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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"

28260 results found.

  1. GRB 110709B: Swift/UVOT Observations
  2. GRB 110709B: Additional Gemini observations and deep limits on an optical afterglow
  3. Swift trigger 457076 is not a GRB
  4. GRB 110709A: Suzaku WAM observation of the prompt emission
  5. GRB 110709B: Submm observations from APEX
  6. IPN triangulation of GRB 110708B (long duration, extremely intense)
  7. Swift Trigger 457076: a possible GRB
  8. GRB 110709A: Swift/UVOT Upper Limits
  9. GRB 110709A: Konkoly observations
  10. GRB 110708A: Konkoly observations
  11. GRB 110709B BAT refined analysis
  12. GRB 110709B: burst detection from Swift-BAT slew data
  13. GRB 110709B: Swift-XRT refined Analysis
  14. GRB 110709A: Swift-XRT refined Analysis
  15. GRB 110709B: Swift/UVOT Detection of Possible Optical Flaring
  16. GRB110709A: MITSuME Ishigakijima Optical upper limits
  17. GRB 110709B: Enhanced Swift-XRT position
  18. GRB 110709B: Gemini-South additional analysis and photometry
  19. GRB 110709B: Preliminary Swift-BAT refined analysis
  20. GRB 110709B: GROND Detection of an Afterglow Candidate
  21. GRB 110709B: Gemini-South optical observations
  22. GRB 110709A: Swift-BAT refined analysis
  23. GRB 110709B: possible quiescent source in DSS
  24. GRB 110709B: Swift detection of renewed activity at T+11 minutes.
  25. GRB 110709A: Enhanced Swift-XRT position
  26. GRB 110709B: Swift detection of a burst
  27. GRB 110708A: Swift/UVOT Observations
  28. GRB 110709A: Swift detection of a burst
  29. GRB 110708A: Liverpool Telescope observations
  30. GRB 110708A: Lick observations
  31. GRB 110708A: Swift/XRT afterglow candidate for the INTEGRAL burst
  32. GRB 110705A: Suzaku WAM observation of the prompt emission
  33. GRB 110625A, the review of the sky area in plate archives
  34. IPN triangulation of short hard GRB 110705A
  35. Swift trigger 456780 is not a burst
  36. GRB 110705A: Fermi GBM detection
  37. Swift Trigger 456659 is probably not astrophysical
  38. Swift-BAT trigger 456532 is not astrophysical
  39. SGR 1E 1841-045: early optical limit by "Pi of the Sky"
  40. SGR 1E 1841-045: Swift-BAT refined analysis
  41. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  42. GRB 110625A: Suzaku WAM observation of the prompt emission
  43. Swift J185003.2-005627: 1.23m CAHA and BOOTES-3 observations
  44. GRB 110625A: Fermi GBM and LAT observations
  45. GRB 110625A: Swift/UVOT Upper Limits
  46. GRB 110625A: 1.23m CAHA I-band observations
  47. GRB 110625A: Fermi LAT detection
  48. GRB 110625A: GROND detection of a source inside the XRT error circle
  49. GRB 110625A: Konkoly observations
  50. GRB 110625A: Swift-XRT refined Analysis
  51. GRB 110625A: Swift-BAT refined analysis
  52. Swift J185003.2-005627: NIR Observation
  53. GRB 110625A: Swift detection of a burst
  54. Swift J185003.2-005627: Swift-XRT/UVOT refined analysis
  55. Swift J185003.2-005627: Swift-BAT refined analysis
  56. Swift J185003.2-005627: TAROT La Silla observatory optical observations
  57. Swift J185003.2-005627: TAROT Calern observatory optical observations
  58. Swift J185003.2-005627: Swift detection of a burst from a new Galactic transient
  59. SGR 1E 1841-045: Swift-BAT refined analysis
  60. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  61. IPN triangulation of GRB110618A (long duration, extremely intense)
  62. GRB 110604A: Suzaku WAM observation of the prompt emission
  63. GRB 110610A: Suzaku WAM observation of the prompt emission
  64. GRB 110610A: Fermi GBM detection
  65. GRB 110610A: 1.23m CAHA optical observations
  66. GRB 110610A: Swift-XRT refined Analysis
  67. GRB 110610A: Swift/UVOT Upper Limits
  68. GRB 110610A: Enhanced Swift-XRT position
  69. GRB 110610A: Swift-BAT refined analysis
  70. Swift detection of the X-ray afterglow of GRB 110604A
  71. GRB 110610A: Swift detection of a burst
  72. GRB 110604A Detection by IPN Spacecraft and Swift-BAT
  73. GRB 110529A: Suzaku WAM observation of the prompt emission
  74. GMRT detection of GRB 110328A
  75. GRB 110530A: Swift-XRT refined Analysis
  76. GRB 110530A: Swift/UVOT Detection of a Fading Afterglow
  77. GRB 110530A: Enhanced Swift-XRT position
  78. GRB 110530A: NOT optical observations
  79. GRB110530A: MITSuME Okayama Optical Observation
  80. GRB 110530A: Swift-BAT refined analysis
  81. GRB 110529A: Fermi GBM detection
  82. GRB 110530A: Swift detection of a burst with an optical afterglow
  83. LAT Observations of GRB110529A
  84. EVLA afterglow limits on the high z GRB090429B
  85. Swift J1644+57/GRB 110328A, Additional HST Observations
  86. GRB 110521A: MASTER prompt optical limit
  87. GRB 110521A: Swift/UVOT Upper Limits
  88. GRB 110521A: Swift-XRT refined analysis
  89. GRB 110520A: NOT optical follow-ups
  90. GRB 110521A - NOT optical observation
  91. GRB 110521A: Swift-BAT refined analysis
  92. GRB 110521A: Enhanced Swift-XRT position
  93. GRB 110521A: MASTER synchronous and early optical observations limit
  94. Swift/UVOT observations of GRB110520A
  95. GRB 110521A: Swift detection of a burst
  96. GRB 110520A: Swift-BAT refined analysis
  97. GRB 110520A: IAC80 I-band observations
  98. GRB 110520A: Swift-XRT refined Analysis
  99. GRB 110520A: Enhanced Swift-XRT position
  100. GRB 110520A: WHT IR observations

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