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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"

26318 results found.

  1. GRB 070419A, Optical observations
  2. GRB070419 - SDSS Pre-Burst Observations
  3. GRB 070419A: SARA observations
  4. GRB 070419A: NAYUTA Optical Observation
  5. GRB 070419B optical afterglow candidate
  6. GRB 070419A: Optical and IR observations with KANATA
  7. GRB 070419B: optical afterglow candidate
  8. GRB070419A, optical observation
  9. Infrared detection of GRB070419A with UKIRT
  10. GRB 070419A: Kiso Optical observation
  11. GRB 070419: P60 Confirmation of Optical Afterglow
  12. GRB 070419B: Swift detection of a burst
  13. GRB 070419A: ROTSE-III Optical Limits
  14. GRB 070419: Swift detection of a burst
  15. GRB 070418: Optical and IR observations with KANATA
  16. Trigger 276045: Swift detection of a possible burst
  17. GRB 070406: Swift XRT refined analysis
  18. GRB070412: UKIRT-WFCAM JHK upper limits
  19. GRB070412: Swift UVOT observations
  20. GRB 070411: Swift/UVOT observations
  21. GRB 070412, Swift-BAT refined analysis
  22. GRB 070412 Liverpool Telescope optical limit
  23. GRB 070412: Optical observations at Crni Vrh
  24. GRB 070412: further NOT observations
  25. GRB 070412: Gemini/GMOS afterglow candidate
  26. GRB 070412: IAC80 optical afterglow candidate
  27. GRB 070412: NOT observations
  28. GRB 070411, Swift-BAT refined analysis
  29. GRB 070412: Swift detection of a burst
  30. GRB 070411: IAC80 optical observations
  31. GRB 070411 : Liverpool Telescope Observations
  32. GRB 070411: Swift detection of a burst with optical afterglow
  33. GRB 070406: Swift XRT team further analysis
  34. Suzaku ToO observation of SGR 1806-20
  35. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  36. GRB 070406, Swift-BAT refined analysis
  37. GRB 070406: Correction to the optical candidate in GCN6253
  38. GRB 070406: Gemini South Imaging and XRT analysis
  39. GRB070406: Swift UVOT observations
  40. GRB 070406: further analysis of NOT images.
  41. Short GRB 070406 - Possible Bright Host Galaxy
  42. GRB 070406: NOT observations
  43. GRB 070406: Optical candidate
  44. GRB 070406: SARA upper limit
  45. GRB 070406: Xinglong TNT optical Upper Limit
  46. GRB 070402: Suzaku WAM observation of the prompt emission
  47. GRB 070328: Suzaku WAM observation of the prompt emission
  48. UVOT observations of GRB070330
  49. GRB 070330, Swift-BAT refined analysis
  50. GRB 070330: TAROT La Silla observatory optical observations
  51. GRB 070330 - Watcher Observations
  52. GRB 070330: Swift detection of a burst
  53. GRB 070328: Swift/UVOT Upper Limits
  54. long burst from SGR 1806-20 detected on March 26
  55. GRB 070328: Swift/XRT Refined Analysis
  56. GRB 070328 : Suzaku ToO follow up starts
  57. GRB 070328, Swift-BAT refined analysis
  58. GRB 070328: Swift detection of a burst
  59. GRB 070311, deep optical photometry
  60. Short-Hard GRB 070209: PROMPT Observations
  61. GRB 070318: absorption-line redshift
  62. GRB070318: Swift UVOT continuing observations
  63. GRB 070318, Swift-BAT refined analysis
  64. GRB 070318: Swift detection of a burst with an optical afterglow
  65. GRB 070311: Late Central Engine Activity Optical Flare??
  66. VLA observation of GRB 070311
  67. GRB 070311: Optical observation.
  68. GRB 070306: possible emission-line redshift
  69. GRB 070311: SARA upper limit
  70. GRB 070309: variability of the XRT afterglow candidate
  71. GRB070311: FRAM early follow-up limit
  72. GRB 070311: P60 Observations
  73. GRB 070311: Swift/UVOT Upper Limits
  74. GRB 070311: MITSuME Okayama Optical Observation
  75. GRB 070311: Swift-XRT refined analysis
  76. GRB 070311: PAIRITEL confirmation of variability of REM candidate
  77. GRB 070311: REM candidate afterglow
  78. GRB 070311: a long GRB detected by INTEGRAL
  79. GRB060901: Candidate optical afterglow
  80. GRB 070125: Chandra X-ray Confirmation of Jet Break
  81. GRB 070309: Swift/UVOT Upper Limits
  82. GRB 070306, optical observation
  83. Swift UVOT Finding Charts for GRB 070309
  84. GRB 070309: A long GRB detected by INTEGRAL
  85. GRB 070125: X-ray light curve analysis
  86. VLA observation of GRB 070306
  87. GRB 070306: NOT observations
  88. GRB 070306 Swift/UVOT refined analysis
  89. GRB 070306: IR observations and candidate afterglow
  90. GRB 070306, Swift-BAT refined analysis
  91. GRB 070306: XRT Team Refined Analysis
  92. GRB 070306: Optical and IR observations with KANATA
  93. GRB070306 - SDSS Pre-burst Observations
  94. GRB 070306: Swift detection of a burst
  95. GRB070227: Swift-XRT refined analysis
  96. GRB 060605 new redshift
  97. GRB 070125, deep late-time optical observation
  98. VLA observation of GRB 070224
  99. GRB 070227: Swift/UVOT Upper Limits
  100. GRB 070227: TAROT La Silla observatory optical observations

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