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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"

16161 results found.

  1. GRB 0800707: optical observations
  2. GRB 080710: Gemini spectroscopy and probable redshift
  3. GRB 080710: REM afterglow confirmation & brightening
  4. GRB 080710: KAIT OA candidate
  5. GRB 080707: possible break in the X-rays
  6. GRB 080707: GROND Confirmation of the Optical Afterglow
  7. GRB 080707: Swift XRT refined analysis
  8. GRB 080707: VLT redshift
  9. GRB 080707: GROND Detection of the Optical Afterglow Candidate
  10. Trigger 316063: Swift detection of a transient
  11. GRB 080702B: GROND Upper Limits
  12. GRB 080703: UVOT Follow-Up Observation
  13. GRB 080703: VLT observations of the afterglow
  14. GRB 080703: Swift detection of a burst with optical afterglow
  15. GRB 080703A: ROTSE-III Detection of Optical Counterpart
  16. GRB 080702b: LCO optical observations
  17. GRB 080702B: Swift XRT and UVOT observations
  18. GRB 080702A: MITSuME Akeno optical upper limits
  19. GRB 080701A: Early RAPTOR optical limits
  20. Swift Trigger 315630: Swift/UVOT Upper Limits
  21. GRB 080701A, VATT optical upper limit
  22. GRB 080701: Swift detection of a burst
  23. GRB 080625: Swift/UVOT Follow-Up Observations
  24. GRB 080625: Swift/UVOT Detection of an Optical Afterglow
  25. GRB 080623: GROND upper limits
  26. GRB080623: Swift UVOT followup observations
  27. GRB 080623: TAROT La Silla observatory optical observations
  28. GRB 080623: Swift/UVOT Non-Detection of an Optical Afterglow
  29. GRB080607: optical observation
  30. GRB 080603b: optical observation
  31. GRB 070809: Putative host galaxy and redshift
  32. GRB 0800603A: optical observation
  33. GRB080613B: MITSuME upper limits
  34. GRB080613A: Optical upper limits with Okayama MITSuME telescope
  35. GRB 080603A: optical observations on June 04
  36. GRB 080613A: Swift-XRT detection of the afterglow
  37. GRB080613A: Swift/UVOT Upper Limits
  38. GRB 080613B - NOT optical and IR nondetections
  39. GRB080613B: Swift/UVOT Upper Limits
  40. GRB 080613: Faulkes Telescope North optical candidate
  41. GRB 080603A: Late-time Keck imaging and spectroscopy
  42. GRB 080603b: optical observation
  43. GRB 080603A: final Swift-XRT observations.
  44. GRB080605: optical observation with the MITSuME-OAO telescope
  45. GRB080607: RTT150 optical observations
  46. GRB 080603A: optical observations
  47. Swift/UVOT Observations of GRB080607
  48. GRB 080605: optical observations
  49. GRB 080607 KAIT observations
  50. VLA detection of INTEGRAL burst GRB 080603A
  51. GRB 080605: GROND 2nd epoch observations
  52. GRB 080607 - PAIRITEL NIR detection
  53. GRB 080607: Keck/LRIS spectroscopy and redshift
  54. GRB 080607: Swift detection of a burst with optical afterglow
  55. GRB 080607: ROTSE-III Detection of Optical Counterpart
  56. GRB 080605: Swift-UVOT refined analysis
  57. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  58. GRB080605: observation by BOOTES
  59. GRB 080605: GROND detection of the optical afterglow candidate
  60. GRB080605: optical observations
  61. GRB 080605: VLT redshift
  62. GRB 080605: Liverpool Telescope optical afterglow candidate
  63. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  64. GRB 080605: Swift detection of a burst with an optical afterglow
  65. GRB 080603B: PAIRITEL infrared detection
  66. GRB 080603A: PAIRITEL infrared detection
  67. Swift/UVOT observations of GRB080604
  68. GRB 080604: Gemini-North spectroscopy
  69. GRB 080603B: Hobby-Eberly Telescope redshift confirmation
  70. GRB 080603B : Liverpool Telescope Observations
  71. GRB 080430: optical observations
  72. GRB 080603B: Swift/UVOT detection of the afterglow
  73. GRB 080604: Hobby-Eberly Telescope spectroscopy
  74. GRB 080603A: Swift/UVOT detection of the afterglow
  75. GRB080603B: RTT150 optical observations, break in light curves
  76. GRB080604: confirmation of optical afterglow
  77. GRB 080604: Swift detection of a burst with an optical afterglow
  78. GRB 080603B: TAROT Calern observatory confirmation of slow optical decay
  79. GRB 080516: TAROT La Silla observatory optical observations
  80. GRB 080603B: BOOTES2/TELMA optical observations
  81. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  82. GRB 080603B: Swift detection of a burst with optical afterglow
  83. GRB080603: Super-LOTIS detection of Optical Counterpart
  84. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  85. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  86. GRB 080523: afterglow confirmation and redshift constraints
  87. GRB 080503: 2nd Epoch Chandra X-ray Observations
  88. GRB 080523: VLT optical observations
  89. Swift/UVOT observations of GRB 080523
  90. GRB 80516: Swift/UVOT Observations
  91. GRB 080514B: UVOT Observations
  92. GRB 080520: VLT redshift
  93. GRB 080520: Swift detection of a burst with optical afterglow
  94. GRB080517: Liverpool Telescope Optical Observations
  95. GRB 080517: Swift detection of a burst
  96. GRB080430: optical observations
  97. GRB 080516, SMARTS optical/IR observations
  98. GRB 080514B: slow fading behaviour ?
  99. GRB 080514B: Finding chart
  100. GRB080514: REM NIR & Optical Observations

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