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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"

37288 results found.

  1. GRB 110726A: Swift-XRT refined Analysis
  2. GRB110731A: MOA optical observations of the steeply fading afterglow
  3. GRB 110801A: SAO RAS optical observations
  4. GRB110801A: MITSuME Ishigakijima Optical Observation at 1 day after the burst
  5. GRB 110801A: Evidence for a jet break
  6. GRB 110801A: MASTER OT observations
  7. GRB 110801A: Swift-BAT refined analysis
  8. Swift/UVOT observations of GRB110801A
  9. GRB 110801A: Swift-XRT refined Analysis
  10. GRB 110801A: Afterglow redshift from 10.4m GTC
  11. GRB110801A: MITSuME Ishigakijima Optical Observation
  12. GRB 110801A: Enhanced Swift-XRT position
  13. AXP 4U 0142+61: Fermi GBM detection
  14. GRB 110801A: TLS Optical afterglow confirmation
  15. GRB 110801A: ROTSE-III Detection of re-brightening from OT
  16. GRB 110801A: Swift detection of a burst with an optical counterpart
  17. GRB 110731A / EVLA upper limits
  18. GRB110731A: MITSuME Ishigakijima Optical Upper Limits
  19. GRB 110731A Gemini-N redshift
  20. GRB 110731A: Swift-XRT refined Analysis
  21. Konus-Wind observation of GRB 110731A
  22. GRB110731A: Swift/UVOT Observations
  23. GRB 110731A: Fermi GBM observation
  24. GRB 110731A: NOT photometry
  25. GRB 110731A: Enhanced Swift-XRT position
  26. Fermi-LAT Detection of GRB110731A
  27. GRB 110731A: Swift-BAT refined analysis
  28. GRB 110731A: FTN+FTS afterglow observations
  29. GRB 110731A: Swift detection of a burst with an optical counterpart
  30. Sw J1644+57 (GRB 110328A): Continued VLBA Observations
  31. GRB 110721A: Swift observations of afterglow candidate
  32. GRB 110726A: optical upper limit in CrAO
  33. GRB 110726A: EVLA observations
  34. GRB 110726A: IAC80 R-band observations
  35. GRB 110726A: ROTSE-III refined analysis, fast decay in early phase
  36. GRB110726A: MITSuME Ishigakijima Optical Observation
  37. GRB 110726A: Further Swift/UVOT Observations
  38. GRB110726A: Gemini-N tentative redshift
  39. GRB 110726A: Swift-BAT refined analysis
  40. GRB 110726A: Enhanced Swift-XRT position
  41. GRB 110726A: Swift/UVOT Detection
  42. GRB 110726A: Liverpool Telescope observations
  43. GRB 110726: ROTSE-III Detection of Optical Counterpart
  44. GRB 110726A: Swift detection of a burst
  45. IPN triangulation of GRB 110721A
  46. GRB 110721A: Preliminary Swift/UVOT Upper Limits
  47. GRB 110721A: Gemini-South spectroscopy of the potential optical counterpart
  48. GRB 110721A: potential counterpart candidate
  49. Konus-Wind observation of GRB 110721A
  50. GRB 110709B / EVLA detection of radio counterpart
  51. GRB 110719A / SMA 345 GHz upper limits
  52. GRB 110721A: Fermi-LAT detection
  53. GRB 110721A: Fermi GBM detection
  54. GRB110715A: spectral lag analysis
  55. GRB 110715A : Suzaku WAM observation of the prompt emission
  56. GRB 110719A: GRT Optical Observation
  57. GRB 110719A: optical limit by "Pi of the Sky"
  58. GRB 110719A: z-band upper limit
  59. Swift/UVOT observations of GRB110719A
  60. GRB 110719A: Swift-XRT refined Analysis
  61. GRB 110719A: optical upper limit
  62. GRB 110719A: Enhanced Swift-XRT position
  63. GRB 110719A: Swift-BAT refined analysis
  64. GRB 110715A optical observations
  65. GRB 110719A: Swift detection of a burst
  66. GRB 110709B : Suzaku WAM observation of the prompt emission
  67. GRB 110715A: ATCA detection of the radio counterpart
  68. GRB110715A: GROND Detection of the Optical/NIR Afterglow
  69. GRB 110715A: APEX detection of the submm counterpart
  70. Konus-Wind observation of GRB 110715A
  71. GRB 110715A: Swift-XRT refined Analysis
  72. GRB110715A: VLT redshift
  73. Swift J1822.3-1606: Swift-XRT detection of the X-ray counterpart
  74. GRB 110715A: Swift/UVOT Detection
  75. GRB 110715A: Enhanced Swift-XRT position
  76. GRB 110715A: Swift-BAT refined analysis
  77. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  78. GRB 110715A: Swift detection of a bright burst with an optical counterpart
  79. GRB 110709B: Swift/UVOT Observations
  80. GRB 110709A / EVLA upper limits
  81. GRB 110709B: Additional Gemini observations and deep limits on an optical afterglow
  82. Swift trigger 457076 is not a GRB
  83. Konus-Wind observation of GRB 110708B
  84. GRB 110709A: Suzaku WAM observation of the prompt emission
  85. GRB 110709B: Submm observations from APEX
  86. IPN triangulation of GRB 110708B (long duration, extremely intense)
  87. Swift Trigger 457076: a possible GRB
  88. GRB 110709A: Swift/UVOT Upper Limits
  89. Fermi Gamma-ray Burst Monitor trigger 332078586 is not a GRB
  90. GRB 110709A: Konkoly observations
  91. GRB 110708A: Konkoly observations
  92. GRB 110709B BAT refined analysis
  93. GRB 110709B: burst detection from Swift-BAT slew data
  94. GRB 110709B: Swift-XRT refined Analysis
  95. GRB 110709A: Swift-XRT refined Analysis
  96. GRB 110709B: Swift/UVOT Detection of Possible Optical Flaring
  97. GRB110709A: MITSuME Ishigakijima Optical upper limits
  98. Konus-Wind observation of GRB 110709A
  99. GRB 110709B: correction to GCN 12135 (Konus-Wind peak flux)
  100. GRB 110709B: Enhanced Swift-XRT position

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