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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"

28058 results found.

  1. GRB080330: LOAO R-band Detection
  2. GRB 080330: GROND Observations
  3. GRB 080330: NOT redshift
  4. GRB 080330: TAROT Calern observatory optical observations
  5. GRB 080330A: PAIRITEL Infrared Detections
  6. GRB 080330: error in reported XRT position
  7. GRB 080330: Liverpool Telescope Optical observations
  8. GRB 080330A: ROTSE-III Detection of Optical Counterpart
  9. GRB 080330: Swift detection of a burst with an optical counterpart
  10. GRB 080330: TAROT Calern observatory optical detection
  11. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  12. GRB 080328: BTA optical imaging and spectroscopy
  13. GRB 080328: Swift XRT refined analysis
  14. Swift/UVOT observations of GRB080328
  15. GRB080325 - I and z-band Imaging
  16. GRB 080328: Enhanced Swift-XRT position
  17. GRB080328: Faulkes Telescope North observations
  18. GRB 080328: Swift detection of a burst with an optical counterpart
  19. GRB 080325: Subaru detection of NIR afterglow candidate
  20. GRB080310, late-time photometry with LBT
  21. GRB 080325: MITSuME Akeno optical upper limits
  22. GRB080325: XRT Refined Analysis
  23. GRB 080325: GROND Observations
  24. GRB080319B: optical observations
  25. GRB 080325: Swift/UVOT Upper Limits
  26. GRB 080319C: Gemini-North spectroscopic redshift
  27. GRB 080325: Early observations from OSN
  28. GRB 080325: NIR afterglow candidate
  29. GRB 080319D: GROND Detection of the Optical Counterpart
  30. GRB 080325: Enhanced Swift-XRT position
  31. GRB 080325: Swift detection of a burst
  32. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  33. GRB 080319B: Spitzer Mid-infrared Observations
  34. GRB 080319B: Second & Third Epoch WSRT Radio Observations
  35. Radio Detection of GRB 080319B
  36. GRB 080319B: Optical observation (Brno, CZ)
  37. GRB 080319D: GROND Observations
  38. GRB 080319B: optical upper limit
  39. GRB 080319D: optical upper limit
  40. GRB080319B: Time-Independent XRT Spectrum
  41. GRB 080319C: UVOT Observations
  42. GRB 080319B: UVOT Observations
  43. GRB 080319A: UVOT Observations
  44. GRB 080320: Swift XRT refined analysis
  45. GRB 080319B - CARMA mm Observations
  46. GRB 080320: Early Super-LOTIS Observations
  47. GRB 080320: J detection with FLAMINGOS
  48. GRB 080319D: Swift XRT refined analysis
  49. GRB 080320: optical limit
  50. GRB 080320: Gemini-N optical afterglow
  51. GRB 080319B: Gemini-South photometry
  52. GRB 080319B: Allen Telescope Array Observations
  53. GRB 080319B optical observations
  54. GRB 080319B: WSRT Radio Observations
  55. GRB 080320: SDSS source and Gemini-N observations
  56. GRB 080320: Enhanced Swift-XRT position
  57. GRB 080320: optical limit from IAC80
  58. GRB 080319C: KAIT OA observations
  59. GRB 080320: Swift detection of a burst
  60. GRB 080320: ROTSE-III Optical Limits
  61. GRB 080319B : Lulin observation of temporal break at 0.2 days
  62. GRB 080319B: RAPTOR observations of a naked eye burst
  63. GRB 080319A: Swift-XRT Team Refined Analysis
  64. GRB080319B: Prompt PROMPT Detections
  65. GRB 080319C: Swift-XRT Team Refined Analysis
  66. GRB 080319B: Swift-XRT Team Refined Analysis
  67. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  68. GRB 080319C: AGILE-MCAL observation of the prompt emission
  69. GRB 080319B: Hobby-Eberly Telescope Spectroscopy
  70. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  71. GRB 080319B: TORTORA synchronous observation
  72. VLT/UVES redshift of GRB 080319B from FeII fine-structure lines
  73. GRB 080319B: Enhanced Swift-XRT position
  74. GRB 080319A: Enhanced Swift-XRT position
  75. VLT/UVES redshift of GRB 080319B
  76. GRB 080319C: Early Super-LOTIS Observations
  77. GRB 080319C: Swift detection of a burst with an optical afterglow
  78. GRB 080319C: KAIT OA candidate
  79. GRB 080319A: REM observations
  80. GRB 080319b prompt optical observation by Pi-of-the-Sky
  81. GRB 080319B: Gemini-South Spectroscopy
  82. GRB 080319A: optical observations at the NOT
  83. GRB0 080319B : LOAO optical observation
  84. GRB080319B Liverpool Telescope optical afterglow candidate
  85. GRB 080319B: Super-LOTIS Detection of a Bright OT
  86. GRB 080319B: REM observations
  87. GRB 080319B: KAIT OA
  88. GRB080319A: P60 Optical Afterglow Observations
  89. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  90. GRB 080319A: Swift detection of a burst
  91. GRB080310, LBT and MDM photometry
  92. GRB080315: Bok Optical Observations
  93. Swift/UVOT observations of GRB 080315
  94. Swift trigger 306323: Swift-BAT/XRT refined analysis
  95. SAX J1818.6-1703: Swift detection (trigger 306379)
  96. GRB 080315: Swift detection of a possible burst
  97. GRB080310 : Lulin Optical observations
  98. GRB080310, unusual slow decay in the optical
  99. GRB080310 : Optical observations by LOAO and Lulin
  100. GRB 080310: ROTSE-III Observations of Optical Counterpart

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