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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"

5157 results found.

  1. GRB 060805: XRT Team Refined Analysis
  2. GRB 060804: Swift-XRT Team Refined Analysis
  3. GRB 060801: WSRT Radio Observations
  4. GRB060801: optical upper limit in R
  5. GRB 060728: Swift detection of a burst
  6. GRB060614 ATCA Radio Limits
  7. GRB 060218 (SN 2006aj): IR afterglow detection six months after the
  8. GRB 060712: XRT refined analysis
  9. GRB 060708: Swift-XRT refined analysis
  10. GCN 060707: Swift-UVOT observations
  11. GRB 060707: Swift-XRT refined analysis
  12. GRB 060607B: Swift detection of a burst
  13. GRB 060607: Swift-XRT Team refined analysis
  14. GRB 060522: PROMPT Optical Limits
  15. GRB 060605: Swift-XRT Team refined analysis
  16. GRB 060604: Swift-XRT Team refined analysis
  17. GRB 060522: Swift/XRT Team refined analysis
  18. GRB 060515: Swift/XRT Team refined analysis
  19. GRB060512: Swift XRT Team refined analysis
  20. Konus-Wind observation of GRB 060510A
  21. GRB 060510B: Swift detection of a burst
  22. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  23. GRB 060501: P60 Observations and Candidate Retraction
  24. GRB 060502B: MASTER optical observations
  25. GRB 060502B: Swift detection of a short burst
  26. GRB060502: Super-LOTIS Observations
  27. GRB 060428B: MDM Observations
  28. GRB060428B, optical observation
  29. GRB 060424: Swift detection of a burst
  30. GRB060421: Swift/UVOT observations
  31. GRB 060421: Swift-XRT refined analysis
  32. GRB 060413: XRT refined analysis
  33. GRB 060413: Swift detection of a burst
  34. GRB060323: NOT optical observations
  35. GRB 060322: Swift XRT afterglow candidate
  36. GRB 060322: Swift-BAT detection of a 200-sec burst
  37. GRB 060313: Swift-XRT team refined analysis
  38. GRB 060313: Swift-BAT detection of a bright short hard burst
  39. GRB 060312: Swift XRT team refined analysis
  40. GRB 060306: SOAR Ks Observations
  41. GRB 060306: Swift-XRT team refined analysis
  42. GRB 060306: Swift detection of a bright burst
  43. GRB060218: R-band CCD photmetry
  44. GRB060223b: optical limit
  45. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  46. GRB 060223B: Swift XRT possible afterglow
  47. GRB 060218/SN 2006aj: ABT observations
  48. GRB 060223B: Swift detection of a bright burst
  49. GRB 060219: Swift-XRT Team refined analysis
  50. GRB 060211a: WIRO NIR Observations
  51. GRB 060211B: Swift-XRT Team refined analysis
  52. GRB 060211A: Swift XRT Team Refined Analysis
  53. GRB060210: Swift XRT Refined Analysis
  54. GRB060204B: Swift/UVOT refined analysis
  55. GRB 060204B: Swift detection of a burst
  56. GRB 060202: Swift XRT Team Refined Analysis
  57. GRB060124: optical observation
  58. GRB060124: optical observations
  59. GRB060124: optical observation
  60. GRB 060116 HST observations
  61. GRB 060124: HETE detection and spectrum of the main peak
  62. GRB060124, optical observation
  63. GRB060124:MASTER optical observation
  64. GRB 060124: Swift-BAT detection of a burst
  65. GRB 060121: Swift XRT refined analysis
  66. GRB060121: SARA Observations
  67. GRB 060121: A bright short/hard GRB localized by HETE-2 SXC
  68. GRB 060121: A bright short/hard GRB localized by HETE-2 WXM
  69. GRB 060116: PROMPT Observations
  70. GRB 060115: PROMPT Observations
  71. GRB 060110: KAIT observations
  72. GRB 060111: TAROT optical observation
  73. GRB 060111: possible UVOT counterpart
  74. GRB060111 : XRT refined analysis
  75. GRB 060111: Swift detection of a burst
  76. Correction to GRB 060109 XRT analysis
  77. GRB 060108: Refined XRT analysis
  78. GRB 051221A: VLA Radio Observations
  79. GRB 051221: Continued fading of optical afterglow
  80. GRB 051221: Swift XRT refined analysis
  81. Refined analysis of the SWIFT J1626.6-5156
  82. Swift-BAT discovery of hard x-ray transient SWIFT J1626.6-5156
  83. Swift detection of an RS CVn flare star
  84. GRB 051117B: ROTSE-III Optical Limits
  85. GRB 051109A
  86. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  87. GRB051109A: XRT refined analysis
  88. GRB 051105b: ART optical limits
  89. GRB051028: Swift/UVOT upper limits
  90. GRB051021a: optical observations
  91. GRB051021b: Magellan IR Imaging
  92. GRB 051021: P200 Ks Observations
  93. GRB051021B: Swift XRT Position
  94. GRB 051016B: Swift detection of a soft burst
  95. GRB050805A: Rc optical observations
  96. GRB 051001: Swift XRT refined analysis
  97. GRB 050922C: further VLT observations
  98. GRB 050925: WSRT Radio Observations
  99. GRB050922B: refined XRT analysis
  100. GRB050922C: Optical Observations

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