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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"

20544 results found.

  1. GRB 110715A: APEX detection of the submm counterpart
  2. GRB 110715A: Swift/UVOT Detection
  3. GRB 110715A: Enhanced Swift-XRT position
  4. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  5. GRB 110715A: Swift detection of a bright burst with an optical counterpart
  6. GRB 110709B: Swift/UVOT Observations
  7. Swift trigger 457076 is not a GRB
  8. GRB 110709B: Submm observations from APEX
  9. IPN triangulation of GRB 110708B (long duration, extremely intense)
  10. Swift Trigger 457076: a possible GRB
  11. GRB 110709A: Swift/UVOT Upper Limits
  12. GRB 110709A: Konkoly observations
  13. GRB 110708A: Konkoly observations
  14. GRB 110709B BAT 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: GROND Detection of an Afterglow Candidate
  19. GRB 110709B: Gemini-South optical observations
  20. GRB 110709A: Enhanced Swift-XRT position
  21. GRB 110709B: Swift detection of a burst
  22. GRB 110708A: Swift/UVOT Observations
  23. GRB 110709A: Swift detection of a burst
  24. GRB 110708A: Swift/XRT afterglow candidate for the INTEGRAL burst
  25. IPN triangulation of short hard GRB 110705A
  26. Swift trigger 456780 is not a burst
  27. GRB 110705A: Fermi GBM detection
  28. Swift Trigger 456659 is probably not astrophysical
  29. Swift-BAT trigger 456532 is not astrophysical
  30. SGR 1E 1841-045: early optical limit by "Pi of the Sky"
  31. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  32. Swift J185003.2-005627: 1.23m CAHA and BOOTES-3 observations
  33. GRB 110625A: Fermi GBM and LAT observations
  34. GRB 110625A: Swift/UVOT Upper Limits
  35. GRB 110625A: 1.23m CAHA I-band observations
  36. GRB 110625A: Fermi LAT detection
  37. GRB 110625A: GROND detection of a source inside the XRT error circle
  38. GRB 110625A: Konkoly observations
  39. GRB 110625A: Swift-XRT refined Analysis
  40. Swift J185003.2-005627: NIR Observation
  41. GRB 110625A: Swift detection of a burst
  42. Swift J185003.2-005627: Swift-XRT/UVOT refined analysis
  43. Swift J185003.2-005627: Swift-BAT refined analysis
  44. Swift J185003.2-005627: TAROT La Silla observatory optical observations
  45. Swift J185003.2-005627: TAROT Calern observatory optical observations
  46. Swift J185003.2-005627: Swift detection of a burst from a new Galactic transient
  47. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  48. Konus-Wind observation of GRB 110618A
  49. IPN triangulation of GRB110618A (long duration, extremely intense)
  50. GRB 110610A: 1.23m CAHA optical observations
  51. GRB 110610A: Swift/UVOT Upper Limits
  52. GRB 110610A: Enhanced Swift-XRT position
  53. Swift detection of the X-ray afterglow of GRB 110604A
  54. GRB 110610A: Swift detection of a burst
  55. GRB 110604A Detection by IPN Spacecraft and Swift-BAT
  56. GMRT detection of GRB 110328A
  57. GRB 110530A: Swift/UVOT Detection of a Fading Afterglow
  58. GRB 110530A: Enhanced Swift-XRT position
  59. GRB 110530A: NOT optical observations
  60. GRB110530A: MITSuME Okayama Optical Observation
  61. GRB 110530A: Swift detection of a burst with an optical afterglow
  62. LAT Observations of GRB110529A
  63. EVLA afterglow limits on the high z GRB090429B
  64. Swift J1644+57/GRB 110328A, Additional HST Observations
  65. GRB 110521A: MASTER prompt optical limit
  66. GRB 110521A: Swift/UVOT Upper Limits
  67. GRB 110520A: NOT optical follow-ups
  68. GRB 110521A - NOT optical observation
  69. GRB 110521A: Enhanced Swift-XRT position
  70. GRB 110521A: MASTER synchronous and early optical observations limit
  71. Swift/UVOT observations of GRB110520A
  72. GRB 110521A: Swift detection of a burst
  73. GRB 110520A: Swift-BAT refined analysis
  74. GRB 110520A: IAC80 I-band observations
  75. GRB 110520A: Enhanced Swift-XRT position
  76. GRB 110520A: WHT IR observations
  77. GRB 110520A - NOT optical observation
  78. GRB 110520A: TAROT Calern observatory optical observations
  79. GRB 110520A: Swift detection of a burst
  80. IPN localization of bright GRB 110518A
  81. GRB 110519A, Swift-BAT refined analysis
  82. GRB 110503A optical observation
  83. GRB 110503A: TAROT Calern observatory optical observations
  84. Konus-Wind observation of GRB 110503A
  85. GRB 110503A: optical observation in CrAO
  86. GRB 110503A: Centimeter observation from EVLA
  87. GRB 110503A: Millimeter observation from SMA
  88. GRB 110503A: SARA-N Observations and Photometric Calibration
  89. GRB 110503A: Swift/UVOT Observations
  90. GRB 110503A: PAIRITEL NIR Detection
  91. GRB 110503A: Swift-BAT refined analysis
  92. GRB 110503A: Enhanced Swift-XRT position
  93. GRB 110503A: Swift detection of a burst with a bright optical counterpart
  94. GRB 110426A: Swift/XRT non-detection
  95. GRB 110428A : X-ray afterglow confirmation
  96. GRB 110428A: Suzaku WAM observation of the prompt emission
  97. GRB 110422A: optical observations in CrAO
  98. GRB 110428A : Swift-XRT observations
  99. GRB 110426A: MASTER synchronous with MAXI/GSC observations
  100. GRB 110422A: optical observations in CrAO, second epoch

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