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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"

36099 results found.

  1. GRB 110726: ROTSE-III Detection of Optical Counterpart
  2. GRB 110726A: Swift detection of a burst
  3. IPN triangulation of GRB 110721A
  4. GRB 110721A: Preliminary Swift/UVOT Upper Limits
  5. GRB 110721A: Gemini-South spectroscopy of the potential optical counterpart
  6. GRB 110721A: potential counterpart candidate
  7. Konus-Wind observation of GRB 110721A
  8. GRB 110709B / EVLA detection of radio counterpart
  9. GRB 110719A / SMA 345 GHz upper limits
  10. GRB 110721A: Fermi-LAT detection
  11. GRB 110721A: Fermi GBM detection
  12. GRB110715A: spectral lag analysis
  13. GRB 110715A : Suzaku WAM observation of the prompt emission
  14. GRB 110719A: GRT Optical Observation
  15. GRB 110719A: optical limit by "Pi of the Sky"
  16. GRB 110719A: z-band upper limit
  17. Swift/UVOT observations of GRB110719A
  18. GRB 110719A: Swift-XRT refined Analysis
  19. GRB 110719A: optical upper limit
  20. GRB 110719A: Enhanced Swift-XRT position
  21. GRB 110719A: Swift-BAT refined analysis
  22. GRB 110715A optical observations
  23. GRB 110719A: Swift detection of a burst
  24. GRB 110709B : Suzaku WAM observation of the prompt emission
  25. GRB 110715A: ATCA detection of the radio counterpart
  26. GRB110715A: GROND Detection of the Optical/NIR Afterglow
  27. GRB 110715A: APEX detection of the submm counterpart
  28. Konus-Wind observation of GRB 110715A
  29. GRB 110715A: Swift-XRT refined Analysis
  30. GRB110715A: VLT redshift
  31. GRB 110715A: Swift/UVOT Detection
  32. GRB 110715A: Enhanced Swift-XRT position
  33. GRB 110715A: Swift-BAT refined analysis
  34. GRB 110715A: Swift detection of a bright burst with an optical counterpart
  35. GRB 110709B: Swift/UVOT Observations
  36. GRB 110709A / EVLA upper limits
  37. GRB 110709B: Additional Gemini observations and deep limits on an optical afterglow
  38. Swift trigger 457076 is not a GRB
  39. Konus-Wind observation of GRB 110708B
  40. GRB 110709A: Suzaku WAM observation of the prompt emission
  41. GRB 110709B: Submm observations from APEX
  42. IPN triangulation of GRB 110708B (long duration, extremely intense)
  43. Swift Trigger 457076: a possible GRB
  44. GRB 110709A: Swift/UVOT Upper Limits
  45. Fermi Gamma-ray Burst Monitor trigger 332078586 is not a GRB
  46. GRB 110709A: Konkoly observations
  47. GRB 110708A: Konkoly observations
  48. GRB 110709B BAT refined analysis
  49. GRB 110709B: burst detection from Swift-BAT slew data
  50. GRB 110709B: Swift-XRT refined Analysis
  51. GRB 110709A: Swift-XRT refined Analysis
  52. GRB 110709B: Swift/UVOT Detection of Possible Optical Flaring
  53. GRB110709A: MITSuME Ishigakijima Optical upper limits
  54. Konus-Wind observation of GRB 110709A
  55. GRB 110709B: correction to GCN 12135 (Konus-Wind peak flux)
  56. GRB 110709B: Enhanced Swift-XRT position
  57. Konus-Wind observation of GRB 110709B
  58. GRB 110709A: Fermi GBM observation
  59. GRB 110709B: Gemini-South additional analysis and photometry
  60. GRB 110709B : A possible source in USNO B 1.0
  61. GRB 110709B: Preliminary Swift-BAT refined analysis
  62. GRB 110709B: GROND Detection of an Afterglow Candidate
  63. GRB 110709B: Gemini-South optical observations
  64. GRB 110709A: Swift-BAT refined analysis
  65. GRB 110709B: possible quiescent source in DSS
  66. GRB 110709A : Xinglong TNT upper limit
  67. GRB 110709B: Swift detection of renewed activity at T+11 minutes.
  68. GRB 110709A: Enhanced Swift-XRT position
  69. GRB 110709B: Swift detection of a burst
  70. GRB 110708A: Swift/UVOT Observations
  71. GRB 110709A: MASTER-NET optical observations
  72. GRB 110709A: Prompt enhanced Swift-XRT position
  73. GRB 110709A: Swift detection of a burst
  74. GRB 110708A: Liverpool Telescope observations
  75. GRB 110708A: Lick observations
  76. GRB 110708A: Swift/XRT afterglow candidate for the INTEGRAL burst
  77. GRB 110705A: Suzaku WAM observation of the prompt emission
  78. GRB 110625A, the review of the sky area in plate archives
  79. GRB 110708A: a long GRB detected by INTEGRAL
  80. Konus-Wind observation of GRB 110705A
  81. IPN triangulation of short hard GRB 110705A
  82. GRB 110705A: Fermi GBM detection
  83. GRB 110625A: Suzaku WAM observation of the prompt emission
  84. GRB 110625A: Fermi GBM and LAT observations
  85. GRB 110625A: Swift/UVOT Upper Limits
  86. GRB 110625A: 1.23m CAHA I-band observations
  87. GRB 110625A: Fermi LAT detection
  88. GRB 110625A: GROND detection of a source inside the XRT error circle
  89. GRB 110625A: NIR Source
  90. GRB 110625A: Konkoly observations
  91. Konus-Wind observation of GRB 110625A
  92. GRB 110625A: Swift-XRT refined Analysis
  93. GRB 110625A: Swift-BAT refined analysis
  94. GRB 110625A: ROTSE-III Optical Limits
  95. GRB 110625A: Swift detection of a burst
  96. Swift J185003.2-005627: TAROT La Silla observatory optical observations
  97. Swift J185003.2-005627: TAROT Calern observatory optical observations
  98. Swift J185003.2-005627: Swift detection of a burst from a new Galactic transient
  99. GRB 110618A: SMARTS optical observations
  100. GRB 110604A: final update on Swift-XRT observations

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