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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"

27549 results found.

  1. GRB 080330: TAROT Calern observatory optical detection
  2. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  3. GRB 080328: BTA optical imaging and spectroscopy
  4. GRB 080328: Swift XRT refined analysis
  5. Swift/UVOT observations of GRB080328
  6. GRB080325 - I and z-band Imaging
  7. GRB 080328: Enhanced Swift-XRT position
  8. GRB080328: Faulkes Telescope North observations
  9. GRB 080328: Swift detection of a burst with an optical counterpart
  10. GRB 080325: Subaru detection of NIR afterglow candidate
  11. GRB080310, late-time photometry with LBT
  12. GRB 080325: MITSuME Akeno optical upper limits
  13. GRB080325: XRT Refined Analysis
  14. GRB 080325: GROND Observations
  15. GRB080319B: optical observations
  16. GRB 080325: Swift/UVOT Upper Limits
  17. GRB 080319C: Gemini-North spectroscopic redshift
  18. GRB 080325: Early observations from OSN
  19. GRB 080325: NIR afterglow candidate
  20. GRB 080319D: GROND Detection of the Optical Counterpart
  21. GRB 080325: Enhanced Swift-XRT position
  22. GRB 080325: Swift detection of a burst
  23. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  24. GRB 080319B: Spitzer Mid-infrared Observations
  25. GRB 080319B: Second & Third Epoch WSRT Radio Observations
  26. Radio Detection of GRB 080319B
  27. GRB 080319B: Optical observation (Brno, CZ)
  28. GRB 080319D: GROND Observations
  29. GRB 080319B: optical upper limit
  30. GRB 080319D: optical upper limit
  31. GRB080319B: Time-Independent XRT Spectrum
  32. GRB 080319C: UVOT Observations
  33. GRB 080319B: UVOT Observations
  34. GRB 080319A: UVOT Observations
  35. GRB 080320: Swift XRT refined analysis
  36. GRB 080319B - CARMA mm Observations
  37. GRB 080320: Early Super-LOTIS Observations
  38. GRB 080320: J detection with FLAMINGOS
  39. GRB 080319D: Swift XRT refined analysis
  40. GRB 080320: optical limit
  41. GRB 080320: Gemini-N optical afterglow
  42. GRB 080319B: Gemini-South photometry
  43. GRB 080319B: Allen Telescope Array Observations
  44. GRB 080319B optical observations
  45. GRB 080319B: WSRT Radio Observations
  46. GRB 080320: SDSS source and Gemini-N observations
  47. GRB 080320: Enhanced Swift-XRT position
  48. GRB 080320: optical limit from IAC80
  49. GRB 080319C: KAIT OA observations
  50. GRB 080320: Swift detection of a burst
  51. GRB 080320: ROTSE-III Optical Limits
  52. GRB 080319B : Lulin observation of temporal break at 0.2 days
  53. GRB 080319B: RAPTOR observations of a naked eye burst
  54. GRB 080319A: Swift-XRT Team Refined Analysis
  55. GRB080319B: Prompt PROMPT Detections
  56. GRB 080319C: Swift-XRT Team Refined Analysis
  57. GRB 080319B: Swift-XRT Team Refined Analysis
  58. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  59. GRB 080319C: AGILE-MCAL observation of the prompt emission
  60. GRB 080319B: Hobby-Eberly Telescope Spectroscopy
  61. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  62. GRB 080319B: TORTORA synchronous observation
  63. VLT/UVES redshift of GRB 080319B from FeII fine-structure lines
  64. GRB 080319B: Enhanced Swift-XRT position
  65. GRB 080319A: Enhanced Swift-XRT position
  66. VLT/UVES redshift of GRB 080319B
  67. GRB 080319C: Early Super-LOTIS Observations
  68. GRB 080319C: Swift detection of a burst with an optical afterglow
  69. GRB 080319C: KAIT OA candidate
  70. GRB 080319A: REM observations
  71. GRB 080319b prompt optical observation by Pi-of-the-Sky
  72. GRB 080319B: Gemini-South Spectroscopy
  73. GRB 080319A: optical observations at the NOT
  74. GRB0 080319B : LOAO optical observation
  75. GRB080319B Liverpool Telescope optical afterglow candidate
  76. GRB 080319B: Super-LOTIS Detection of a Bright OT
  77. GRB 080319B: REM observations
  78. GRB 080319B: KAIT OA
  79. GRB080319A: P60 Optical Afterglow Observations
  80. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  81. GRB 080319A: Swift detection of a burst
  82. GRB080310, LBT and MDM photometry
  83. GRB080315: Bok Optical Observations
  84. Swift/UVOT observations of GRB 080315
  85. Swift trigger 306323: Swift-BAT/XRT refined analysis
  86. SAX J1818.6-1703: Swift detection (trigger 306379)
  87. GRB 080315: Swift detection of a possible burst
  88. GRB080310 : Lulin Optical observations
  89. GRB080310, unusual slow decay in the optical
  90. GRB080310 : Optical observations by LOAO and Lulin
  91. GRB 080310: ROTSE-III Observations of Optical Counterpart
  92. GRB080310: Optical observation by MITSuME telescope
  93. GRB080310, optical observations with the LBT
  94. GRB 080229A: GAO 150cm telescope Optical Observation
  95. GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
  96. GRB 080307: NIR upper limit
  97. GRB 080229: NIR upper limit
  98. GRB 080310, Swift-BAT refined analysis
  99. GRB080210: optical observations
  100. GRB080307: optical upper limit

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