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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"

37750 results found.

  1. GRB 110731A: Swift detection of a burst with an optical counterpart
  2. Sw J1644+57 (GRB 110328A): Continued VLBA Observations
  3. GRB 110721A: Swift observations of afterglow candidate
  4. GRB 110726A: optical upper limit in CrAO
  5. GRB 110726A: EVLA observations
  6. GRB 110726A: IAC80 R-band observations
  7. GRB 110726A: ROTSE-III refined analysis, fast decay in early phase
  8. GRB110726A: MITSuME Ishigakijima Optical Observation
  9. GRB 110726A: Further Swift/UVOT Observations
  10. GRB110726A: Gemini-N tentative redshift
  11. GRB 110726A: Swift-BAT refined analysis
  12. GRB 110726A: Enhanced Swift-XRT position
  13. GRB 110726A: Swift/UVOT Detection
  14. GRB 110726A: Liverpool Telescope observations
  15. GRB 110726: ROTSE-III Detection of Optical Counterpart
  16. GRB 110726A: Swift detection of a burst
  17. IPN triangulation of GRB 110721A
  18. GRB 110721A: Preliminary Swift/UVOT Upper Limits
  19. GRB 110721A: Gemini-South spectroscopy of the potential optical counterpart
  20. GRB 110721A: potential counterpart candidate
  21. Konus-Wind observation of GRB 110721A
  22. GRB 110709B / EVLA detection of radio counterpart
  23. GRB 110719A / SMA 345 GHz upper limits
  24. GRB 110721A: Fermi-LAT detection
  25. GRB 110721A: Fermi GBM detection
  26. GRB110715A: spectral lag analysis
  27. GRB 110715A : Suzaku WAM observation of the prompt emission
  28. GRB 110719A: GRT Optical Observation
  29. GRB 110719A: optical limit by "Pi of the Sky"
  30. GRB 110719A: z-band upper limit
  31. Swift/UVOT observations of GRB110719A
  32. Swift J1822.3-1606 : Fermi GBM observation
  33. GRB 110719A: Swift-XRT refined Analysis
  34. GRB 110719A: optical upper limit
  35. GRB 110719A: Enhanced Swift-XRT position
  36. GRB 110719A: Swift-BAT refined analysis
  37. GRB 110715A optical observations
  38. GRB 110719A: Swift detection of a burst
  39. GRB 110709B : Suzaku WAM observation of the prompt emission
  40. GRB 110715A: ATCA detection of the radio counterpart
  41. GRB110715A: GROND Detection of the Optical/NIR Afterglow
  42. GRB 110715A: APEX detection of the submm counterpart
  43. Konus-Wind observation of GRB 110715A
  44. GRB 110715A: Swift-XRT refined Analysis
  45. GRB110715A: VLT redshift
  46. GRB 110715A: Swift/UVOT Detection
  47. GRB 110715A: Enhanced Swift-XRT position
  48. GRB 110715A: Swift-BAT refined analysis
  49. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  50. GRB 110715A: Swift detection of a bright burst with an optical counterpart
  51. GRB 110709B: Swift/UVOT Observations
  52. GRB 110709A / EVLA upper limits
  53. GRB 110709B: Additional Gemini observations and deep limits on an optical afterglow
  54. Swift trigger 457076 is not a GRB
  55. Konus-Wind observation of GRB 110708B
  56. GRB 110709A: Suzaku WAM observation of the prompt emission
  57. GRB 110709B: Submm observations from APEX
  58. IPN triangulation of GRB 110708B (long duration, extremely intense)
  59. Swift Trigger 457076: a possible GRB
  60. GRB 110709A: Swift/UVOT Upper Limits
  61. Fermi Gamma-ray Burst Monitor trigger 332078586 is not a GRB
  62. GRB 110709A: Konkoly observations
  63. GRB 110708A: Konkoly observations
  64. GRB 110709B BAT refined analysis
  65. GRB 110709B: burst detection from Swift-BAT slew data
  66. GRB 110709B: Swift-XRT refined Analysis
  67. GRB 110709A: Swift-XRT refined Analysis
  68. GRB 110709B: Swift/UVOT Detection of Possible Optical Flaring
  69. GRB110709A: MITSuME Ishigakijima Optical upper limits
  70. Konus-Wind observation of GRB 110709A
  71. GRB 110709B: correction to GCN 12135 (Konus-Wind peak flux)
  72. GRB 110709B: Enhanced Swift-XRT position
  73. Konus-Wind observation of GRB 110709B
  74. GRB 110709A: Fermi GBM observation
  75. GRB 110709B: Gemini-South additional analysis and photometry
  76. GRB 110709B : A possible source in USNO B 1.0
  77. GRB 110709B: Preliminary Swift-BAT refined analysis
  78. GRB 110709B: GROND Detection of an Afterglow Candidate
  79. GRB 110709B: Gemini-South optical observations
  80. GRB 110709A: Swift-BAT refined analysis
  81. GRB 110709B: possible quiescent source in DSS
  82. GRB 110709A : Xinglong TNT upper limit
  83. GRB 110709B: Swift detection of renewed activity at T+11 minutes.
  84. GRB 110709A: Enhanced Swift-XRT position
  85. GRB 110709B: Swift detection of a burst
  86. GRB 110708A: Swift/UVOT Observations
  87. GRB 110709A: MASTER-NET optical observations
  88. GRB 110709A: Prompt enhanced Swift-XRT position
  89. GRB 110709A: Swift detection of a burst
  90. GRB 110708A: Liverpool Telescope observations
  91. GRB 110708A: Lick observations
  92. GRB 110708A: Swift/XRT afterglow candidate for the INTEGRAL burst
  93. GRB 110705A: Suzaku WAM observation of the prompt emission
  94. GRB 110625A, the review of the sky area in plate archives
  95. GRB 110708A: a long GRB detected by INTEGRAL
  96. Konus-Wind observation of GRB 110705A
  97. IPN triangulation of short hard GRB 110705A
  98. GRB 110705A: Fermi GBM detection
  99. GRB 110625A: Suzaku WAM observation of the prompt emission
  100. GRB 110625A: Fermi GBM and LAT observations

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