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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"

16154 results found.

  1. GRB 100901A: optical observations in Mondy and R-light curve
  2. GRB100909A: NOT optical afterglow confirmation
  3. GRB 100906A: optical observations at Mt.Terskol
  4. GRB 100901A: optical observation in Maidanak, break confirmation
  5. GRB 100909A: ROTSE-III Optical Limits
  6. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  7. GRB100901A: IAO optical upper limits at 4 days after the burst
  8. GRB 100901A: Confirmation of WSRT Radio Detection
  9. GRB 100901A: CrAO optical observations
  10. GRB 100906A: RTT150 optical observations
  11. GRB 100906A: GRAS-007 optical observations
  12. GRB100906A: Optical observations at IAO
  13. GRB 100906A: TLS Monitoring
  14. GRB 100906A: Swift/UVOT Observations
  15. GRB100906A: MITSuME Okayama Optical Observation
  16. GRB 100906A: Ondrejov 65cm observations
  17. GRB 100906A: MASTER preliminary prompt+afterglow lc
  18. GRB 100901A: ISON-NM optical observations
  19. GRB 100906A: MASTER preliminary polarization prompt light curve
  20. GRB 100906A : Faulkes Telescope North optical observations
  21. GRB 100906A: Swift detection of a burst with an optical afterglow
  22. GRB 100829A: MASTER optical observations
  23. GRB100905A: Optical upper limits at IAO
  24. GRB100905A: MITSuME Okayama optical upper limits
  25. GRB 100901A: Possible WSRT Radio Detection
  26. GRB100904A: BOOTES-3 Upper Limit
  27. GRB 100905A: MASTER Prompt Optical Observations
  28. Optical observations of GRB 100901A
  29. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  30. GRB100902A: Optical upper limits at IAO
  31. GRB10901A: Optical observations at IAO
  32. GRB 100901A: optical observation at Mt.Terskol
  33. GRB 100901A: Lightbuckets Optical Observations
  34. GRB 100901A: HCT optical observations
  35. GRB 100902A: 1.5m OSN I-band Upper Limits
  36. Tentative redshift of GRB100902A from Swift-XRT data
  37. GRB 100902A: Swift/UVOT Upper Limits
  38. GRB 100902A: optical observation at Mt.Terskol
  39. GRB 100901A: optical observation at Mt.Terskol
  40. GRB 100901A: Kanata Telescope observation of the optical afterglow
  41. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  42. GRB 100901A: TLS Observations: Break?
  43. GRB 100902A: MASTER Prompt Optical Observations
  44. GRB 100901A: ISON-NM optical observations
  45. GRB 100902A: MASTER Optical Early Limit
  46. GRB 100901A: 1.5m OSN BVRI-band observations.
  47. GRB 100901A: ROTSE-III Detection
  48. GRB 100901A: MASTER optical flare at 420s discovery
  49. GRB 100901A: Vega telescope optical afterglow observation
  50. GRB 100901A : HCT optical observations
  51. GRB 100901A: SARA-N observations
  52. GRB 100901A: THO optical observations
  53. GRB100901A: MITSuME Okayama Optical Observation
  54. GRB 100901A - NOT optical observation
  55. GRB 100901A: optical observation at Mt.Terskol
  56. GRB 100901A: optical observation at Mt.Terskol
  57. GRB 100901A: MASTER power low decay
  58. GRB 100901A: Gemini-N Redshift
  59. GRB 100901A: MASTER Optical Early Limits
  60. GRB 100901A: Swift detection of a burst with an optical afterglow
  61. GRB 100829.9: MASTER Optical Limits
  62. GRB 100823A: optical upper limit
  63. GRB 100814A: Maidanak optical observations
  64. GRB 100823A: optical observations
  65. GRB 100725B: Mondy optical upper limit
  66. GRB 100725B: Maidanak optical upper limit
  67. GRB100823A : MOA optical observation
  68. GRB 100823A: Swift/UVOT Upper Limits
  69. GRB 100814A: ISON-NM optical observations
  70. GRB 100814A: optical observations
  71. GRB100816A: MITSuME optical upper limits
  72. GRB 100816A: 10.4-m GTC redshift confirmation
  73. GRB 100814A : Liverpool Telescope Observations
  74. GRB 100814A: NOT optical observations
  75. GRB 100816A: NOT optical observations
  76. GRB 100814A : Lulin optical observation
  77. GRB 100816A: Swift UVOT Observations
  78. GRB 100816A: 1.23m CAHA optical observations
  79. GRB100814A - interesting UVOT lightcurve.
  80. GRB 100816A: TAROT Calern observatory optical detection
  81. GRB 100816A: MASTER Optical Limits
  82. GRB100816A: TNG optical afterglow confirmation.
  83. GRB 100816A: ROTSE-III Optical Limits
  84. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  85. Swift/UVOT observations of GRB100814A
  86. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  87. GRB 100814A: IAC80 R-band observations
  88. GRB 100814A: Swift UVOT observations of the optical afterglow
  89. GRB 100814A: Swift detection of a burst with an optical afterglow
  90. GRB 100814A: ROTSE-III Detection of Optical Counterpart
  91. GRB 100805A: the 4-th epoch of SAO RAS optical observations
  92. GRB 100805A: optical observation in CrAO (correction to the GCN 11077 and second epoch)
  93. GRB 100805A: Swift/UVOT Observations of a Possible Late-Time Brightening
  94. GRB 100807A: P200 Infrared Observations
  95. GRB 100805A: the 3-rd epoch of SAO RAS optical observations
  96. GRB100807A: optical observation in CrAO
  97. GRB 100805A: optical observation in CrAO
  98. GRB 100805A: 2-nd epoch of SAO RAS optical observations
  99. GRB100807A: MITSuME optical upper limits
  100. GRB 100807A: P60 Optical Afterglow Discovery

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