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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"

26232 results found.

  1. Trigger 510075 is not a GRB
  2. GRB111215A: CARMA Detection
  3. GRB 111215B: Suzaku WAM observation of the prompt emission
  4. GRB 111215B: Swift/UVOT Upper Limits
  5. GRB 111215B: Swift-XRT observations
  6. GRB 111215A: TNG K-band observations
  7. GRB 111215A: Swift/UVOT Upper Limits
  8. GRB 111215A: Swift-XRT refined Analysis
  9. Possible detection of pre-trigger X-ray emission from GRB 111215A by MAXI/GSC
  10. GRB 111215A: Swift-BAT refined analysis
  11. GRB 111215A: MASTER-Net optical prompt and follow up observations
  12. GRB 111215A: MITSuME Akeno Optical upper limits
  13. GRB 111215A: GMG optical upper limit
  14. GRB 111215A: Swift detection of a burst
  15. GRB 111212A: GROND observations
  16. GRB 111211A: Swift/UVOT Detection
  17. GRB 111211A: NOT afterglow confirmation
  18. GRB 111212A: Swift-XRT refined Analysis
  19. GRB 111211A: Swift/XRT target of opportunity observation
  20. GRB 111212A: Swift/UVOT Upper Limits
  21. GRB 111212A: Swift-BAT refined analysis
  22. GRB 111212A: Swift-XRT observations
  23. GRB 111212A: Swift detection of a burst
  24. Konus-Wind observation of GRB 111209A
  25. GRB 111210A: GROND observations
  26. GRB 111210A: Swift-XRT refined Analysis
  27. GRB 111209A: Rebrightening seen by GROND
  28. GRB111210A: MITSuME Okayama J-band upper-limit
  29. GRB 111210A: Swift/UVOT Upper Limits
  30. GRB 111210A: Swift-BAT refined analysis
  31. GRB 111210A: Swift detection of a burst
  32. GRB 111209A: GROND Afterglow observations
  33. GRB 111209A optical limit by "Pi of the Sky"
  34. GRB 111208A: Lightbuckets Optical Observations
  35. GRB 111209A: Swift-XRT refined Analysis
  36. GRB 111209A: Swift UVOT refined analysis
  37. GRB 111209A: Swift Burst of Interest
  38. GRB 111209A, Swift-BAT refined analysis
  39. GRB111209A : planned XMM-Newton observation
  40. GRB 111209A: TAROT La Silla observatory optical light curve analysis
  41. GRB 111205A: GROND observations
  42. GRB 111209A: Faulkes Telescope North observations
  43. GRB 111209A: TAROT La Silla observatory optical detection
  44. GRB 111209A: Swift detection of a long burst with an optical counterpart
  45. GRB 111208A: Swift XRT/UVOT observations
  46. GRB 111205A: Swift XRT Observations
  47. GRB 111207A found in ground analysis of BAT data
  48. GRB 111208A found in ground analysis of BAT data
  49. GRB 111204A: GROND Observations
  50. GRB 111204A: Swift-XRT refined Analysis
  51. GRB 111204A, Swift-BAT refined analysis
  52. GRB 111204A: Swift/UVOT Upper Limits
  53. GRB 111204A: MASTER optical observations
  54. GRB 111204A: Swift detection of a burst
  55. GRB 111201A: Confirmation of the X-ray afterglow
  56. GRB 111201A: Swift/UVOT Upper Limits
  57. GRB111201A: Swift-XRT observations
  58. GRB 111201A found in ground analysis of BAT data
  59. GRB 111121A: Suzaku WAM observation of the prompt emission
  60. GRB 111129A: Swift/UVOT Detection
  61. GRB 111129A, GROND afterglow observations
  62. GRB 111129A: Swift-XRT refined Analysis
  63. GRB 111129A: Swift-BAT refined analysis
  64. GRB 111129A: Swift detection of a burst with an optical counterpart
  65. GRB 111123A, Swift-BAT refined analysis
  66. GRB 111123A: Swift/UVOT Upper Limits
  67. GRB 111123A - NOT optical observations
  68. GRB 111123A: Swift-XRT refined Analysis
  69. GRB 111123A: Swift detection of a burst
  70. Konus-Wind observation of GRB 111121A
  71. GRB 111121A: Swift/UVOT Upper Limits
  72. GRB 111121A: Swift-XRT refined Analysis
  73. GRB 111121A: Swift-BAT refined analysis
  74. GRB 111117A: Chandra detection of the afterglow
  75. GRB 111121A: Swift detection of a short hard burst
  76. GRB 111117A: Gemini Afterglow Limits
  77. GRB 111117A: optical upper limit in CrAO
  78. GRB 111117A: Fermi GBM observation
  79. GRB 111117A: Swift/UVOT Upper Limits
  80. GRB 111117A: GROND observations
  81. GRB 111117A: Swift-XRT refined Analysis
  82. GRB111107A: Further ATCA observations - no detection
  83. GRB 111117A: NOT observations
  84. GRB 111117A: Swift-BAT refined analysis of a short hard burst
  85. GRB 111117A: Swift detection of a short hard burst
  86. GRB111107A: ATCA observations - upper limit and a possible detection
  87. GRB 111109A: Swift-XRT refined Analysis
  88. GRB 111109A: Swift/UVOT Photometry
  89. GRB 111109A: Swift-BAT refined analysis
  90. GRB 111109A: Swift-XRT observations
  91. GRB 111109A: Swift detection of a burst
  92. GRB 111107A: Fermi GBM observation
  93. Continued Skynet observations of GRB111107A
  94. GRB 111107A: Swift-XRT refined Analysis
  95. GRB 111107A: Swift/UVOT Afterglow Analysis
  96. GRB 111107A: Swift-BAT refined analysis
  97. GRB 111107A: Gemini-South Redshift
  98. GRB 111107A: GROND observations
  99. Skynet observations of GRB 111107A
  100. GRB 111107A: Swift detection of a burst with an optical counterpart

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