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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"

21264 results found.

  1. GRB 090407: VLT observations
  2. GRB 090407: Swift UVOT Upper Limits
  3. GRB 090407: Enhanced Swift-XRT position
  4. Konus-Wind and Konus-RF observations of GRB 090406
  5. GRB 090407: ROTSE-III Optical Limits
  6. GRB 090407: Swift detection of a burst
  7. GRB 090404: GROND upper limits
  8. GRB 090404: further NOT observations
  9. Swift/UVOT observations of GRB090404
  10. GRB 090404: NOT observations
  11. GRB 090404: Enhanced Swift-XRT position
  12. GRB 090404: Swift detection of a burst
  13. GRB 090401A: Suzaku WAM observation of the prompt emission
  14. GRB 090401B: Suzaku WAM observation of the prompt emission
  15. Konus-Wind observation of GRB 090401B
  16. GRB 090401B: VLA radio upper limit
  17. GRB 090401B: Upper limits of MITSuME optical observation
  18. GRB090401B, RIMOTS optical upper limits
  19. GRB 090401B: AGILE refined analysis
  20. Konus-Wind observation of GRB 090401A
  21. GRB 090401B: Enhanced Swift-XRT position
  22. AGILE Gamma-ray detection of GRB 090401B
  23. GRB 090401B: Swift-BAT refined analysis
  24. GRB 090401B: Swift detection of a burst
  25. GRB 090328B: MASTER-Irkutsk prompt optical short burst observations
  26. GRB 090401, Swift-BAT refined analysis
  27. GRB 090324: Suzaku WAM observation of the prompt emission
  28. GRB 090328: Radio afterglow detection
  29. GRB 090328: Fermi GBM Spectral Analysis
  30. GRB 090328B: Fermi GBM Detection
  31. GRB 090328: GROND Detection of the Optical/NIR Afterglow
  32. GRB090323: Optical observations from NOT
  33. Konus-Wind observation of GRB 090328
  34. GRB 090328: Swift UVOT observations
  35. GRB 090328: Updated position/optical afterglow candidate
  36. Fermi LAT and GBM detections of GRB090328
  37. GRB 090323: Radio afterglow detection
  38. GRB 090323: TLS detection at 5 days, no break
  39. GRB 090320B: MASTER-Net prompt optical observations
  40. GRB 090323: Lick observations
  41. GRB 090323: Fermi GBM Spectral Analysis
  42. GRB 090323: UVOT Detection of Afterglow
  43. GRB 090323: P60 Afterglow Confirmation
  44. GRB 090323: GROND Detection of the Afterglow and Photo-z
  45. GRB 090323: Possible XRT Counterpart
  46. Fermi GBM and LAT detections of GRB 090323
  47. Further 15GHz observations of GRB090313
  48. X-shooter observations of GRB 090313
  49. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  50. GRB 090315: Suzaku WAM observation of the prompt emission
  51. GRB090313: radio detection with the VLA
  52. Konus-Wind observation of GRB 090315
  53. IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
  54. Further radio observation of GRB 090313
  55. GRB 090313: detection with CARMA in 3mm band
  56. GRB090305B: MASTER-net prompt optical short burst observations
  57. GRB 090313: MITSuME Okayama observation
  58. GRB 090313: Additional Gemini-S photometry
  59. GRB 090313: TAROT La Silla observatory optical detection
  60. GRB 090313: Zadko Telescope observations
  61. GRB 090313: Ongoing plateau phase
  62. GRB 090313: Swift-XRT refined analysis
  63. GRB 090313: Swift/UVOT upper limits
  64. GRB 090313, GROND observations
  65. Swift trigger 346250 is probably not a burst
  66. GRB 090205: Zadko Telescope late-time observations
  67. GRB 090309A: GROND upper limits
  68. GRB 090307A: TAROT Calern observatory optical observations
  69. GRB 090309: Swift/UVOT Upper Limits
  70. GRB 090309: Enhanced Swift-XRT position
  71. GRB 090308: GROND observations
  72. GRB 090308: Gemini GMOS Observations
  73. GRB 090309: Swift detection of a burst
  74. GRB 090308: Swift/UVOT Upper Limits
  75. GRB 090307B: Fermi GBM detection
  76. GRB 090307: GROND Upper Limits
  77. GRB 090306B: GROND Upper Limits
  78. GRB 090305C: Suzaku WAM observation of the prompt emission
  79. GRB 090308: Swift-XRT refined analysis
  80. GRB 090308: Swift detection of a burst
  81. GRB 090306B: Possible XRT afterglow
  82. GRB 090307: Swift-XRT afterglow confirmation and analysis
  83. Swift Trigger 345551 is probably not a GRB
  84. IPN localization of short GRB 090305C
  85. GRB 090306: Swift detection of a possible burst
  86. GRB 090305: Swift/UVOT Upper Limits
  87. GRB 090305: Swift-XRT refined analysis
  88. GRB 090227A: Suzaku WAM observation of the prompt emission
  89. GRB 090305: Magellan confirmation of the optical afterglow
  90. GRB090305: GMOS-S Candidate Optical Afterglow
  91. GRB 090305: Swift detection of a short burst
  92. GRB 090301A: Suzaku WAM observation of the prompt emission
  93. Konus-Wind observation of bright short GRB 090227B
  94. Konus-Wind observation of GRB 090301A
  95. GRB 090301A: Swift-BAT refined analysis
  96. GRB 090301B: Fermi GBM detection
  97. GRB 081211B: Nearby cluster
  98. Ongoing activity of AXP/SGR 1E1547.0-5408
  99. GRB 090217: Suzaku WAM observation of the prompt emission
  100. GRB090217: XRT analysis

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