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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"

43000 results found.

  1. GRB 060116: possible I-J dropout
  2. GRB 060116: UKIRT IR Observations
  3. GRB060108: photometric redshift determination
  4. GRB 060117: Refined analysis of the Swift-BAT burst
  5. GRB 060116: PROMPT Observations
  6. GRB 060117: FRAM refined analysis
  7. GRB 060117: FRAM optical afterglow candidate
  8. GRB 060117: nearby galaxy
  9. GRB 060117: Swift-BAT detection of a bright burst
  10. GRB 060116: VLT optical observations
  11. GRB 060115: PROMPT Observations
  12. GRB 060116: XRT refined analysis
  13. GRB 060116: IR Candidate Afterglow
  14. GRB 060116: Swift/UVOT upper limits
  15. GRB060115: REM observations
  16. GRB 060110: XRT position and analysis
  17. GRB 060116 : Lulin optical limit
  18. GRB 060116: ROTSE-III Optical Limits
  19. GRB060116: Faulkes North observation
  20. GRB 060115: absorption redshift
  21. GRB 060116: Swift-BAT detection of a burst
  22. GRB 060115: Refined analysis of the Swift-BAT burst
  23. GRB 060115: OT photometry with MITSuME
  24. GRB 060114: REM observations
  25. GRB 060115: Swift XRT refined analysis
  26. GRB 060115: OT finding chart
  27. GRB 060114: Swift/UVOT Observations
  28. GRB 060115: MITSuME optical afterglow candidate
  29. GRB 060115: Swift detection of a burst
  30. GRB 060114: Swift XRT upper limit
  31. GRB 060114: refined position
  32. GRB 060114: A long GRB detected by INTEGRAL
  33. GRB060114: Faulkes North observation
  34. GRB 060108: IR observations of afterglow
  35. GRB060108: Faulkes North afterglow evidence
  36. GRB 060108: further analysis of VLT images
  37. GRB 060108: Evidence for an XRT Position Offset
  38. GRB 060110: KAIT observations
  39. GRB 060111B: Swift XRT refined analysis
  40. GRB 060111B: MITSuME detection of optical afterglow
  41. GRB 060111B: TAROT optical observation
  42. GRB060111B: RTT150, possible host galaxy
  43. GRB 060111B: Refined analysis of the Swift-BAT burst
  44. GRB 060110: MARGE observations
  45. GRB 060111(a): P60 Observations
  46. GRB 060111B: Gualba observatory limit
  47. GRB 060111B: ROTSE-III Detection of Optical Counterpart Flare
  48. GRB 060111B: Swift detection of a burst
  49. GRB 060111: Swift-BAT Refined Analysis
  50. GRB 060108: VLT K-band observations
  51. GRB 060111: TAROT optical observation
  52. GRB060111 : XRT refined analysis
  53. GRB 060111: ROTSE-III Optical Limits
  54. GRB 060111: Swift detection of a burst
  55. GRB 060110: Mitsume optical observations
  56. GRB 060109: Swift-BAT refined analysis
  57. GRB 060108: z-band imaging from Gemini-North
  58. GRB 060110: UKIRT K-band observations
  59. GRB 060110: IR Candidate Afterglow
  60. GRB 060110: Super-LOTIS observations
  61. GRB 060110: Optical observation
  62. GRB 060110: Correction
  63. Correction to GRB 060109 XRT analysis
  64. GRB 060110: Optical limit
  65. GRB 060110: Swift-BAT detection of a burst
  66. GRB 060109: Refined Swift-XRT analysis
  67. GRB 060108: ISAS early observations and near IR upper limit
  68. GRB060108: P200 Ks Observations
  69. GRB 060109: Swift Detection of a long burst
  70. GRB 060108: a dark burst?
  71. GRB 060108: Refined XRT analysis
  72. GRB 060108: VLT J-band observations
  73. GRB 060108: Mitsume optical observations
  74. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  75. GRB060108: SDSS pre-burst observations
  76. GRB 060108: Refined analysis of the Swift-BAT burst
  77. GRB 060108: Swift XRT position
  78. GRB060108: Swift detection of its 100th GRB
  79. Konus-Wind observation of GRB 060105
  80. GRB 060105: ISAS observations and near IR upper limit
  81. GRB 060105: Swift/UVOT upper limits
  82. GRB 060105: Mitsume optical observations
  83. GRB 060105: BAT refined analysis
  84. GRB 060102 - no XRT afterglow
  85. GRB 060105: XRT refined analysis
  86. GRB060105: Suzaku-XIS and -HXD observation plan
  87. GRB060105: Swift detection of a bright long burst
  88. Swift-BAT trigger 175653 is not an astrophysical source
  89. GRB 060102: MDM Observation
  90. Swift-BAT trigger 175653 is probably not a GRB
  91. GRB 060102: Swift-BAT detection of a burst
  92. GRB051211B: optical observations
  93. GRB051227: SARA Observations
  94. GRB 051227: Likely host galaxy underlying afterglow position
  95. GRB 051227: optical observation
  96. GRB 051221A: VLA Radio Observations
  97. GRB051227: Radio Observations
  98. GRB 051227: Confirmed fading from Gemini observations
  99. GRB051227: further analysis of VLT images
  100. GRB 051227: optical afterglow

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