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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"

36348 results found.

  1. GRB 110801A: Evidence for a jet break
  2. GRB 110801A: MASTER OT observations
  3. GRB 110801A: Swift-BAT refined analysis
  4. Swift/UVOT observations of GRB110801A
  5. GRB 110801A: Swift-XRT refined Analysis
  6. GRB 110801A: Afterglow redshift from 10.4m GTC
  7. GRB110801A: MITSuME Ishigakijima Optical Observation
  8. GRB 110801A: Enhanced Swift-XRT position
  9. AXP 4U 0142+61: Fermi GBM detection
  10. GRB 110801A: TLS Optical afterglow confirmation
  11. GRB 110801A: ROTSE-III Detection of re-brightening from OT
  12. GRB 110801A: Swift detection of a burst with an optical counterpart
  13. GRB 110731A / EVLA upper limits
  14. GRB110731A: MITSuME Ishigakijima Optical Upper Limits
  15. GRB 110731A Gemini-N redshift
  16. GRB 110731A: Swift-XRT refined Analysis
  17. Konus-Wind observation of GRB 110731A
  18. GRB110731A: Swift/UVOT Observations
  19. GRB 110731A: Fermi GBM observation
  20. GRB 110731A: NOT photometry
  21. GRB 110731A: Enhanced Swift-XRT position
  22. Fermi-LAT Detection of GRB110731A
  23. GRB 110731A: Swift-BAT refined analysis
  24. GRB 110731A: FTN+FTS afterglow observations
  25. GRB 110731A: Swift detection of a burst with an optical counterpart
  26. Sw J1644+57 (GRB 110328A): Continued VLBA Observations
  27. GRB 110721A: Swift observations of afterglow candidate
  28. GRB 110726A: optical upper limit in CrAO
  29. GRB 110726A: EVLA observations
  30. GRB 110726A: IAC80 R-band observations
  31. GRB 110726A: ROTSE-III refined analysis, fast decay in early phase
  32. GRB110726A: MITSuME Ishigakijima Optical Observation
  33. GRB 110726A: Further Swift/UVOT Observations
  34. GRB110726A: Gemini-N tentative redshift
  35. GRB 110726A: Swift-BAT refined analysis
  36. GRB 110726A: Enhanced Swift-XRT position
  37. GRB 110726A: Swift/UVOT Detection
  38. GRB 110726A: Liverpool Telescope observations
  39. GRB 110726: ROTSE-III Detection of Optical Counterpart
  40. GRB 110726A: Swift detection of a burst
  41. IPN triangulation of GRB 110721A
  42. GRB 110721A: Preliminary Swift/UVOT Upper Limits
  43. GRB 110721A: Gemini-South spectroscopy of the potential optical counterpart
  44. GRB 110721A: potential counterpart candidate
  45. Konus-Wind observation of GRB 110721A
  46. GRB 110709B / EVLA detection of radio counterpart
  47. GRB 110719A / SMA 345 GHz upper limits
  48. GRB 110721A: Fermi-LAT detection
  49. GRB 110721A: Fermi GBM detection
  50. GRB110715A: spectral lag analysis
  51. GRB 110715A : Suzaku WAM observation of the prompt emission
  52. GRB 110719A: GRT Optical Observation
  53. GRB 110719A: optical limit by "Pi of the Sky"
  54. GRB 110719A: z-band upper limit
  55. Swift/UVOT observations of GRB110719A
  56. GRB 110719A: Swift-XRT refined Analysis
  57. GRB 110719A: optical upper limit
  58. GRB 110719A: Enhanced Swift-XRT position
  59. GRB 110719A: Swift-BAT refined analysis
  60. GRB 110715A optical observations
  61. GRB 110719A: Swift detection of a burst
  62. GRB 110709B : Suzaku WAM observation of the prompt emission
  63. GRB 110715A: ATCA detection of the radio counterpart
  64. GRB110715A: GROND Detection of the Optical/NIR Afterglow
  65. GRB 110715A: APEX detection of the submm counterpart
  66. Konus-Wind observation of GRB 110715A
  67. GRB 110715A: Swift-XRT refined Analysis
  68. GRB110715A: VLT redshift
  69. GRB 110715A: Swift/UVOT Detection
  70. GRB 110715A: Enhanced Swift-XRT position
  71. GRB 110715A: Swift-BAT refined analysis
  72. GRB 110715A: Swift detection of a bright burst with an optical counterpart
  73. GRB 110709B: Swift/UVOT Observations
  74. GRB 110709A / EVLA upper limits
  75. GRB 110709B: Additional Gemini observations and deep limits on an optical afterglow
  76. Swift trigger 457076 is not a GRB
  77. Konus-Wind observation of GRB 110708B
  78. GRB 110709A: Suzaku WAM observation of the prompt emission
  79. GRB 110709B: Submm observations from APEX
  80. IPN triangulation of GRB 110708B (long duration, extremely intense)
  81. Swift Trigger 457076: a possible GRB
  82. GRB 110709A: Swift/UVOT Upper Limits
  83. Fermi Gamma-ray Burst Monitor trigger 332078586 is not a GRB
  84. GRB 110709A: Konkoly observations
  85. GRB 110708A: Konkoly observations
  86. GRB 110709B BAT refined analysis
  87. GRB 110709B: burst detection from Swift-BAT slew data
  88. GRB 110709B: Swift-XRT refined Analysis
  89. GRB 110709A: Swift-XRT refined Analysis
  90. GRB 110709B: Swift/UVOT Detection of Possible Optical Flaring
  91. GRB110709A: MITSuME Ishigakijima Optical upper limits
  92. Konus-Wind observation of GRB 110709A
  93. GRB 110709B: correction to GCN 12135 (Konus-Wind peak flux)
  94. GRB 110709B: Enhanced Swift-XRT position
  95. Konus-Wind observation of GRB 110709B
  96. GRB 110709A: Fermi GBM observation
  97. GRB 110709B: Gemini-South additional analysis and photometry
  98. GRB 110709B : A possible source in USNO B 1.0
  99. GRB 110709B: Preliminary Swift-BAT refined analysis
  100. GRB 110709B: GROND Detection of an Afterglow Candidate

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