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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"

20408 results found.

  1. GRB 070419: Swift detection of a burst
  2. GRB 070418: Optical and IR observations with KANATA
  3. Trigger 276045: Swift detection of a possible burst
  4. GRB 070406: Swift XRT refined analysis
  5. GRB070412: UKIRT-WFCAM JHK upper limits
  6. GRB070412: Swift UVOT observations
  7. GRB 070411: Swift/UVOT observations
  8. GRB 070412, Swift-BAT refined analysis
  9. GRB 070412 Liverpool Telescope optical limit
  10. GRB 070412: Swift-XRT refined analysis
  11. GRB 070411: Swift-XRT refined analysis
  12. GRB 070412: Optical observations at Crni Vrh
  13. GRB 070412: Swift-XRT refined position
  14. GRB 070412: further NOT observations
  15. GRB 070412: Gemini/GMOS afterglow candidate
  16. GRB 070412: IAC80 optical afterglow candidate
  17. GRB 070412: NOT observations
  18. GRB 070412: Swift detection of a burst
  19. GRB 070411: IAC80 optical observations
  20. GRB 070411 : Liverpool Telescope Observations
  21. GRB 070411: Swift detection of a burst with optical afterglow
  22. GRB 070406: Swift XRT team further analysis
  23. Suzaku ToO observation of SGR 1806-20
  24. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  25. GRB 070406: Correction to the optical candidate in GCN6253
  26. GRB 070406: Gemini South Imaging and XRT analysis
  27. GRB070406: Swift UVOT observations
  28. GRB 070406: NOT observations
  29. GRB 070406: SARA upper limit
  30. GRB 070406: Xinglong TNT optical Upper Limit
  31. INTEGRAL ToO Observation of SGR1806-20
  32. UVOT observations of GRB070330
  33. GRB 070330: TAROT La Silla observatory optical observations
  34. GRB 070330 - Watcher Observations
  35. GRB 070328: Swift/UVOT Upper Limits
  36. long burst from SGR 1806-20 detected on March 26
  37. GRB 070328 : Suzaku ToO follow up starts
  38. GRB 070328, Swift-BAT refined analysis
  39. GRB 070328: Swift detection of a burst
  40. GRB 070311, deep optical photometry
  41. Short-Hard GRB 070209: PROMPT Observations
  42. GRB 070318: absorption-line redshift
  43. GRB070318: Swift UVOT continuing observations
  44. GRB 070318: Swift detection of a burst with an optical afterglow
  45. VLA observation of GRB 070311
  46. GRB 070311: Optical observation.
  47. GRB 070306: possible emission-line redshift
  48. GRB 070311: SARA upper limit
  49. GRB070311: FRAM early follow-up limit
  50. GRB 070311: P60 Observations
  51. GRB 070311: Swift/UVOT Upper Limits
  52. GRB 070311: MITSuME Okayama Optical Observation
  53. GRB 070311: PAIRITEL confirmation of variability of REM candidate
  54. GRB 070311: REM candidate afterglow
  55. GRB060901: Candidate optical afterglow
  56. GRB 070125: Chandra X-ray Confirmation of Jet Break
  57. GRB 070309: Swift/UVOT Upper Limits
  58. GRB 070306, optical observation
  59. Swift UVOT Finding Charts for GRB 070309
  60. GRB 070125: X-ray light curve analysis
  61. VLA observation of GRB 070306
  62. GRB 070306: NOT observations
  63. GRB 070306 Swift/UVOT refined analysis
  64. GRB 070306: IR observations and candidate afterglow
  65. GRB 070306: Optical and IR observations with KANATA
  66. GRB070306 - SDSS Pre-burst Observations
  67. GRB 070306: Swift detection of a burst
  68. GRB070227: Swift-XRT refined analysis
  69. GRB 060605 new redshift
  70. GRB 070125, deep late-time optical observation
  71. VLA observation of GRB 070224
  72. GRB 070227: Swift/UVOT Upper Limits
  73. GRB 070227: TAROT La Silla observatory optical observations
  74. GRB 070227: Swift detection of a burst in ground analysis
  75. GRB 070224: Swift/UVOT Upper Limits
  76. VLA observation of GRB 070223
  77. VLA observation of GRB 070220
  78. GRB070224: Magellan Imaging Observations
  79. GRB 070224: WHT K-band imaging
  80. GRB 070224: MDM Observations
  81. GRB070224: Gemini Imaging Observations
  82. GRB 070224: SARA upper limit
  83. GRB 070224: optical afterglow candidate
  84. GRB 070224: MASTER-Net refind analysis
  85. GRB 070224: MASTER-VWF-Kislovodsk observations
  86. GRB 070224: Swift detection of a burst
  87. GRB 070223: Optical observations
  88. GRB070223: Swift/UVOT refined analysis
  89. GRB 070223: Optical-IR observation with KANATA
  90. GRB070223: MASTER-VWF-Kislovodsk observations
  91. GRB070223 - SDSS Pre-Burst Observations
  92. GRB070223: Swift burst
  93. GRB 070220: MITSuME Okayama Optical Observation
  94. Swift/UVOT refined analysis of GRB070220
  95. GRB 070209: Swift XRT refined analysis
  96. GRB 070220: Observation with the KANATA 1.5m telescope
  97. GRB 070219: Gemini Observations
  98. GRB 070220: Swift detection of a burst
  99. GRB070219: MASTER-VWF-Kislovodsk observations
  100. GRB 070219: XRT Refined Analysis

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