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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"

25840 results found.

  1. GRB 090815: Fermi GBM detection
  2. GRB 090813: CrAO optical obsevations
  3. GRB090814A: NOT optical follow-ups
  4. GRB 090814B: I-band observations from 1.23m CAHA telescope
  5. GRB 090814B: Swift/UVOT Upper Limits
  6. GRB 090814B: Liverpool Telescope Observations
  7. GRB 090814C: Fermi GBM detection
  8. GRB 090814B: Swift-XRT detection of a possible afterglow.
  9. GRB 090814A: Swift/UVOT Observations
  10. GRB 090814A: Swift-XRT Team Refined Analysis
  11. GRB 090814A, RIMOTS optical upper limits
  12. GRB090814A: VLT spectroscopy
  13. GRB 090814: Enhanced Swift-XRT position
  14. GRB 090814: GROND Detection of an Optical Afterglow Candidate
  15. GRB 090814: Swift detection of a burst
  16. GRB 090813: Fermi GBM observation
  17. GRB 090813: Swift-XRT refined analysis
  18. Konus-Wind observations of GRB090813
  19. GRB090813: Swift/UVOT upper limits
  20. GRB 090813: Enhanced Swift-XRT position
  21. GRB 090813: Liverpool Telescope afterglow confirmation
  22. GRB 090813: P60 Optical Afterglow Confirmation
  23. GRB 090813: Swift detection of a burst
  24. GRB 090812: WIRO NIR upper limit
  25. GRB 090812: Faulkes Telescope South Continued Optical Monitoring
  26. GRB 090812: RAPTOR detections during the burst
  27. GRB 090812: Swift XRT refined analysis
  28. GRB 090812, RIMOTS optical upper limits
  29. GRB090812: Swift/UVOT observations
  30. GRB 090812: GROND Observations of the Optical/NIR Afterglow
  31. GRB 090812: Enhanced Swift-XRT position
  32. GRB 090812: Liverpool Telescope afterglow confirmation
  33. GRB 090812: P60 Confirmation of Optical Afterglow
  34. GRB 090812: Swift detection of a burst with an optical counterpart
  35. GRB 090807B: Fermi GBM detection
  36. GRB 090809: Further NOT optical observations
  37. VLA radio upper limit on GRB 090809
  38. GRB 090621B: MAGIC telescope GeV observation
  39. GRB 090621A: MAGIC telescope GeV observation
  40. GRB 090809: WHT observations
  41. GRB 090809B: Fermi GBM detection
  42. GRB 090809: Swift-XRT refined analysis
  43. GRB090809: Swift/UVOT observations
  44. GRB 090809: Enhanced Swift-XRT position
  45. GRB 090809: afterglow confirmation at the NOT
  46. GRB 090809: Swift detection of a burst with a possible optical counterpart
  47. GRB 090807: Liverpool Telescope observations
  48. GRB 090807: MITSuME optical upper limit
  49. GRB 090807: Swift/UVOT Upper Limits
  50. GRB 090807: Swift-XRT refined analysis
  51. GRB 090807: Enhanced Swift-XRT position
  52. GRB 090807, RIMOTS optical upper limits
  53. GRB 090807: Swift detection of a burst
  54. GRB 090802B: Fermi GBM detection
  55. IPN Triangulation and Konus-Wind observaions of GRB090727B
  56. GRB 090802: Fermi GBM detection
  57. GRB 090726: optical observation
  58. Swift trigger 358760 is probably a noise event
  59. GRB 090717A: Suzaku WAM observation of the prompt emission
  60. GRB 090709A : Quick look analysis of the Suzaku observation
  61. GRB 090728: Swift-BAT refined analysis
  62. GRB 090727: GRT Optical Observation
  63. GRB 090728: Swift XRT refined analysis
  64. GRB 090726: GRT Optical Observation
  65. GRB 090727: Swift/UVOT Upper Limits
  66. GRB 090728: Swift/UVOT Upper Limits
  67. GRB 090728: Enhanced Swift-XRT position
  68. GRB 090728, RIMOTS optical upper limits
  69. GRB 090728A: Faulkes Telescope North Optical Afterglow Candidate
  70. GRB 090728: Swift detection of a burst
  71. GRB 090727: Swift-XRT refined analysis
  72. GRB 090727: Enhanced Swift-XRT position
  73. GRB 090715B: Late-time Lick 3m observations
  74. GRB 090727: Liverpool Telescope possible OT candidate
  75. GRB 090727: Swift detection of a burst
  76. GRB090726: Swift/UVOT observations
  77. GRB 090726: D50 optical observations
  78. GRB 090711: Fermi GBM detection
  79. GRB 090726: Swift-XRT Team refined analysis
  80. GRB 090726: Enhanced Swift-XRT position
  81. GRB 090726: optical transient candidate
  82. Konus-Wind and Konus-RF observations of GRB 090719
  83. Konus-Wind observations of bright hard GRB 090720B
  84. IPN Triangulation of bright GRB 090720B
  85. GRB 090720B: Fermi GBM detection
  86. Swift XRT and UVOT refned analysis of GRB 090720
  87. GRB 090709A: Swift XRT Timing Analysis
  88. GRB 090715B: VLA radio detection
  89. GRB 090720 Source found in ground processing of Swift-BAT data
  90. GRB 090717B: Fermi GBM detection
  91. GRB 090717: Fermi GBM detection
  92. GRB 090719: Fermi GBM detection
  93. GRB 090718B: Fermi GBM detection
  94. GRB 090718: Fermi GBM detection
  95. GRB 090720: Fermi GBM detection
  96. GRB 090715B: further NOT optical observations
  97. GRB 090715A: Suzaku WAM observation of the prompt emission
  98. GRB 090709A - CARMA mm Observations
  99. GRB 090715A: VLA observations
  100. Konus-Wind observations of short/hard GRB 090715A

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