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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"

21003 results found.

  1. GRB 060526: MDM-2.4m Observations
  2. GRB 060526: RTT150 optical observations
  3. GRB060526: Further Swift-UVOT Observations
  4. GRB060526, optical observations
  5. GRB 060526: Magellan Redshift
  6. GRB 060526: TNG optical observations
  7. GRB 060526: ROTSE-III Observations of Optical Counterpart
  8. GRB 060526: Watcher Observations
  9. GRB060526 - SDSS Pre-burst Observations
  10. GRB 060526: Continued emission for the Swift burst
  11. GRB060505: VLT observations of the optical afterglow
  12. GRB 060413 : WIDGET simultaneous optical observations
  13. GRB 060522: Swift/UVOT Observations: Correction
  14. GRB 060522: Swift/UVOT Observations of the Optical Afterglow
  15. GRB060512: Late-Time P200 Observations
  16. GRB 060522: REM NIR observations
  17. GRB 060522: TNG optical observations
  18. GRB060515: P200 NIR Observations
  19. GRB 060512: TAROT optical observation
  20. GRB 060515: Super-LOTIS Observations
  21. Swift/UVOT observations of GRB060512.
  22. GRB 060512: Subaru NIR observation
  23. GRB 060512: 1.54m Kuiper Observations
  24. GRB 060512: Detection of NIR afterglow
  25. GRB 060512: P60 Observations
  26. GRB 060512: optical decay
  27. GRB 060512: REM NIR observations
  28. GRB060512 - SDSS Pre-Burst Observations
  29. GRB060512 Name Correction: LT Afterglow detection
  30. GRB060512: Liverpool Telescope Afterglow detection
  31. GRB060418: optical observations
  32. GRB 060428a, SMARTS optical/IR afterglow detection
  33. GRB060510 - SDSS Pre-Burst Observations
  34. GRB 060510b: Redshift
  35. GRB 060510b: Gemini NIR observations
  36. GRB 060510B: Super-LOTIS Observations
  37. GRB 060510b: NIR observations
  38. GRB 060510B: MDM Observations and candidate OT
  39. GRB 060510B: Swift detection of a burst
  40. GRB 060505: PROMPT Observations
  41. GRB 060507: MDM Optical Upper Limit
  42. GRB060507: Swift XRT position
  43. GRB060505: Swift/UVOT Observations
  44. GRB060425: new MASTER survey method
  45. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  46. GRB 060505: Swift XRT afterglow canditate position
  47. GRB 060502b: Second epoch Gemini observations
  48. GRB 060502B: optical observations
  49. GRB 060502B: AROMA refined photometric calibration
  50. GRB 060502B MDM Follow-up Observation
  51. GRB 060502A: Swift/UVOT source detection
  52. GRB 060502B: MDM Optical Observation
  53. GRB 060502B: AROMA optical observations
  54. Short GRB 060502B: Tautenburg Observation
  55. GRB 060427B Milagro GeV/TeV Observations
  56. GRB 060502A: TTT Observations
  57. GRB 060501: P60 Observations and Candidate Retraction
  58. GRB 060502B: MASTER optical observations
  59. GRB060502: Gemini spectroscopy
  60. GRB 060502: APO Spectroscopic Observations
  61. GRB060501: Swift UVOT followup observations
  62. GRB060502: Super-LOTIS Observations
  63. GRB 060502: P60 Afterglow Confirmation
  64. GRB 060501: MDM Observations
  65. GRB060501: Super-LOTIS observations
  66. GRB060428B - SDSS Pre-Burst Observations
  67. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  68. GRB 060428B: MDM Observations
  69. GRB 060428A: PROMPT Observations
  70. GRB 060427B: MASTER optical observations
  71. GRB 060428B: KAIT observations
  72. GRB060425:MASTER optical limit
  73. GRB 051117A: Bright host galaxy not confirmed
  74. GRB060428A: Swift/UVOT observations.
  75. GRB 060428b : Kiso R-band limit
  76. GRB 060428b: Optical afterglow candidate
  77. GRB 060427: NIR observations
  78. GRB060427: Xinglong optical Observations
  79. GRB 060427: NOT observations
  80. GRB060425:MASTER survey observations
  81. GRB060424: optical afterglow detection
  82. GRB060418: Further Analysis of MIKE Spectroscopy
  83. GRB 060424: Swift detection of a burst
  84. GRB 060421: TTT Observations
  85. OT 060420: Likely Not a New Cosmic Transient
  86. OT 060420: CONCAM detection of a candidate new magnitude 5 optical
  87. GRB060421: Swift/UVOT observations
  88. GRB 060418: prediction of t_break
  89. GRB060418: optical observations
  90. Konus-Wind observation of GRB 060418
  91. Erratum of GCN 4983 for GRB 060418 IR follow-up
  92. GRB 060418 : IR afterglow observations
  93. GRB 060418: JHKs PAIRITEL Observations of Afterglow
  94. GRB 060418: Radio Observations
  95. GRB060418: Swift/UVOT Observations
  96. GRB060418: Optical Observations
  97. VLT/UVES observations of GRB060418
  98. GRB 060418, SMARTS continuing afterglow observations
  99. GRB 060418: PROMPT Detections
  100. GRB 060418, SMARTS optical/IR afterglow observations

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