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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"

11836 results found.

  1. GRB 090424: Swift-XRT refined analysis
  2. GRB 090424: Fermi GBM Observation
  3. GRB 090423 limiting magnitudes
  4. GRB 090423: UKIRT K-band observations
  5. GRB 090423: P60 Observations
  6. GRB 090423: Swift detection of a burst
  7. GRB 090418A: Konus-Wind and Swift/BAT joint spectral analysis
  8. GRB 090418B: RTT150 optical observations
  9. GRB 090418A: RTT150 optical observations
  10. GRB 090418B: GROND observations
  11. Konus-Wind observation of GRB 090418B
  12. GRB 090418A: ROTSE-III Refined Analysis
  13. GRB 090418: Swift detection of a burst with optical afterglow
  14. GRB 090411B: Suzaku WAM observation of the prompt emission
  15. GRB 090411A: Suzaku WAM observation of the prompt emission
  16. GRB 090417B: MITSuME Okayama optical upper limits
  17. GRB 090417B: Swift detection of a burst
  18. GRB 090411A: Fermi GBM detection
  19. Konus-Wind and Konus-RF observations of GRB 090408b
  20. GRB 090409: Fermi GBM detection
  21. GRB 090407: GROND upper limits
  22. GRB 090407: Swift-XRT refined analysis
  23. Konus-Wind and Konus-RF observations of GRB 090406
  24. GRB 090407: ROTSE-III Optical Limits
  25. GRB 090407: Swift detection of a burst
  26. GRB 090404: NOT observations
  27. GRB 090404: Swift-XRT Team refined analysis
  28. Konus-Wind observation of GRB 090401B
  29. GRB 090328: Fermi-LAT refined analysis
  30. GRB 090331: Fermi GBM detection
  31. Konus-Wind observation of GRB 090401A
  32. Swift/UVOT detection of GRB090401B
  33. GRB 090401B: Swift detection of a burst
  34. GRB 090328B: MASTER-Irkutsk prompt optical short burst observations
  35. GRB 090401, Swift-BAT refined analysis
  36. GRB 090328: Swift XRT refined analysis
  37. Konus-Wind observation of GRB 090328
  38. Fermi LAT and GBM detections of GRB090328
  39. Konus-Wind observation of GRB 090323
  40. GRB 090324: SuperAGILE Localization of a Long GRB
  41. GRB 090323: P60 Afterglow Confirmation
  42. GRB 090320C: Fermi GBM Detection
  43. Fermi GBM and LAT detections of GRB 090323
  44. GRB 090320B: Fermi GBM detection.
  45. GRB 090320A: Fermi GBM detection
  46. GRB 090313: WSRT Radio Detection
  47. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  48. GRB 090313: VLT spectroscopy
  49. Konus-Wind observation of GRB 090315
  50. GRB 090313: TAROT La Silla observatory optical detection
  51. GRB 090313: Gemini-S redshift
  52. GRB 090313: Swift-BAT refined analysis
  53. GRB 090313: Sustained optical brightness
  54. GRB090305B: Fermi GBM detection
  55. GRB 090308: Swift-XRT refined analysis
  56. GRB 090308: Swift detection of a burst
  57. GRB 090307: Swift-BAT refined analysis of trigger 345551
  58. GRB 090306: Swift detection of a possible burst
  59. GRB 090228B: Fermi GBM detection
  60. Konus-Wind observation of bright short GRB 090227B
  61. IPN localization of short bright GRB 090227B
  62. Konus-Wind observation of GRB 090301A
  63. GRB 090301A: Swift-BAT refined analysis
  64. Swift_BAT_Lightcurve Notice for Trigger Number 344565 is not valid
  65. GRB 090227: Fermi GBM detection
  66. Ongoing activity of AXP/SGR 1E1547.0-5408
  67. Konus-Wind observation of GRB 090217
  68. GRB090217: Fermi-LAT Detection
  69. SGR activity seen by BAT during ICSP Ionospheric Events
  70. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  71. Fermi Gamma-ray Burst Monitor trigger 255729682 is not a GRB
  72. GRB 090205: VLT spectroscopic redshift
  73. GRB 090205: Swift detection of a burst
  74. Konus-Wind observation of GRB 090201
  75. GRB 090201: Swift-XRT refined analysis
  76. GRB 090201: Swift-BAT refined analysis
  77. GRB090113: MAGIC telescope GeV observation
  78. GRB 090201: ROTSE-III Optical Limits
  79. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  80. GRB 090129: Swift detection of a burst
  81. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  82. GRB 090126: SuperAGILE Localization of a Long GRB
  83. GRB 090123: Swift/UVOT Observations
  84. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  85. GRB 090118: Subaru NIR Observation
  86. GRB 090118: Swift-XRT observations
  87. GRB090118 Swift/UVOT upper limits
  88. GRB 090118: Possible burst detection from Swift-BAT slew data
  89. GRB 090117 - SuperAGILE Localization of a long GRB
  90. GRB 090113: GROND Upper Limits
  91. GRB 090113: Swift-XRT refined analysis
  92. GRB 090113: Observations from NOT
  93. GRB 090113: ROTSE-III Optical Limits
  94. GRB 090113: Swift detection of a burst
  95. GRB 090112: Fermi GBM detection
  96. GRB 090111: Swift-XRT refined analysis
  97. GRB 090111: Swift detection of a burst
  98. GRB 090107B: Suzaku WAM observation of the prompt emission
  99. GRB090107B: Fermi GBM Detection
  100. GRB 090107B: ROTSE-III Optical Limits

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