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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"

37768 results found.

  1. GRB110801A: MITSuME Ishigakijima Optical Observation
  2. GRB 110801A: Enhanced Swift-XRT position
  3. AXP 4U 0142+61: Fermi GBM detection
  4. GRB 110801A: TLS Optical afterglow confirmation
  5. GRB 110801A: ROTSE-III Detection of re-brightening from OT
  6. GRB 110801A: Swift detection of a burst with an optical counterpart
  7. GRB 110731A / EVLA upper limits
  8. GRB110731A: MITSuME Ishigakijima Optical Upper Limits
  9. GRB 110731A Gemini-N redshift
  10. GRB 110731A: Swift-XRT refined Analysis
  11. Konus-Wind observation of GRB 110731A
  12. GRB110731A: Swift/UVOT Observations
  13. GRB 110731A: Fermi GBM observation
  14. GRB 110731A: NOT photometry
  15. GRB 110731A: Enhanced Swift-XRT position
  16. Fermi-LAT Detection of GRB110731A
  17. GRB 110731A: Swift-BAT refined analysis
  18. GRB 110731A: FTN+FTS afterglow observations
  19. GRB 110731A: Swift detection of a burst with an optical counterpart
  20. Sw J1644+57 (GRB 110328A): Continued VLBA Observations
  21. GRB 110721A: Swift observations of afterglow candidate
  22. GRB 110726A: optical upper limit in CrAO
  23. GRB 110726A: EVLA observations
  24. GRB 110726A: IAC80 R-band observations
  25. GRB 110726A: ROTSE-III refined analysis, fast decay in early phase
  26. GRB110726A: MITSuME Ishigakijima Optical Observation
  27. GRB 110726A: Further Swift/UVOT Observations
  28. GRB110726A: Gemini-N tentative redshift
  29. GRB 110726A: Swift-BAT refined analysis
  30. GRB 110726A: Enhanced Swift-XRT position
  31. GRB 110726A: Swift/UVOT Detection
  32. GRB 110726A: Liverpool Telescope observations
  33. GRB 110726: ROTSE-III Detection of Optical Counterpart
  34. GRB 110726A: Swift detection of a burst
  35. IPN triangulation of GRB 110721A
  36. GRB 110721A: Preliminary Swift/UVOT Upper Limits
  37. GRB 110721A: Gemini-South spectroscopy of the potential optical counterpart
  38. GRB 110721A: potential counterpart candidate
  39. Konus-Wind observation of GRB 110721A
  40. GRB 110709B / EVLA detection of radio counterpart
  41. GRB 110719A / SMA 345 GHz upper limits
  42. GRB 110721A: Fermi-LAT detection
  43. GRB 110721A: Fermi GBM detection
  44. GRB110715A: spectral lag analysis
  45. GRB 110715A : Suzaku WAM observation of the prompt emission
  46. GRB 110719A: GRT Optical Observation
  47. GRB 110719A: optical limit by "Pi of the Sky"
  48. GRB 110719A: z-band upper limit
  49. Swift/UVOT observations of GRB110719A
  50. Swift J1822.3-1606 : Fermi GBM observation
  51. GRB 110719A: Swift-XRT refined Analysis
  52. GRB 110719A: optical upper limit
  53. GRB 110719A: Enhanced Swift-XRT position
  54. GRB 110719A: Swift-BAT refined analysis
  55. GRB 110715A optical observations
  56. GRB 110719A: Swift detection of a burst
  57. GRB 110709B : Suzaku WAM observation of the prompt emission
  58. GRB 110715A: ATCA detection of the radio counterpart
  59. GRB110715A: GROND Detection of the Optical/NIR Afterglow
  60. GRB 110715A: APEX detection of the submm counterpart
  61. Konus-Wind observation of GRB 110715A
  62. GRB 110715A: Swift-XRT refined Analysis
  63. GRB110715A: VLT redshift
  64. GRB 110715A: Swift/UVOT Detection
  65. GRB 110715A: Enhanced Swift-XRT position
  66. GRB 110715A: Swift-BAT refined analysis
  67. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  68. GRB 110715A: Swift detection of a bright burst with an optical counterpart
  69. GRB 110709B: Swift/UVOT Observations
  70. GRB 110709A / EVLA upper limits
  71. GRB 110709B: Additional Gemini observations and deep limits on an optical afterglow
  72. Swift trigger 457076 is not a GRB
  73. Konus-Wind observation of GRB 110708B
  74. GRB 110709A: Suzaku WAM observation of the prompt emission
  75. GRB 110709B: Submm observations from APEX
  76. IPN triangulation of GRB 110708B (long duration, extremely intense)
  77. Swift Trigger 457076: a possible GRB
  78. GRB 110709A: Swift/UVOT Upper Limits
  79. Fermi Gamma-ray Burst Monitor trigger 332078586 is not a GRB
  80. GRB 110709A: Konkoly observations
  81. GRB 110708A: Konkoly observations
  82. GRB 110709B BAT refined analysis
  83. GRB 110709B: burst detection from Swift-BAT slew data
  84. GRB 110709B: Swift-XRT refined Analysis
  85. GRB 110709A: Swift-XRT refined Analysis
  86. GRB 110709B: Swift/UVOT Detection of Possible Optical Flaring
  87. GRB110709A: MITSuME Ishigakijima Optical upper limits
  88. Konus-Wind observation of GRB 110709A
  89. GRB 110709B: correction to GCN 12135 (Konus-Wind peak flux)
  90. GRB 110709B: Enhanced Swift-XRT position
  91. Konus-Wind observation of GRB 110709B
  92. GRB 110709A: Fermi GBM observation
  93. GRB 110709B: Gemini-South additional analysis and photometry
  94. GRB 110709B : A possible source in USNO B 1.0
  95. GRB 110709B: Preliminary Swift-BAT refined analysis
  96. GRB 110709B: GROND Detection of an Afterglow Candidate
  97. GRB 110709B: Gemini-South optical observations
  98. GRB 110709A: Swift-BAT refined analysis
  99. GRB 110709B: possible quiescent source in DSS
  100. GRB 110709A : Xinglong TNT upper limit

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