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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"

20411 results found.

  1. GRB 101225A: MAXI/GSC observations
  2. GRB 101225A Late-time emission observed by Swift-BAT
  3. GRB 101225A, Swift-BAT refined analysis
  4. GRB 101225A: Swift/UVOT Detection
  5. GRB 101225A: Enhanced Swift-XRT position
  6. Trigger 441015 / GRB 101225A: Further NOT optical observation
  7. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  8. GRB 101225A (Swift trigger 441015): optical upper limit
  9. Trigger 441015: Swift detection of a possible burst or transient
  10. GRB 101224A: NOT optical observation
  11. GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle
  12. GRB 101224A: Swift/UVOT Upper Limits
  13. GRB 101224A: Swift-XRT refined Analysis
  14. GRB101224A: MITSuME Okayama optical upper limits
  15. GRB 101224A - UVOT-enhanced XRT position
  16. GRB 101224A: Swift detection of a short burst
  17. GRB 101219A: Chandra Observations
  18. GRB 101219B: Swift/UVOT refined analysis
  19. GRB 101219B: Enhanced Swift-XRT position
  20. GRB 101219A: MITSuME Ishigakijima Optical upper limits
  21. GRB 101219B: GROND Detection of the Optical/NIR Afterglow
  22. GRB 101219A: IAC80 optical observations
  23. GRB 101219B: Swift detection of a burst with an optical afterglow
  24. GRB 101219A: Swift/UVOT Upper Limits
  25. GRB 101219A: GROND Upper limits
  26. GRB 101219A: Magellan NIR observations
  27. GRB 101219A: Further Gemini-South Imaging
  28. GRB 101219A - NOT observation - upper limit
  29. GRB 101219A: SARA-N Upper Limit
  30. GRB 101219A: REM optical and NIR observations
  31. GRB 101219A: Swift detection of a short hard burst
  32. XRF 101117A, RIMOTS optical upper limits
  33. GRB 101213A: Fermi GBM observation
  34. GRB 101213A: Swift/UVOT Upper Limits
  35. GRB 101213A: Enhanced Swift-XRT position
  36. GRB 101213: object within the X-ray error circle
  37. GRB 101213A: Swift detection of a burst
  38. GRB101204A: Swift/UVOT observations
  39. GRB 101204A: Swift-XRT refined Analysis
  40. GRB101204A GROND Detection of the Optical/NIR Afterglow
  41. GRB 101204A Afterglow Candidate, VATT Observations
  42. GRB 101204A Swift-XRT/UVOT afterglow candidate
  43. GRB 101204A detected in ground analysis of BAT data
  44. GRB101030A
  45. GRB 101201A: Swift-XRT refined Analysis
  46. GRB 101201A: Swift/UVOT Detection
  47. GRB 101201A: GROND Detection of the Optical/NIR Afterglow
  48. GRB 101123A: MASTER prompt optical observations
  49. Konus-Wind observation of GRB 101123A
  50. GRB 101123A: Fermi GBM detection
  51. GRB 101117B: GROND Upper limits
  52. GRB 101117B: Swift/UVOT Observations of the Optical Afterglow
  53. XRF 101117A: Palomar Transient Factory Observations
  54. GRB101114A: Swift/UVOT Upper Limits
  55. GRB 101117B: Enhanced Swift-XRT position
  56. GRB 101117B: Swift detection of a burst
  57. XRF101117A: MAXI/GSC detection of a short X-ray transient
  58. GRB 101114A: GROND Upper limits
  59. GRB 101114A: Swift-XRT candidate afterglow detection and analysis
  60. GRB 101112A: optical observations
  61. GRB 101112A - XRT source detection/analysis
  62. GRB 101030A : MOA optical observation
  63. GRB 101030A: GROND optical/NIR afterglow candidate
  64. GRB 101030A: Swift/UVOT Upper Limits
  65. GRB 101030A: Enhanced Swift-XRT position
  66. GRB 101030A: Swift detection of a burst
  67. GRB 090111, the review of the sky area in plate archives (1976-1996)
  68. GRB 101024A: GROND optical/NIR observations
  69. GRB 101024A: Zadko observatory - Gingin. Optical observations
  70. GRB101024A: Swift/UVOT
  71. GRB 101024A: Swift-BAT refined analysis
  72. GRB 101024A: Enhanced Swift-XRT position
  73. Swift/UVOT observations of GRB101023A
  74. GRB 101024A: Swift detection of a burst with an optical afterglow
  75. GGRB 101023A: GROND detection of the optical-NIR afterglow
  76. GRB 101023A: Gemini discovery of optical afterglow
  77. GRB 101023A: Enhanced Swift-XRT position
  78. GRB 101023A: REM NIR observations
  79. GRB 101023A: Swift detection of a burst
  80. GRB 101020A, Swift-BAT refined analysis
  81. GRB 101017A: Swift XRT refined analysis
  82. GRB 101017A: Swift/UVOT Observations
  83. GRB 101008A: optical observations
  84. GRB101017A: MITSuME Okayama optical upper limits
  85. GRB 101017A: Enhanced Swift-XRT position
  86. GRB 101017A: Swift detection of a burst with optical counterpart
  87. Konus-Wind observation of GRB 101014A
  88. GRB 100906A: D50 optical detection
  89. GRB 100902A: D50 optical limit
  90. GRB 101011A: Swift/UVOT observations
  91. GRB 101011A, GROND upper limits
  92. GRB 101011A: Zadko observatory - Gingin optical observations
  93. GRB 101011A: XRT Refined Analysis
  94. GRB 101011A: Swift/UVOT Observations of a Possible Optical Afterglow
  95. GRB 101011A: Enhanced Swift-XRT position
  96. GRB 101011A: Swift detection of a burst
  97. GRB101008A, GROND detection of a fading afterglow
  98. GRB 101008A: SAO RAS optical observations
  99. GRB 100915 optical upper limit
  100. GRB 101008: Swift/UVOT Upper Limits

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