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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"

28041 results found.

  1. GRB 070125: Keck/LRIS Spectroscopy -- Evidence for a very low redshift
  2. GRB 070125: Lick 3m Spectroscopy
  3. GRB070125: Swift-XRT Refined Analysis
  4. GRB 070125: SARA detection in R
  5. GRB 070125: P60 Optical Afterglow Candidate
  6. GRB 070126?: Swift detection of a possible burst
  7. GRB070125 redshift request
  8. IPN localization of GRB070124 (short duration, hard spectrum)
  9. GRB 070110: Ep,i - Eiso correlation
  10. GRB 070107: Suzaku WAM observation of the prompt emission
  11. GRB070110: Swift XRT Team refined analysis
  12. GRB 070110, Swift-BAT refined analysis
  13. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  14. GRB 070110: Swift detection of a burst with a possible optical afterglow
  15. GRB 070107: Possible UVOT Afterglow
  16. GRB 070107, Swift-BAT refined analysis
  17. GRB 070107: Swift detection of a burst
  18. VLA observation of GRB 061222B
  19. VLA detection of GRB 061222A
  20. GRB070103: APO SPIcam i' and z' limits
  21. GRB070103: KPNO 4m+FLAMINGOS J limit
  22. GRB 070103: Swift/UVOT Upper limits
  23. GRB070103: Swift XRT refined analysis
  24. GRB 070103, Swift-BAT refined analysis
  25. GRB 070103: NOT observations
  26. GRB 070103: TAROT Calern observatory optical observations
  27. Retractions of previous Swift-BAT triggers
  28. erratum : SDSS Pre-burst Observations of GRB061126
  29. GRB 061210: Swift/XRT Astrometry Correction
  30. GRB 050826: MDM Redshift
  31. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  32. GRB 061222A: Xinglong Optical Limit
  33. GRB 061222A: Gemini Afterglow Candidate
  34. GRB 061222B, Swift-BAT refined analysis
  35. GRB061222A Swift/UVOT: Upper Limits
  36. GRB 061222B: Swift/UVOT Upper limits
  37. GRB 061222B: Observation with the KANATA 1.5m telescope
  38. GRB 061222A: Observation with the KANATA 1.5m telescope
  39. GRB 061222B: BOOTES-IR optical observations
  40. GRB 061222B: SARA upper limit
  41. GRB 061217: Magellan host galaxy redshift
  42. GRB 061222A, Swift-BAT refined analysis
  43. GRB 061222B: REM NIR/optical observations
  44. GRB 061222B: TAROT La Silla observatory optical observations
  45. GRB 061222B: Swift detection of a burst
  46. GRB 061222b: optical afterglow
  47. GRB 061222A: Prompt ROTSE-III Optical Limits
  48. GRB 061222: Swift detection of a burst
  49. GRB 061218: TAROT La Silla observatory optical observations
  50. GRB 061217: TAROT Calern observatory optical observations
  51. GRB 061218: TORTOREM optical upper limits
  52. GRB 061218, Swift-BAT refined analysis
  53. GRB061217: VLT NIR observations
  54. GRB 061218, SMARTS optical/IR observations
  55. GRB 061218: REM prompt observations
  56. Swift triggers (#251863) on a possible burst
  57. GRB061217: Swift/UVOT refined analysis.
  58. GRB 061217: optical observations at Calar Alto
  59. GRB061217 - Swift/XRT refined analysis
  60. GRB 061217, Swift-BAT refined analysis
  61. GRB 061217: Magellan Observations
  62. GRB 061217: REM prompt observations
  63. GRB 061217: ROTSE-III Optical Limits
  64. GRB061210: Swift/UVOT observations
  65. GRB 061210: Swift XRT analysis - Possible counterparts
  66. GRB 061210: Gemini/GMOS Observations
  67. GRB 061126: Radio Observations
  68. GRB061210: Radio Observations
  69. GRB 061202: Suzaku WAM observation of the prompt emission
  70. GRB 061210, Swift-BAT refined analysis of the SHB
  71. Optical Afterglow observations of GRB 061126
  72. GRB 060926: MASTER: discovery of the optical flare
  73. GRB 061201: UVOT Observations of a Fading Optical Afterglow
  74. GRB 061202: TORTOREM optical upper limits
  75. GRB 061201: VLT optical decay
  76. GRB 061201: SOAR Confirmation of Candidate Afterglow
  77. GRB061202: FRAM early follow-up limit
  78. GRB061202 optical limit by "Pi of the Sky"
  79. GRB061202: optical/NIR observations with REM
  80. GRB061202: Swift/UVOT Upper Limits
  81. GRB 061202, Swift-BAT refined analysis
  82. GRB 061202: Swift detection of a burst
  83. GRB 061201: VLT optical observations
  84. GRB 061201: Initial UVOT Observations
  85. GRB 061201, Swift-BAT refined analysis of the SHB
  86. GRB 061201: Swift detection of a short hard burst
  87. INT+WFC observations of GRB 061126
  88. Swift XRT on-board boresight update
  89. GRB 061126: optical observation
  90. GRB 061126: Tautenburg afterglow observations
  91. GRB061126: Optical afterglow observations from MIRO
  92. GRB061126: Optical afterglow observations from MIRO
  93. GRB 061126 : SDSS Pre-Burst Observations
  94. GRB 061126: Swift-XRT refined analysis
  95. GRB 061126: Swift/UVOT Observations
  96. GRB 061126, Swift-BAT refined analysis
  97. GRB 061126: Early Detection of the IR Afterglow
  98. GRB 061126: Swift/UVOT Afterglow Detection
  99. GRB 061122: Candidate Optical Afterglow
  100. GRB 061121: Ep,i - Eiso correlation

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