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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"

3612 results found.

  1. GRB 071112C: Swift detection of a burst with an optical counterpart
  2. GRB071101: Optical and NIR upper limits by KANATA
  3. GRB071028: Xinglong EST V-band upper limit
  4. GRB071021: MARGE Optical Limits
  5. GRB071020, optical upper limit
  6. GRB071021: MITSuME Okayama Optical Upper Limits
  7. GRB 071018: Swift-XRT observation
  8. GRB 071011, Swift-BAT refined analysis
  9. GRB 071010B, Swift-BAT refined analysis
  10. GRB071008: Swift-XRT observation
  11. GRB 071003, Swift-BAT refined analysis
  12. GRB 071003: Swift detection of a bright burst
  13. Recent SGR1806-20 Activity
  14. GRB 070920B, Swift-BAT refined analysis
  15. GRB 070920: TAROT Calern observatory optical observations
  16. GRB 070911: Swift detection of a burst
  17. GRB070805 XRT and UVOT afterglow candidate
  18. GRB 070805, Swift-BAT refined analysis
  19. GRB 070724B: Swift-XRT afterglow confirmation
  20. GRB 070724B: Swift-XRT afterglow likely candidate
  21. GRB 070724B: Swift-XRT afterglow candidates
  22. Swift XRT observation of GRB 070707
  23. GRB 070704: Swift detection of a burst
  24. GRB 070628: NIR detection of afterglow
  25. OT20050728 was not an optical GRB afterglow
  26. GRB 070621: Gemini South optical imaging
  27. GRB 070616: BTA optical observations
  28. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  29. GRB 070610: Watcher Observations
  30. GRB 070611: ROTSE-III Optical Limits
  31. GRB 070611: Swift detection of a burst
  32. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  33. GRB 070521, Swift-BAT refined analysis
  34. GRB 070521: optical limit by Pi of the Sky
  35. GRB 070518: Swift-XRT refined analysis
  36. GRB 070512: IPN localization and Konus spectrum of a bright burst
  37. GRB 070509: ROTSE-III Optical Limits
  38. GRB 070508, Swift-BAT refined analysis
  39. GRB 070427: Swift detection of a burst
  40. GRB 070420 Swift-BAT Refined Analysis
  41. GRB 070419A: MARGE Observations
  42. GRB 070411: Swift detection of a burst with optical afterglow
  43. GRB 070330, Swift-BAT refined analysis
  44. GRB 070330 - Watcher Observations
  45. Short-Hard GRB 070209: PROMPT Observations
  46. GRB 070318, Swift-BAT refined analysis
  47. GRB 070318: Swift detection of a burst with an optical afterglow
  48. GRB 070306: IR observations and candidate afterglow
  49. GRB 070306: Optical and IR observations with KANATA
  50. VLA observation of GRB 070223
  51. Konus-Wind and Konus-A observations of GRB 070220
  52. GRB 070220: MITSuME Okayama Optical Observation
  53. GRB070208 - SDSS Pre-Burst Observations
  54. GRB 070208: Early IR detection and afterglow astrometry
  55. GRB070208: Faulkes Telescope North Afterglow Identification
  56. GRB 070208: Swift detection of a burst
  57. GRB070129: MITSuME optical observation
  58. GRB 070129: Swift detection of a burst
  59. Swift-BAT trigger 257213 is a Galactic Center transient
  60. Trigger 255685: Swift detection of a possible burst
  61. GRB 070110: Swift detection of a burst with a possible optical afterglow
  62. Retractions of previous Swift-BAT triggers
  63. GRB 061217, Swift-BAT refined analysis
  64. GRB 061213: MASTER-VWF-Kislovodsk optical candidate
  65. GRB 060926: MASTER: discovery of the optical flare
  66. GRB 061126: Early Detection of the IR Afterglow
  67. GRB 061121: MDM Optical Decay
  68. GRB 061121: MDM Optical Observations
  69. GRB 061121: Swift detection of a bright burst with an optical counterpart
  70. GRB 061007: Third Epoch ATCA Radio Observations
  71. GRB 061021: Swift-XRT refined analysis
  72. GRB 061021: Swift/UVOT Observation
  73. GRB 061021, Swift-BAT refined analysis
  74. GRB 061021: Swift detection of a burst
  75. Konus-Wind observation of GRB 060928
  76. GRB 060929: MASTER-VWF-Kislovodsk observations
  77. GRB 060927, Swift-BAT refined analysis
  78. GRB 060926: MASTER: first minutes decay
  79. GRB 060926: Swift-UVOT Detections
  80. GRB 060926: MASTER OT alert observation
  81. GRB 060926: MASTER optical observation
  82. GRB 060926: Swift detection of a burst
  83. GRB 060923C, Swift-BAT partial refined analysis
  84. GRB 060923: KAIT observations
  85. GRB060912: Swift/UVOT Observations
  86. GRB 060912: Correction to GCN 5559
  87. GRB 060912: Swift detection of a burst with an optical afterglow
  88. GRB 060908: Swift detection of a burst with a bright optical counterpart
  89. GRB 060904A: Suzaku-XIS and -HXD observation plan
  90. GRB 060904A: P60 Observations
  91. GRB060904 - SDSS Pre-Burst Observations
  92. GRB 060904: Swift detection of a bright burst
  93. Two bright bursts from SGR 1806-20 detected with IBAS
  94. GRB 060825: Swift-BAT Refined Analysis
  95. GRB 060825: Swift detection of a burst
  96. Konus-Wind observation of GRB 060814
  97. GRB 060813: Refined analysis of the Swift-BAT burst
  98. IPN triangulation of GRB060805B
  99. GRB 060728: Upper limits of the X-ray emission
  100. GRB 060522: VLA observation

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