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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"

26724 results found.

  1. GRB 130408A: Suzaku WAM observation of the prompt emission
  2. GRB 130408a: Skynet Optical Observations
  3. GRB 130408A: SMARTS optical/IR afterglow observations
  4. GRB 130408A, Swift-BAT refined analysis
  5. GRB 130408A: Zadko observatory - Gingin optical observations
  6. GRB 130407A: Swift-XRT observations
  7. GRB130408A: Swift/UVOT followup observations
  8. GRB 130408A: Swift-XRT refined Analysis
  9. GRB 130408A: Enhanced Swift-XRT position
  10. GRB 130408A: GROND detection of the afterglow
  11. GRB 130408A: Liverpool Telescope Optical candidate detection
  12. GRB 130408A: Swift detection of a burst
  13. GRB 130211A: Retraction of afterglow candidate
  14. GRB 130327B: Suzaku WAM observation of the prompt emission
  15. Konus-Wind observation of GRB 130320B
  16. Swift detection of IGR J18245-2452
  17. IPN Triangulation of GRB 130320B (very long/bright)
  18. GRB 130327A: RATIR Optical/NIR afterglow confirmation
  19. GRB 130306A: Confirmation of the X-ray Afterglow
  20. GRB 130310A: RATIR Observations
  21. Swift Trigger 552142 is a noise event
  22. GRB 130327B: Fermi GBM detection
  23. Swift Trigger 552142: a possible GRB
  24. GRB 130327B: gamma-ray detection by AGILE
  25. GRB 130327A: Gemini Observations
  26. GRB 130327A: Swift-XRT refined Analysis
  27. GRB 130327A: Weihai optical obsevations
  28. GRB 130327A: Swift/UVOT Upper Limits
  29. GRB 130327A: ISON-NM optical upper limit
  30. GRB 130327A: Enhanced Swift-XRT position
  31. GRB 130327A: RATIR Optical and NIR Observations
  32. GRB 130327A: PAIRITEL NIR Afterglow Candidate
  33. GRB 130325A: Fermi LAT detection
  34. GRB 130327A: Swift detection of a burst
  35. report: GRB 130315A: Zadko observatory - Gingin optical observations
  36. GRB 130325A: Fermi GBM detection
  37. GRB 130305A: Gemini follow-up observations
  38. GRB 130315A: GROND afterglow candidate
  39. GRB 130315A: Swift/UVOT Upper Limits
  40. GRB 130313A: optical upper limit in CrAO
  41. GRB 130313A: optical upper limit in Mondy observatory
  42. GRB 130315A: SALT optical observations
  43. GRB130313A: GTC early optical limits
  44. GRB 130315A: Swift-XRT refined Analysis
  45. Swift XRT observations of GRB 130310A
  46. GRB 130315A, Swift-BAT refined analysis
  47. GRB 130313A: Swift/UVOT Upper Limits
  48. GRB130315A BOOTES-3 optical limit
  49. GRB 130315A: Swift detection of a burst
  50. GRB 130310A : Suzaku WAM observation of the prompt emission
  51. GRB 130305A: TLS Tautenburg observations
  52. GRB 130313A: RATIR Optical and NIR Observations
  53. GRB 130313A: TNG optical observations
  54. GRB130313A: Optical observations from GTC
  55. GRB 130313A: NOT optical upper limit
  56. GRB 130313A: Swift-XRT refined Analysis
  57. GRB 130313A: simultaneous and follow-up optical observations at BOOTES-3 and BOOTES-4
  58. GRB 130313A: Weihai optical upper limit
  59. GRB 130313A: Swift-XRT detection of a possible X-ray afterglow
  60. GRB 130313A: Zadko observatory - Gingin optical observations
  61. GRB 130313A: MASTER-Net optical observations
  62. GRB 130313A: Swift detection of a short burst
  63. IPN Triangulation of GRB 130307A
  64. GRB 100424A: Keck host detection and VLT/X-shooter redshift
  65. GRB 130310A: optical observations
  66. GRB 130306A: Swift Detection of a Possible Afterglow
  67. GRB 130131B: host detection and redshift
  68. GRB 130310A: Fermi GBM detection
  69. GRB 130310A: Fermi-LAT detection and localization
  70. GRB 130131A: JCMT SCUBA-2 sub-mm observations
  71. GRB 130306A: MITSuME Ishigakijima upper limits
  72. GRB 130305A BAT refined circular
  73. GRB 111123A: Keck-I host detection and VLT/X-shooter redshift
  74. GRB 130305A: Gemini-North upper limit
  75. GRB 130307A: Fermi GBM detection
  76. GRB 130305A: Swift/UVOT Upper Limit
  77. GRB 130305A: RATIR Observations
  78. GRB 130305A: P60 Observations
  79. GRB 100615A: HST host detection and X-shooter redshift
  80. GRB 130305A: Swift/XRT detection of the afterglow
  81. GRB 130305A: Fermi GBM observation
  82. GRB 130305A: Fermi LAT Detection
  83. GRB 121128A: optical upper limit in Maidanak observatory
  84. GRB 130216A: Swift/UVOT Upper Limit
  85. GRB 130219A: Suzaku WAM observation of the prompt emission
  86. Trigger 549841: Swift detection of SGR1806-20
  87. Konus-Wind observation of GRB 130219A
  88. GRB 130216B: Suzaku WAM observation of the prompt emission
  89. GRB 130216A: possible radio counterpart is steady field source
  90. GRB 130216A: Swift/XRT observations
  91. IPN Triangulation of GRB 130219A
  92. GRB 130215A: Suzaku WAM observation of the prompt emission
  93. GRB 130219A: Fermi GBM detection
  94. GRB 130216B: Swift/XRT observations
  95. GRB 130216B: MASTER-Net early observation
  96. GRB 130216A: MASTER-Net early observations
  97. GRB 130215A: Continued RATIR Optical and NIR Monitoring
  98. GRB 130216A: Fermi GBM observation
  99. GRB 130216B: Fermi GBM observation
  100. GRB 130216A: MITSuME Ishigakijima upper limits

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