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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"

42434 results found.

  1. RXTE Discovery of the Spin Period of Swift J1834.9-0846
  2. GRB 110808A: Swift/UVOT Detection
  3. GRB 110808A: Swift-BAT refined analysis
  4. GRB 110808A: Swift-XRT refined Analysis
  5. SGR J1834.9-0846: A Neutron Star in W41?
  6. Swift SGR 1834.9-0846: Swift-BAT refined analysis
  7. GRB 110808A: VLT/X-shooter spectroscopy
  8. GRB 110808A: Enhanced Swift-XRT position
  9. GRB 110808A: Swift detection of a burst with optical counterpart
  10. Fermi GBM detection of a SGR-like burst
  11. GRB 110807A: SAO RAS observations
  12. GRB 110807A: Swift detection of a burst or a posible new SGR
  13. GRB 110726A: two epochs of SAO RAS optical observations
  14. Reprocessed enhanced Swift-XRT positions and GRB products
  15. Konus-Wind observation of GRB 110802A
  16. GRB 110801A: optical observations in CrAO
  17. EVLA observation for Fermi burst GRB 110721A
  18. GRB 110731A : Suzaku WAM observation of the prompt emission
  19. GRB 110726A: Swift-XRT refined Analysis
  20. GRB110731A: MOA optical observations of the steeply fading afterglow
  21. GRB 110801A: SAO RAS optical observations
  22. GRB110801A: MITSuME Ishigakijima Optical Observation at 1 day after the burst
  23. GRB 110801A: Evidence for a jet break
  24. GRB 110801A: MASTER OT observations
  25. GRB 110801A: Swift-BAT refined analysis
  26. Swift/UVOT observations of GRB110801A
  27. GRB 110801A: Swift-XRT refined Analysis
  28. GRB 110801A: Afterglow redshift from 10.4m GTC
  29. GRB110801A: MITSuME Ishigakijima Optical Observation
  30. GRB 110801A: Enhanced Swift-XRT position
  31. GRB 110801A: TLS Optical afterglow confirmation
  32. GRB 110801A: Swift detection of a burst with an optical counterpart
  33. GRB 110731A / EVLA upper limits
  34. GRB110731A: MITSuME Ishigakijima Optical Upper Limits
  35. GRB 110731A Gemini-N redshift
  36. GRB 110731A: Swift-XRT refined Analysis
  37. Konus-Wind observation of GRB 110731A
  38. GRB110731A: Swift/UVOT Observations
  39. GRB 110731A: Fermi GBM observation
  40. GRB 110731A: NOT photometry
  41. GRB 110731A: Enhanced Swift-XRT position
  42. Fermi-LAT Detection of GRB110731A
  43. GRB 110731A: Swift-BAT refined analysis
  44. GRB 110731A: FTN+FTS afterglow observations
  45. GRB 110731A: Swift detection of a burst with an optical counterpart
  46. Sw J1644+57 (GRB 110328A): Continued VLBA Observations
  47. INTEGRAL Weak trigger #6331: GRT Optical Observation
  48. GRB 110721A: Swift observations of afterglow candidate
  49. GRB 110726A: optical upper limit in CrAO
  50. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  51. GRB 110726A: EVLA observations
  52. GRB 110726A: IAC80 R-band observations
  53. GRB 110726A: ROTSE-III refined analysis, fast decay in early phase
  54. GRB110726A: MITSuME Ishigakijima Optical Observation
  55. GRB 110726A: Further Swift/UVOT Observations
  56. GRB110726A: Gemini-N tentative redshift
  57. GRB 110726A: Swift-BAT refined analysis
  58. GRB 110726A: Enhanced Swift-XRT position
  59. GRB 110726A: Swift/UVOT Detection
  60. GRB 110726A: Liverpool Telescope observations
  61. GRB 110726: ROTSE-III Detection of Optical Counterpart
  62. GRB 110726A: Swift detection of a burst
  63. GRB 110721A: Preliminary Swift/UVOT Upper Limits
  64. GRB 110721A: Gemini-South spectroscopy of the potential optical counterpart
  65. GRB 110721A: potential counterpart candidate
  66. Konus-Wind observation of GRB 110721A
  67. GRB 110709B / EVLA detection of radio counterpart
  68. GRB 110719A / SMA 345 GHz upper limits
  69. GRB 110721A: Fermi-LAT detection
  70. GRB 110721A: Fermi GBM detection
  71. GRB110715A: spectral lag analysis
  72. GRB 110715A : Suzaku WAM observation of the prompt emission
  73. GRB 110719A: GRT Optical Observation
  74. GRB 110719A: optical limit by "Pi of the Sky"
  75. GRB 110719A: z-band upper limit
  76. Swift/UVOT observations of GRB110719A
  77. Swift J1822.3-1606 : Fermi GBM observation
  78. GRB 110719A: Swift-XRT refined Analysis
  79. GRB 110719A: optical upper limit
  80. GRB 110719A: Enhanced Swift-XRT position
  81. GRB 110719A: Swift-BAT refined analysis
  82. GRB 110715A optical observations
  83. GRB 110719A: Swift detection of a burst
  84. GRB 110709B : Suzaku WAM observation of the prompt emission
  85. GRB 110715A: ATCA detection of the radio counterpart
  86. Swift J1822.3-1606: Transient Magnetar or Be X-ray Binary?
  87. GRB110715A: GROND Detection of the Optical/NIR Afterglow
  88. GRB 110715A: APEX detection of the submm counterpart
  89. Swift J1822.3-1606
  90. Konus-Wind observation of GRB 110715A
  91. GRB 110715A: Swift-XRT refined Analysis
  92. GRB110715A: VLT redshift
  93. Swift J1822.3-1606: Swift-XRT detection of the X-ray counterpart
  94. GRB 110715A: Swift/UVOT Detection
  95. GRB 110715A: Enhanced Swift-XRT position
  96. GRB 110715A: Swift-BAT refined analysis
  97. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  98. GRB 110715A: Swift detection of a bright burst with an optical counterpart
  99. GRB 110709A / EVLA upper limits
  100. GRB 110709B: Additional Gemini observations and deep limits on an optical afterglow

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