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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"

20545 results found.

  1. GRB110715A: GROND Detection of the Optical/NIR Afterglow
  2. GRB 110715A: APEX detection of the submm counterpart
  3. GRB 110715A: Swift/UVOT Detection
  4. GRB 110715A: Enhanced Swift-XRT position
  5. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  6. GRB 110715A: Swift detection of a bright burst with an optical counterpart
  7. GRB 110709B: Swift/UVOT Observations
  8. Swift trigger 457076 is not a GRB
  9. GRB 110709B: Submm observations from APEX
  10. IPN triangulation of GRB 110708B (long duration, extremely intense)
  11. Swift Trigger 457076: a possible GRB
  12. GRB 110709A: Swift/UVOT Upper Limits
  13. GRB 110709A: Konkoly observations
  14. GRB 110708A: Konkoly observations
  15. GRB 110709B BAT refined analysis
  16. GRB 110709B: Swift/UVOT Detection of Possible Optical Flaring
  17. GRB110709A: MITSuME Ishigakijima Optical upper limits
  18. GRB 110709B: Enhanced Swift-XRT position
  19. GRB 110709B: GROND Detection of an Afterglow Candidate
  20. GRB 110709B: Gemini-South optical observations
  21. GRB 110709A: Enhanced Swift-XRT position
  22. GRB 110709B: Swift detection of a burst
  23. GRB 110708A: Swift/UVOT Observations
  24. GRB 110709A: Swift detection of a burst
  25. GRB 110708A: Swift/XRT afterglow candidate for the INTEGRAL burst
  26. IPN triangulation of short hard GRB 110705A
  27. Swift trigger 456780 is not a burst
  28. GRB 110705A: Fermi GBM detection
  29. Swift Trigger 456659 is probably not astrophysical
  30. Swift-BAT trigger 456532 is not astrophysical
  31. SGR 1E 1841-045: early optical limit by "Pi of the Sky"
  32. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  33. Swift J185003.2-005627: 1.23m CAHA and BOOTES-3 observations
  34. GRB 110625A: Fermi GBM and LAT observations
  35. GRB 110625A: Swift/UVOT Upper Limits
  36. GRB 110625A: 1.23m CAHA I-band observations
  37. GRB 110625A: Fermi LAT detection
  38. GRB 110625A: GROND detection of a source inside the XRT error circle
  39. GRB 110625A: Konkoly observations
  40. GRB 110625A: Swift-XRT refined Analysis
  41. Swift J185003.2-005627: NIR Observation
  42. GRB 110625A: Swift detection of a burst
  43. Swift J185003.2-005627: Swift-XRT/UVOT refined analysis
  44. Swift J185003.2-005627: Swift-BAT refined analysis
  45. Swift J185003.2-005627: TAROT La Silla observatory optical observations
  46. Swift J185003.2-005627: TAROT Calern observatory optical observations
  47. Swift J185003.2-005627: Swift detection of a burst from a new Galactic transient
  48. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  49. Konus-Wind observation of GRB 110618A
  50. IPN triangulation of GRB110618A (long duration, extremely intense)
  51. GRB 110610A: 1.23m CAHA optical observations
  52. GRB 110610A: Swift/UVOT Upper Limits
  53. GRB 110610A: Enhanced Swift-XRT position
  54. Swift detection of the X-ray afterglow of GRB 110604A
  55. GRB 110610A: Swift detection of a burst
  56. GRB 110604A Detection by IPN Spacecraft and Swift-BAT
  57. GMRT detection of GRB 110328A
  58. GRB 110530A: Swift/UVOT Detection of a Fading Afterglow
  59. GRB 110530A: Enhanced Swift-XRT position
  60. GRB 110530A: NOT optical observations
  61. GRB110530A: MITSuME Okayama Optical Observation
  62. GRB 110530A: Swift detection of a burst with an optical afterglow
  63. LAT Observations of GRB110529A
  64. EVLA afterglow limits on the high z GRB090429B
  65. Swift J1644+57/GRB 110328A, Additional HST Observations
  66. GRB 110521A: MASTER prompt optical limit
  67. GRB 110521A: Swift/UVOT Upper Limits
  68. GRB 110520A: NOT optical follow-ups
  69. GRB 110521A - NOT optical observation
  70. GRB 110521A: Enhanced Swift-XRT position
  71. GRB 110521A: MASTER synchronous and early optical observations limit
  72. Swift/UVOT observations of GRB110520A
  73. GRB 110521A: Swift detection of a burst
  74. GRB 110520A: Swift-BAT refined analysis
  75. GRB 110520A: IAC80 I-band observations
  76. GRB 110520A: Enhanced Swift-XRT position
  77. GRB 110520A: WHT IR observations
  78. GRB 110520A - NOT optical observation
  79. GRB 110520A: TAROT Calern observatory optical observations
  80. GRB 110520A: Swift detection of a burst
  81. IPN localization of bright GRB 110518A
  82. GRB 110519A, Swift-BAT refined analysis
  83. GRB 110503A optical observation
  84. GRB 110503A: TAROT Calern observatory optical observations
  85. Konus-Wind observation of GRB 110503A
  86. GRB 110503A: optical observation in CrAO
  87. GRB 110503A: Centimeter observation from EVLA
  88. GRB 110503A: Millimeter observation from SMA
  89. GRB 110503A: SARA-N Observations and Photometric Calibration
  90. GRB 110503A: Swift/UVOT Observations
  91. GRB 110503A: PAIRITEL NIR Detection
  92. GRB 110503A: Swift-BAT refined analysis
  93. GRB 110503A: Enhanced Swift-XRT position
  94. GRB 110503A: Swift detection of a burst with a bright optical counterpart
  95. GRB 110426A: Swift/XRT non-detection
  96. GRB 110428A : X-ray afterglow confirmation
  97. GRB 110428A: Suzaku WAM observation of the prompt emission
  98. GRB 110422A: optical observations in CrAO
  99. GRB 110428A : Swift-XRT observations
  100. GRB 110426A: MASTER synchronous with MAXI/GSC observations

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