090313: Ongoing plateau phase
  56. GRB 090313: Swift-XRT refined analysis
  57. GRB 090313: Swift/UVOT upper limits
  58. GRB 090313: Faulkes Telescope North observations
  59. GRB 090313: Sustained optical brightness (correction)
  60. GRB 090306B: Confirmation of the X-ray afterglow
  61. GRB 090313: Swift-BAT refined analysis
  62. GRB 090313: Sustained optical brightness
  63. GRB 090313: SDSS object underlying the optical afterglow position
  64. GRB 090313, GROND observations
  65. GRB 090309, Swift-BAT lag analysis
  66. GRB 090205: Zadko Telescope late-time observations
  67. GRB 090309A: GROND upper limits
  68. GRB 090309: Swift/UVOT Upper Limits
  69. GRB 090309: Swift-XRT refined analysis
  70. GRB 090306B: INTEGRAL SPI-ACS light curve
  71. GRB 090309, Swift-BAT refined analysis
  72. GRB 090308: GROND observations
  73. GRB 090308: Gemini GMOS Observations
  74. GRB 090308: Swift/UVOT Upper Limits
  75. GRB 090307: GROND Upper Limits
  76. GRB 090306B: GROND Upper Limits
  77. GRB 090305C: Suzaku WAM observation of the prompt emission
  78. GRB 090308: Swift-XRT refined analysis
  79. Radio observation of GRB 090201 with ATCA
  80. Radio observation of GRB 090117 with ATCA
  81. Radio observation of GRB 081226b with ATCA
  82. Radio observation of GRB 081226a with ATCA
  83. Radio observation of GRB 081007 with ATCA
  84. ATCA observation of SGR J1550-5418
  85. GRB 090308: Swift-BAT refined analysis
  86. GRB 090306B: Possible XRT afterglow
  87. GRB 090307: Swift-XRT afterglow confirmation and analysis
  88. GRB 090307: Swift-BAT refined analysis of trigger 345551
  89. Swift Trigger 345551 is probably not a GRB
  90. GRB 090305: Swift/UVOT Upper Limits
  91. GRB 090305: Swift-XRT refined analysis
  92. GRB 090305, Swift-BAT refined analysis
  93. GRB 090227A: Suzaku WAM observation of the prompt emission
  94. GRB 090305: Magellan confirmation of the optical afterglow
  95. GRB090305: GMOS-S Candidate Optical Afterglow
  96. GRB 090301A: Suzaku WAM observation of the prompt emission
  97. Konus-RF catches first GRB and SGR bursts
  98. Konus-Wind observation of bright short GRB 090227B
  99. IPN localization of short bright GRB 090227B
  100. Konus-Wind observation of GRB 090301A

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