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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

36188 results found.

  1. GRB 060116: Swift-BAT detection of a burst
  2. GRB 060115: Refined analysis of the Swift-BAT burst
  3. GRB 060115: OT photometry with MITSuME
  4. GRB 060115: Swift/UVOT upper limits
  5. GRB 060114: REM observations
  6. GRB 060115: Swift XRT refined analysis
  7. GRB 060115: OT finding chart
  8. GRB 060114: Swift/UVOT Observations
  9. GRB 060115: MITSuME optical afterglow candidate
  10. GRB 060115: Swift detection of a burst
  11. GRB 060114: Swift XRT upper limit
  12. GRB 060114: refined position
  13. GRB 060114: A long GRB detected by INTEGRAL
  14. GRB060114: Faulkes North observation
  15. GRB 060108: IR observations of afterglow
  16. GRB060108: Faulkes North afterglow evidence
  17. GRB 060108: further analysis of VLT images
  18. GRB 060108: Evidence for an XRT Position Offset
  19. GRB 060110: KAIT observations
  20. GRB 060111B: Swift XRT refined analysis
  21. GRB 060111A: refined UVOT anaysis
  22. GRB 060111B: MITSuME detection of optical afterglow
  23. GRB 060111B: TAROT optical observation
  24. GRB060111A: RTT150 optical observations
  25. GRB060111B: RTT150, possible host galaxy
  26. GRB 060111B: Refined analysis of the Swift-BAT burst
  27. GRB 060110: MARGE observations
  28. GRB 060111(a): P60 Observations
  29. GRB 060111B: Gualba observatory limit
  30. GRB 060111B: ROTSE-III Detection of Optical Counterpart Flare
  31. GRB 060111B: Swift detection of a burst
  32. GRB 060111: Swift-BAT Refined Analysis
  33. GRB060111.2:_MASTER optical limit
  34. GRB 060108: VLT K-band observations
  35. GRB 060111: TAROT optical observation
  36. GRB 060111: possible UVOT counterpart
  37. GRB 060111: ROTSE-III Optical Limits
  38. GRB 060111: Swift detection of a burst
  39. GRB 060110: Mitsume optical observations
  40. GRB 060110: Swift-BAT refined analysis
  41. GRB 060109: Swift-BAT refined analysis
  42. GRB 060108: z-band imaging from Gemini-North
  43. GRB 060110a: RAPTOR detection of early optical emission.
  44. GRB 060110: UKIRT K-band observations
  45. GRB 060110: ROTSE-III Confirmation of Optical Counterpart
  46. GRB 060110: IR Candidate Afterglow
  47. GRB 060110: Super-LOTIS observations
  48. GRB 060110: Optical observation
  49. GRB 060110: Correction
  50. Correction to GRB 060109 XRT analysis
  51. GRB 050110: IR Observations
  52. GRB 060110: Optical limit
  53. GRB 060110: Swift-BAT detection of a burst
  54. GRB 060109: Refined Swift-XRT analysis
  55. GRB 060109: Swift/UVOT upper limits
  56. GRB060109, optical observation
  57. GRB 060108: ISAS early observations and near IR upper limit
  58. GRB060108: P200 Ks Observations
  59. GRB 060108: early UKIRT K-band observations
  60. Swift UVOT correction to GCN 4455
  61. GRB 060109: Swift Detection of a long burst
  62. GRB 060108: a dark burst?
  63. GRB 060108: Refined XRT analysis
  64. GRB 060108: VLT J-band observations
  65. GRB 060108: Mitsume optical observations
  66. GRB 060108: Swift/UVOT upper limits
  67. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  68. GRB060108: SDSS pre-burst observations
  69. GRB060108: Faulkes Telescope observation
  70. GRB 060108: Refined analysis of the Swift-BAT burst
  71. GRB 060108: Swift XRT position
  72. GRB060108: Swift detection of its 100th GRB
  73. GRB 060105: pseudo-z from spectral parameters of the prompt emission
  74. GRB 060105: Radio observations
  75. GRB 060105: MDM Observation
  76. Konus-Wind observation of GRB 060105
  77. GRB 060105: ISAS observations and near IR upper limit
  78. GRB 060105: Swift/UVOT upper limits
  79. GRB 060105: Mitsume optical observations
  80. GRB 060105: BAT refined analysis
  81. GRB 060102 - no XRT afterglow
  82. GRB 060105: XRT refined analysis
  83. GRB060105: Suzaku-XIS and -HXD observation plan
  84. GRB060105, optical observation
  85. GRB060105 : Kiso optical observation
  86. GRB060105: Swift detection of a bright long burst
  87. Swift-BAT trigger 175653 is not an astrophysical source
  88. GRB 060102: MDM Observation
  89. Swift-BAT trigger 175653 is probably not a GRB
  90. GRB 060102: Swift-BAT refined analysis
  91. Time Correction to GRB 060102
  92. GRB 060102: Swift-BAT detection of a burst
  93. GRB051211B: optical observations
  94. GRB051227: SARA Observations
  95. GRB 051221B: Optical Observations with Kuiper 1.54m
  96. GRB 051227: Likely host galaxy underlying afterglow position
  97. GRB 051227: optical observation
  98. GRB 051221A: VLA Radio Observations
  99. GRB 051227: Confirmed fading from Gemini observations
  100. GRB051227: further analysis of VLT images

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