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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"

15985 results found.

  1. GRB 100902A: MASTER Optical Early Limit
  2. GRB 100901A: 1.5m OSN BVRI-band observations.
  3. GRB 100901A: ROTSE-III Detection
  4. GRB 100901A: MASTER optical flare at 420s discovery
  5. GRB 100901A: Vega telescope optical afterglow observation
  6. GRB 100901A : HCT optical observations
  7. GRB 100901A: THO optical observations
  8. GRB100901A: MITSuME Okayama Optical Observation
  9. GRB 100901A - NOT optical observation
  10. GRB 100901A: optical observation at Mt.Terskol
  11. GRB 100901A: optical observation at Mt.Terskol
  12. GRB 100901A: Gemini-N Redshift
  13. GRB 100901A: MASTER Optical Early Limits
  14. GRB 100901A: Swift detection of a burst with an optical afterglow
  15. GRB 100829.9: MASTER Optical Limits
  16. GRB 100823A: optical upper limit
  17. GRB 100814A: Maidanak optical observations
  18. GRB 100823A: optical observations
  19. GRB 100725B: Mondy optical upper limit
  20. GRB 100725B: Maidanak optical upper limit
  21. GRB100823A : MOA optical observation
  22. GRB 100823A: Swift/UVOT Upper Limits
  23. GRB 100814A: ISON-NM optical observations
  24. GRB 100814A: optical observations
  25. GRB100816A: MITSuME optical upper limits
  26. GRB 100816A: 10.4-m GTC redshift confirmation
  27. GRB 100814A : Liverpool Telescope Observations
  28. GRB 100814A: NOT optical observations
  29. GRB 100816A: NOT optical observations
  30. GRB 100814A : Lulin optical observation
  31. GRB 100816A: Swift UVOT Observations
  32. GRB 100816A: 1.23m CAHA optical observations
  33. GRB100814A - interesting UVOT lightcurve.
  34. GRB 100816A: TAROT Calern observatory optical detection
  35. GRB 100816A: MASTER Optical Limits
  36. GRB100816A: TNG optical afterglow confirmation.
  37. GRB 100816A: ROTSE-III Optical Limits
  38. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  39. Swift/UVOT observations of GRB100814A
  40. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  41. GRB 100814A: IAC80 R-band observations
  42. GRB 100814A: Swift UVOT observations of the optical afterglow
  43. GRB 100814A: Swift detection of a burst with an optical afterglow
  44. GRB 100814A: ROTSE-III Detection of Optical Counterpart
  45. GRB 100805A: the 4-th epoch of SAO RAS optical observations
  46. GRB 100805A: optical observation in CrAO (correction to the GCN 11077 and second epoch)
  47. GRB 100805A: Swift/UVOT Observations of a Possible Late-Time Brightening
  48. GRB 100807A: P200 Infrared Observations
  49. GRB 100805A: the 3-rd epoch of SAO RAS optical observations
  50. GRB100807A: optical observation in CrAO
  51. GRB 100805A: optical observation in CrAO
  52. GRB 100805A: 2-nd epoch of SAO RAS optical observations
  53. GRB100807A: MITSuME optical upper limits
  54. GRB 100807A: P60 Optical Afterglow Discovery
  55. GRB 100807A: Swift/UVOT Upper Limits
  56. GRB 100805A: SAO RAS optical observations
  57. GRB 100807A: ROTSE-III Optical Limits
  58. GRB 100805A: IAC80 and 1.5m OSN optical observations
  59. GRB 100805A: Xinglong TNT optical observation
  60. GRB 100805A: ROTSE-III Optical detection
  61. GRB 100805A: Swift/UVOT Observations of the Optical Afterglow
  62. GRB 100805A: IAC80 BVR-band observations
  63. GRB 100805A: GRAS 002 optical observations
  64. GRB 100805A: I-band detection from 1.23m CAHA telescope.
  65. GRB 100805A: Liverpool Telescope afterglow observations
  66. GRB 100805A: Further P60 Monitoring
  67. GRB 100805A: P60 Optical Afterglow Candidate
  68. GRB 100805A: ROTSE-III Optical Limits
  69. GRB 100805A: Swift detection of a burst with an optical counterpart
  70. GRB 100728B: optical photometry of ISON-NM
  71. GRB 100713A: second epoch Maidanak optical observation
  72. GRB 100713A: CrAO optical limits
  73. GRB 100802A: NOT optical observation
  74. GRB100802A: MITSuME optical upper limits
  75. GRB 100802A: Swift/UVOT Possible Optical Afterglow
  76. GRB 100802A: ROTSE-III Optical Limits
  77. GRB 100802A: Possible Swift/UVOT Detection of Optical Afterglow
  78. GRB 100725B: TELMA optical observation
  79. GRB 100728B - NOT optical observation
  80. GRB 100728B: Swift/UVOT Observations
  81. GRB 100728A: GROND Detection of the NIR Afterglow Candidate
  82. GRB 100728B: optical detection
  83. GRB 100728B: Skynet/PROMPT Detections (correction)
  84. GRB 100728B: KAIT optical afterglow detection (correction)
  85. GRB 100728B: Swift detection of a burst with an optical counterpart
  86. GRB 100728A: KAIT optical afterglow detection
  87. GRB100727A: MOA optical upper limit
  88. GRB100725B: MITSuME optical upper limits
  89. GRB 100725A: GROND upper limits
  90. GRB 100725B: Swift/UVOT Upper Limits
  91. GRB 100725A: Swift/UVOT Upper Limits
  92. GRB 100724A: X-shooter redshift
  93. GRB 100614A: 10.4-m GTC deep-optical limit
  94. GRB 100718A: MASTER-Net optical prompt and alert observations
  95. GRB 100713A: optical observation in Maidanak
  96. GRB100713A: Swift/UVOT observations
  97. GRB 100713A: optical upper limit
  98. GRB 100713A: TNG optical observations
  99. GRB 100713A: TELMA and 1.5m OSN optical observations
  100. GRB 100704: Swift/UVOT Upper Limits

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