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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"

20361 results found.

  1. GRB 100901A: Possible WSRT Radio Detection
  2. GRB100905A: 1.5m OSN upper limit
  3. GRB 100905A: Enhanced Swift-XRT position
  4. GRB 100905A: Swift detection of a burst
  5. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  6. GRB 100901A: Submm observations from SMA
  7. GRB 100902A: GROND observations; afterglow candidate
  8. GRB100902A: Optical upper limits at IAO
  9. GRB10901A: Optical observations at IAO
  10. IPN Triangulation of the very bright GRB 100829A
  11. GRB 100902A: Swift/UVOT Upper Limits
  12. GRB 100902A: optical observation at Mt.Terskol
  13. GRB 100901A: optical observation at Mt.Terskol
  14. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  15. GRB 100902A: Enhanced Swift-XRT position
  16. GRB 100901A: ISON-NM optical observations
  17. GRB 100902A: Swift detection of a burst
  18. GRB 100901A: Vega telescope optical afterglow observation
  19. Swift/UVOT Observations of GRB100901A
  20. GRB 100901A: SARA-N observations
  21. GRB100901A: MITSuME Okayama Optical Observation
  22. GRB 100901A - NOT optical observation
  23. GRB 100901A: Enhanced Swift-XRT position
  24. GRB 100901A: Swift detection of a burst with an optical afterglow
  25. Konus-Wind observation of GRB 100826A
  26. GRB 100829.9: MASTER Optical Limits
  27. GRB 100823A: optical upper limit
  28. GRB 100814A: Maidanak optical observations
  29. GRB 100823A: optical observations
  30. GRB 100823A: MAXI/GSC detection
  31. GRB 100725B: Mondy optical upper limit
  32. GRB 100725B: Maidanak optical upper limit
  33. GRB100807A: R band observations
  34. GRB 100823A: Swift XRT refined analysis
  35. GRB 100823A - second epoch WHT observations
  36. GRB 100823A: TNG NIR observations
  37. GRB 100823A: Swift/UVOT Upper Limits
  38. GRB 100823A: WHT observations
  39. GRB 100823A: Enhanced Swift-XRT position
  40. GRB 100823A: Swift detection of a burst
  41. EVLA radio afterglow detection of GRB 100814A
  42. GRB 100814A: optical observations
  43. GRB100816A: MITSuME optical upper limits
  44. GRB 100814A: NOT optical observations
  45. GRB 100816A: NOT optical observations
  46. GRB 100814A : Lulin optical observation
  47. GRB 100816A : Lulin r'-band observation
  48. GRB 100816A: Swift UVOT Observations
  49. GRB 100816A: Swift-BAT spectral lag results
  50. GRB 100816A: 1.23m CAHA optical observations
  51. GRB 100816A: Enhanced Swift-XRT position
  52. GRB 100816A: Gemini-N imaging
  53. GRB 100816A: TAROT Calern observatory optical detection
  54. GRB 100816A: MASTER Optical Limits
  55. GRB100816A: TNG optical afterglow confirmation.
  56. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  57. GRB 100814A: Submm observations from APEX
  58. Swift/UVOT observations of GRB100814A
  59. GRB 100814A, Swift-BAT refined analysis
  60. GRB 100814A: Enhanced Swift-XRT position
  61. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  62. GRB 100814A: Swift detection of a burst with an optical afterglow
  63. GRB 100805A: the 4-th epoch of SAO RAS optical observations
  64. GRB 100805A: optical observation in CrAO (correction to the GCN 11077 and second epoch)
  65. GRB 100802A: further NOT observation
  66. GRB 100807A: P200 Infrared Observations
  67. GRB 100805A: the 3-rd epoch of SAO RAS optical observations
  68. GRB100807A: optical observation in CrAO
  69. GRB 100805A: optical observation in CrAO
  70. GRB 100805A: 2-nd epoch of SAO RAS optical observations
  71. GRB100807A: MITSuME optical upper limits
  72. GRB 100807A: P60 Optical Afterglow Discovery
  73. GRB 100807A: Swift/UVOT Upper Limits
  74. GRB 100805A: SAO RAS optical observations
  75. GRB 100807A: Enhanced Swift-XRT position
  76. GRB 100807A: Swift detection of a burst
  77. GRB 100805A: IAC80 and 1.5m OSN optical observations
  78. GRB 100805A: Early RAPTOR Observations
  79. GRB 100805A: Swift/UVOT Observations of the Optical Afterglow
  80. GRB 100802A: WIYN observations
  81. GRB 100805A: IAC80 BVR-band observations
  82. GRB 100805A: GRAS 002 optical observations
  83. Trigger 430975: Swift detection of a possible burst
  84. GRB 100805A: I-band detection from 1.23m CAHA telescope.
  85. GRB 100805A: Enhanced Swift-XRT position
  86. GRB 100805A: Further P60 Monitoring
  87. GRB 100805A: P60 Optical Afterglow Candidate
  88. GRB 100805A: Swift detection of a burst with an optical counterpart
  89. GRB 100728B: optical photometry of ISON-NM
  90. GRB 100713A: second epoch Maidanak optical observation
  91. GRB 100713A: CrAO optical limits
  92. GRB 100802A: NOT optical observation
  93. GRB100802A: MITSuME optical upper limits
  94. GRB 100802A: P60 Observations
  95. GRB 100802A: Swift/UVOT Possible Optical Afterglow
  96. GRB 100802A: Enhanced Swift-XRT position
  97. GRB 100802A: Swift detection of a burst
  98. GRB 100728B - NOT optical observation
  99. GRB 100728B: Swift/UVOT Observations
  100. GRB 100728B: Continued KAIT observations

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