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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"

8293 results found.

  1. GRB 060719: Continued LCO optical observations
  2. GRB 060719: Swift detection of a burst
  3. GRB 060717 optical upper limit
  4. GRB 060714: REM infrared observations
  5. GRB 060717: Swift detection of a burst
  6. GRB 060714 : Liverpool Telescope Observations
  7. GRB 060714: OA redshift
  8. GRB 060708: VLT spectroscopy
  9. GRB060714: optical observations
  10. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  11. GRB060712: MASTER optical observation
  12. GRB120706: MASTER optical observation
  13. GRB 060707: Swift-XRT refined analysis
  14. GRB 060708: Swift detection of a burst with an UVOT countpart
  15. GRB 060707: BOOTES-IR optical afterglow candidate
  16. GRB 060707: Swift detection of a burst
  17. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  18. GRB060602A: Swift/UVOT upper limits
  19. GRB 060607: Swift detection of a burst with bright optical counterpart
  20. GRB060605: Spectral Observations and Redshift
  21. GRB 060605: Swift detection of a burst with optical counterpart
  22. GRB060604: Swift/UVOT detections
  23. GRB 060604: redshift
  24. GRB 060604: Swift detection of a burst with possible optical counterpart
  25. GRB 060602B: Swift detection of a burst
  26. GRB060602B: Watcher observations - no OT candidate
  27. GRB060602B: BOOTES-IR candidate afterglow
  28. GRB 060526: Refined analysis of the Swift-BAT burst
  29. GRB 060526: Swift/XRT Team refined analysis
  30. GRB 060526: Continued emission for the Swift burst
  31. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  32. GRB 060522: Swift-BAT Refined Analysis
  33. GRB 060522: REM NIR observations
  34. GRB 060522: TNG optical observations
  35. GRB 060515: Swift/XRT Team refined analysis
  36. GRB 060515: Super-LOTIS Observations
  37. GRB060515: Swift/UVOT initial observation
  38. GRB 060515: TAROT optical observation
  39. GRB 060512: 1.54m Kuiper Observations
  40. GRB 060505 - OT candidate + galaxy spectrum
  41. GRB 060512: Swift detection of a burst with an optical afterglow
  42. GRB060510B : Faulkes North Telescope detection
  43. GRB 060510b: Gemini NIR observations
  44. GRB 060510b: NIR observations
  45. GRB 060510B: MDM Observations and candidate OT
  46. GRB 060510B: Swift detection of a burst
  47. GRB060502B: improvement in the XRT afterglow position
  48. GRB 060507: Swift/UVOT Upper Limits
  49. GRB 060507: MDM Optical Upper Limit
  50. GRB 060505: Swift XRT Team Refined Analysis
  51. GRB060425: new MASTER survey method
  52. GRB 060502B MDM Follow-up Observation
  53. GRB060502B: correction to XRT position
  54. GRB 060501: P60 Observations and Candidate Retraction
  55. GRB 060502B: MASTER optical observations
  56. GRB 060502: P60 Afterglow Confirmation
  57. GRB 060501: MDM Observations
  58. GRB060501: Super-LOTIS observations
  59. GRB060501: P60 imaging and afterglow candidate
  60. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  61. GRB060428B: Swift XRT Team refined analysis
  62. GRB 060428B: Xinglong I-band limit
  63. GRB 060428B: KAIT observations
  64. GRB060428A: Swift/UVOT observations.
  65. GRB 060428b : Kiso R-band limit
  66. GRB060427:MASTER optical limit
  67. GRB 060428b: Optical afterglow candidate
  68. GRB 060428B: Swift detection of a burst
  69. GRB 060427: NIR observations
  70. GRB 060428: Swift detection of a burst
  71. GRB 060427: Swift/UVOT upper limits.
  72. GRB060425:MASTER survey observations
  73. GRB 060427: Swift detection of a burst
  74. OT 060420: Likely Not a New Cosmic Transient
  75. OT 060420: CONCAM detection of a candidate new magnitude 5 optical
  76. GRB060421: Swift/UVOT observations
  77. GRB(?)060421:MASTER optical limit
  78. GRB(?) 060421: Swift detection of a burst
  79. GRB 060418, SMARTS optical/IR afterglow observations
  80. GRB060418 : LT optical afterglow observation
  81. GRB 060418: REM candidate afterglow
  82. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  83. GRB060413: Swift/UVOT upper limits
  84. SGR 1900+14: Swift detection of an outburst
  85. GRB 060413: Refined analysis of the Swift-BAT burst
  86. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  87. GRB 060403: Refined analysis of the Swift-BAT burst
  88. GRB 060403: Swift detection of a burst
  89. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  90. GRB 060322: Confirmation of Swift XRT afterglow
  91. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  92. GRB060323: NOT optical observations
  93. GRB 060322: Swift XRT afterglow candidate
  94. GRB 060323: optical afterglow confirmed
  95. GRB 060323: Optical Observations
  96. GRB 060323: Tautenburg OT candidate retraction
  97. GRB 060323: optical observations at TNG
  98. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  99. GRB 060323: Swift/XRT position
  100. GRB 060322: Swift-BAT detection of a 200-sec burst

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