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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"

43855 results found.

  1. GRB 110106B: MASTER early optical observations
  2. GRB 110107A: Swift-XRT Afterglow Candidate
  3. GRB 110107A: Swift-BAT refined analysis
  4. GRB 110107A detected in ground analysis of BAT slew data
  5. GRB 101213A: Gemini-N galaxy redshift
  6. GRB 110106B: Fermi GBM detection
  7. Short GRB 110106A: MASTER OT observations
  8. GRB 110106B: Swift-XRT refined Analysis
  9. GRB 110106B: Gemini-North / WHT detection of a fading afterglow
  10. GRB 110106A: TNG NIR observations
  11. GRB 110106B Gemini-N galaxy redshift
  12. GRB 110106B: Liverpool Telescope observations
  13. GRB 110106B: WHT candidate afterglow
  14. GRB 110106B: Swift-BAT refined analysis
  15. GRB 110106B: Enhanced Swift-XRT position
  16. GRB 110106A: Swift/UVOT Upper Limits
  17. GRB 110106A: TNG redshift of the closeby galaxy
  18. GRB 110106A: Swift-XRT refined Analysis
  19. GRB110106B: Xinglong TNT upper limit
  20. GRB 110106A: Swift-BAT refined analysis
  21. GRB 110106A: Enhanced Swift-XRT position
  22. GRB 110106B: Swift detection of a burst
  23. GRB 110106A: TNG optical observations and candidate counterparts
  24. GRB 110106A: MASTER optical observations
  25. GRB 101225A: Keck redshift
  26. GRB110106A: Xinglong TNT upper limit
  27. GRB 110106A: Swift detection of a burst
  28. GRB 101225A: Host galaxy
  29. GRB 101219A: Gemini-North host redshift
  30. GRB 110102A: Swift-XRT refined Analysis
  31. GRB 101219B: After 2 weeks still detected by Swift/UVOT
  32. Konus-Wind observation of GRB 110102A
  33. GRB110102A: Swift/UVOT observations
  34. GRB 110102A: Fermi GBM observation
  35. GRB 110102A: Swift-BAT refined analysis
  36. GRB 110102A: Enhanced Swift-XRT position
  37. GRB 110102A: Swift detection of a burst with an optical detection
  38. GRB 101225A: optical break from NOT observation
  39. GRB 101225A: MMT spectroscopy
  40. GRB 101225A: P60 Observations
  41. GRB 101225A: MAXI/GSC observations
  42. GRB 101225A Late-time emission observed by Swift-BAT
  43. GRB 101225: Optical follow-up of the Christmas burst
  44. GRB 101225A: WHT observations
  45. Tentative redshift of GRB101225A (Christmas's burst) from Swift-XRT data
  46. GRB 101225A, Swift-BAT refined analysis
  47. GRB 101225A: Swift/UVOT Detection
  48. GRB 101225A: Swift-XRT refined Analysis
  49. GRB 101225A: Enhanced Swift-XRT position
  50. Trigger 441015 / GRB 101225A: Further NOT optical observation
  51. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  52. GRB 101225A (Swift trigger 441015): optical upper limit
  53. Trigger 441015: Swift detection of a possible burst or transient
  54. GRB 101224A: NOT optical observation
  55. GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle
  56. GRB 101224A: Fermi GBM observation
  57. GRB 101224A: Swift-XRT refined Analysis
  58. GRB 101224A, Swift-BAT refined analysis
  59. GRB 101224A - UVOT-enhanced XRT position
  60. GRB 101224A: Swift detection of a short burst
  61. GRB 101219A: Chandra Observations
  62. GRB 101219B: Swift/UVOT refined analysis
  63. GRB 101219B: Swift-XRT refined Analysis
  64. GRB 101219B: Enhanced Swift-XRT position
  65. GRB 101219B: GROND Detection of the Optical/NIR Afterglow
  66. GRB 101219B: Fermi GBM observation
  67. GRB 101219A: IAC80 optical observations
  68. GRB 101219B: Swift-BAT refined analysis
  69. GRB 101219A: Swift-XRT refined Analysis
  70. GRB 101219B: Swift detection of a burst with an optical afterglow
  71. GRB 101219A: GROND Upper limits
  72. Konus-Wind observation of short hard GRB 101219A
  73. GRB 101219A: Magellan NIR observations
  74. GRB 101219A: Further Gemini-South Imaging
  75. GRB 101219A: Swift-BAT refined analysis
  76. GRB 101219A - NOT observation - upper limit
  77. GRB 101219A: SARA-N Upper Limit
  78. GRB 101219A: Gemini-South observations
  79. GRB 101219A: REM optical and NIR observations
  80. GRB 101219A: ROTSE-III Optical Limits
  81. GRB 101219A: Swift detection of a short hard burst
  82. Request for Supernova related data for GRB 101023A
  83. GRB 101213A : Suzaku WAM observation of the prompt emission
  84. Redshift solution(s) for GRB101213A from Swift-XRT data
  85. Konus-Wind observation of GRB 101213A
  86. XRF 101117A, RIMOTS optical upper limits
  87. GRB 101213A: Fermi GBM observation
  88. GRB 101213A, Swift-BAT refined analysis
  89. GRB 101213A: Swift-XRT refined Analysis
  90. GRB 101213A: Enhanced Swift-XRT position
  91. GRB 101213: object within the X-ray error circle
  92. GRB 101213A: Swift detection of a burst
  93. GRB101204A: Swift/UVOT observations
  94. GRB 101204A: Swift-XRT refined Analysis
  95. GRB101204A GROND Detection of the Optical/NIR Afterglow
  96. GRB 101204A Afterglow Candidate, VATT Observations
  97. GRB 101129A : Suzaku WAM observation of the prompt emission
  98. GRB 101204A Swift-XRT/UVOT afterglow candidate
  99. Konus-Wind observation of GRB 101130A
  100. GRB 101204A detected in ground analysis of BAT data

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