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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"

908 results found.

  1. GRB 120219A: MITSuME Okayama Optical upper limits
  2. GRB 120215A: MITSuME Okayama Optical upper limits
  3. GRB 120212A: MITSuME Ishigakijima Optical Observation
  4. GRB 120211A: MITSuME Okayama and Ishigakijima Optical upper limits
  5. GRB 120106A: MITSuME Okayama Optical Observation (update)
  6. GRB 120106A: MITSuME Okayama Optical upper limits
  7. GRB 111211A: Detection of the SN with the 10.4m GTC
  8. GRB111228A: MITSuME Akeno photometry of the optical afterglow
  9. GRB111228A: Errata of MITSuME Okayama about GRB name in GCNC 12743
  10. GRB111228A: MITSuME Okayama Optical Observation
  11. GRB111225A: MITSuME Okayama optical upper limits
  12. GRB 111210A: optical upper limit of Mt. Terskol observatory
  13. GRB 111103A: optical upper limit of Mt. Terskol observatory
  14. GRB 111211A: optical ovservations at Mt. Terskol observatory
  15. GRB111215A: optical upper limit
  16. GRB 111215A: MITSuME Okayama Optical upper limits
  17. GRB 111215A: MITSuME Akeno Optical upper limits
  18. GRB 111210A: MITSuME Okayama Optical upper limits
  19. GRB 111123A: MITSuME Okayama Optical upper limits
  20. GRB 111103B: optical upper limit of Mt. Terskol observatory
  21. GRB 111103B: MITSuME Akeno Optical upper limits
  22. GRB 111029A: SAO RAS optical limits
  23. GRB111029A: MITSuME Ishigakijima Optical Upper Limits
  24. GRB 111022B: BTA Optical Observations
  25. GRB 111022A: MITSuME Akeno Optical upper limits
  26. GRB 111022B: MITSuME Akeno Optical upper limits
  27. GRB 111016A: MITSuME Akeno Optical upper limits
  28. GRB 110921A: MITSuME-Akeno Optical photometry
  29. Skynet observations of GRB 110928A
  30. GRB 110921A: MITSuME Akeno Optical Observation
  31. GRB 110915A: MITSuME Okayama and Ishigakijima Optical upper limits
  32. GRB 110915A: MITSuME Akeno Optical upper limits
  33. GRB110820A: MITSuME Ishigakijima Optical Upper Limits
  34. GRB110801A: MITSuME Ishigakijima Optical Observation at 1 day after the burst
  35. GRB110801A: MITSuME Ishigakijima Optical Observation
  36. GRB110731A: MITSuME Ishigakijima Optical Upper Limits
  37. GRB110726A: MITSuME Ishigakijima Optical Observation
  38. GRB110709A: MITSuME Ishigakijima Optical upper limits
  39. GRB 110530A: optical observations at Mt. Terskol, second epoch
  40. GRB110530A: MITSuME Okayama Optical Observation
  41. GRB 110530A: optical observations at Mt. Terskol
  42. GRB 110530A: MITSuME Akeno Optical Observation
  43. GRB 110503A - TLS Afterglow Observations
  44. GRB110422A: MITSuME Ishigakijima Optical Observation
  45. GRB110414A: MITSuME Ishigakijima Optical upper limits
  46. GRB110414A: MITSuME Okayama Optical upper limits
  47. GRB 110407A: MITSuME Okayama and Ishigakijima Optical upper limits
  48. GRB 110402A: MITSuME Okayama and Ishigakijima Optical upper limits
  49. GRB / X-ray transient 110328A: MITSuME OkayamaOptical upper limits
  50. GRB110312A: MITSuME Okayama Optical upper limits
  51. GRB110305A: MITSuME Ishigakijima Optical upper limits
  52. GRB 110213A: MITSuME Akeno Optical Observation
  53. GRB110213A: MITSuME Okayama Optical Observation
  54. GRB110212A: MITSuME Okayama optical upper limits
  55. GRB110205A: MITSuME Ishigakijima Optical Observation
  56. GRB110205A: MITSuME Okayama Optical Observation
  57. GRB110201A: MITSuME Okayama optical upper limits
  58. GRB110128A: MITSuME Okayama optical upper limits
  59. GRB110119A: MITSuME Okayama optical upper limits
  60. GRB 110112A: MITSuME Akeno and Okayama optical upper limits
  61. GRB 110106A: MITSuME Okayama optical upper limits
  62. GRB110102A: MITSuME Okayama Optical Observation
  63. GRB101224A: MITSuME Okayama optical upper limits
  64. GRB 101219A: MITSuME Ishigakijima Optical upper limits
  65. GRB101017A: MITSuME Okayama optical upper limits
  66. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  67. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  68. GRB100915A: MITSuME Ishigakijima Optical upper limits
  69. GRB100909A: MITSuME Ishigakijima Optical upper limits
  70. GRB 100906A: optical observations at Mt.Terskol
  71. GRB100901A: IAO optical upper limits at 4 days after the burst
  72. GRB100906A: Optical observations at IAO
  73. GRB 100906A: TLS Monitoring
  74. GRB100906A: Errata of MITSuME Okayama about observation time
  75. GRB100906A: MITSuME Okayama Optical Observation
  76. GRB 100906A: TLS Multicolor Observations
  77. GRB100905A: Optical upper limits at IAO
  78. GRB100905A: MITSuME Okayama optical upper limits
  79. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  80. GRB100902A: Optical upper limits at IAO
  81. GRB10901A: Optical observations at IAO
  82. GRB 100901A: multicolor photometry at Mt.Terskol
  83. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  84. GRB100901A: MITSuME Okayama Optical Observation
  85. GRB100816A: MITSuME optical upper limits
  86. GRB100807A: MITSuME optical upper limits
  87. GRB100802A: MITSuME optical upper limits
  88. GRB100725B: MITSuME optical upper limits
  89. GRB 100418A: Subaru late-time optical imaging and spectroscopy
  90. GRB 100513A: MITSuME Akeno Optical Observation
  91. GRB100504A: Optical upper limits at IAO
  92. GRB100424A: MITSuME optical upper limits
  93. GRB100423A: MITSuME optical upper limits
  94. GRB100420A: MITSuME optical upper limits
  95. Emerging Supernova in the Afterglow of GRB 100316D
  96. GRB100305A: Optical upper limits at IAO
  97. GRB 100219A: GAO 150cm telescope Optical Observation
  98. GRB100219A Akeno and Okayama MITSuME Optical Observation
  99. GRB100206: MITSuME optical upper limits
  100. GRB 091208A: GAO 150cm telescope Optical Observation

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