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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"

15993 results found.

  1. GRB 080710: Gemini spectroscopy and probable redshift
  2. GRB 080710: REM afterglow confirmation & brightening
  3. GRB 080710: KAIT OA candidate
  4. GRB 080707: possible break in the X-rays
  5. GRB 080707: GROND Confirmation of the Optical Afterglow
  6. GRB 080707: Swift XRT refined analysis
  7. GRB 080707: VLT redshift
  8. GRB 080707: GROND Detection of the Optical Afterglow Candidate
  9. Trigger 316063: Swift detection of a transient
  10. GRB 080702B: GROND Upper Limits
  11. GRB 080703: UVOT Follow-Up Observation
  12. GRB 080703: VLT observations of the afterglow
  13. GRB 080703: Swift detection of a burst with optical afterglow
  14. GRB 080703A: ROTSE-III Detection of Optical Counterpart
  15. GRB 080702b: LCO optical observations
  16. GRB 080702B: Swift XRT and UVOT observations
  17. GRB 080702A: MITSuME Akeno optical upper limits
  18. GRB 080701A: Early RAPTOR optical limits
  19. Swift Trigger 315630: Swift/UVOT Upper Limits
  20. GRB 080701A, VATT optical upper limit
  21. GRB 080701: Swift detection of a burst
  22. GRB 080625: Swift/UVOT Follow-Up Observations
  23. GRB 080625: Swift/UVOT Detection of an Optical Afterglow
  24. GRB080623: Swift UVOT followup observations
  25. GRB 080623: TAROT La Silla observatory optical observations
  26. GRB 080623: Swift/UVOT Non-Detection of an Optical Afterglow
  27. GRB080607: optical observation
  28. GRB 080603b: optical observation
  29. GRB 070809: Putative host galaxy and redshift
  30. GRB 0800603A: optical observation
  31. GRB080613B: MITSuME upper limits
  32. GRB080613A: Optical upper limits with Okayama MITSuME telescope
  33. GRB 080603A: optical observations on June 04
  34. GRB 080613A: Swift-XRT detection of the afterglow
  35. GRB080613A: Swift/UVOT Upper Limits
  36. GRB 080613B - NOT optical and IR nondetections
  37. GRB080613B: Swift/UVOT Upper Limits
  38. GRB 080613: Faulkes Telescope North optical candidate
  39. GRB 080603A: Late-time Keck imaging and spectroscopy
  40. GRB 080603b: optical observation
  41. GRB080605: optical observation with the MITSuME-OAO telescope
  42. GRB080607: RTT150 optical observations
  43. GRB 080603A: optical observations
  44. Swift/UVOT Observations of GRB080607
  45. GRB 080605: optical observations
  46. GRB 080607 KAIT observations
  47. VLA detection of INTEGRAL burst GRB 080603A
  48. GRB 080605: GROND 2nd epoch observations
  49. GRB 080607 - PAIRITEL NIR detection
  50. GRB 080607: Keck/LRIS spectroscopy and redshift
  51. GRB 080607: Swift detection of a burst with optical afterglow
  52. GRB 080607: ROTSE-III Detection of Optical Counterpart
  53. GRB 080605: Swift-UVOT refined analysis
  54. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  55. GRB080605: observation by BOOTES
  56. GRB 080605: GROND detection of the optical afterglow candidate
  57. GRB080605: optical observations
  58. GRB 080605: VLT redshift
  59. GRB 080605: Liverpool Telescope optical afterglow candidate
  60. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  61. GRB 080605: Swift detection of a burst with an optical afterglow
  62. GRB 080603B: PAIRITEL infrared detection
  63. GRB 080603A: PAIRITEL infrared detection
  64. Swift/UVOT observations of GRB080604
  65. GRB 080604: Gemini-North spectroscopy
  66. GRB 080603B: Hobby-Eberly Telescope redshift confirmation
  67. GRB 080603B : Liverpool Telescope Observations
  68. GRB 080430: optical observations
  69. GRB 080603B: Swift/UVOT detection of the afterglow
  70. GRB 080604: Hobby-Eberly Telescope spectroscopy
  71. GRB 080603A: Swift/UVOT detection of the afterglow
  72. GRB080603B: RTT150 optical observations, break in light curves
  73. GRB080604: confirmation of optical afterglow
  74. GRB 080604: Swift detection of a burst with an optical afterglow
  75. GRB 080603B: TAROT Calern observatory confirmation of slow optical decay
  76. GRB 080516: TAROT La Silla observatory optical observations
  77. GRB 080603B: BOOTES2/TELMA optical observations
  78. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  79. GRB 080603B: Swift detection of a burst with optical afterglow
  80. GRB080603: Super-LOTIS detection of Optical Counterpart
  81. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  82. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  83. GRB 080523: afterglow confirmation and redshift constraints
  84. GRB 080503: 2nd Epoch Chandra X-ray Observations
  85. GRB 080523: VLT optical observations
  86. Swift/UVOT observations of GRB 080523
  87. GRB 80516: Swift/UVOT Observations
  88. GRB 080514B: UVOT Observations
  89. GRB 080520: VLT redshift
  90. GRB 080520: Swift detection of a burst with optical afterglow
  91. GRB080517: Liverpool Telescope Optical Observations
  92. GRB 080517: Swift detection of a burst
  93. GRB080430: optical observations
  94. GRB 080516, SMARTS optical/IR observations
  95. GRB 080514B: Finding chart
  96. GRB080514: REM NIR & Optical Observations
  97. GRB 080506: NAYUTA Optical Observation
  98. GRB 080507: Keck photometry
  99. GRB 080507: E Pur Si Muove!
  100. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening

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