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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"

37580 results found.

  1. GRB 110102A: Swift-BAT refined analysis
  2. GRB 110102A: Enhanced Swift-XRT position
  3. GRB 110102A: Swift detection of a burst with an optical detection
  4. GRB 101225A: optical break from NOT observation
  5. GRB 101225A: MMT spectroscopy
  6. GRB 101225A: P60 Observations
  7. GRB 101225A: MAXI/GSC observations
  8. GRB 101225A Late-time emission observed by Swift-BAT
  9. GRB 101225: Optical follow-up of the Christmas burst
  10. GRB 101225A: WHT observations
  11. Tentative redshift of GRB101225A (Christmas's burst) from Swift-XRT data
  12. GRB 101225A, Swift-BAT refined analysis
  13. GRB 101225A: Swift/UVOT Detection
  14. GRB 101225A: Swift-XRT refined Analysis
  15. GRB 101225A: Enhanced Swift-XRT position
  16. Trigger 441015 / GRB 101225A: Further NOT optical observation
  17. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  18. GRB 101225A (Swift trigger 441015): optical upper limit
  19. Trigger 441015: Swift detection of a possible burst or transient
  20. GRB 101224A: NOT optical observation
  21. GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle
  22. GRB 101224A: Swift/UVOT Upper Limits
  23. GRB 101224A: Fermi GBM observation
  24. GRB 101224A: Swift-XRT refined Analysis
  25. GRB101224A: MITSuME Okayama optical upper limits
  26. GRB 101224A, Swift-BAT refined analysis
  27. GRB 101224A - UVOT-enhanced XRT position
  28. GRB 101224A: Swift detection of a short burst
  29. GRB 101219A: Chandra Observations
  30. GRB 101219B: Swift/UVOT refined analysis
  31. GRB 101219B: Swift-XRT refined Analysis
  32. GRB 101219B: Enhanced Swift-XRT position
  33. GRB 101219A: MITSuME Ishigakijima Optical upper limits
  34. GRB 101219B: GROND Detection of the Optical/NIR Afterglow
  35. GRB 101219B: Fermi GBM observation
  36. GRB 101219A: IAC80 optical observations
  37. GRB 101219B: Swift-BAT refined analysis
  38. GRB 101219A: Swift-XRT refined Analysis
  39. GRB 101219B: Swift detection of a burst with an optical afterglow
  40. GRB 101219A: Swift/UVOT Upper Limits
  41. GRB 101219A: GROND Upper limits
  42. Konus-Wind observation of short hard GRB 101219A
  43. GRB 101219A: Magellan NIR observations
  44. GRB 101219A: Further Gemini-South Imaging
  45. GRB 101219A: Swift-BAT refined analysis
  46. GRB 101219A - NOT observation - upper limit
  47. GRB 101219A: SARA-N Upper Limit
  48. GRB 101219A: Gemini-South observations
  49. GRB 101219A: REM optical and NIR observations
  50. GRB 101219A: ROTSE-III Optical Limits
  51. GRB 101219A: Swift detection of a short hard burst
  52. Request for Supernova related data for GRB 101023A
  53. GRB 101213A : Suzaku WAM observation of the prompt emission
  54. Redshift solution(s) for GRB101213A from Swift-XRT data
  55. Konus-Wind observation of GRB 101213A
  56. GRB 101213A: Fermi GBM observation
  57. GRB 101213A, Swift-BAT refined analysis
  58. GRB 101213A: Swift-XRT refined Analysis
  59. GRB 101213A: Swift/UVOT Upper Limits
  60. GRB 101213A: Enhanced Swift-XRT position
  61. GRB 101213: object within the X-ray error circle
  62. GRB 101213A: Swift detection of a burst
  63. GRB101204A: Swift/UVOT observations
  64. GRB 101204A: Swift-XRT refined Analysis
  65. GRB101204A GROND Detection of the Optical/NIR Afterglow
  66. GRB 101204A Afterglow Candidate, VATT Observations
  67. GRB 101129A : Suzaku WAM observation of the prompt emission
  68. GRB 101204A Swift-XRT/UVOT afterglow candidate
  69. Konus-Wind observation of GRB 101130A
  70. GRB 101204A detected in ground analysis of BAT data
  71. Konus-Wind observation of GRB 101129A
  72. IPN Localization of GRB101130 (possible short duration burst)
  73. GRB 101129A SHB found by IPN and in ground analysis of BAT data
  74. GRB101030A
  75. GRB 101201A: Fermi GBM observation
  76. GRB 101201A: Swift-XRT refined Analysis
  77. GRB 101201A: Swift/UVOT Detection
  78. GRB 101201A: GROND Detection of the Optical/NIR Afterglow
  79. GRB 101201A detected in ground analysis of BAT data
  80. GRB 101123A: ROTSE optical observations
  81. GRB 101123A: MASTER prompt optical observations
  82. Konus-Wind observation of GRB 101123A
  83. IPN triangulation of bright GRB 101123A
  84. GRB 101123A: Fermi GBM detection
  85. Optical observation of GRB 101024A
  86. GRB 101117B: GROND Upper limits
  87. GRB 101117B: Swift/UVOT Observations of the Optical Afterglow
  88. GRB 101112A: OSN and BTA observations
  89. GRB 101117B: Swift-XRT refined analysis
  90. GRB101114A: Swift/UVOT Upper Limits
  91. GRB 101114A: Confirmation of the X-ray afterglow
  92. GRB 101117B: Swift-BAT refined analysis
  93. GRB 101117B: Enhanced Swift-XRT position
  94. GRB 101117B: Swift/UVOT Discovery of an Optical Afterglow
  95. GRB 101117B: Swift detection of a burst
  96. GRB 101114A: GROND Upper limits
  97. Konus-Wind observation of GRB 101114A
  98. Fermi GBM detection of a burst from a galactic source
  99. GRB 101114A: Swift-XRT candidate afterglow detection and analysis
  100. GRB 101114A, Swift-BAT GRB detected by ground processing

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