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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"

5164 results found.

  1. GRB 090519: Swift-XRT refined analysis
  2. GRB 090518: Swift-XRT refined analysis
  3. GRB 090516: Swift XRT refined analysis
  4. GRB 090509 - Zadko Telescope observations
  5. GRB 090510: UVOT refined analysis
  6. GRB 090510: Swift XRT refined analysis
  7. GRB 090510: Swift detection of a short hard burst
  8. GRB 090509: Swift detection of a burst
  9. GRB 090424: optical observations
  10. GRB 090429B: Swift XRT refined analysis
  11. GRB 090426: GAO 150cm telescope Optical Observation
  12. GRB 090423: millimeter detection
  13. GRB 090426: Swift-XRT refined analysis
  14. GRB 090424 : Lulin 1m telescope optical observations
  15. GRB 090424: THO optical observations
  16. GRB090423: Y-band limit
  17. GRB 090424 optical observations
  18. GRB 090424: Swift-XRT refined analysis
  19. GRB 090424: Fermi GBM Observation
  20. GRB 090423: Swift-XRT refined analysis
  21. GRB090418A Rc-band photometry
  22. GRB090423, RIMOTS optical upper limits
  23. GRB 090418A: optical observations
  24. GRB 090418A: Swift/UVOT Observations
  25. GRB 090419: Swift-XRT refined analysis
  26. VLA radio detection of GRB 090418
  27. GRB 090418: Swift XRT refined analysis
  28. GRB 090418: Swift-BAT refined analysis
  29. GRB 090418: Enhanced Swift-XRT position
  30. GRB 090418: Swift detection of a burst with optical afterglow
  31. GRB 090418 OA candidate
  32. GRB 090408b: IPN Triangulation
  33. GRB 090328b: IPN Triangulation
  34. GRB 090407: GROND upper limits
  35. GRB 090407: Swift-XRT refined analysis
  36. GRB 090404: Swift-XRT Team refined analysis
  37. GRB 090401A: Suzaku WAM observation of the prompt emission
  38. GRB 090401B: Swift XRT Refined Analysis
  39. GRB 090328: Radio afterglow detection
  40. GRB 090328B: Fermi GBM Detection
  41. GRB 090328: GROND Detection of the Optical/NIR Afterglow
  42. GRB 090323: WSRT Radio Detection
  43. GRB 090327: Fermi GBM detection
  44. GRB 090320B: MASTER-Net prompt optical observations
  45. GRB 090323: Swift-XRT refined analysis
  46. GRB 090324: SuperAGILE Localization of a Long GRB
  47. GRB 090323 Gemini-South Redshift
  48. GRB 090323: P60 Afterglow Confirmation
  49. GRB 090323: GROND Detection of the Afterglow and Photo-z
  50. SGR J1550-5418: two Fermi GBM triggers on March 22
  51. GRB 090319: Fermi GBM detection
  52. GRB 090315: Suzaku WAM observation of the prompt emission
  53. GRB 090313: MITSuME Okayama observation
  54. GRB 090309: Swift-XRT refined analysis
  55. GRB 090308: Swift-XRT refined analysis
  56. GRB 090306B: Possible XRT afterglow
  57. Swift-BAT trigger 345396 is not a GRB
  58. GRB 090306: Swift detection of a possible burst
  59. IPN localization of short bright GRB 090227B
  60. SGR J1550-5418
  61. GRB 081211B: Nearby cluster
  62. GRB 090222: Fermi GBM detection
  63. GRB 090217: Suzaku WAM observation of the prompt emission
  64. IPN localization of GRB 090217
  65. GRB 090126A: Swift-XRT Refined Analysis
  66. GRB 090123: GROND detection
  67. GRB 090123: Swift XRT refined analysis
  68. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  69. GRB 090118: KPNO 4m Detection of Candidate Afterglow
  70. GRB 090118: Swift-XRT observations
  71. GRB 090113: Swift-XRT refined analysis
  72. GRB 090111: Swift-XRT refined analysis
  73. GRB 090102: WSRT Radio Observations
  74. GRB081230: Swift-XRT refined analysis
  75. GRB 081228: Swift-XRT Team refined analysis
  76. GRB 081228: TAROT Calern observatory optical observations
  77. GRB 081224: Suzaku WAM observation of the prompt emission
  78. GRB 081224: Fermi GBM Detection & LAT Localization
  79. GRB 081222, Swift-BAT refined analysis
  80. GRB 081222: Swift XRT refined analysis
  81. GRB081221: Fermi GBM observation
  82. GRB 081221: Gemini-N nIR imaging
  83. GRB 081221: further NOT observations
  84. GRB 081221: NOT observations
  85. Modification of Swift/UVOT response to bright GRBs
  86. GRB 081216: Suzaku WAM observation of the prompt emission
  87. GRB 081211: Swift XRT refined analysis
  88. GRB 081210: Swift-XRT refined analysis
  89. Radio observation of GRB 081121 with ATCA
  90. Radio observation of GRB 081118 with ATCA
  91. GRB 081206: Fermi GBM detection
  92. Radio observation of GRB 081109 with ATCA
  93. Radio observation of GRB 081104 with ATCA
  94. Radio observation of GRB 081029 with ATCA
  95. Radio observation of GRB 081008 with ATCA
  96. GRB 081204B: Fermi GBM detection
  97. GRB 081204: Swift XRT afterglow confirmation
  98. GRB081203A: Swift-XRT refined analysis
  99. GRB 081203A: optical observations
  100. VLA Radio upper limit on GRB 081126

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