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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"

35256 results found.

  1. GRB 060502B: AROMA optical observations
  2. GRB 060502B: Refined analysis of the Swift-BAT short burst
  3. Short GRB 060502B: Tautenburg Observation
  4. GRB 060427B Milagro GeV/TeV Observations
  5. GRB 060502A: TTT Observations
  6. GRB 060501: P60 Observations and Candidate Retraction
  7. GRB 060502B: Xinglong optical observation
  8. GRB 060502B: MASTER optical observations
  9. GRB 060502B: Swift detection of a short burst
  10. GRB 060502: Swift-BAT refined analysis
  11. GRB060502: Gemini spectroscopy
  12. GRB 060502: APO Spectroscopic Observations
  13. GRB 060502: P60 Afterglow Confirmation
  14. GRB 060502: Swift detection of a burst with an optical counterpart
  15. GRB 060501: MDM Observations
  16. GRB060501: Super-LOTIS observations
  17. GRB 060501: Refined analysis of the Swift-BAT burst
  18. GRB060501: Swift XRT position
  19. GRB 060501: ROTSE-III Optical Limits
  20. GRB 060501: Swift detection of a burst
  21. IPN triangulation of GRB060429 (short/hard)
  22. Konus-Wind observation of GRB 060427B
  23. GRB060428B - SDSS Pre-Burst Observations
  24. GRB060428B: optical observation
  25. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  26. GRB 060428B: MDM Observations
  27. GRB 060428A: PROMPT Observations
  28. GRB 060427B: MASTER optical observations
  29. GRB 060427B: IPN localization of a short hard burst
  30. GRB 060428B: Refined analysis of the Swift-BAT burst
  31. GRB 060428B: Xinglong I-band limit
  32. GRB 060428B: KAIT observations
  33. GRB060425:MASTER optical limit
  34. GRB 051117A: Bright host galaxy not confirmed
  35. GRB 060428A: Refined analysis of the Swift-BAT burst
  36. GRB 060428b : Kiso R-band limit
  37. GRB060427:MASTER optical limit
  38. GRB 060428b: Optical afterglow candidate
  39. GRB 060428B: Swift detection of a burst
  40. GRB 060427: NIR observations
  41. GRB 060428: Swift detection of a burst
  42. GRB 060427: NOT observations
  43. GRB 060427: Swift/UVOT upper limits.
  44. GRB 060427: Refined analysis of the Swift-BAT burst
  45. GRB060418: Swift XRT Team Further Refined Analysis
  46. GRB060425:MASTER survey observations
  47. GRB 060427, optical observation
  48. GRB 060427: Swift detection of a burst
  49. GRB 060425: IPN localization and KW spectrum of a short, hard burst
  50. An interactive program for GRB pseudo-redshift computations
  51. GRB060424: optical afterglow detection
  52. GRB060418: Further Analysis of MIKE Spectroscopy
  53. GRB 060424: Refined analysis of the Swift-BAT burst
  54. GRB 060424: Swift detection of a burst
  55. GRB 060421: TTT Observations
  56. GRB 060421: Swift-BAT Refined Analysis
  57. GRB 060421: Swift-XRT refined analysis
  58. GRB 060418: prediction of t_break
  59. GRB060418: optical observations
  60. Konus-Wind observation of GRB 060418
  61. GRB(?)060421:MASTER optical limit
  62. GRB(?)060421 : XRT position
  63. GRB(?) 060421: Swift detection of a burst
  64. Erratum of GCN 4983 for GRB 060418 IR follow-up
  65. GRB 060418 : IR afterglow observations
  66. GRB 060418 : Lulin Optical follow-up
  67. GRB 060418: JHKs PAIRITEL Observations of Afterglow
  68. GRB 060418: Radio Observations
  69. GRB060418, BVRcIc field calibration
  70. GRB060418: Optical Observations
  71. GRB 060418: FRAM early afterglow observation
  72. GRB 060418: Refined Analysis of the Swift-BAT burst
  73. GRB060418: Swift XRT Team Refined Analysis
  74. GRB 060418, SMARTS continuing afterglow observations
  75. GRB 060418: PROMPT Detections
  76. GRB 060418, SMARTS optical/IR afterglow observations
  77. GRB060418: Magellan/MIKE Spectroscopic Redshift
  78. GRB060418 : LT optical afterglow observation
  79. GRB 060418: REM candidate afterglow
  80. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  81. GRB 060413: REM NIR Observations
  82. GRB 060413: Refined analysis of the Swift-BAT burst
  83. GRB 060413: Watcher UBVR observations
  84. GRB 060413: XRT refined analysis
  85. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  86. GRB 060413: Swift detection of a burst
  87. GRB060403: optical observations
  88. GRB 060403 Optical observations
  89. GRB 060403: MITSuME optical observation
  90. GRB060403: XRT refined analysis
  91. GRB 060403: Swift/UVOT upper limits
  92. GRB 060403: Refined analysis of the Swift-BAT burst
  93. GRB 060403: Swift detection of a burst
  94. GRB 060322: LNA optical limit
  95. GRB 060218SN 2006aj: optical observations at Rozhen Observatory
  96. GRB 060323 : WIDGET simultaneous optical observations
  97. GRB 060323: Early optical observation at Xinglong
  98. GRB060218, optical observations
  99. GRB 060322: Confirmation of Swift XRT afterglow
  100. GRB 060211A: optical observation

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