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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"

37296 results found.

  1. GRB 110726A: two epochs of SAO RAS optical observations
  2. Reprocessed enhanced Swift-XRT positions and GRB products
  3. Konus-Wind observation of GRB 110802A
  4. Fermi GBM trigger 334123030 (110804165) is not a GRB
  5. IPN triangulation of GRB110802A (short/hard burst)
  6. GRB 110801A: optical observations in CrAO
  7. EVLA observation for Fermi burst GRB 110721A
  8. GRB 110731A : Suzaku WAM observation of the prompt emission
  9. GRB 110726A: Swift-XRT refined Analysis
  10. GRB110731A: MOA optical observations of the steeply fading afterglow
  11. GRB 110801A: SAO RAS optical observations
  12. GRB110801A: MITSuME Ishigakijima Optical Observation at 1 day after the burst
  13. GRB 110801A: Evidence for a jet break
  14. GRB 110801A: MASTER OT observations
  15. GRB 110801A: Swift-BAT refined analysis
  16. Swift/UVOT observations of GRB110801A
  17. GRB 110801A: Swift-XRT refined Analysis
  18. GRB 110801A: Afterglow redshift from 10.4m GTC
  19. GRB110801A: MITSuME Ishigakijima Optical Observation
  20. GRB 110801A: Enhanced Swift-XRT position
  21. AXP 4U 0142+61: Fermi GBM detection
  22. GRB 110801A: TLS Optical afterglow confirmation
  23. GRB 110801A: ROTSE-III Detection of re-brightening from OT
  24. GRB 110801A: Swift detection of a burst with an optical counterpart
  25. GRB 110731A / EVLA upper limits
  26. GRB110731A: MITSuME Ishigakijima Optical Upper Limits
  27. GRB 110731A Gemini-N redshift
  28. GRB 110731A: Swift-XRT refined Analysis
  29. Konus-Wind observation of GRB 110731A
  30. GRB110731A: Swift/UVOT Observations
  31. GRB 110731A: Fermi GBM observation
  32. GRB 110731A: NOT photometry
  33. GRB 110731A: Enhanced Swift-XRT position
  34. Fermi-LAT Detection of GRB110731A
  35. GRB 110731A: Swift-BAT refined analysis
  36. GRB 110731A: FTN+FTS afterglow observations
  37. GRB 110731A: Swift detection of a burst with an optical counterpart
  38. Sw J1644+57 (GRB 110328A): Continued VLBA Observations
  39. GRB 110721A: Swift observations of afterglow candidate
  40. GRB 110726A: optical upper limit in CrAO
  41. GRB 110726A: EVLA observations
  42. GRB 110726A: IAC80 R-band observations
  43. GRB 110726A: ROTSE-III refined analysis, fast decay in early phase
  44. GRB110726A: MITSuME Ishigakijima Optical Observation
  45. GRB 110726A: Further Swift/UVOT Observations
  46. GRB110726A: Gemini-N tentative redshift
  47. GRB 110726A: Swift-BAT refined analysis
  48. GRB 110726A: Enhanced Swift-XRT position
  49. GRB 110726A: Swift/UVOT Detection
  50. GRB 110726A: Liverpool Telescope observations
  51. GRB 110726: ROTSE-III Detection of Optical Counterpart
  52. GRB 110726A: Swift detection of a burst
  53. IPN triangulation of GRB 110721A
  54. GRB 110721A: Preliminary Swift/UVOT Upper Limits
  55. GRB 110721A: Gemini-South spectroscopy of the potential optical counterpart
  56. GRB 110721A: potential counterpart candidate
  57. Konus-Wind observation of GRB 110721A
  58. GRB 110709B / EVLA detection of radio counterpart
  59. GRB 110719A / SMA 345 GHz upper limits
  60. GRB 110721A: Fermi-LAT detection
  61. GRB 110721A: Fermi GBM detection
  62. GRB110715A: spectral lag analysis
  63. GRB 110715A : Suzaku WAM observation of the prompt emission
  64. GRB 110719A: GRT Optical Observation
  65. GRB 110719A: optical limit by "Pi of the Sky"
  66. GRB 110719A: z-band upper limit
  67. Swift/UVOT observations of GRB110719A
  68. GRB 110719A: Swift-XRT refined Analysis
  69. GRB 110719A: optical upper limit
  70. GRB 110719A: Enhanced Swift-XRT position
  71. GRB 110719A: Swift-BAT refined analysis
  72. GRB 110715A optical observations
  73. GRB 110719A: Swift detection of a burst
  74. GRB 110709B : Suzaku WAM observation of the prompt emission
  75. GRB 110715A: ATCA detection of the radio counterpart
  76. GRB110715A: GROND Detection of the Optical/NIR Afterglow
  77. GRB 110715A: APEX detection of the submm counterpart
  78. Konus-Wind observation of GRB 110715A
  79. GRB 110715A: Swift-XRT refined Analysis
  80. GRB110715A: VLT redshift
  81. Swift J1822.3-1606: Swift-XRT detection of the X-ray counterpart
  82. GRB 110715A: Swift/UVOT Detection
  83. GRB 110715A: Enhanced Swift-XRT position
  84. GRB 110715A: Swift-BAT refined analysis
  85. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  86. GRB 110715A: Swift detection of a bright burst with an optical counterpart
  87. GRB 110709B: Swift/UVOT Observations
  88. GRB 110709A / EVLA upper limits
  89. GRB 110709B: Additional Gemini observations and deep limits on an optical afterglow
  90. Swift trigger 457076 is not a GRB
  91. Konus-Wind observation of GRB 110708B
  92. GRB 110709A: Suzaku WAM observation of the prompt emission
  93. GRB 110709B: Submm observations from APEX
  94. IPN triangulation of GRB 110708B (long duration, extremely intense)
  95. Swift Trigger 457076: a possible GRB
  96. GRB 110709A: Swift/UVOT Upper Limits
  97. Fermi Gamma-ray Burst Monitor trigger 332078586 is not a GRB
  98. GRB 110709A: Konkoly observations
  99. GRB 110708A: Konkoly observations
  100. GRB 110709B BAT refined analysis

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