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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"

19684 results found.

  1. GRB 110719A: optical limit by "Pi of the Sky"
  2. GRB 110719A: z-band upper limit
  3. Swift/UVOT observations of GRB110719A
  4. Swift J1822.3-1606 : Fermi GBM observation
  5. GRB 110719A: optical upper limit
  6. GRB 110719A: Enhanced Swift-XRT position
  7. GRB 110715A optical observations
  8. GRB 110719A: Swift detection of a burst
  9. GRB110715A: GROND Detection of the Optical/NIR Afterglow
  10. GRB 110715A: APEX detection of the submm counterpart
  11. GRB 110715A: Swift/UVOT Detection
  12. GRB 110715A: Enhanced Swift-XRT position
  13. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  14. GRB 110715A: Swift detection of a bright burst with an optical counterpart
  15. GRB 110709B: Swift/UVOT Observations
  16. GRB 110709B: Additional Gemini observations and deep limits on an optical afterglow
  17. Swift trigger 457076 is not a GRB
  18. GRB 110709B: Submm observations from APEX
  19. IPN triangulation of GRB 110708B (long duration, extremely intense)
  20. Swift Trigger 457076: a possible GRB
  21. GRB 110709A: Swift/UVOT Upper Limits
  22. GRB 110709A: Konkoly observations
  23. GRB 110708A: Konkoly observations
  24. GRB 110709B BAT refined analysis
  25. GRB 110709B: Swift/UVOT Detection of Possible Optical Flaring
  26. GRB110709A: MITSuME Ishigakijima Optical upper limits
  27. GRB 110709B: Enhanced Swift-XRT position
  28. GRB 110709B: GROND Detection of an Afterglow Candidate
  29. GRB 110709B: Gemini-South optical observations
  30. GRB 110709A: Swift-BAT refined analysis
  31. GRB 110709A: Enhanced Swift-XRT position
  32. GRB 110709B: Swift detection of a burst
  33. GRB 110708A: Swift/UVOT Observations
  34. GRB 110709A: Swift detection of a burst
  35. GRB 110708A: Swift/XRT afterglow candidate for the INTEGRAL burst
  36. GRB 110708A: a long GRB detected by INTEGRAL
  37. IPN triangulation of short hard GRB 110705A
  38. Swift trigger 456780 is not a burst
  39. Swift Trigger 456659 is probably not astrophysical
  40. Swift-BAT trigger 456532 is not astrophysical
  41. SGR 1E 1841-045: early optical limit by "Pi of the Sky"
  42. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  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. Konus-Wind observation of GRB 110625A
  51. GRB 110625A: Swift-XRT 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: TAROT La Silla observatory optical observations
  56. Swift J185003.2-005627: TAROT Calern observatory optical observations
  57. Swift J185003.2-005627: Swift detection of a burst from a new Galactic transient
  58. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  59. IPN triangulation of GRB110618A (long duration, extremely intense)
  60. GRB 110610A: 1.23m CAHA optical observations
  61. GRB 110610A: Swift-XRT refined Analysis
  62. GRB 110610A: Swift/UVOT Upper Limits
  63. GRB 110610A: Enhanced Swift-XRT position
  64. Swift detection of the X-ray afterglow of GRB 110604A
  65. GRB 110610A: Swift detection of a burst
  66. Konus-Wind observation of GRB 110604A
  67. GRB 110604A Detection by IPN Spacecraft and Swift-BAT
  68. GMRT detection of GRB 110328A
  69. GRB 110530A: Swift/UVOT Detection of a Fading Afterglow
  70. GRB 110530A: Enhanced Swift-XRT position
  71. GRB 110530A: NOT optical observations
  72. GRB110530A: MITSuME Okayama Optical Observation
  73. GRB 110530A: Swift detection of a burst with an optical afterglow
  74. LAT Observations of GRB110529A
  75. EVLA afterglow limits on the high z GRB090429B
  76. Swift J1644+57/GRB 110328A, Additional HST Observations
  77. GRB 110521A: MASTER prompt optical limit
  78. GRB 110521A: Swift/UVOT Upper Limits
  79. GRB 110521A: Swift-XRT refined analysis
  80. GRB 110520A: NOT optical follow-ups
  81. GRB 110521A - NOT optical observation
  82. GRB 110521A: Swift-BAT refined analysis
  83. GRB 110521A: Enhanced Swift-XRT position
  84. GRB 110521A: MASTER synchronous and early optical observations limit
  85. Swift/UVOT observations of GRB110520A
  86. GRB 110521A: Swift detection of a burst
  87. GRB 110520A: IAC80 I-band observations
  88. GRB 110520A: Enhanced Swift-XRT position
  89. GRB 110520A: WHT IR observations
  90. GRB 110520A - NOT optical observation
  91. GRB 110520A: TAROT Calern observatory optical observations
  92. GRB 110520A: Swift detection of a burst
  93. Konus-Wind observation of GRB 110518A
  94. IPN localization of bright GRB 110518A
  95. GRB 110519A, Swift-BAT refined analysis
  96. GRB 110503A: TAROT Calern observatory optical observations
  97. GRB 110503A: optical observation in CrAO
  98. GRB 110503A: Centimeter observation from EVLA
  99. GRB 110503A: Millimeter observation from SMA
  100. GRB 110503A: SARA-N Observations and Photometric Calibration

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