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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"

21263 results found.

  1. GRB 060429: Suzaku WAM observation
  2. GRB060505: Swift/UVOT Observations
  3. GRB060425: new MASTER survey method
  4. GRB 060505: Swift XRT afterglow canditate position
  5. GRB 060502b: Second epoch Gemini observations
  6. GRB 060428B: spectroscopy
  7. GRB 060502B: optical observations
  8. GRB 060502B: AROMA refined photometric calibration
  9. GRB 060502B MDM Follow-up Observation
  10. GRB 060502b: Gemini imaging and spectroscopy
  11. GRB060502A, optical observation
  12. GRB 060502B: Swift/UVOT upper limits
  13. GRB 060502A: Swift/UVOT source detection
  14. GRB 060429: Refined IPN error box and Konus-Wind spectrum
  15. GRB060502B: Swift XRT Team refined analysis
  16. GRB 060501: P60 Observations and Candidate Retraction
  17. GRB 060502B: Xinglong optical observation
  18. GRB 060502B: MASTER optical observations
  19. GRB 060502: Swift-BAT refined analysis
  20. GRB060501: Swift UVOT followup observations
  21. GRB060502: Super-LOTIS Observations
  22. GRB 060502: P60 Afterglow Confirmation
  23. GRB 060502: Swift detection of a burst with an optical counterpart
  24. GRB060501: P60 imaging and afterglow candidate
  25. GRB 060501: Swift detection of a burst
  26. Konus-Wind observation of GRB 060427B
  27. GRB060428B - SDSS Pre-Burst Observations
  28. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  29. GRB060428B: Swift XRT Team refined analysis
  30. GRB 060427B: IPN localization of a short hard burst
  31. GRB 060428B: Xinglong I-band limit
  32. GRB 051117A: Bright host galaxy not confirmed
  33. GRB060428A: Swift/UVOT observations.
  34. GRB060428B, optical observation
  35. GRB 060428A: Refined analysis of the Swift-BAT burst
  36. GRB 060428b : Kiso R-band limit
  37. GRB 060428b: Optical afterglow candidate
  38. GRB 060428B: Swift detection of a burst
  39. GRB 060427: NIR observations
  40. GRB060427: Xinglong optical Observations
  41. GRB 060428: Swift detection of a burst
  42. GRB 060427: Swift/UVOT upper limits.
  43. GRB 060427: Refined analysis of the Swift-BAT burst
  44. GRB 060427, optical observation
  45. GRB 060427: Swift detection of a burst
  46. GRB 060425: IPN localization and KW spectrum of a short, hard burst
  47. GRB 060424: Refined analysis of the Swift-BAT burst
  48. GRB 060424: Swift detection of a burst
  49. GRB 060421: TTT Observations
  50. OT 060420: CONCAM detection of a candidate new magnitude 5 optical
  51. GRB060421: Swift/UVOT observations
  52. Konus-Wind observation of GRB 060418
  53. GRB(?) 060421: Swift detection of a burst
  54. GRB 060418: Radio Observations
  55. GRB060418, BVRcIc field calibration
  56. GRB060418: Swift/UVOT Observations
  57. GRB060418: Optical Observations
  58. GRB 060418: FRAM early afterglow observation
  59. VLT/UVES observations of GRB060418
  60. GRB 060418: PROMPT Detections
  61. GRB060418 : LT optical afterglow observation
  62. GRB 060418: REM candidate afterglow
  63. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  64. GRB060413: Swift/UVOT upper limits
  65. GRB 060413: REM NIR Observations
  66. GRB 060413: Swift detection of a burst
  67. GRB 060403 Optical observations
  68. GRB 060403: MITSuME optical observation
  69. GRB060403: Optical Limit
  70. GRB 060403: Swift/UVOT upper limits
  71. SGR 1900+14: BAT observations
  72. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  73. GRB 060403: Swift detection of a burst
  74. HETE trigger H4044: RTT150 optical observations
  75. GRB060331: Swift/UVOT upper limits
  76. Swift XRT observations of the HETE transient H4043
  77. HETE Trigger 4043: ROTSE-III Optical Limits
  78. H4043, an unusual high-energy transient observed by HETE
  79. GRB 060322: LNA optical limit
  80. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  81. GRB 060323 : WIDGET simultaneous optical observations
  82. GRB 060323: Early optical observation at Xinglong
  83. GRB 060322: Confirmation of Swift XRT afterglow
  84. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  85. GRB060323: NOT optical observations
  86. GRB 060322: IAC80 optical observations
  87. GRB 060322: Swift XRT afterglow candidate
  88. GRB060323: P60 Observations
  89. GRB 060323: Swift/UVOT Observations
  90. GRB 060323: optical afterglow confirmed
  91. GRB060323: NOT observations
  92. GRB 060323: Optical Observations
  93. GRB 060323: Refined analysis of the Swift-BAT burst
  94. GRB 060323: optical observations at TNG
  95. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  96. GRB 060322: Refined analysis of the Swift-BAT burst
  97. GRB060323, optical observation
  98. GRB060323 - SDSS Pre-Burst Observations
  99. GRB 060323: Swift detection of a burst with a possible optical afterglow
  100. GRB 060218/SN 2006aj, LNA optical observation

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