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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"

914 results found.

  1. GRB 120326A: MITSuME Ishigakijima Optical Observation
  2. GRB 120320A: MITSuME Okayama Optical upper limits
  3. GRB 111228A: possible detection of the SN with the TNG
  4. GRB 120311B: MITSuME Okayama Optical upper limits
  5. GRB120308A: MITSuME Ishigakijima Optical Upper Limits
  6. GRB 120215A: MITSuME Akeno Optical upper limits
  7. GRB 120219A: MITSuME Okayama Optical upper limits
  8. GRB 120215A: MITSuME Okayama Optical upper limits
  9. GRB 120212A: MITSuME Ishigakijima Optical Observation
  10. GRB 120211A: MITSuME Okayama and Ishigakijima Optical upper limits
  11. GRB 120106A: MITSuME Okayama Optical Observation (update)
  12. GRB 120106A: MITSuME Okayama Optical upper limits
  13. GRB 111211A: Detection of the SN with the 10.4m GTC
  14. GRB111228A: MITSuME Akeno photometry of the optical afterglow
  15. GRB111228A: Errata of MITSuME Okayama about GRB name in GCNC 12743
  16. GRB111228A: MITSuME Okayama Optical Observation
  17. GRB111225A: MITSuME Okayama optical upper limits
  18. GRB 111210A: optical upper limit of Mt. Terskol observatory
  19. GRB 111103A: optical upper limit of Mt. Terskol observatory
  20. GRB 111211A: optical ovservations at Mt. Terskol observatory
  21. GRB111215A: optical upper limit
  22. GRB 111215A: MITSuME Okayama Optical upper limits
  23. GRB 111215A: MITSuME Akeno Optical upper limits
  24. GRB 111210A: MITSuME Okayama Optical upper limits
  25. GRB 111123A: MITSuME Okayama Optical upper limits
  26. GRB 111103B: optical upper limit of Mt. Terskol observatory
  27. GRB 111103B: MITSuME Akeno Optical upper limits
  28. GRB 111029A: SAO RAS optical limits
  29. GRB111029A: MITSuME Ishigakijima Optical Upper Limits
  30. GRB 111022B: BTA Optical Observations
  31. GRB 111022A: MITSuME Akeno Optical upper limits
  32. GRB 111022B: MITSuME Akeno Optical upper limits
  33. GRB 111016A: MITSuME Akeno Optical upper limits
  34. GRB 110921A: MITSuME-Akeno Optical photometry
  35. Skynet observations of GRB 110928A
  36. GRB 110921A: MITSuME Akeno Optical Observation
  37. GRB 110915A: MITSuME Okayama and Ishigakijima Optical upper limits
  38. GRB 110915A: MITSuME Akeno Optical upper limits
  39. GRB110820A: MITSuME Ishigakijima Optical Upper Limits
  40. GRB110801A: MITSuME Ishigakijima Optical Observation at 1 day after the burst
  41. GRB110801A: MITSuME Ishigakijima Optical Observation
  42. GRB110731A: MITSuME Ishigakijima Optical Upper Limits
  43. GRB110726A: MITSuME Ishigakijima Optical Observation
  44. GRB110709A: MITSuME Ishigakijima Optical upper limits
  45. GRB 110530A: optical observations at Mt. Terskol, second epoch
  46. GRB110530A: MITSuME Okayama Optical Observation
  47. GRB 110530A: optical observations at Mt. Terskol
  48. GRB 110530A: MITSuME Akeno Optical Observation
  49. GRB 110503A - TLS Afterglow Observations
  50. GRB110422A: MITSuME Ishigakijima Optical Observation
  51. GRB110414A: MITSuME Ishigakijima Optical upper limits
  52. GRB110414A: MITSuME Okayama Optical upper limits
  53. GRB 110407A: MITSuME Okayama and Ishigakijima Optical upper limits
  54. GRB 110402A: MITSuME Okayama and Ishigakijima Optical upper limits
  55. GRB / X-ray transient 110328A: MITSuME OkayamaOptical upper limits
  56. GRB110312A: MITSuME Okayama Optical upper limits
  57. GRB110305A: MITSuME Ishigakijima Optical upper limits
  58. GRB 110213A: MITSuME Akeno Optical Observation
  59. GRB110213A: MITSuME Okayama Optical Observation
  60. GRB110212A: MITSuME Okayama optical upper limits
  61. GRB110205A: MITSuME Ishigakijima Optical Observation
  62. GRB110205A: MITSuME Okayama Optical Observation
  63. GRB110201A: MITSuME Okayama optical upper limits
  64. GRB110128A: MITSuME Okayama optical upper limits
  65. GRB110119A: MITSuME Okayama optical upper limits
  66. GRB 110112A: MITSuME Akeno and Okayama optical upper limits
  67. GRB 110106A: MITSuME Okayama optical upper limits
  68. GRB110102A: MITSuME Okayama Optical Observation
  69. GRB101224A: MITSuME Okayama optical upper limits
  70. GRB 101219A: MITSuME Ishigakijima Optical upper limits
  71. GRB101017A: MITSuME Okayama optical upper limits
  72. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  73. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  74. GRB100915A: MITSuME Ishigakijima Optical upper limits
  75. GRB100909A: MITSuME Ishigakijima Optical upper limits
  76. GRB 100906A: optical observations at Mt.Terskol
  77. GRB100901A: IAO optical upper limits at 4 days after the burst
  78. GRB100906A: Optical observations at IAO
  79. GRB 100906A: TLS Monitoring
  80. GRB100906A: Errata of MITSuME Okayama about observation time
  81. GRB100906A: MITSuME Okayama Optical Observation
  82. GRB 100906A: TLS Multicolor Observations
  83. GRB100905A: Optical upper limits at IAO
  84. GRB100905A: MITSuME Okayama optical upper limits
  85. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  86. GRB100902A: Optical upper limits at IAO
  87. GRB10901A: Optical observations at IAO
  88. GRB 100901A: multicolor photometry at Mt.Terskol
  89. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  90. GRB100901A: MITSuME Okayama Optical Observation
  91. GRB100816A: MITSuME optical upper limits
  92. GRB100807A: MITSuME optical upper limits
  93. GRB100802A: MITSuME optical upper limits
  94. GRB100725B: MITSuME optical upper limits
  95. GRB 100418A: Subaru late-time optical imaging and spectroscopy
  96. GRB 100513A: MITSuME Akeno Optical Observation
  97. GRB100504A: Optical upper limits at IAO
  98. GRB100424A: MITSuME optical upper limits
  99. GRB100423A: MITSuME optical upper limits
  100. GRB100420A: MITSuME optical upper limits

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