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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"

35431 results found.

  1. Swift-BAT Trigger 236481 is a Cosmic Ray Shower event
  2. GRB061102B: Super-LOTIS observations
  3. GRB 061028: Optical R passband observations
  4. GRB 061102B: Swift detection of a possible burst
  5. GRB 061102, Swift-BAT refined analysis
  6. GRB 061102: Swift detection of a burst
  7. GRB 061028: VLA Observation
  8. GRB 061004: Swift/XRT Astrometry Correction
  9. GRB 060801: Swift/XRT Astrometry Correction
  10. GRB 061028: Futher P200 Observations
  11. GRB 061028: MDM Observations
  12. GRB 061028: P200 Observations
  13. GRB 061028: SARA upper limit
  14. GRB 061028: z band imaging
  15. GRB061028: XRT refined analysis
  16. GRB 061028: Swift/UVOT Observations
  17. GRB 061028, Swift-BAT refined analysis
  18. GRB 061028: TAROT Calern observatory late optical observations
  19. GRB 061028: TAROT Calern observatory optical observations
  20. GRB 061028: Swift detection of a burst
  21. GRB 061027, Swift refined analysis of a possible burst
  22. GRB 061027: Swift detection of a possible burst
  23. GRB061025: Swift/UVOT observations
  24. GRB 061019: MITSuME upper limits
  25. GRB 061025: REM observations
  26. GRB 061025: Gemini-S observations
  27. GRB061025: Swift XRT position
  28. GRB 061025: ROTSE-III Optical Limits
  29. GRB 061025: a long GRB detected by INTEGRAL
  30. GRB 061021, Swift-BAT Lag analysis
  31. Konus-Wind observation of GRB 061021
  32. GRB 061021 - VLT spectrum without lines
  33. GRB 061021: Swift-XRT refined analysis
  34. GRB 061021: Swift/UVOT Observation
  35. GRB 061021, Swift-BAT refined analysis
  36. GRB 061021: Swift detection of a burst
  37. GRB 061019: Super-LOTIS upper limit
  38. GRB060904b: optical observations
  39. GRB061019: optical observations
  40. GRB061019: optical observations
  41. GRB 061019: SARA upper limit
  42. GRB 061019: dust-scattered X-ray halo detected in Swift/XRT
  43. GRB 060930: MARGE Optical Limits
  44. GRB 061019: Swift/UVOT upper limit
  45. GRB 061019: SMARTS afterglow confirmation
  46. GRB061019: Swift XRT refined analysis
  47. GRB 061019, Swift-BAT refined analysis
  48. GRB 061019: TAROT La Silla observatory optical observations
  49. GRB 061019: REM K-band candidate afterglow
  50. GRB061019: Swift/XRT position
  51. GRB 061019: Swift-BAT detection of a burst
  52. GRB 060825: GORT Observations
  53. GRB 061007: Second Epoch ATCA Radio Observations
  54. GRB 061007: RHESSI Spectral Fit
  55. GRB 061007: Suzaku/WAM observation of the prompt emission
  56. GRB 061006: astrometry-corrected XRT position
  57. Konus-Wind observation of GRB 061007
  58. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  59. GRB 061007: ATCA Radio Observations
  60. GRB 061006: optical afterglow
  61. GRB 061006 : Suzaku/WAM observation of the prompt emission
  62. GRB 061007: OA fading and VLT redshift
  63. GRB 061007: Magellan Spectroscopy
  64. GRB 061007: Correction to GCN 5712
  65. GRB 061007: Swift-BAT refined analysis
  66. GRB 061007: Swift XRT refined analysis
  67. GRB 061006: Swift/UVOT optical observations
  68. Konus-Wind observation of the short hard GRB 061006
  69. GRB 061007 - FTS early brightening and power law decay
  70. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  71. GRB 061007: Swift detection of a burst with an optical counterpart
  72. GRB 061007: ROTSE-III Detection of Optical Counterpart
  73. GRB 061006: VLT observation
  74. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  75. GRB 061006: Swift-XRT Team Refined Analysis
  76. GRB061006 (Swift 232585) might be a short-hard GRB
  77. GRB 060930: near-IR afterglow candidate retraction
  78. GRB061006: Faulkes Telescope South Observations
  79. GRB 061006: Swift detection of a burst
  80. GRB 061004: Optical afterglow candidate and redshift
  81. GRB 061004: Las Campanas Optical/NIR Observations
  82. GRB 061004: Swift-XRT Team Refined Analysis
  83. GRB 061004, Swift BAT refined analysis
  84. GRB 061004: Nearby 2MASS Galaxy
  85. GRB 060928: Correction to GCN 5690
  86. GRB 061004: Swift detection of a burst
  87. GRB 060928: 2 pseudo-z from 2 detections spectral parameters
  88. Konus-Wind observation of GRB 060928
  89. GRB 060928: Suzaku/WAM observation of the prompt emission
  90. GRB 060928: Swift observations
  91. GRB 060928: RHESSI Spectral Fit
  92. IPN triangulation of GRB060928 (long, exceptionally bright)
  93. GRB 060930: near-IR afterglow candidate
  94. GRB 061002: Swift-XRT Team Refined Analysis
  95. VLA observations of GRB 060926
  96. GRB061002 - SDSS Pre-Burst Observations
  97. GRB 061002, Swift-BAT refined analysis
  98. GRB061002: MASTER-VWF-Kislovodsk observations
  99. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  100. GRB 061002: Swift detection of a burst

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