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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"

32771 results found.

  1. GRB 060116: MARGE optical observations
  2. GRB 060121: Swift/UVOT upper limits
  3. GRB 060121: Liverpool Telescopes optical limits
  4. GRB 060121: Swift XRT refined analysis
  5. Konus-Wind observation of GRB 060121
  6. GRB 060121: I-band Limits
  7. GRB 060121: Confirmation of Afterglow
  8. GRB 060121: candidate optical counterpart
  9. GRB 060121: Swift XRT refined position
  10. GRB060121: SARA Observations
  11. GRB 060121: optical observations
  12. GRB 060121: Infrared Observations
  13. GRB 060121: optical observations
  14. GRB 060121: Optical imaging
  15. GRB060121 - SDSS pre-burst observations
  16. GRB 060121: A short-hard GRB in a cluster?
  17. GRB 060121: A bright short/hard GRB localized by HETE-2 WXM
  18. GRB 060117: PROMPT Observations
  19. GRB060117 - ATCA 3/6cm radio limits - correction
  20. GRB060117 - ATCA 3/6cm radio limits
  21. GRB 060116: photometric redshift - the farthest GRB?
  22. Correction to GCN 4542 on GRB 060117
  23. Konus-Wind observation of GRB 060117
  24. GRB 060116: possible I-J dropout
  25. GRB 060116: UKIRT IR Observations
  26. GRB060108: photometric redshift determination
  27. GRB 060117: Refined analysis of the Swift-BAT burst
  28. GRB 060116: PROMPT Observations
  29. GRB 060117: FRAM refined analysis
  30. GRB 060117: FRAM optical afterglow candidate
  31. GRB 060117: nearby galaxy
  32. GRB 060116: VLT optical observations
  33. GRB 060116: Refined analysis of the Swift-BAT burst
  34. GRB 060115: PROMPT Observations
  35. GRB 060116: XRT refined analysis
  36. GRB 060116: IR Candidate Afterglow
  37. GRB 060116: Swift/UVOT upper limits
  38. GRB060115: REM observations
  39. GRB 060110: XRT position and analysis
  40. GRB 060116 : Lulin optical limit
  41. GRB 060116: ROTSE-III Optical Limits
  42. GRB060116: XRT position
  43. GRB 060115: absorption redshift
  44. GRB 060115: Refined analysis of the Swift-BAT burst
  45. GRB 060115: OT photometry with MITSuME
  46. GRB 060115: Swift/UVOT upper limits
  47. GRB 060114: REM observations
  48. GRB 060115: Swift XRT refined analysis
  49. GRB 060115: OT finding chart
  50. GRB 060114: Swift/UVOT Observations
  51. GRB060115, optical observation
  52. GRB 060115: MITSuME optical afterglow candidate
  53. GRB 060114: Swift XRT upper limit
  54. GRB060114, optical observation
  55. GRB 060108: IR observations of afterglow
  56. GRB 060108: further analysis of VLT images
  57. GRB 060108: Evidence for an XRT Position Offset
  58. GRB 060110: KAIT observations
  59. GRB 060111B: Swift XRT refined analysis
  60. GRB 060111A: refined UVOT anaysis
  61. GRB 060111B: MITSuME detection of optical afterglow
  62. GRB 060111B: TAROT optical observation
  63. GRB060111B: RTT150, possible host galaxy
  64. GRB 060111B: Refined analysis of the Swift-BAT burst
  65. GRB 060110: MARGE observations
  66. GRB 060111(a): P60 Observations
  67. GRB 060111B: Gualba observatory limit
  68. GRB 060111B: ROTSE-III Detection of Optical Counterpart Flare
  69. GRB 060111: Swift-BAT Refined Analysis
  70. GRB 060108: VLT K-band observations
  71. GRB 060111: TAROT optical observation
  72. GRB 060111: possible UVOT counterpart
  73. GRB060111 : XRT refined analysis
  74. GRB 060111: ROTSE-III Optical Limits
  75. GRB 060110: Mitsume optical observations
  76. GRB 060110: Swift-BAT refined analysis
  77. GRB 060109: Swift-BAT refined analysis
  78. GRB 060108: z-band imaging from Gemini-North
  79. GRB 060110a: RAPTOR detection of early optical emission.
  80. GRB 060110: UKIRT K-band observations
  81. GRB 060110: ROTSE-III Confirmation of Optical Counterpart
  82. GRB 060110: IR Candidate Afterglow
  83. GRB060110, optical observation
  84. GRB 060110: Super-LOTIS observations
  85. GRB 060110: Optical observation
  86. GRB 060110: Correction
  87. Correction to GRB 060109 XRT analysis
  88. GRB 050110: IR Observations
  89. GRB 060110: Optical limit
  90. GRB 060109: Refined Swift-XRT analysis
  91. GRB 060109: Swift/UVOT upper limits
  92. GRB060109, optical observation
  93. GRB 060108: ISAS early observations and near IR upper limit
  94. GRB060108: P200 Ks Observations
  95. GRB 060108: early UKIRT K-band observations
  96. Swift UVOT correction to GCN 4455
  97. GRB 060108: a dark burst?
  98. GRB 060108: Refined XRT analysis
  99. GRB 060108: VLT J-band observations
  100. GRB 060108: Mitsume optical observations

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