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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"

2976 results found.

  1. GRB 070509: ROTSE-III Optical Limits
  2. GRB 070508, Swift-BAT refined analysis
  3. GRB 070427: Swift detection of a burst
  4. GRB 070420 Swift-BAT Refined Analysis
  5. GRB 070419A: MARGE Observations
  6. GRB 070411: Swift detection of a burst with optical afterglow
  7. GRB 070330, Swift-BAT refined analysis
  8. GRB 070330 - Watcher Observations
  9. Short-Hard GRB 070209: PROMPT Observations
  10. GRB 070318, Swift-BAT refined analysis
  11. GRB 070318: Swift detection of a burst with an optical afterglow
  12. GRB 070306: IR observations and candidate afterglow
  13. GRB 070306: Optical and IR observations with KANATA
  14. VLA observation of GRB 070223
  15. Konus-Wind and Konus-A observations of GRB 070220
  16. GRB 070220: MITSuME Okayama Optical Observation
  17. GRB070208 - SDSS Pre-Burst Observations
  18. GRB 070208: Early IR detection and afterglow astrometry
  19. GRB070208: Faulkes Telescope North Afterglow Identification
  20. GRB 070208: Swift detection of a burst
  21. GRB070129: MITSuME optical observation
  22. GRB 070129: Swift detection of a burst
  23. Swift-BAT trigger 257213 is a Galactic Center transient
  24. Trigger 255685: Swift detection of a possible burst
  25. GRB 070110: Swift detection of a burst with a possible optical afterglow
  26. Retractions of previous Swift-BAT triggers
  27. GRB 061217, Swift-BAT refined analysis
  28. GRB 061213: MASTER-VWF-Kislovodsk optical candidate
  29. GRB 060926: MASTER: discovery of the optical flare
  30. GRB 061126: Early Detection of the IR Afterglow
  31. GRB 061121: MDM Optical Decay
  32. GRB 061121: MDM Optical Observations
  33. GRB 061121: Swift detection of a bright burst with an optical counterpart
  34. GRB 061007: Third Epoch ATCA Radio Observations
  35. GRB 061021: Swift-XRT refined analysis
  36. GRB 061021: Swift/UVOT Observation
  37. GRB 061021, Swift-BAT refined analysis
  38. GRB 061021: Swift detection of a burst
  39. Konus-Wind observation of GRB 060928
  40. GRB 060929: MASTER-VWF-Kislovodsk observations
  41. GRB 060927, Swift-BAT refined analysis
  42. GRB 060926: MASTER: first minutes decay
  43. GRB 060926: Swift-UVOT Detections
  44. GRB 060926: MASTER OT alert observation
  45. GRB 060926: MASTER optical observation
  46. GRB 060926: Swift detection of a burst
  47. GRB 060923C, Swift-BAT partial refined analysis
  48. GRB 060923: KAIT observations
  49. GRB060912: Swift/UVOT Observations
  50. GRB 060912: Correction to GCN 5559
  51. GRB 060912: Swift detection of a burst with an optical afterglow
  52. GRB 060908: Swift detection of a burst with a bright optical counterpart
  53. GRB 060904A: Suzaku-XIS and -HXD observation plan
  54. GRB 060904A: P60 Observations
  55. GRB060904 - SDSS Pre-Burst Observations
  56. GRB 060904: Swift detection of a bright burst
  57. Two bright bursts from SGR 1806-20 detected with IBAS
  58. GRB 060825: Swift-BAT Refined Analysis
  59. GRB 060825: Swift detection of a burst
  60. Konus-Wind observation of GRB 060814
  61. GRB 060813: Refined analysis of the Swift-BAT burst
  62. IPN triangulation of GRB060805B
  63. GRB 060728: Upper limits of the X-ray emission
  64. GRB 060522: VLA observation
  65. GRB 060717: Swift XRT refined position
  66. GRB 060717: Swift detection of a burst
  67. Swift trigger 219136 is probably not a GRB
  68. GRB 060707: Refined analysis of the Swift-BAT burst
  69. GRB 060610: KAIT observations
  70. GRB 060522: PROMPT Optical Limits
  71. GRB 060505: X-ray afterglow - Correction -
  72. GRB 060505: X-ray afterglow
  73. GRB 060510: Swift detection of a burst with optical transient
  74. GRB 060507: MDM Optical Upper Limit
  75. GRB060425: new MASTER survey method
  76. GRB 060505: Swift XRT afterglow canditate position
  77. GRB 060502B: Swift/UVOT upper limits
  78. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  79. GRB 060428B: Refined analysis of the Swift-BAT burst
  80. GRB 060428B: KAIT observations
  81. GRB060425:MASTER optical limit
  82. GRB060425:MASTER survey observations
  83. GRB 060425: IPN localization and KW spectrum of a short, hard burst
  84. GRB 060421: TTT Observations
  85. Konus-Wind observation of GRB 060418
  86. GRB 060322: Confirmation of Swift XRT afterglow
  87. GRB060211B: optical observation
  88. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  89. GRB 060322: Refined analysis of the Swift-BAT burst
  90. GRB 060319: Swift detection of a burst
  91. GRB 060312: Refined analysis of the Swift-BAT burst
  92. GRB 060312: ROTSE-III Optical Limits
  93. GRB 060218/SN 2006aj: WIRO optical observations
  94. GRB 060213: IPN localization
  95. GRB 060211A: Further refined analysis of the Swift burst
  96. GRB060105: optical observations
  97. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  98. GRB 050826: Optical Afterglow and Host Galaxy
  99. GRB 060211B: Swift/BAT refined analysis
  100. GRB060211.7: MASTER_optical_observation under the snow

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