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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"

20519 results found.

  1. GRB 110106A: TNG optical observations and candidate counterparts
  2. GRB 110106A: Swift detection of a burst
  3. GRB 101225A: Host galaxy
  4. GRB110102A: Swift/UVOT observations
  5. GRB110102A: MITSuME Okayama Optical Observation
  6. GRB 110102A: Enhanced Swift-XRT position
  7. GRB 110102A: Swift detection of a burst with an optical detection
  8. GRB 101225A: P60 Observations
  9. GRB 101225A: MAXI/GSC observations
  10. GRB 101225A Late-time emission observed by Swift-BAT
  11. GRB 101225A, Swift-BAT refined analysis
  12. GRB 101225A: Swift/UVOT Detection
  13. GRB 101225A: Enhanced Swift-XRT position
  14. Trigger 441015 / GRB 101225A: Further NOT optical observation
  15. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  16. GRB 101225A (Swift trigger 441015): optical upper limit
  17. Trigger 441015: Swift detection of a possible burst or transient
  18. GRB 101224A: NOT optical observation
  19. GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle
  20. GRB 101224A: Swift/UVOT Upper Limits
  21. GRB 101224A: Swift-XRT refined Analysis
  22. GRB101224A: MITSuME Okayama optical upper limits
  23. GRB 101224A - UVOT-enhanced XRT position
  24. GRB 101224A: Swift detection of a short burst
  25. GRB 101219A: Chandra Observations
  26. GRB 101219B: Swift/UVOT refined analysis
  27. GRB 101219B: Enhanced Swift-XRT position
  28. GRB 101219A: MITSuME Ishigakijima Optical upper limits
  29. GRB 101219B: GROND Detection of the Optical/NIR Afterglow
  30. GRB 101219A: IAC80 optical observations
  31. GRB 101219B: Swift detection of a burst with an optical afterglow
  32. GRB 101219A: Swift/UVOT Upper Limits
  33. GRB 101219A: GROND Upper limits
  34. GRB 101219A: Magellan NIR observations
  35. GRB 101219A: Further Gemini-South Imaging
  36. GRB 101219A - NOT observation - upper limit
  37. GRB 101219A: SARA-N Upper Limit
  38. GRB 101219A: REM optical and NIR observations
  39. GRB 101219A: Swift detection of a short hard burst
  40. XRF 101117A, RIMOTS optical upper limits
  41. GRB 101213A: Fermi GBM observation
  42. GRB 101213A: Swift/UVOT Upper Limits
  43. GRB 101213A: Enhanced Swift-XRT position
  44. GRB 101213: object within the X-ray error circle
  45. GRB 101213A: Swift detection of a burst
  46. GRB101204A: Swift/UVOT observations
  47. GRB 101204A: Swift-XRT refined Analysis
  48. GRB101204A GROND Detection of the Optical/NIR Afterglow
  49. GRB 101204A Afterglow Candidate, VATT Observations
  50. GRB 101204A Swift-XRT/UVOT afterglow candidate
  51. GRB 101204A detected in ground analysis of BAT data
  52. GRB101030A
  53. GRB 101201A: Swift-XRT refined Analysis
  54. GRB 101201A: Swift/UVOT Detection
  55. GRB 101201A: GROND Detection of the Optical/NIR Afterglow
  56. GRB 101123A: MASTER prompt optical observations
  57. Konus-Wind observation of GRB 101123A
  58. GRB 101123A: Fermi GBM detection
  59. GRB 101117B: GROND Upper limits
  60. GRB 101117B: Swift/UVOT Observations of the Optical Afterglow
  61. XRF 101117A: Palomar Transient Factory Observations
  62. GRB101114A: Swift/UVOT Upper Limits
  63. GRB 101117B: Enhanced Swift-XRT position
  64. GRB 101117B: Swift detection of a burst
  65. XRF101117A: MAXI/GSC detection of a short X-ray transient
  66. GRB 101114A: GROND Upper limits
  67. GRB 101114A: Swift-XRT candidate afterglow detection and analysis
  68. GRB 101112A: optical observations
  69. GRB 101112A - XRT source detection/analysis
  70. GRB 101030A : MOA optical observation
  71. GRB 101030A: GROND optical/NIR afterglow candidate
  72. GRB 101030A: Swift/UVOT Upper Limits
  73. GRB 101030A: Enhanced Swift-XRT position
  74. GRB 101030A: Swift detection of a burst
  75. GRB 090111, the review of the sky area in plate archives (1976-1996)
  76. GRB 101024A: GROND optical/NIR observations
  77. GRB 101024A: Zadko observatory - Gingin. Optical observations
  78. GRB101024A: Swift/UVOT
  79. GRB 101024A: Swift-BAT refined analysis
  80. GRB 101024A: Enhanced Swift-XRT position
  81. Swift/UVOT observations of GRB101023A
  82. GRB 101024A: Swift detection of a burst with an optical afterglow
  83. GGRB 101023A: GROND detection of the optical-NIR afterglow
  84. GRB 101023A: Gemini discovery of optical afterglow
  85. GRB 101023A: Enhanced Swift-XRT position
  86. GRB 101023A: REM NIR observations
  87. GRB 101023A: Swift detection of a burst
  88. GRB 101020A, Swift-BAT refined analysis
  89. GRB 101017A: Swift XRT refined analysis
  90. GRB 101017A: Swift/UVOT Observations
  91. GRB 101008A: optical observations
  92. GRB101017A: MITSuME Okayama optical upper limits
  93. GRB 101017A: Enhanced Swift-XRT position
  94. GRB 101017A: Swift detection of a burst with optical counterpart
  95. Konus-Wind observation of GRB 101014A
  96. GRB 100906A: D50 optical detection
  97. GRB 100902A: D50 optical limit
  98. GRB 101011A: Swift/UVOT observations
  99. GRB 101011A, GROND upper limits
  100. GRB 101011A: Zadko observatory - Gingin optical observations

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