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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"

2983 results found.

  1. GRB 070611: ROTSE-III Optical Limits
  2. GRB 070611: Swift detection of a burst
  3. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  4. GRB 070521, Swift-BAT refined analysis
  5. GRB 070521: optical limit by Pi of the Sky
  6. GRB 070518: Swift-XRT refined analysis
  7. GRB 070512: IPN localization and Konus spectrum of a bright burst
  8. GRB 070509: ROTSE-III Optical Limits
  9. GRB 070508, Swift-BAT refined analysis
  10. GRB 070427: Swift detection of a burst
  11. GRB 070420 Swift-BAT Refined Analysis
  12. GRB 070419A: MARGE Observations
  13. GRB 070411: Swift detection of a burst with optical afterglow
  14. GRB 070330, Swift-BAT refined analysis
  15. GRB 070330 - Watcher Observations
  16. Short-Hard GRB 070209: PROMPT Observations
  17. GRB 070318, Swift-BAT refined analysis
  18. GRB 070318: Swift detection of a burst with an optical afterglow
  19. GRB 070306: IR observations and candidate afterglow
  20. GRB 070306: Optical and IR observations with KANATA
  21. VLA observation of GRB 070223
  22. Konus-Wind and Konus-A observations of GRB 070220
  23. GRB 070220: MITSuME Okayama Optical Observation
  24. GRB070208 - SDSS Pre-Burst Observations
  25. GRB 070208: Early IR detection and afterglow astrometry
  26. GRB070208: Faulkes Telescope North Afterglow Identification
  27. GRB 070208: Swift detection of a burst
  28. GRB070129: MITSuME optical observation
  29. GRB 070129: Swift detection of a burst
  30. Swift-BAT trigger 257213 is a Galactic Center transient
  31. Trigger 255685: Swift detection of a possible burst
  32. GRB 070110: Swift detection of a burst with a possible optical afterglow
  33. Retractions of previous Swift-BAT triggers
  34. GRB 061217, Swift-BAT refined analysis
  35. GRB 061213: MASTER-VWF-Kislovodsk optical candidate
  36. GRB 060926: MASTER: discovery of the optical flare
  37. GRB 061126: Early Detection of the IR Afterglow
  38. GRB 061121: MDM Optical Decay
  39. GRB 061121: MDM Optical Observations
  40. GRB 061121: Swift detection of a bright burst with an optical counterpart
  41. GRB 061007: Third Epoch ATCA Radio Observations
  42. GRB 061021: Swift-XRT refined analysis
  43. GRB 061021: Swift/UVOT Observation
  44. GRB 061021, Swift-BAT refined analysis
  45. GRB 061021: Swift detection of a burst
  46. Konus-Wind observation of GRB 060928
  47. GRB 060929: MASTER-VWF-Kislovodsk observations
  48. GRB 060927, Swift-BAT refined analysis
  49. GRB 060926: MASTER: first minutes decay
  50. GRB 060926: Swift-UVOT Detections
  51. GRB 060926: MASTER OT alert observation
  52. GRB 060926: MASTER optical observation
  53. GRB 060926: Swift detection of a burst
  54. GRB 060923C, Swift-BAT partial refined analysis
  55. GRB 060923: KAIT observations
  56. GRB060912: Swift/UVOT Observations
  57. GRB 060912: Correction to GCN 5559
  58. GRB 060912: Swift detection of a burst with an optical afterglow
  59. GRB 060908: Swift detection of a burst with a bright optical counterpart
  60. GRB 060904A: Suzaku-XIS and -HXD observation plan
  61. GRB 060904A: P60 Observations
  62. GRB060904 - SDSS Pre-Burst Observations
  63. GRB 060904: Swift detection of a bright burst
  64. Two bright bursts from SGR 1806-20 detected with IBAS
  65. GRB 060825: Swift-BAT Refined Analysis
  66. GRB 060825: Swift detection of a burst
  67. Konus-Wind observation of GRB 060814
  68. GRB 060813: Refined analysis of the Swift-BAT burst
  69. IPN triangulation of GRB060805B
  70. GRB 060728: Upper limits of the X-ray emission
  71. GRB 060522: VLA observation
  72. GRB 060717: Swift XRT refined position
  73. GRB 060717: Swift detection of a burst
  74. Swift trigger 219136 is probably not a GRB
  75. GRB 060707: Refined analysis of the Swift-BAT burst
  76. GRB 060610: KAIT observations
  77. GRB 060522: PROMPT Optical Limits
  78. GRB 060505: X-ray afterglow - Correction -
  79. GRB 060505: X-ray afterglow
  80. GRB 060510: Swift detection of a burst with optical transient
  81. GRB 060507: MDM Optical Upper Limit
  82. GRB060425: new MASTER survey method
  83. GRB 060505: Swift XRT afterglow canditate position
  84. GRB 060502B: Swift/UVOT upper limits
  85. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  86. GRB 060428B: Refined analysis of the Swift-BAT burst
  87. GRB 060428B: KAIT observations
  88. GRB060425:MASTER optical limit
  89. GRB060425:MASTER survey observations
  90. GRB 060425: IPN localization and KW spectrum of a short, hard burst
  91. GRB 060421: TTT Observations
  92. Konus-Wind observation of GRB 060418
  93. GRB 060322: Confirmation of Swift XRT afterglow
  94. GRB060211B: optical observation
  95. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  96. GRB 060322: Refined analysis of the Swift-BAT burst
  97. GRB 060319: Swift detection of a burst
  98. GRB 060312: Refined analysis of the Swift-BAT burst
  99. GRB 060312: ROTSE-III Optical Limits
  100. GRB 060218/SN 2006aj: WIRO optical observations

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