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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

5050 results found.

  1. GRB 060712: XRT refined analysis
  2. GRB 060708: Swift-XRT refined analysis
  3. GCN 060707: Swift-UVOT observations
  4. GRB 060707: Swift-XRT refined analysis
  5. GRB 060607B: Swift detection of a burst
  6. GRB 060607: Swift-XRT Team refined analysis
  7. GRB 060522: PROMPT Optical Limits
  8. GRB 060605: Swift-XRT Team refined analysis
  9. GRB 060604: Swift-XRT Team refined analysis
  10. GRB 060522: Swift/XRT Team refined analysis
  11. GRB 060515: Swift/XRT Team refined analysis
  12. GRB060512: Swift XRT Team refined analysis
  13. Konus-Wind observation of GRB 060510A
  14. GRB 060510B: Swift detection of a burst
  15. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  16. GRB 060501: P60 Observations and Candidate Retraction
  17. GRB 060502B: MASTER optical observations
  18. GRB 060502B: Swift detection of a short burst
  19. GRB060502: Super-LOTIS Observations
  20. GRB 060428B: MDM Observations
  21. GRB060428B, optical observation
  22. GRB 060424: Swift detection of a burst
  23. GRB060421: Swift/UVOT observations
  24. GRB 060421: Swift-XRT refined analysis
  25. GRB 060413: XRT refined analysis
  26. GRB 060413: Swift detection of a burst
  27. GRB060323: NOT optical observations
  28. GRB 060322: Swift XRT afterglow candidate
  29. GRB 060322: Swift-BAT detection of a 200-sec burst
  30. GRB 060313: Swift-XRT team refined analysis
  31. GRB 060313: Swift-BAT detection of a bright short hard burst
  32. GRB 060312: Swift XRT team refined analysis
  33. GRB 060306: SOAR Ks Observations
  34. GRB 060306: Swift-XRT team refined analysis
  35. GRB 060306: Swift detection of a bright burst
  36. GRB060218: R-band CCD photmetry
  37. GRB060223b: optical limit
  38. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  39. GRB 060223B: Swift XRT possible afterglow
  40. GRB 060218/SN 2006aj: ABT observations
  41. GRB 060223B: Swift detection of a bright burst
  42. GRB 060219: Swift-XRT Team refined analysis
  43. GRB 060211a: WIRO NIR Observations
  44. GRB 060211B: Swift-XRT Team refined analysis
  45. GRB 060211A: Swift XRT Team Refined Analysis
  46. GRB060210: Swift XRT Refined Analysis
  47. GRB060204B: Swift/UVOT refined analysis
  48. GRB 060204B: Swift detection of a burst
  49. GRB 060202: Swift XRT Team Refined Analysis
  50. GRB060124: optical observation
  51. GRB060124: optical observations
  52. GRB060124: optical observation
  53. GRB 060116 HST observations
  54. GRB 060124: HETE detection and spectrum of the main peak
  55. GRB060124, optical observation
  56. GRB060124:MASTER optical observation
  57. GRB 060124: Swift-BAT detection of a burst
  58. GRB 060121: Swift XRT refined analysis
  59. GRB060121: SARA Observations
  60. GRB 060121: A bright short/hard GRB localized by HETE-2 SXC
  61. GRB 060121: A bright short/hard GRB localized by HETE-2 WXM
  62. GRB 060116: PROMPT Observations
  63. GRB 060115: PROMPT Observations
  64. GRB 060110: KAIT observations
  65. GRB 060111: TAROT optical observation
  66. GRB 060111: possible UVOT counterpart
  67. GRB060111 : XRT refined analysis
  68. GRB 060111: Swift detection of a burst
  69. Correction to GRB 060109 XRT analysis
  70. GRB 060108: Refined XRT analysis
  71. GRB 051221A: VLA Radio Observations
  72. GRB 051221: Continued fading of optical afterglow
  73. GRB 051221: Swift XRT refined analysis
  74. Refined analysis of the SWIFT J1626.6-5156
  75. Swift-BAT discovery of hard x-ray transient SWIFT J1626.6-5156
  76. Swift detection of an RS CVn flare star
  77. GRB 051117B: ROTSE-III Optical Limits
  78. GRB 051109A
  79. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  80. GRB051109A: XRT refined analysis
  81. GRB 051105b: ART optical limits
  82. GRB051028: Swift/UVOT upper limits
  83. GRB051021a: optical observations
  84. GRB051021b: Magellan IR Imaging
  85. GRB 051021: P200 Ks Observations
  86. GRB051021B: Swift XRT Position
  87. GRB 051016B: Swift detection of a soft burst
  88. GRB050805A: Rc optical observations
  89. GRB 051001: Swift XRT refined analysis
  90. GRB 050922C: further VLT observations
  91. GRB 050925: WSRT Radio Observations
  92. GRB050922B: refined XRT analysis
  93. GRB050922C: Optical Observations
  94. GRB050918: Possible Swift/XRT detected afterglow
  95. GRB 050916: Swift-BAT refined analysis
  96. GRB 050915b, SMARTS optical/IR observations of the XRT position
  97. GRB 050915B: Swift-BAT refined analysis
  98. GRB 050915B: XRT position
  99. GRB050915B: Swift-BAT detection of a long bright burst
  100. GRB 050915: Swift XRT refined analysis

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