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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"
  1. GRB 080319C: Early Super-LOTIS Observations
  2. GRB 080319C: Swift detection of a burst with an optical afterglow
  3. GRB 080319C: KAIT OA candidate
  4. GRB 080319A: REM observations
  5. GRB 080319b prompt optical observation by Pi-of-the-Sky
  6. GRB 080319B: Change in power law decay index
  7. GRB 080319B: Gemini-South Spectroscopy
  8. GRB 080319A: optical observations at the NOT
  9. GRB0 080319B : LOAO optical observation
  10. GRB 080319b: Early IR Imaging from PAIRITEL
  11. GRB080319B Liverpool Telescope optical afterglow candidate
  12. GRB 080319B: Super-LOTIS Detection of a Bright OT
  13. GRB 080319B: REM observations
  14. GRB 080319B: KAIT OA
  15. GRB080319A: P60 Optical Afterglow Observations
  16. GRB 080319B: UVOT Position
  17. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  18. GRB 080319A: Swift detection of a burst
  19. Swift Trigger 306745 is not a GRB
  20. Swift Trigger 306616 is not a GRB
  21. GRB080310, LBT and MDM photometry
  22. GRB080315: Bok Optical Observations
  23. Swift/UVOT observations of GRB 080315
  24. Swift trigger 306323: Swift-BAT/XRT refined analysis
  25. SAX J1818.6-1703: Swift detection (trigger 306379)
  26. GRB 080315: Optical observations
  27. GRB 080315: TAROT Calern observatory optical observations
  28. GRB 080315: Swift detection of a possible burst
  29. GRB080310 : Lulin Optical observations
  30. GRB080310, unusual slow decay in the optical
  31. GRB 080310: GAO 150cm telescope Optical Observation
  32. GRB080310 : Optical observations by LOAO and Lulin
  33. GRB 080310: ROTSE-III Observations of Optical Counterpart
  34. GRB080310: Optical observation by MITSuME telescope
  35. GRB080310, optical observations with the LBT
  36. GRB 080307: GAO 150cm telescope Optical Observation
  37. GRB 080229A: GAO 150cm telescope Optical Observation
  38. GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
  39. GRB 080307: NIR upper limit
  40. GRB 080229: NIR upper limit
  41. GRB 080310: early RAPTOR multicolor observations
  42. GRB 080310, Swift-BAT refined analysis
  43. GRB080210: optical observations
  44. GRB080307: optical upper limit
  45. GRB 080310: Swift-XRT refined analysis
  46. GRB 080310: Swift/UVOT Refined Analysis
  47. GRB 080310: Redshift from Keck/DEIMOS Spectra
  48. GRB 080310 - SDSS Pre-Burst Observations
  49. GRB080310 : Lulin optical observation
  50. GRB 080310: Enhanced Swift-XRT position
  51. GRB 080310: RRM optical photometry with the VLT
  52. GRB080310, detection of break in optical
  53. GRB 080310: VLT/UVES spectroscopy
  54. GRB080310, optical observations with LBT
  55. GRB 080310: Magellan redshift revision
  56. GRB 080310: Lick/Kast Spectroscopy
  57. GRB080310: Super-LOTIS suggestion of brightening
  58. GRB 080310, SMARTS optical/IR afterglow observations
  59. GRB 080310: REM observations
  60. GRB 080310: Magellan redshift
  61. GRB 080310 afterglow candidate (correction to UT time)
  62. GRB 080310: Swift detection of a burst with optical afterglow
  63. GRB 080310 afterglow candidate
  64. GRB080229, optical upper limit (Correction)
  65. GRB080307, optical upper limit
  66. GRB080307 BOAO optical afterglow observation - detection of a possible OT
  67. GRB080229, optical upper limit
  68. GRB 080307: Swift-XRT Team refined analysis
  69. GRB 080307: Swift/UVOT Upper Limits
  70. GRB 080307: Early RAPTOR Limits
  71. GRB 080307, Swift-BAT refined analysis
  72. GRB080307 - SDSS Pre-Burst Observations
  73. GRB 080307: TNT optical observation
  74. GRB080307: Optical upper limits
  75. GRB 080307: Gemini-N i-band observations - candidate afterglow
  76. GRB 080307: BOAO imaging - retraction and new limit
  77. GRB 080307: retraction of UVOT candidate
  78. GRB 080307: Enhanced Swift-XRT position
  79. GRB 080307, Preliminary Swift-BAT refined analysis
  80. GRB 080307 : BOAO optical afterglow observation
  81. GRB 080307: Optical observation with DMC/KANATA
  82. GRB 080307: Swift detection of a burst
  83. VLA possible radio detection of GRB 080229
  84. GRB 080303: Swift/UVOT follow-up of afterglow detection
  85. GRB 080303, Swift-BAT refined analysis
  86. GRB 080303: Rapid PROMPT Detections
  87. GRB080303: Swift XRT refined analysis
  88. GRB 080303: Enhanced Swift-XRT position
  89. Swift UVOT observations of GRB080229B
  90. GRB080229B: Swift XRT afterglow observation
  91. GRB 080303A: Faulkes Telescope South optical afterglow observations
  92. GRB 080303
  93. GRB 080303: Swift detection of a burst with optical afterglow
  94. GRB 080303: REM NIR afterglow candidate
  95. GRB 080303A: ROTSE-III Optical Limits
  96. GRB 080229: I-band observations from OSN
  97. GRB 080229: VLT NIR observations
  98. GRB080229: Swift XRT refined analysis
  99. GRB 080229: TNG NIR observations
  100. GRB 080229: Deep Gemini/GMOS optical observations

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