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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

23575 results found.

  1. GRB 090327: Fermi GBM detection
  2. GRB 090320B: MASTER-Net prompt optical observations
  3. GRB 090323: UVOT Detection of Afterglow
  4. GRB 090323: Swift-XRT refined analysis
  5. GRB 090324: SuperAGILE Localization of a Long GRB
  6. GRB 090323: P60 Afterglow Confirmation
  7. GRB 090323: GROND Detection of the Afterglow and Photo-z
  8. GRB 090323: Possible XRT Counterpart
  9. IPN triangulation of GRB090323
  10. GRB 090320C: Fermi GBM Detection
  11. GRB 090320B: Fermi GBM detection.
  12. GRB 090319: Fermi GBM detection
  13. GRB 090320A: Fermi GBM detection
  14. Further 15GHz observations of GRB090313
  15. X-shooter observations of GRB 090313
  16. GRB090313: radio detection with the VLA
  17. IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
  18. Further radio observation of GRB 090313
  19. Further Swift/UVOT observations of GRB 090313
  20. GRB 090313: detection with CARMA in 3mm band
  21. GRB090305B: MASTER-net prompt optical short burst observations
  22. GRB 090313: MITSuME Okayama observation
  23. GRB 090313: Additional Gemini-S photometry
  24. GRB 090313: TAROT La Silla observatory optical detection
  25. GRB 090313: Zadko Telescope observations
  26. GRB 090313 optical observations
  27. GRB 090313: Ongoing plateau phase
  28. GRB 090313: Swift-XRT refined analysis
  29. GRB 090313: Swift/UVOT upper limits
  30. GRB 090313: Sustained optical brightness (correction)
  31. GRB 090306B: Confirmation of the X-ray afterglow
  32. GRB 090313, GROND observations
  33. GRB 090309, Swift-BAT lag analysis
  34. GRB 090313: Swift detection of a burst
  35. GRB 090313: Swift detection of a burst
  36. Swift trigger 346250 is probably not a burst
  37. GRB090310: Fermi GBM detection
  38. GRB 090205: Zadko Telescope late-time observations
  39. GRB 090309A: GROND upper limits
  40. GRB 090307A: TAROT Calern observatory optical observations
  41. GRB 090309: Swift/UVOT Upper Limits
  42. GRB090305B: Fermi GBM detection
  43. GRB 090309B: Fermi GBM detection
  44. GRB 090309: Enhanced Swift-XRT position
  45. GRB 090308: GROND observations
  46. GRB 090308: Gemini GMOS Observations
  47. GRB 090309: Swift detection of a burst
  48. GRB 090308B: Fermi GBM detection
  49. GRB 090308: Swift/UVOT Upper Limits
  50. GRB 090307B: Fermi GBM detection
  51. GRB 090306C: Fermi GBM detection
  52. GRB 090307: GROND Upper Limits
  53. GRB 090306B: GROND Upper Limits
  54. GRB 090308: Swift-XRT refined analysis
  55. GRB 090308: Swift detection of a burst
  56. GRB 090306B: Possible XRT afterglow
  57. GRB 090307: Swift-XRT afterglow confirmation and analysis
  58. Swift Trigger 345551 is probably not a GRB
  59. IPN localization of short GRB 090305C
  60. GRB 090306: Swift detection of a possible burst
  61. GRB 090305: Swift/UVOT Upper Limits
  62. GRB 090305: Swift-XRT refined analysis
  63. GRB090305: GMOS-S Candidate Optical Afterglow
  64. GRB 090305: Swift detection of a short burst
  65. GRB 090303: Fermi GBM detection
  66. GRB 090304: Fermi GBM detection
  67. Konus-RF catches first GRB and SGR bursts
  68. GRB 090228B: Fermi GBM detection
  69. IPN localization of short bright GRB 090227B
  70. GRB 090301B: Fermi GBM detection
  71. GRB 090227B: Fermi GBM detection
  72. GRB 090301: Swift detection of a burst
  73. GRB 090228: Fermi GBM detection
  74. GRB 090227: Fermi GBM detection
  75. GRB 090206: Fermi GBM detection
  76. GRB 081211B: Nearby cluster
  77. GRB 090222: Fermi GBM detection
  78. GRB 090219: Fermi GBM detection
  79. GRB090217: XRT analysis
  80. IPN localization of GRB 090217
  81. GRB 090213: Fermi GBM detection
  82. GRB 090217: Fermi GBM detection
  83. SGR activity seen by BAT during ICSP Ionospheric Events
  84. GRB 090207 - Fermi GBM Observations
  85. VLA radio upper limit on GRB 090205
  86. GRB 090205: VLT optical decay
  87. GRB 090205: Swift/UVOT Upper Limits
  88. GRB 090205: Swift-XRT refined analysis
  89. GRB 090205: GROND observations and photometric redshift estimate
  90. GRB 090205: VLT candidate afterglow
  91. GRB 090205: Swift-BAT refined analysis
  92. GRB 090205: Enhanced Swift-XRT position
  93. GRB 090205: Swift detection of a burst
  94. GRB 080319B: IceCube upper limit on high-energy neutrino flux
  95. GRB 090202: Fermi GBM detection
  96. GRB 090131: Fermi GBM detection
  97. GRB090201: Swift UVOT upper limits
  98. GRB 090201: object inside the enhanced XRT error circle
  99. GRB 090201: Enhanced Swift-XRT position
  100. GRB 090201: VLT NIR observations

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