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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"

20506 results found.

  1. GRB 060526: TNG optical observations
  2. GRB 060526: Watcher Observations
  3. GRB060526 - SDSS Pre-burst Observations
  4. GRB 060526: Continued emission for the Swift burst
  5. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  6. GRB060505: VLT observations of the optical afterglow
  7. GRB 060413 : WIDGET simultaneous optical observations
  8. XMM-Newton observation of GRB060510b
  9. GRB060512: Late-Time P200 Observations
  10. GRB 060522: Swift/XRT Team refined analysis
  11. GRB 060522: REM NIR observations
  12. GRB 060522: TNG optical observations
  13. GRB 060515: NIR observation
  14. GRB060515: P200 NIR Observations
  15. GRB 060505 BAT refined analysis
  16. GRB 060515 BAT refined analysis
  17. GRB 060512: TAROT optical observation
  18. GRB 060515: Swift/XRT Team refined analysis
  19. GRB 060515: Swift/UVOT Upper Limits
  20. GRB 060515: Swift/XRT position
  21. GRB 060515: Super-LOTIS Observations
  22. GRB 060515: TAROT optical observation
  23. GRB 060512: Subaru NIR observation
  24. GRB 060512: 1.54m Kuiper Observations
  25. GRB 060512: Detection of NIR afterglow
  26. GRB 060512: P60 Observations
  27. GRB 060512: Swift-BAT Refined Analysis
  28. GRB 060505 - OT candidate + galaxy spectrum
  29. GRB 060512: REM NIR observations
  30. GRB060512 - SDSS Pre-Burst Observations
  31. GRB 060512: Swift detection of a burst with an optical afterglow
  32. GRB 060505: X-ray afterglow - Correction -
  33. GRB 060505: X-ray afterglow
  34. GRB060418: optical observations
  35. GRB060510 - SDSS Pre-Burst Observations
  36. GRB 060510B: Swift detection of a burst
  37. GRB 060510: Swift detection of a burst with optical transient
  38. GRB060507: optical afterglow detection
  39. GRB060502B: improvement in the XRT afterglow position
  40. GRB 060505: PROMPT Observations
  41. GRB 060507: Swift XRT Team Refined Analysis
  42. GRB060505: Swift/UVOT Observations
  43. GRB060425: new MASTER survey method
  44. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  45. GRB 060505: Swift XRT afterglow canditate position
  46. GRB 060502b: Second epoch Gemini observations
  47. GRB 060505: Swift-BAT detection of a weak burst
  48. GRB 060428B: spectroscopy
  49. GRB 060502B: optical observations
  50. GRB 060502B: AROMA refined photometric calibration
  51. GRB 060502B MDM Follow-up Observation
  52. GRB 060502b: Gemini imaging and spectroscopy
  53. GRB060502A, optical observation
  54. GRB 060502B: Swift/UVOT upper limits
  55. GRB 060502A: Swift/UVOT source detection
  56. GRB 060429: Refined IPN error box and Konus-Wind spectrum
  57. GRB 060502B: Refined analysis of the Swift-BAT short burst
  58. GRB060502B: Swift XRT Team refined analysis
  59. GRB 060501: P60 Observations and Candidate Retraction
  60. GRB 060502B: Xinglong optical observation
  61. GRB060501: Swift UVOT followup observations
  62. GRB 060502: P60 Afterglow Confirmation
  63. GRB 060502: Swift detection of a burst with an optical counterpart
  64. GRB060501: P60 imaging and afterglow candidate
  65. GRB 060501: Refined analysis of the Swift-BAT burst
  66. GRB060428B - SDSS Pre-Burst Observations
  67. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  68. GRB 060428A: PROMPT Observations
  69. GRB060428B: Swift XRT Team refined analysis
  70. GRB 060427B: IPN localization of a short hard burst
  71. GRB 060428B: Xinglong I-band limit
  72. GRB 051117A: Bright host galaxy not confirmed
  73. GRB060428A: Swift/UVOT observations.
  74. GRB060428B, optical observation
  75. GRB 060428b : Kiso R-band limit
  76. GRB 060428b: Optical afterglow candidate
  77. GRB 060428B: Swift detection of a burst
  78. GRB 060427: NIR observations
  79. GRB060427: Xinglong optical Observations
  80. GRB 060428: Swift detection of a burst
  81. GRB 060427: Swift/UVOT upper limits.
  82. GRB060427: Swift XRT Team refined analysis
  83. GRB060418: Swift XRT Team Further Refined Analysis
  84. GRB 060427, optical observation
  85. GRB 060427: Swift detection of a burst
  86. GRB 060424: Refined analysis of the Swift-BAT burst
  87. GRB060421: Swift/UVOT observations
  88. GRB(?) 060421: Swift detection of a burst
  89. GRB 060418: Radio Observations
  90. GRB060418, BVRcIc field calibration
  91. GRB060418: Swift/UVOT Observations
  92. GRB060418: Swift XRT Team Refined Analysis
  93. GRB060418 : LT optical afterglow observation
  94. GRB 060418: REM candidate afterglow
  95. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  96. GRB060413: Swift/UVOT upper limits
  97. GRB 060413: REM NIR Observations
  98. GRB 060413: Watcher UBVR observations
  99. GRB 060413: XRT refined analysis
  100. GRB 060403: MITSuME optical observation

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