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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"

28126 results found.

  1. GRB 110106B: Swift-BAT refined analysis
  2. GRB 110106B: Enhanced Swift-XRT position
  3. GRB 110106A: Swift/UVOT Upper Limits
  4. GRB 110106A: TNG redshift of the closeby galaxy
  5. GRB 110106A: Swift-XRT refined Analysis
  6. GRB 110106A: Swift-BAT refined analysis
  7. GRB 110106A: Enhanced Swift-XRT position
  8. GRB 110106B: Swift detection of a burst
  9. GRB 110106A: TNG optical observations and candidate counterparts
  10. GRB 110106A: Swift detection of a burst
  11. GRB 101225A: Host galaxy
  12. GRB 110102A: Swift-XRT refined Analysis
  13. GRB110102A: Swift/UVOT observations
  14. GRB110102A: MITSuME Okayama Optical Observation
  15. GRB 110102A: Fermi GBM observation
  16. GRB 110102A: Swift-BAT refined analysis
  17. GRB 110102A: Enhanced Swift-XRT position
  18. GRB 110102A: Swift detection of a burst with an optical detection
  19. GRB 101225A: optical break from NOT observation
  20. GRB 101225A: P60 Observations
  21. GRB 101225A: MAXI/GSC observations
  22. GRB 101225A Late-time emission observed by Swift-BAT
  23. Tentative redshift of GRB101225A (Christmas's burst) from Swift-XRT data
  24. GRB 101225A, Swift-BAT refined analysis
  25. GRB 101225A: Swift/UVOT Detection
  26. GRB 101225A: Swift-XRT refined Analysis
  27. GRB 101225A: Enhanced Swift-XRT position
  28. Trigger 441015 / GRB 101225A: Further NOT optical observation
  29. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  30. GRB 101225A (Swift trigger 441015): optical upper limit
  31. Trigger 441015: Swift detection of a possible burst or transient
  32. GRB 101224A: NOT optical observation
  33. GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle
  34. GRB 101224A: Swift/UVOT Upper Limits
  35. GRB 101224A: Swift-XRT refined Analysis
  36. GRB101224A: MITSuME Okayama optical upper limits
  37. GRB 101224A, Swift-BAT refined analysis
  38. GRB 101224A - UVOT-enhanced XRT position
  39. GRB 101224A: Swift detection of a short burst
  40. GRB 101219A: Chandra Observations
  41. GRB 101219B: Swift/UVOT refined analysis
  42. GRB 101219B: Swift-XRT refined Analysis
  43. GRB 101219B: Enhanced Swift-XRT position
  44. GRB 101219A: MITSuME Ishigakijima Optical upper limits
  45. GRB 101219B: GROND Detection of the Optical/NIR Afterglow
  46. GRB 101219B: Fermi GBM observation
  47. GRB 101219A: IAC80 optical observations
  48. GRB 101219B: Swift-BAT refined analysis
  49. GRB 101219A: Swift-XRT refined Analysis
  50. GRB 101219B: Swift detection of a burst with an optical afterglow
  51. GRB 101219A: Swift/UVOT Upper Limits
  52. GRB 101219A: GROND Upper limits
  53. GRB 101219A: Magellan NIR observations
  54. GRB 101219A: Further Gemini-South Imaging
  55. GRB 101219A: Swift-BAT refined analysis
  56. GRB 101219A - NOT observation - upper limit
  57. GRB 101219A: SARA-N Upper Limit
  58. GRB 101219A: REM optical and NIR observations
  59. GRB 101219A: Swift detection of a short hard burst
  60. GRB 101213A : Suzaku WAM observation of the prompt emission
  61. Redshift solution(s) for GRB101213A from Swift-XRT data
  62. XRF 101117A, RIMOTS optical upper limits
  63. GRB 101213A: Fermi GBM observation
  64. GRB 101213A, Swift-BAT refined analysis
  65. GRB 101213A: Swift-XRT refined Analysis
  66. GRB 101213A: Swift/UVOT Upper Limits
  67. GRB 101213A: Enhanced Swift-XRT position
  68. GRB 101213: object within the X-ray error circle
  69. GRB 101213A: Swift detection of a burst
  70. GRB101204A: Swift/UVOT observations
  71. GRB 101204A: Swift-XRT refined Analysis
  72. GRB101204A GROND Detection of the Optical/NIR Afterglow
  73. GRB 101204A Afterglow Candidate, VATT Observations
  74. GRB 101129A : Suzaku WAM observation of the prompt emission
  75. GRB 101204A Swift-XRT/UVOT afterglow candidate
  76. Konus-Wind observation of GRB 101130A
  77. GRB101030A
  78. GRB 101201A: Fermi GBM observation
  79. GRB 101201A: Swift-XRT refined Analysis
  80. GRB 101201A: Swift/UVOT Detection
  81. GRB 101201A: GROND Detection of the Optical/NIR Afterglow
  82. GRB 101123A: ROTSE optical observations
  83. GRB 101123A: MASTER prompt optical observations
  84. GRB 101123A: Fermi GBM detection
  85. GRB 101117B: GROND Upper limits
  86. GRB 101117B: Swift/UVOT Observations of the Optical Afterglow
  87. GRB 101112A: OSN and BTA observations
  88. XRF 101117A: Palomar Transient Factory Observations
  89. GRB 101117B: Swift-XRT refined analysis
  90. GRB101114A: Swift/UVOT Upper Limits
  91. GRB 101117B: Swift-BAT refined analysis
  92. GRB 101117B: Enhanced Swift-XRT position
  93. GRB 101117B: Swift detection of a burst
  94. GRB 101114A: GROND Upper limits
  95. Konus-Wind observation of GRB 101114A
  96. Fermi GBM detection of a burst from a galactic source
  97. GRB 101114A: Swift-XRT candidate afterglow detection and analysis
  98. GRB 101114A, Swift-BAT GRB detected by ground processing
  99. GRB 101112A: Fermi GBM detection
  100. GRB 101112A: optical observations

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