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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"

36313 results found.

  1. GRB 061028: TAROT Calern observatory optical observations
  2. GRB 061028: Swift detection of a burst
  3. GRB 061027, Swift refined analysis of a possible burst
  4. GRB 061027: Swift detection of a possible burst
  5. GRB061025: Swift/UVOT observations
  6. GRB 061019: MITSuME upper limits
  7. GRB 061025: REM observations
  8. GRB 061025: Gemini-S observations
  9. GRB061025: Swift XRT position
  10. GRB 061025: ROTSE-III Optical Limits
  11. GRB 061025: a long GRB detected by INTEGRAL
  12. GRB 061021, Swift-BAT Lag analysis
  13. Konus-Wind observation of GRB 061021
  14. GRB 061021 - VLT spectrum without lines
  15. GRB 061021: Swift-XRT refined analysis
  16. GRB 061021: Swift/UVOT Observation
  17. GRB 061021, Swift-BAT refined analysis
  18. GRB 061021: Swift detection of a burst
  19. GRB 061019: Super-LOTIS upper limit
  20. GRB060904b: optical observations
  21. GRB061019: optical observations
  22. GRB061019: optical observations
  23. GRB 061019: SARA upper limit
  24. GRB 061019: dust-scattered X-ray halo detected in Swift/XRT
  25. GRB 060930: MARGE Optical Limits
  26. GRB 061019: Swift/UVOT upper limit
  27. GRB 061019: SMARTS afterglow confirmation
  28. GRB061019: Swift XRT refined analysis
  29. GRB 061019, Swift-BAT refined analysis
  30. GRB 061019: TAROT La Silla observatory optical observations
  31. GRB 061019: REM K-band candidate afterglow
  32. GRB061019: Swift/XRT position
  33. GRB 061019: Swift-BAT detection of a burst
  34. GRB 060825: GORT Observations
  35. GRB 061007: Second Epoch ATCA Radio Observations
  36. GRB 061007: RHESSI Spectral Fit
  37. GRB 061007: Suzaku/WAM observation of the prompt emission
  38. GRB 061006: astrometry-corrected XRT position
  39. Konus-Wind observation of GRB 061007
  40. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  41. GRB 061007: ATCA Radio Observations
  42. GRB 061006: optical afterglow
  43. GRB 061006 : Suzaku/WAM observation of the prompt emission
  44. GRB 061007: OA fading and VLT redshift
  45. GRB 061007: Magellan Spectroscopy
  46. GRB 061007: Correction to GCN 5712
  47. GRB 061007: Swift-BAT refined analysis
  48. GRB 061007: Swift XRT refined analysis
  49. GRB 061006: Swift/UVOT optical observations
  50. Konus-Wind observation of the short hard GRB 061006
  51. GRB 061007 - FTS early brightening and power law decay
  52. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  53. GRB 061007: Swift detection of a burst with an optical counterpart
  54. GRB 061007: ROTSE-III Detection of Optical Counterpart
  55. GRB 061006: VLT observation
  56. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  57. GRB 061006: Swift-XRT Team Refined Analysis
  58. GRB061006 (Swift 232585) might be a short-hard GRB
  59. GRB 060930: near-IR afterglow candidate retraction
  60. GRB061006: Faulkes Telescope South Observations
  61. GRB 061006: Swift detection of a burst
  62. GRB 061004: Optical afterglow candidate and redshift
  63. GRB 061004: Las Campanas Optical/NIR Observations
  64. GRB 061004: Swift-XRT Team Refined Analysis
  65. GRB 061004, Swift BAT refined analysis
  66. GRB 061004: Nearby 2MASS Galaxy
  67. GRB 060928: Correction to GCN 5690
  68. GRB 061004: Swift detection of a burst
  69. GRB 060928: 2 pseudo-z from 2 detections spectral parameters
  70. Konus-Wind observation of GRB 060928
  71. GRB 060928: Suzaku/WAM observation of the prompt emission
  72. GRB 060928: Swift observations
  73. GRB 060928: RHESSI Spectral Fit
  74. IPN triangulation of GRB060928 (long, exceptionally bright)
  75. GRB 060930: near-IR afterglow candidate
  76. GRB 061002: Swift-XRT Team Refined Analysis
  77. VLA observations of GRB 060926
  78. GRB061002 - SDSS Pre-Burst Observations
  79. GRB 061002, Swift-BAT refined analysis
  80. GRB061002: MASTER-VWF-Kislovodsk observations
  81. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  82. GRB 061002: Swift detection of a burst
  83. GRB 060908: Detection of a possible host
  84. GRB 060923A: Probable host galaxy in the R-band
  85. GRB 060807: Detection of a possible host galaxy
  86. GRB 060923A: VLA K-band Observations
  87. GRB060930: Faulkes Telescope South observation
  88. GRB 060930: Xinglong TNT optical observations
  89. GRB 060929: Further XRT Refined Analysis
  90. GRB 060929: Swift/UVOT Optical Observations
  91. GRB 060930: ROTSE-III Optical Limits
  92. GRB 060930: A long X-ray rich GRB detected by INTEGRAL
  93. GRB 060927 : GAO 150cm telescope optical observation
  94. GRB060929: Swift-XRT refined analysis.
  95. GRB 060929, Swift-BAT further refined analysis - late-time flare
  96. GRB 060929: TNG K-band observations
  97. GRB 060929, Swift-BAT refined analysis
  98. GRB 060929: BART observation
  99. GRB 060929: MASTER-VWF-Kislovodsk observations
  100. GRB 060929: BOOTES-IR & OSN observations

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