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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"

42768 results found.

  1. GRB 080319B: Super-LOTIS Detection of a Bright OT
  2. GRB 080319B: REM observations
  3. GRB 080319B: KAIT OA
  4. GRB080319A: P60 Optical Afterglow Observations
  5. GRB 080319B: UVOT Position
  6. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  7. GRB 080319A: Swift detection of a burst
  8. Swift Trigger 306745 is not a GRB
  9. Swift Trigger 306616 is not a GRB
  10. GRB080310, LBT and MDM photometry
  11. GRB080315: Bok Optical Observations
  12. Swift/UVOT observations of GRB 080315
  13. Swift trigger 306323: Swift-BAT/XRT refined analysis
  14. SAX J1818.6-1703: Swift detection (trigger 306379)
  15. GRB 080315: TAROT Calern observatory optical observations
  16. GRB 080315: Swift detection of a possible burst
  17. GRB080310 : Lulin Optical observations
  18. GRB080310, unusual slow decay in the optical
  19. GRB 080310: GAO 150cm telescope Optical Observation
  20. GRB080310 : Optical observations by LOAO and Lulin
  21. GRB 080310: ROTSE-III Observations of Optical Counterpart
  22. GRB080310: Optical observation by MITSuME telescope
  23. GRB080310, optical observations with the LBT
  24. GRB 080307: GAO 150cm telescope Optical Observation
  25. GRB 080229A: GAO 150cm telescope Optical Observation
  26. GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
  27. GRB 080307: NIR upper limit
  28. GRB 080229: NIR upper limit
  29. GRB 080310: early RAPTOR multicolor observations
  30. GRB 080310: Swift-XRT refined analysis
  31. GRB 080310: Swift/UVOT Refined Analysis
  32. GRB 080310: Redshift from Keck/DEIMOS Spectra
  33. GRB 080310 - SDSS Pre-Burst Observations
  34. GRB080310 : Lulin optical observation
  35. GRB 080310: Enhanced Swift-XRT position
  36. GRB 080310: RRM optical photometry with the VLT
  37. GRB080310, detection of break in optical
  38. GRB 080310: VLT/UVES spectroscopy
  39. GRB080310, optical observations with LBT
  40. GRB 080310: Magellan redshift revision
  41. GRB080310: Super-LOTIS suggestion of brightening
  42. GRB 080310, SMARTS optical/IR afterglow observations
  43. GRB 080310: REM observations
  44. GRB 080310: Magellan redshift
  45. GRB 080310 afterglow candidate (correction to UT time)
  46. GRB 080310: Swift detection of a burst with optical afterglow
  47. GRB 080310 afterglow candidate
  48. GRB080307 BOAO optical afterglow observation - detection of a possible OT
  49. GRB 080307: Swift-XRT Team refined analysis
  50. GRB 080307: Early RAPTOR Limits
  51. GRB 080307, Swift-BAT refined analysis
  52. GRB080307 - SDSS Pre-Burst Observations
  53. GRB 080307: TNT optical observation
  54. GRB080307: Optical upper limits
  55. GRB 080307: BOAO imaging - retraction and new limit
  56. GRB 080307: retraction of UVOT candidate
  57. GRB 080307: Enhanced Swift-XRT position
  58. GRB 080307, Preliminary Swift-BAT refined analysis
  59. GRB 080307 : BOAO optical afterglow observation
  60. GRB 080307: Optical observation with DMC/KANATA
  61. GRB 080307: Swift detection of a burst
  62. VLA possible radio detection of GRB 080229
  63. GRB 080303: Swift/UVOT follow-up of afterglow detection
  64. GRB 080303, Swift-BAT refined analysis
  65. GRB 080303: Rapid PROMPT Detections
  66. GRB080303: Swift XRT refined analysis
  67. GRB 080303: Enhanced Swift-XRT position
  68. Swift UVOT observations of GRB080229B
  69. GRB080229B: Swift XRT afterglow observation
  70. GRB 080303A: Faulkes Telescope South optical afterglow observations
  71. GRB 080303
  72. GRB 080303: Swift detection of a burst with optical afterglow
  73. GRB 080303A: ROTSE-III Optical Limits
  74. GRB 080229: I-band observations from OSN
  75. GRB 080229: VLT NIR observations
  76. GRB080229: Swift XRT refined analysis
  77. GRB 080229: TNG NIR observations
  78. GRB 080229: Enhanced Swift-XRT position
  79. GRB080229: Possible optical afterglow
  80. GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
  81. UVOT analysis for GRB080229
  82. GRB 080229, Swift-BAT refined analysis
  83. GRB 080229A: ROTSE-III Optical Limits
  84. GRB 080229: Swift detection of a bright burst
  85. Early optical shallow decay in GRB 071112C
  86. GRB080205: optical observations
  87. GRB080211: optical observations
  88. XRF 080109/SN2008D : GMRT upper limit at 1.28 GHz
  89. GRB 071010B : Early optical brightening detected by TAOS
  90. Swift-XRT improved positions, and new redshift limits.
  91. ESO optical and NIR observations of GRB 080218B
  92. GRB 080204: Suzaku WAM observation of the prompt emission
  93. GRB 080218B, Swift-BAT refined analysis
  94. GRB 080218B: Swift-XRT refined analysis
  95. GRB 080218B: REM NIR early upper limits
  96. GRB 080212: Mount Abu NIR observations
  97. GRB 080218B: Enhanced Swift-XRT position
  98. GRB 080218B: GROND upper limits
  99. GRB 080218b, SMARTS optical/IR limits
  100. GRB 080218A, Swift-BAT refined analysis

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