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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"

16155 results found.

  1. GRB 100901A: errata of GRB name in GCN 11270
  2. GRB 100901A: optical observations in Mondy and R-light curve
  3. GRB100909A: NOT optical afterglow confirmation
  4. GRB 100906A: optical observations at Mt.Terskol
  5. GRB 100901A: optical observation in Maidanak, break confirmation
  6. GRB 100909A: ROTSE-III Optical Limits
  7. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  8. GRB100901A: IAO optical upper limits at 4 days after the burst
  9. GRB 100901A: Confirmation of WSRT Radio Detection
  10. GRB 100901A: CrAO optical observations
  11. GRB 100906A: RTT150 optical observations
  12. GRB 100906A: GRAS-007 optical observations
  13. GRB100906A: Optical observations at IAO
  14. GRB 100906A: TLS Monitoring
  15. GRB 100906A: Swift/UVOT Observations
  16. GRB100906A: MITSuME Okayama Optical Observation
  17. GRB 100906A: Ondrejov 65cm observations
  18. GRB 100906A: MASTER preliminary prompt+afterglow lc
  19. GRB 100901A: ISON-NM optical observations
  20. GRB 100906A: MASTER preliminary polarization prompt light curve
  21. GRB 100906A : Faulkes Telescope North optical observations
  22. GRB 100906A: Swift detection of a burst with an optical afterglow
  23. GRB 100829A: MASTER optical observations
  24. GRB100905A: Optical upper limits at IAO
  25. GRB100905A: MITSuME Okayama optical upper limits
  26. GRB 100901A: Possible WSRT Radio Detection
  27. GRB100904A: BOOTES-3 Upper Limit
  28. GRB 100905A: MASTER Prompt Optical Observations
  29. Optical observations of GRB 100901A
  30. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  31. GRB100902A: Optical upper limits at IAO
  32. GRB10901A: Optical observations at IAO
  33. GRB 100901A: optical observation at Mt.Terskol
  34. GRB 100901A: Lightbuckets Optical Observations
  35. GRB 100901A: HCT optical observations
  36. GRB 100902A: 1.5m OSN I-band Upper Limits
  37. Tentative redshift of GRB100902A from Swift-XRT data
  38. GRB 100902A: Swift/UVOT Upper Limits
  39. GRB 100902A: optical observation at Mt.Terskol
  40. GRB 100901A: optical observation at Mt.Terskol
  41. GRB 100901A: Kanata Telescope observation of the optical afterglow
  42. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  43. GRB 100901A: TLS Observations: Break?
  44. GRB 100902A: MASTER Prompt Optical Observations
  45. GRB 100901A: ISON-NM optical observations
  46. GRB 100902A: MASTER Optical Early Limit
  47. GRB 100901A: 1.5m OSN BVRI-band observations.
  48. GRB 100901A: ROTSE-III Detection
  49. GRB 100901A: MASTER optical flare at 420s discovery
  50. GRB 100901A: Vega telescope optical afterglow observation
  51. GRB 100901A : HCT optical observations
  52. GRB 100901A: SARA-N observations
  53. GRB 100901A: THO optical observations
  54. GRB100901A: MITSuME Okayama Optical Observation
  55. GRB 100901A - NOT optical observation
  56. GRB 100901A: optical observation at Mt.Terskol
  57. GRB 100901A: optical observation at Mt.Terskol
  58. GRB 100901A: MASTER power low decay
  59. GRB 100901A: Gemini-N Redshift
  60. GRB 100901A: MASTER Optical Early Limits
  61. GRB 100901A: Swift detection of a burst with an optical afterglow
  62. GRB 100829.9: MASTER Optical Limits
  63. GRB 100823A: optical upper limit
  64. GRB 100814A: Maidanak optical observations
  65. GRB 100823A: optical observations
  66. GRB 100725B: Mondy optical upper limit
  67. GRB 100725B: Maidanak optical upper limit
  68. GRB100823A : MOA optical observation
  69. GRB 100823A: Swift/UVOT Upper Limits
  70. GRB 100814A: ISON-NM optical observations
  71. GRB 100814A: optical observations
  72. GRB100816A: MITSuME optical upper limits
  73. GRB 100816A: 10.4-m GTC redshift confirmation
  74. GRB 100814A : Liverpool Telescope Observations
  75. GRB 100814A: NOT optical observations
  76. GRB 100816A: NOT optical observations
  77. GRB 100814A : Lulin optical observation
  78. GRB 100816A: Swift UVOT Observations
  79. GRB 100816A: 1.23m CAHA optical observations
  80. GRB100814A - interesting UVOT lightcurve.
  81. GRB 100816A: TAROT Calern observatory optical detection
  82. GRB 100816A: MASTER Optical Limits
  83. GRB100816A: TNG optical afterglow confirmation.
  84. GRB 100816A: ROTSE-III Optical Limits
  85. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  86. Swift/UVOT observations of GRB100814A
  87. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  88. GRB 100814A: IAC80 R-band observations
  89. GRB 100814A: Swift UVOT observations of the optical afterglow
  90. GRB 100814A: Swift detection of a burst with an optical afterglow
  91. GRB 100814A: ROTSE-III Detection of Optical Counterpart
  92. GRB 100805A: the 4-th epoch of SAO RAS optical observations
  93. GRB 100805A: optical observation in CrAO (correction to the GCN 11077 and second epoch)
  94. GRB 100805A: Swift/UVOT Observations of a Possible Late-Time Brightening
  95. GRB 100807A: P200 Infrared Observations
  96. GRB 100805A: the 3-rd epoch of SAO RAS optical observations
  97. GRB100807A: optical observation in CrAO
  98. GRB 100805A: optical observation in CrAO
  99. GRB 100805A: 2-nd epoch of SAO RAS optical observations
  100. GRB100807A: MITSuME optical upper limits

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