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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"

36137 results found.

  1. GRB 100915A: Swift detection of a likely burst
  2. GRB 100910A: Fermi GBM detection
  3. Swift-BAT trigger 433953 is not a burst
  4. Swift BAT Trigger 433953 probably not a GRB
  5. GRB100909A: MITSuME Ishigakijima Optical upper limits
  6. GRB 100909A: Swift/UVOT observations
  7. GRB 100901A: errata of GRB name in GCN 11270
  8. GRB 100901A: optical observations in Mondy and R-light curve
  9. GRB 100909A: Swift-XRT refined analysis
  10. GRB 100906A: optical observations at Mt.Terskol
  11. GRB 100901A: optical observation in Maidanak, break confirmation
  12. GRB 100909A: Faulkes Telescope North afterglow candidate
  13. GRB 100909A: ROTSE-III Optical Limits
  14. GRB 100909A: Planned XMM-Newton observation
  15. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  16. GRB 100909A: Swift target of opportunity observation
  17. GRB 100909A: a long GRB detected by INTEGRAL
  18. GRB100906A: detection at 15GHz
  19. GRB100901A: IAO optical upper limits at 4 days after the burst
  20. EVLA detection of radio afterglow of GRB100901A
  21. GRB 100901A: Confirmation of WSRT Radio Detection
  22. GRB 100901A: CrAO optical observations
  23. GRB 100906A: RTT150 optical observations
  24. GRB 100906A: GRAS-007 optical observations
  25. GRB100906A: R band observations
  26. Konus-Wind observation of GRB 100906A
  27. GRB100906A: non-detection at 15GHz
  28. GRB100906A: Optical observations at IAO
  29. GRB 100906A: Fermi GBM observation
  30. GRB 100906A: TLS Monitoring
  31. GRB 100901A: TLS Detection at 5.5 days
  32. GRB 100906A: Observations at the Virtual Telescope
  33. GRB 100906A: Swift-XRT refined analysis
  34. GRB 100906A: Enhanced Swift-XRT position
  35. GRB 100906A: Swift/UVOT Observations
  36. GRB100906A: MITSuME Okayama Optical Observation
  37. GRB 100906A: Ondrejov 65cm observations
  38. GRB 100906A: TLS Multicolor Observations
  39. GRB 100905A: Swift/UVOT Upper Limits
  40. GRB 100901A: TLS observations, SDSS calibration, decay slope
  41. GRB 100906A: MASTER preliminary prompt+afterglow lc
  42. GRB 100901A: ISON-NM optical observations
  43. GRB 100906A: Swift-BAT refined analysis
  44. GRB 100906A: UKIRT zYJHK Observation
  45. GRB 100906A: MASTER preliminary polarization prompt light curve
  46. GRB 100906A: Gemini-N/GMOS redshift
  47. GRB 100906A : Faulkes Telescope North optical observations
  48. GRB 100906A: MASTER early OT observations
  49. GRB 100906A: Swift detection of a burst with an optical afterglow
  50. GRB 100829A: MASTER optical observations
  51. GRB100905A: Optical upper limits at IAO
  52. GRB100905A: MITSuME Okayama optical upper limits
  53. GRB 100905A: Swift-XRT refined analysis.
  54. GRB 100905A: UKIRT zJHK Observation
  55. GRB 100901A: Possible WSRT Radio Detection
  56. GRB 100905A: Enhanced Swift-XRT position
  57. GRB 100905A: Swift-BAT refined analysis
  58. GRB100904A: BOOTES-3 Upper Limit
  59. GRB 100905A: MASTER Prompt Optical Observations
  60. GRB 100905A: Faulkes Telescope North observations
  61. GRB 100905A: Swift detection of a burst
  62. Optical observations of GRB 100901A
  63. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  64. GRB 100901A: Submm observations from SMA
  65. GRB 100902A: UKIRT JK Observation
  66. GRB 100902A: GROND observations; afterglow candidate
  67. GRB 100901A: UKIRT zYJHK Observation
  68. GRB 100904A: Swift-BAT refined analysis
  69. GRB100902A: Optical upper limits at IAO
  70. GRB10901A: Optical observations at IAO
  71. Konus-Wind observation of GRB 100829A
  72. GRB 100904A: Swift detection of a burst
  73. GRB 100902A: Swift-BAT refined analysis
  74. GRB 100901A: optical observation at Mt.Terskol
  75. GRB 100901A: multicolor photometry at Mt.Terskol
  76. IPN Triangulation of the very bright GRB 100829A
  77. GRB 100901A: Lightbuckets Optical Observations
  78. GRB 100901A: HCT optical observations
  79. GRB 100902A: 1.5m OSN I-band Upper Limits
  80. Tentative redshift of GRB100902A from Swift-XRT data
  81. GRB 100902A: Swift XRT refined analysis
  82. GRB 100902A: Swift/UVOT Upper Limits
  83. GRB 100902A: optical observation at Mt.Terskol
  84. GRB 100901A: optical observation at Mt.Terskol
  85. GRB 100901A: Kanata Telescope observation of the optical afterglow
  86. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  87. GRB 100902A: Enhanced Swift-XRT position
  88. GRB 100901A: TLS Observations: Break?
  89. GRB 100902A: MASTER Prompt Optical Observations
  90. GRB 100901A: ISON-NM optical observations
  91. GRB 100902A: Faulkes Telescope South observations
  92. GRB 100902A: MASTER Optical Early Limit
  93. GRB 100902A: Swift detection of a burst
  94. GRB 100901A: 1.5m OSN BVRI-band observations.
  95. GRB 100901A: ROTSE-III Detection
  96. GRB 100901A: MASTER optical flare at 420s discovery
  97. GRB 100901A: Vega telescope optical afterglow observation
  98. Swift/UVOT Observations of GRB100901A
  99. GRB 100901A : HCT optical observations
  100. GRB 100901A: SARA-N observations

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