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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"

15741 results found.

  1. GRB 080701A, VATT optical upper limit
  2. GRB 080701: Swift detection of a burst
  3. GRB 080625: Swift/UVOT Follow-Up Observations
  4. GRB 080625: Swift/UVOT Detection of an Optical Afterglow
  5. GRB 080623: GROND upper limits
  6. GRB080623: Swift UVOT followup observations
  7. GRB 080623: TAROT La Silla observatory optical observations
  8. GRB 080623: Swift/UVOT Non-Detection of an Optical Afterglow
  9. GRB080607: optical observation
  10. GRB 080603b: optical observation
  11. GRB 070809: Putative host galaxy and redshift
  12. GRB 0800603A: optical observation
  13. GRB080613B: MITSuME upper limits
  14. GRB080613A: Optical upper limits with Okayama MITSuME telescope
  15. GRB 080603A: optical observations on June 04
  16. GRB 080613A: Swift-XRT detection of the afterglow
  17. GRB080613A: Swift/UVOT Upper Limits
  18. GRB 080613B - NOT optical and IR nondetections
  19. GRB080613B: Swift/UVOT Upper Limits
  20. GRB 080613: Faulkes Telescope North optical candidate
  21. GRB 080603A: Late-time Keck imaging and spectroscopy
  22. GRB 080603b: optical observation
  23. GRB 080603A: final Swift-XRT observations.
  24. GRB080605: optical observation with the MITSuME-OAO telescope
  25. GRB080607: RTT150 optical observations
  26. GRB 080603A: optical observations
  27. Swift/UVOT Observations of GRB080607
  28. GRB 080605: optical observations
  29. GRB 080607 KAIT observations
  30. VLA detection of INTEGRAL burst GRB 080603A
  31. GRB 080605: GROND 2nd epoch observations
  32. GRB 080607 - PAIRITEL NIR detection
  33. GRB 080607: Keck/LRIS spectroscopy and redshift
  34. GRB 080607: Swift detection of a burst with optical afterglow
  35. GRB 080607: ROTSE-III Detection of Optical Counterpart
  36. GRB 080605: Swift-UVOT refined analysis
  37. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  38. GRB080605: observation by BOOTES
  39. GRB 080605: GROND detection of the optical afterglow candidate
  40. GRB080605: optical observations
  41. GRB 080605: VLT redshift
  42. GRB 080605: Liverpool Telescope optical afterglow candidate
  43. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  44. GRB 080605: Swift detection of a burst with an optical afterglow
  45. GRB 080603B: PAIRITEL infrared detection
  46. GRB 080603A: PAIRITEL infrared detection
  47. Swift/UVOT observations of GRB080604
  48. GRB 080604: Gemini-North spectroscopy
  49. GRB 080603B: Hobby-Eberly Telescope redshift confirmation
  50. GRB 080603B : Liverpool Telescope Observations
  51. GRB 080430: optical observations
  52. GRB 080603B: Swift/UVOT detection of the afterglow
  53. GRB 080604: Hobby-Eberly Telescope spectroscopy
  54. GRB 080603A: Swift/UVOT detection of the afterglow
  55. GRB080603B: RTT150 optical observations, break in light curves
  56. GRB080604: confirmation of optical afterglow
  57. GRB 080604: Swift detection of a burst with an optical afterglow
  58. GRB 080603B: TAROT Calern observatory confirmation of slow optical decay
  59. GRB 080516: TAROT La Silla observatory optical observations
  60. GRB 080603B: BOOTES2/TELMA optical observations
  61. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  62. GRB 080603B: Swift detection of a burst with optical afterglow
  63. GRB080603: Super-LOTIS detection of Optical Counterpart
  64. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  65. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  66. GRB 080523: afterglow confirmation and redshift constraints
  67. GRB 080503: 2nd Epoch Chandra X-ray Observations
  68. GRB 080523: VLT optical observations
  69. Swift/UVOT observations of GRB 080523
  70. GRB 80516: Swift/UVOT Observations
  71. GRB 080514B: UVOT Observations
  72. GRB 080520: VLT redshift
  73. GRB 080520: Swift detection of a burst with optical afterglow
  74. GRB080517: Liverpool Telescope Optical Observations
  75. GRB 080517: Swift detection of a burst
  76. GRB080430: optical observations
  77. GRB 080516, SMARTS optical/IR observations
  78. GRB 080514B: slow fading behaviour ?
  79. GRB 080514B: Finding chart
  80. GRB080514: REM NIR & Optical Observations
  81. GRB 080506: NAYUTA Optical Observation
  82. GRB 080507: Keck photometry
  83. GRB 080507: E Pur Si Muove!
  84. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  85. GRB 080503: Hubble Space Telescope Imaging
  86. GRB080507: Swift/UVOT followup observations
  87. GRB 080507: Optical Afterglow
  88. GRB 080506:Optical observations from HCT
  89. GRB 080503: Fading in continued Gemini imaging
  90. GRB080503, RIMOTS optical upper limit
  91. GRB 080506: optical observation from Ondrejov
  92. GRB 080506: Optical observation with KANATA/TRISPEC
  93. GRB 080506: Swift detection of a burst with optical afterglow
  94. GRB 080503: Slow-rise optical AG ?
  95. GRB 080503: No further optical rebrightening
  96. GRB 080503: Late-time Optical rebrightening (possible mini-SN) - correction
  97. GRB 080503: Late-time Optical rebrightening (possible mini-SN)
  98. GRB 080503: MITSuME Ishigakijima optical upper limits
  99. GRB080503: Swift/UVOT Upper Limits
  100. GRB 080503: MITSuME Akeno optical upper limits

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