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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"

37682 results found.

  1. Konus-Wind observation of GRB 090102
  2. GRB 081229: Fermi GBM detection
  3. GRB 090102: Hobby-Eberly Telescope Spectroscopy
  4. GRB 090102: P60 Imaging and P200 Spectroscopy
  5. GRB 090102 Observations from IAC80
  6. GRB 090102: GROND observations of the optical afterglow
  7. Swift UVOT observations of GRB 090102
  8. GRB 090102: Swift-BAT refined analysis
  9. GRB 090102: Swift burst of interest
  10. GRB 090102: Swift XRT refined analysis
  11. GRB 090102: NOT redshift
  12. GRB 090102: Enhanced Swift-XRT position
  13. GRB 090102: TAROT Calern observatory optical light curve
  14. GRB 090102: REM observations of a bright afterglow
  15. GRB 090102: Swift detection of a burst with an optical counterpart
  16. GRB 090102: TAROT Calern observatory optical observations
  17. GRB 081230: GROND confirmation of the afterglow
  18. GRB 081230, Swift-BAT refined analysis
  19. GRB081230: Swift-XRT refined analysis
  20. GRB 081230 Swift/UVOT Observations
  21. GRB 081230: Enhanced Swift-XRT position
  22. GRB 081230: Swift/UVOT Detection of an Optical Afterglow
  23. GRB 081230: ROTSE-III Detection of Optical Counterpart
  24. GRB 081230: Swift detection of a burst
  25. GRB 081228: GROND confirmation of the optical/NIR afterglow
  26. GRB 081226B: Fermi GBM observation
  27. GRB 081226C: Fermi GBM detection
  28. GRB 081228, Swift-BAT refined analysis
  29. VLA radio detection of GRB 081221
  30. GRB 081228: Swift/UVOT Upper Limits
  31. GRB 081228: Swift-XRT Team refined analysis
  32. GRB 081228: detection by GROND
  33. GRB 081228: Enhanced Swift-XRT position
  34. GRB 081228: TAROT Calern observatory optical observations
  35. GRB 081228: Swift detection of a burst
  36. VLA radio observation of GRB 081221
  37. GRB 081226B: Swift XRT and UVOT upper limits
  38. GRB 081224: Suzaku WAM observation of the prompt emission
  39. GRB 081226: Swift-XRT refined analysis
  40. GRB 081226A: Swift UVOT Upper Limits
  41. GRB 081226: Second epoch of Gemini-South imaging
  42. GRB 081226A: Swift-BAT refined analysis
  43. GRB 081226B: a short-hard GRB detected by INTEGRAL
  44. GRB 081226: Gemini-South spectrum of possible afterglow
  45. GRB 081226: Gemini-South imaging
  46. GRB 081226: GROND afterglow candidate
  47. GRB 081226: ROTSE-III Optical Limits
  48. GRB 081226: Swift detection of a possible short-hard burst
  49. GRB 080810: optical observations
  50. GRB 081211B: optical observations
  51. GRB081224: LAT retraction
  52. GRB 081224: Swift-XRT observation
  53. GRB 081222: MITSuME optical observation
  54. GRB 081224: Fermi GBM Detection & LAT Localization
  55. GRB 080810: optical observations
  56. Konus-Wind observation of GRB 081222
  57. GRB 081223: Fermi GBM detection
  58. GRB 081221: GROND observations
  59. GRB 081222: Gemini-N confirmation of redshift z=2.77
  60. GRB 081222:Optical afterglow observation
  61. VLA radio upper limit on GRB 081222
  62. GRB 081222: Fermi GBM observation
  63. Fermi Gamma-ray Burst Monitor trigger 251687595 reclassification
  64. GRB 081222: Gemini-South absorption redshift
  65. GRB 081221: Probable host galaxy in Keck imaging
  66. GRB 081204C: Fermi GBM detection
  67. GRB 081222, Swift-BAT refined analysis
  68. GRB 081221, Swift-BAT refined analysis
  69. GRB081222 optical limit by "Pi of the Sky"
  70. Konus-Wind observation of very bright GRB 081215A
  71. GRB 081222: Swift XRT refined analysis
  72. GRB081221: Fermi GBM observation
  73. Swift/UVOT observations of GRB 081221
  74. IPN triangulation of bright GRB 081215A
  75. GRB 081221: Swift-XRT Refined Analysis
  76. GRB 081221: pseudo-redshift (pz=0.7) from the spectral parameters of the prompt emission
  77. GRB 081222: Faulkes Telescope South observations
  78. GRB 081221: Gemini-N nIR imaging
  79. GRB081203A: BTA observation
  80. Konus-Wind observation of GRB 081221
  81. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  82. GRB081222: REM candidate afterglow
  83. GRB 081222: Swift detection of a burst with a bright optical afterglow
  84. GRB 081221: Enhanced Swift-XRT position
  85. GRB 081221: further NOT observations
  86. GRB 081221: NOT observations
  87. GRB 081221: Swift detection of a burst
  88. GRB 081217: Fermi GBM detection
  89. GRB081215A: Fermi-LAT observations
  90. GRB 081211B: Further Swift-XRT analysis
  91. GRB 081215B: Fermi GBM detection
  92. GRB 081216: Suzaku WAM observation of the prompt emission
  93. GRB 081216 : Fermi GBM observation
  94. GRB 081215A: Fermi GBM detection (correction to event fluence)
  95. GRB 081215A: Fermi GBM detection
  96. IPN localization of short hard GRB 081216
  97. GRB 081211B - possibly a short burst with extended emission
  98. GRB 081118: Zadko observations
  99. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  100. GRB 081215A: Gamma Repeater?

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