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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"

26499 results found.

  1. GRB100905A: 1.5m OSN upper limit
  2. GRB 100905A: Enhanced Swift-XRT position
  3. GRB 100905A: Swift detection of a burst
  4. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  5. GRB 100901A: Submm observations from SMA
  6. GRB 100902A: GROND observations; afterglow candidate
  7. GRB100902A: Optical upper limits at IAO
  8. GRB10901A: Optical observations at IAO
  9. Konus-Wind observation of GRB 100829A
  10. GRB 100904A: Swift detection of a burst
  11. IPN Triangulation of the very bright GRB 100829A
  12. Tentative redshift of GRB100902A from Swift-XRT data
  13. GRB 100902A: Swift XRT refined analysis
  14. GRB 100902A: Swift/UVOT Upper Limits
  15. GRB 100902A: optical observation at Mt.Terskol
  16. GRB 100901A: optical observation at Mt.Terskol
  17. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  18. GRB 100902A: Enhanced Swift-XRT position
  19. GRB 100901A: ISON-NM optical observations
  20. GRB 100902A: Faulkes Telescope South observations
  21. GRB 100902A: Swift detection of a burst
  22. GRB 100901A: Vega telescope optical afterglow observation
  23. Swift/UVOT Observations of GRB100901A
  24. GRB 100901A: SARA-N observations
  25. GRB100901A: MITSuME Okayama Optical Observation
  26. GRB 100901A: Swift-XRT Team refined analysis
  27. GRB 100901A - NOT optical observation
  28. GRB 100901A: Enhanced Swift-XRT position
  29. GRB 100901A: Swift detection of a burst with an optical afterglow
  30. GRB 100829.9: MASTER Optical Limits
  31. GRB 100823A: optical upper limit
  32. GRB 100814A: Maidanak optical observations
  33. GRB 100823A: optical observations
  34. GRB 100823A: MAXI/GSC detection
  35. GRB 100725B: Mondy optical upper limit
  36. GRB 100725B: Maidanak optical upper limit
  37. GRB100807A: R band observations
  38. GRB 100823A: Swift XRT refined analysis
  39. GRB 100823A - second epoch WHT observations
  40. GRB 100823A: TNG NIR observations
  41. GRB 100823A: Swift/UVOT Upper Limits
  42. GRB 100823A: WHT observations
  43. GRB 100823A: Swift-BAT refined analysis
  44. GRB 100823A: Enhanced Swift-XRT position
  45. GRB 100823A: Swift detection of a burst
  46. GRB 100814A: Suzaku WAM observation of the prompt emission
  47. GRB 100814B: Fermi GBM detection
  48. GRB 100814A: optical observations
  49. GRB 100816A: Fermi GBM observation (correction to GCN 11124)
  50. Konus-Wind observation of GRB 100816A
  51. GRB100816A: MITSuME optical upper limits
  52. GRB 100816A: Fermi GBM observation
  53. GRB 100814A: NOT optical observations
  54. GRB 100816A: NOT optical observations
  55. Konus-Wind observation of GRB 100814A
  56. GRB 100814A : Lulin optical observation
  57. GRB 100816A : Lulin r'-band observation
  58. GRB 100816A: Swift UVOT Observations
  59. GRB100816A Swift-XRT refined analysis
  60. GRB 100816A: Swift-BAT spectral lag results
  61. GRB 100816A: 1.23m CAHA optical observations
  62. GRB 100816A: Enhanced Swift-XRT position
  63. GRB 100816A: Gemini-N imaging
  64. GRB 100816A: TAROT Calern observatory optical detection
  65. GRB 100816A: MASTER Optical Limits
  66. GRB100816A: TNG optical afterglow confirmation.
  67. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  68. GRB 100814A: Fermi GBM observation
  69. GRB 100814A: Submm observations from APEX
  70. GRB 100814A: Swift-XRT refined analysis
  71. Swift/UVOT observations of GRB100814A
  72. GRB 100814A: Enhanced Swift-XRT position
  73. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  74. GRB 100814A: Swift detection of a burst with an optical afterglow
  75. GRB 100805A: the 4-th epoch of SAO RAS optical observations
  76. GRB 100805A: optical observation in CrAO (correction to the GCN 11077 and second epoch)
  77. GRB 100802A: further NOT observation
  78. GRB 100807A: P200 Infrared Observations
  79. GRB 100805A: the 3-rd epoch of SAO RAS optical observations
  80. GRB100807A: optical observation in CrAO
  81. GRB 100805A: optical observation in CrAO
  82. GRB 100805A: 2-nd epoch of SAO RAS optical observations
  83. GRB100807A: MITSuME optical upper limits
  84. GRB 100807A: Swift XRT refined analysis
  85. GRB 100807A: P60 Optical Afterglow Discovery
  86. GRB 100807A: Swift/UVOT Upper Limits
  87. GRB 100805A: SAO RAS optical observations
  88. GRB 100807A: Enhanced Swift-XRT position
  89. GRB 100807A: Swift detection of a burst
  90. GRB 100805A: IAC80 and 1.5m OSN optical observations
  91. GRB 100805A: Early RAPTOR Observations
  92. GRB 100805A: Swift/UVOT Observations of the Optical Afterglow
  93. GRB 100802A: WIYN observations
  94. GRB 100805A: IAC80 BVR-band observations
  95. GRB 100805A: Swift-BAT refined analysis
  96. GRB 100805A: Swift-XRT Refined Analysis
  97. GRB 100805A: GRAS 002 optical observations
  98. Trigger 430975: Swift detection of a possible burst
  99. GRB 100805A: I-band detection from 1.23m CAHA telescope.
  100. GRB 100805A: Enhanced Swift-XRT position

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