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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"

42652 results found.

  1. GRB110731A: Swift/UVOT Observations
  2. GRB 110731A: Fermi GBM observation
  3. GRB 110731A: NOT photometry
  4. GRB 110731A: Enhanced Swift-XRT position
  5. Fermi-LAT Detection of GRB110731A
  6. GRB 110731A: Swift-BAT refined analysis
  7. GRB 110731A: FTN+FTS afterglow observations
  8. GRB 110731A: Swift detection of a burst with an optical counterpart
  9. Sw J1644+57 (GRB 110328A): Continued VLBA Observations
  10. INTEGRAL Weak trigger #6331: GRT Optical Observation
  11. GRB 110721A: Swift observations of afterglow candidate
  12. AXP 4U 0142+61: Swift-BAT refined analysis
  13. GRB 110726A: optical upper limit in CrAO
  14. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  15. GRB 110726A: EVLA observations
  16. GRB 110726A: IAC80 R-band observations
  17. GRB 110726A: ROTSE-III refined analysis, fast decay in early phase
  18. GRB 110726A: Further Swift/UVOT Observations
  19. GRB110726A: Gemini-N tentative redshift
  20. GRB 110726A: Swift-BAT refined analysis
  21. GRB 110726A: Enhanced Swift-XRT position
  22. GRB 110726A: Swift/UVOT Detection
  23. GRB 110726A: Liverpool Telescope observations
  24. GRB 110726: ROTSE-III Detection of Optical Counterpart
  25. GRB 110726A: Swift detection of a burst
  26. IPN triangulation of GRB 110721A
  27. GRB 110721A: Preliminary Swift/UVOT Upper Limits
  28. GRB 110721A: Gemini-South spectroscopy of the potential optical counterpart
  29. GRB 110721A: potential counterpart candidate
  30. Konus-Wind observation of GRB 110721A
  31. GRB 110709B / EVLA detection of radio counterpart
  32. GRB 110719A / SMA 345 GHz upper limits
  33. GRB 110721A: Fermi-LAT detection
  34. GRB 110721A: Fermi GBM detection
  35. Recent GCN/Swift-BAT Slew Burst Position notices are due to playback debugging
  36. GRB110715A: spectral lag analysis
  37. GRB 110715A : Suzaku WAM observation of the prompt emission
  38. GRB 110719A: GRT Optical Observation
  39. GRB 110719A: z-band upper limit
  40. Swift J1822.3-1606 : Fermi GBM observation
  41. GRB 110719A: Swift-XRT refined Analysis
  42. GRB 110719A: optical upper limit
  43. GRB 110719A: Enhanced Swift-XRT position
  44. GRB 110719A: Swift-BAT refined analysis
  45. GRB 110715A optical observations
  46. GRB 110719A: Swift detection of a burst
  47. GRB 110709B : Suzaku WAM observation of the prompt emission
  48. GRB 110715A: ATCA detection of the radio counterpart
  49. Swift J1822.3-1606: Transient Magnetar or Be X-ray Binary?
  50. GRB110715A: GROND Detection of the Optical/NIR Afterglow
  51. GRB 110715A: APEX detection of the submm counterpart
  52. Swift J1822.3-1606
  53. Konus-Wind observation of GRB 110715A
  54. GRB 110715A: Swift-XRT refined Analysis
  55. GRB110715A: VLT redshift
  56. Swift J1822.3-1606: Swift-XRT detection of the X-ray counterpart
  57. GRB 110715A: Enhanced Swift-XRT position
  58. GRB 110715A: Swift-BAT refined analysis
  59. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  60. GRB 110715A: Swift detection of a bright burst with an optical counterpart
  61. GRB 110709B: Swift/UVOT Observations
  62. GRB 110709A / EVLA upper limits
  63. GRB 110709B: Additional Gemini observations and deep limits on an optical afterglow
  64. Swift trigger 457076 is not a GRB
  65. Konus-Wind observation of GRB 110708B
  66. GRB 110709A: Suzaku WAM observation of the prompt emission
  67. GRB 110709B: Submm observations from APEX
  68. IPN triangulation of GRB 110708B (long duration, extremely intense)
  69. Swift Trigger 457076: a possible GRB
  70. GRB 110709A: Swift/UVOT Upper Limits
  71. Fermi Gamma-ray Burst Monitor trigger 332078586 is not a GRB
  72. GRB 110709A: Konkoly observations
  73. GRB 110708A: Konkoly observations
  74. GRB 110709B BAT refined analysis
  75. GRB 110709B: burst detection from Swift-BAT slew data
  76. GRB 110709B: Swift-XRT refined Analysis
  77. GRB 110709A: Swift-XRT refined Analysis
  78. GRB 110709B: Swift/UVOT Detection of Possible Optical Flaring
  79. Konus-Wind observation of GRB 110709A
  80. GRB 110709B: Enhanced Swift-XRT position
  81. Konus-Wind observation of GRB 110709B
  82. GRB110709A: upper limits from CAHA 1.23m and OSN 1.5m
  83. GRB 110709A: Fermi GBM observation
  84. GRB 110709B: Gemini-South additional analysis and photometry
  85. GRB 110709B : A possible source in USNO B 1.0
  86. GRB 110709B: Preliminary Swift-BAT refined analysis
  87. GRB 110709B: GROND Detection of an Afterglow Candidate
  88. GRB 110709B: Gemini-South optical observations
  89. GRB 110709A: Swift-BAT refined analysis
  90. GRB 110709B: possible quiescent source in DSS
  91. GRB 110709A : Xinglong TNT upper limit
  92. GRB 110709B: Swift detection of renewed activity at T+11 minutes.
  93. GRB 110709A: Enhanced Swift-XRT position
  94. GRB 110709B: Swift detection of a burst
  95. GRB 110708A: Swift/UVOT Observations
  96. GRB 110709A: MASTER-NET optical observations
  97. GRB 110709A: Prompt enhanced Swift-XRT position
  98. GRB 110709A: Swift detection of a burst
  99. GRB 110708A: Liverpool Telescope observations
  100. GRB 110708A: Lick observations

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