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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"

25559 results found.

  1. GRB 090123: GROND detection
  2. GRB 090123: Swift XRT refined analysis
  3. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  4. GRB 090123: Swift-BAT refined analysis
  5. GRB090123: Enhanced Swift-XRT position
  6. GRB 090123: Swift detection of a burst
  7. AXP 1E1547.0-5408: long bursts with INTEGRAL SPI-ACS
  8. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  9. GRB 090117C: Suzaku WAM observation of the prompt emission
  10. AXP 1E1547.0-5408: Fermi GBM observations
  11. Trigger 340734: Swift detection of a possible short burst
  12. AXP 1E1547.0-5408 activity with SGR bursts
  13. GRB 090118: Subaru NIR Observation
  14. GRB 090118 (BATSS): GRT Optical Observation
  15. GRB 090118: Possible burst detection from Swift-BAT slew data
  16. GRB 090117: confirmation of the X-ray afterglow
  17. GRB 090117C - Fermi GRB Detection
  18. GRB 090117 - Fermi GBM Observations
  19. GRB090117: Swift-XRT detection of a possible candidate afterglow
  20. GRB 090117 - SuperAGILE Localization of a long GRB
  21. GRB 090112B: Suzaku WAM observation of the prompt emission
  22. GRB 090113: LOAO Detection Limits in R, I, z, Y-band
  23. GRB 090113: GROND Upper Limits
  24. GRB 090113: Swift-XRT refined analysis
  25. GRB 090113: Enhanced Swift-XRT position
  26. GRB 090113: Swift-BAT refined analysis
  27. GRB 090112B: Fermi GBM Detection
  28. GRB 090113: Swift detection of a burst
  29. GRB 090112: Fermi GBM detection
  30. GRB 090109: Fermi GBM detection
  31. GRB 090108B: Fermi GBM detection
  32. GRB 090111, Swift-BAT refined analysis
  33. GRB 090108: Fermi GBM Detection
  34. GRB 090111: Swift-XRT refined analysis
  35. GRB 090111: Enhanced Swift-XRT position
  36. GRB 090111: Swift detection of a burst
  37. GRB 090107B: Suzaku WAM observation of the prompt emission
  38. GRB090107B: Fermi GBM Detection
  39. GRB 090107B: Swift XRT afterglow confirmation
  40. GRB 090107B: a long GRB localized by INTEGRAL
  41. Fermi/GBM detection of GRB 081226A
  42. Fermi/GBM detection of GRB 081225
  43. GRB 090107: Swift-BAT refined analysis
  44. GRB 090107: Swift detection of a burst
  45. GRB 081231: Fermi GBM Detection
  46. GRB 090102: optical decay
  47. VLA radio upper limit on GRB 090102
  48. GRB 090102: GRT Optical Observation
  49. Konus-Wind observation of GRB 090102
  50. GRB 081229: Fermi GBM detection
  51. GRB 090102: Hobby-Eberly Telescope Spectroscopy
  52. GRB 090102: P60 Imaging and P200 Spectroscopy
  53. GRB 090102: GROND observations of the optical afterglow
  54. Swift UVOT observations of GRB 090102
  55. GRB 090102: Swift-BAT refined analysis
  56. GRB 090102: Swift burst of interest
  57. GRB 090102: Swift XRT refined analysis
  58. GRB 090102: NOT redshift
  59. GRB 090102: Enhanced Swift-XRT position
  60. GRB 090102: TAROT Calern observatory optical light curve
  61. GRB 090102: REM observations of a bright afterglow
  62. GRB 090102: Swift detection of a burst with an optical counterpart
  63. GRB 090102: TAROT Calern observatory optical observations
  64. GRB 081230, Swift-BAT refined analysis
  65. GRB081230: Swift-XRT refined analysis
  66. GRB 081230 Swift/UVOT Observations
  67. GRB 081230: Enhanced Swift-XRT position
  68. GRB 081230: Swift detection of a burst
  69. GRB 081228: GROND confirmation of the optical/NIR afterglow
  70. GRB 081226B: Fermi GBM observation
  71. GRB 081226C: Fermi GBM detection
  72. GRB 081228, Swift-BAT refined analysis
  73. VLA radio detection of GRB 081221
  74. GRB 081228: Swift/UVOT Upper Limits
  75. GRB 081228: Swift-XRT Team refined analysis
  76. GRB 081228: detection by GROND
  77. GRB 081228: Enhanced Swift-XRT position
  78. GRB 081228: TAROT Calern observatory optical observations
  79. GRB 081228: Swift detection of a burst
  80. VLA radio observation of GRB 081221
  81. GRB 081224: Suzaku WAM observation of the prompt emission
  82. GRB 081226: Swift-XRT refined analysis
  83. GRB 081226A: Swift-BAT refined analysis
  84. GRB 081226B: a short-hard GRB detected by INTEGRAL
  85. GRB 081226: Gemini-South imaging
  86. GRB 081226: Swift detection of a possible short-hard burst
  87. GRB 080810: optical observations
  88. GRB 080810: optical observations
  89. Konus-Wind observation of GRB 081222
  90. GRB 081223: Fermi GBM detection
  91. GRB 081221: GROND observations
  92. GRB 081222:Optical afterglow observation
  93. VLA radio upper limit on GRB 081222
  94. GRB 081222: Fermi GBM observation
  95. GRB 081221: Probable host galaxy in Keck imaging
  96. GRB 081204C: Fermi GBM detection
  97. GRB 081222, Swift-BAT refined analysis
  98. GRB 081221, Swift-BAT refined analysis
  99. GRB081222 optical limit by "Pi of the Sky"
  100. Konus-Wind observation of very bright GRB 081215A

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