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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"

36039 results found.

  1. GRB 101225A, Swift-BAT refined analysis
  2. GRB 101225A: Swift/UVOT Detection
  3. GRB 101225A: Swift-XRT refined Analysis
  4. GRB 101225A: Enhanced Swift-XRT position
  5. Trigger 441015 / GRB 101225A: Further NOT optical observation
  6. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  7. GRB 101225A (Swift trigger 441015): optical upper limit
  8. Trigger 441015: Swift detection of a possible burst or transient
  9. GRB 101224A: NOT optical observation
  10. GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle
  11. GRB 101224A: Swift/UVOT Upper Limits
  12. GRB 101224A: Fermi GBM observation
  13. GRB 101224A: Swift-XRT refined Analysis
  14. GRB101224A: MITSuME Okayama optical upper limits
  15. GRB 101224A, Swift-BAT refined analysis
  16. GRB 101224A - UVOT-enhanced XRT position
  17. GRB 101224A: Swift detection of a short burst
  18. GRB 101219A: Chandra Observations
  19. GRB 101219B: Swift/UVOT refined analysis
  20. GRB 101219B: Swift-XRT refined Analysis
  21. GRB 101219B: Enhanced Swift-XRT position
  22. GRB 101219A: MITSuME Ishigakijima Optical upper limits
  23. GRB 101219B: GROND Detection of the Optical/NIR Afterglow
  24. GRB 101219B: Fermi GBM observation
  25. GRB 101219A: IAC80 optical observations
  26. GRB 101219B: Swift-BAT refined analysis
  27. GRB 101219A: Swift-XRT refined Analysis
  28. GRB 101219B: Swift detection of a burst with an optical afterglow
  29. GRB 101219A: Swift/UVOT Upper Limits
  30. GRB 101219A: GROND Upper limits
  31. Konus-Wind observation of short hard GRB 101219A
  32. GRB 101219A: Magellan NIR observations
  33. GRB 101219A: Further Gemini-South Imaging
  34. GRB 101219A: Swift-BAT refined analysis
  35. GRB 101219A - NOT observation - upper limit
  36. GRB 101219A: SARA-N Upper Limit
  37. GRB 101219A: Gemini-South observations
  38. GRB 101219A: REM optical and NIR observations
  39. GRB 101219A: ROTSE-III Optical Limits
  40. GRB 101219A: Swift detection of a short hard burst
  41. Request for Supernova related data for GRB 101023A
  42. GRB 101213A : Suzaku WAM observation of the prompt emission
  43. Redshift solution(s) for GRB101213A from Swift-XRT data
  44. Konus-Wind observation of GRB 101213A
  45. GRB 101213A: Fermi GBM observation
  46. GRB 101213A, Swift-BAT refined analysis
  47. GRB 101213A: Swift-XRT refined Analysis
  48. GRB 101213A: Swift/UVOT Upper Limits
  49. GRB 101213A: Enhanced Swift-XRT position
  50. GRB 101213: object within the X-ray error circle
  51. GRB 101213A: Swift detection of a burst
  52. GRB101204A: Swift/UVOT observations
  53. GRB 101204A: Swift-XRT refined Analysis
  54. GRB101204A GROND Detection of the Optical/NIR Afterglow
  55. GRB 101204A Afterglow Candidate, VATT Observations
  56. GRB 101129A : Suzaku WAM observation of the prompt emission
  57. GRB 101204A Swift-XRT/UVOT afterglow candidate
  58. Konus-Wind observation of GRB 101130A
  59. GRB 101204A detected in ground analysis of BAT data
  60. Konus-Wind observation of GRB 101129A
  61. IPN Localization of GRB101130 (possible short duration burst)
  62. GRB 101129A SHB found by IPN and in ground analysis of BAT data
  63. GRB101030A
  64. GRB 101201A: Fermi GBM observation
  65. GRB 101201A: Swift-XRT refined Analysis
  66. GRB 101201A: Swift/UVOT Detection
  67. GRB 101201A: GROND Detection of the Optical/NIR Afterglow
  68. GRB 101201A detected in ground analysis of BAT data
  69. GRB 101123A: ROTSE optical observations
  70. GRB 101123A: MASTER prompt optical observations
  71. Konus-Wind observation of GRB 101123A
  72. IPN triangulation of bright GRB 101123A
  73. GRB 101123A: Fermi GBM detection
  74. Optical observation of GRB 101024A
  75. GRB 101117B: GROND Upper limits
  76. GRB 101117B: Swift/UVOT Observations of the Optical Afterglow
  77. GRB 101112A: OSN and BTA observations
  78. GRB 101117B: Swift-XRT refined analysis
  79. GRB101114A: Swift/UVOT Upper Limits
  80. GRB 101114A: Confirmation of the X-ray afterglow
  81. GRB 101117B: Swift-BAT refined analysis
  82. GRB 101117B: Enhanced Swift-XRT position
  83. GRB 101117B: Swift/UVOT Discovery of an Optical Afterglow
  84. GRB 101117B: Swift detection of a burst
  85. GRB 101114A: GROND Upper limits
  86. Konus-Wind observation of GRB 101114A
  87. GRB 101114A: Swift-XRT candidate afterglow detection and analysis
  88. GRB 101114A, Swift-BAT GRB detected by ground processing
  89. Possible detection of INTEGRAL burst GRB 101112A by the EVLA
  90. GRB 101112A: Fermi GBM detection
  91. GRB 101112A: optical observations
  92. GRB 10112A: MASTER optical observations
  93. Konus-Wind observation of GRB 101112A
  94. GRB 101112A - XRT source detection/analysis
  95. GRB 101112A: BOOTES-2/TELMA optical afterglow candidate
  96. GRB101112A: Liverpool Telescope Afterglow Candidate
  97. GRB 101112A: a long GRB detected by INTEGRAL
  98. GRB 100906A: optical observations
  99. GRB 090113, the review of the sky area in plate archives
  100. GRB 101030A : MOA optical observation

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