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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"

28229 results found.

  1. GRB 110808A: Enhanced Swift-XRT position
  2. GRB 110808A: Swift detection of a burst with optical counterpart
  3. Fermi GBM detection of a SGR-like burst
  4. GRB 110807A: SAO RAS observations
  5. GRB 110807A: Swift detection of a burst or a posible new SGR
  6. GRB 110726A: two epochs of SAO RAS optical observations
  7. IPN triangulation of GRB110802A (short/hard burst)
  8. GRB 110801A: optical observations in CrAO
  9. EVLA observation for Fermi burst GRB 110721A
  10. GRB 110731A : Suzaku WAM observation of the prompt emission
  11. GRB 110726A: Swift-XRT refined Analysis
  12. GRB 110801A: SAO RAS optical observations
  13. GRB110801A: MITSuME Ishigakijima Optical Observation at 1 day after the burst
  14. GRB 110801A: Swift-BAT refined analysis
  15. Swift/UVOT observations of GRB110801A
  16. GRB 110801A: Swift-XRT refined Analysis
  17. GRB110801A: MITSuME Ishigakijima Optical Observation
  18. GRB 110801A: Enhanced Swift-XRT position
  19. GRB 110801A: Swift detection of a burst with an optical counterpart
  20. GRB110731A: MITSuME Ishigakijima Optical Upper Limits
  21. GRB 110731A Gemini-N redshift
  22. GRB 110731A: Swift-XRT refined Analysis
  23. GRB110731A: Swift/UVOT Observations
  24. GRB 110731A: Fermi GBM observation
  25. GRB 110731A: NOT photometry
  26. GRB 110731A: Enhanced Swift-XRT position
  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. INTEGRAL Weak trigger #6331: GRT Optical Observation
  32. GRB 110721A: Swift observations of afterglow candidate
  33. AXP 4U 0142+61: Swift-BAT refined analysis
  34. GRB 110726A: optical upper limit in CrAO
  35. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  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: potential counterpart candidate
  48. GRB 110721A: Fermi-LAT detection
  49. GRB 110721A: Fermi GBM detection
  50. GRB 110715A : Suzaku WAM observation of the prompt emission
  51. GRB 110719A: GRT Optical Observation
  52. GRB 110719A: optical limit by "Pi of the Sky"
  53. GRB 110719A: z-band upper limit
  54. Swift/UVOT observations of GRB110719A
  55. GRB 110719A: Swift-XRT refined Analysis
  56. GRB 110719A: optical upper limit
  57. GRB 110719A: Enhanced Swift-XRT position
  58. GRB 110719A: Swift-BAT refined analysis
  59. GRB 110719A: Swift detection of a burst
  60. GRB 110709B : Suzaku WAM observation of the prompt emission
  61. Swift J1822.3-1606: Transient Magnetar or Be X-ray Binary?
  62. GRB110715A: GROND Detection of the Optical/NIR Afterglow
  63. GRB 110715A: APEX detection of the submm counterpart
  64. GRB 110715A: Swift-XRT refined Analysis
  65. GRB 110715A: Swift/UVOT Detection
  66. GRB 110715A: Enhanced Swift-XRT position
  67. GRB 110715A: Swift-BAT refined analysis
  68. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  69. GRB 110715A: Swift detection of a bright burst with an optical counterpart
  70. GRB 110709B: Swift/UVOT Observations
  71. GRB 110709B: Additional Gemini observations and deep limits on an optical afterglow
  72. Swift trigger 457076 is not a GRB
  73. GRB 110709A: Suzaku WAM observation of the prompt emission
  74. GRB 110709B: Submm observations from APEX
  75. IPN triangulation of GRB 110708B (long duration, extremely intense)
  76. Swift Trigger 457076: a possible GRB
  77. GRB 110709A: Swift/UVOT Upper Limits
  78. GRB 110709A: Konkoly observations
  79. GRB 110708A: Konkoly observations
  80. GRB 110709B BAT refined analysis
  81. GRB 110709B: burst detection from Swift-BAT slew data
  82. GRB 110709B: Swift-XRT refined Analysis
  83. GRB 110709A: Swift-XRT refined Analysis
  84. GRB 110709B: Swift/UVOT Detection of Possible Optical Flaring
  85. GRB110709A: MITSuME Ishigakijima Optical upper limits
  86. GRB 110709B: Enhanced Swift-XRT position
  87. GRB 110709B: Gemini-South additional analysis and photometry
  88. GRB 110709B: Preliminary Swift-BAT refined analysis
  89. GRB 110709B: GROND Detection of an Afterglow Candidate
  90. GRB 110709B: Gemini-South optical observations
  91. GRB 110709A: Swift-BAT refined analysis
  92. GRB 110709B: possible quiescent source in DSS
  93. GRB 110709B: Swift detection of renewed activity at T+11 minutes.
  94. GRB 110709A: Enhanced Swift-XRT position
  95. GRB 110709B: Swift detection of a burst
  96. GRB 110708A: Swift/UVOT Observations
  97. GRB 110709A: Swift detection of a burst
  98. GRB 110708A: Liverpool Telescope observations
  99. GRB 110708A: Lick observations
  100. GRB 110708A: Swift/XRT afterglow candidate for the INTEGRAL burst

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