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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"

19090 results found.

  1. GRB 061110: ROTSE-III Optical Limits
  2. GRB 061110: Swift detection of a burst
  3. GRB061110A - Optical Non-detection
  4. GRB 061109: TAROT Calern observatory optical observations
  5. GRB 061027: TAROT La Silla observatory optical observations
  6. GRB 061028: Swift/XRT Astrometry Correction
  7. GRB 061102: Swift/UVOT Magnitude Upper Limits
  8. GRB061102B: Super-LOTIS observations
  9. GRB 061028: Optical R passband observations
  10. GRB 061102B: Swift detection of a possible burst
  11. GRB 061102: Swift detection of a burst
  12. GRB 061028: VLA Observation
  13. GRB 061004: Swift/XRT Astrometry Correction
  14. GRB 060801: Swift/XRT Astrometry Correction
  15. GRB 061028: Futher P200 Observations
  16. GRB 061028: P200 Observations
  17. GRB 061028: SARA upper limit
  18. GRB 061028: z band imaging
  19. GRB061028: XRT refined analysis
  20. GRB 061028: Swift/UVOT Observations
  21. GRB 061028: TAROT Calern observatory optical observations
  22. GRB 061028: Swift detection of a burst
  23. GRB 061027, Swift refined analysis of a possible burst
  24. GRB 061027: Swift detection of a possible burst
  25. GRB061025: Swift/UVOT observations
  26. GRB 061025: REM observations
  27. GRB 061025: ROTSE-III Optical Limits
  28. GRB 061021: Swift/UVOT Observation
  29. GRB 061021: Swift detection of a burst
  30. GRB 061019: SARA upper limit
  31. GRB 061019: Swift/UVOT upper limit
  32. GRB 061019: TAROT La Silla observatory optical observations
  33. GRB 061019: REM K-band candidate afterglow
  34. GRB 061006: astrometry-corrected XRT position
  35. GRB 061007: ATCA Radio Observations
  36. GRB061007: Swift UVOT followup observations
  37. GRB 061006: optical afterglow
  38. GRB 061007: OA fading and VLT redshift
  39. GRB 061007: Magellan Spectroscopy
  40. GRB 061006: Swift/UVOT optical observations
  41. GRB 061007: Swift detection of a burst with an optical counterpart
  42. GRB 061006: VLT observation
  43. GRB 060930: near-IR afterglow candidate retraction
  44. GRB 061006: Swift detection of a burst
  45. GRB 061004: Optical afterglow candidate and redshift
  46. GRB 061004, Swift BAT refined analysis
  47. GRB 061004: Swift detection of a burst
  48. Konus-Wind observation of GRB 060928
  49. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  50. GRB 060928: Swift observations
  51. IPN triangulation of GRB060928 (long, exceptionally bright)
  52. GRB 060930: near-IR afterglow candidate
  53. VLA observations of GRB 060926
  54. GRB061002 - SDSS Pre-Burst Observations
  55. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  56. GRB 061002: Swift detection of a burst
  57. GRB 060908: Detection of a possible host
  58. GRB 060807: Detection of a possible host galaxy
  59. GRB 060923A: VLA K-band Observations
  60. GRB 060930: Xinglong TNT optical observations
  61. GRB 060929: Swift/UVOT Optical Observations
  62. GRB 060930: A long X-ray rich GRB detected by INTEGRAL
  63. GRB 060929: TNG K-band observations
  64. GRB060929: Optical limit
  65. Liverpool Telescope observations of GRB 060929
  66. GRB060908: optical observations
  67. GRB 060927: Swift/UVOT Optical Observations
  68. GRB 060927: Swift XRT Team refined analysis
  69. GRB 060927 optical limit
  70. GRB 060927: Xinglong TNT optical observations
  71. GRB 060927, optical observation
  72. GRB060927 - SDSS Pre-Burst Observations
  73. GRB060926: VLT redshift
  74. GRB 060926: Swift-UVOT Detections
  75. GRB 060923A: Radio Observations
  76. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  77. GRB 060923C: VLA Observation
  78. GRB 060923C: NIR afterglow confirmed
  79. GRB060923C: AROMA optical obsevation
  80. GRB 060923C, optical observation
  81. GRB 060923C: VLT J-band observations
  82. GRB 060923A: Keck and Gemini Observations
  83. GRB 060923C: Xinglong TNT optical observations
  84. GRB 060923C: Swift detection of a burst
  85. GRB 060923B: Swift detection of a burst
  86. GRB 060923: UKIRT nIR observations - candidate afterglow
  87. GRB060923 - SDSS Pre-Burst Observations
  88. GRB 060923: Swift detection of a burst
  89. GRB 060919 : Faulkes South Telescope Observations
  90. GRB 060919: TAROT optical observations
  91. GRB 060919: Swift detection of a burst
  92. GRB 060912A: VLA Observation
  93. GRB 060912A: Probable Host Galaxy
  94. Konus-Wind observation of GRB 060912
  95. GRB 060912: Correction to GCN 5559
  96. GRB060906: Danish/DFOSC optical observations
  97. VLA observations of GRB 060908
  98. GRB 060908 - SDSS Pre-burst Observations
  99. GRB 060908: REM optical prompt observation
  100. GRB 060908: Swift detection of a burst with a bright optical counterpart

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