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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"

20501 results found.

  1. GRB 070412, Swift-BAT refined analysis
  2. GRB 070412 Liverpool Telescope optical limit
  3. GRB 070412: Swift-XRT refined analysis
  4. GRB 070411: Swift-XRT refined analysis
  5. GRB 070412: Optical observations at Crni Vrh
  6. GRB 070412: Swift-XRT refined position
  7. GRB 070412: further NOT observations
  8. GRB 070412: Gemini/GMOS afterglow candidate
  9. GRB 070412: IAC80 optical afterglow candidate
  10. GRB 070412: NOT observations
  11. GRB 070412: Swift detection of a burst
  12. GRB 070411: IAC80 optical observations
  13. GRB 070411 : Liverpool Telescope Observations
  14. GRB 070411: Swift detection of a burst with optical afterglow
  15. GRB 070406: Swift XRT team further analysis
  16. Suzaku ToO observation of SGR 1806-20
  17. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  18. GRB 070406: Correction to the optical candidate in GCN6253
  19. GRB 070406: Gemini South Imaging and XRT analysis
  20. GRB070406: Swift UVOT observations
  21. GRB 070406: NOT observations
  22. GRB 070406: SARA upper limit
  23. GRB 070406: Xinglong TNT optical Upper Limit
  24. INTEGRAL ToO Observation of SGR1806-20
  25. UVOT observations of GRB070330
  26. GRB 070330: TAROT La Silla observatory optical observations
  27. GRB 070330 - Watcher Observations
  28. GRB 070328: Swift/UVOT Upper Limits
  29. long burst from SGR 1806-20 detected on March 26
  30. GRB 070328 : Suzaku ToO follow up starts
  31. GRB 070328, Swift-BAT refined analysis
  32. GRB 070328: Swift detection of a burst
  33. GRB 070311, deep optical photometry
  34. Short-Hard GRB 070209: PROMPT Observations
  35. GRB 070318: absorption-line redshift
  36. GRB070318: Swift UVOT continuing observations
  37. GRB 070318: Swift detection of a burst with an optical afterglow
  38. VLA observation of GRB 070311
  39. GRB 070311: Optical observation.
  40. GRB 070306: possible emission-line redshift
  41. GRB 070311: SARA upper limit
  42. GRB070311: FRAM early follow-up limit
  43. GRB 070311: P60 Observations
  44. GRB 070311: Swift/UVOT Upper Limits
  45. GRB 070311: MITSuME Okayama Optical Observation
  46. GRB 070311: PAIRITEL confirmation of variability of REM candidate
  47. GRB 070311: REM candidate afterglow
  48. GRB060901: Candidate optical afterglow
  49. GRB 070125: Chandra X-ray Confirmation of Jet Break
  50. GRB 070309: Swift/UVOT Upper Limits
  51. GRB 070306, optical observation
  52. Swift UVOT Finding Charts for GRB 070309
  53. GRB 070125: X-ray light curve analysis
  54. VLA observation of GRB 070306
  55. GRB 070306: NOT observations
  56. GRB 070306 Swift/UVOT refined analysis
  57. GRB 070306: IR observations and candidate afterglow
  58. GRB 070306: Optical and IR observations with KANATA
  59. GRB070306 - SDSS Pre-burst Observations
  60. GRB 070306: Swift detection of a burst
  61. GRB070227: Swift-XRT refined analysis
  62. GRB 060605 new redshift
  63. GRB 070125, deep late-time optical observation
  64. VLA observation of GRB 070224
  65. GRB 070227: Swift/UVOT Upper Limits
  66. GRB 070227: TAROT La Silla observatory optical observations
  67. GRB 070227: Swift detection of a burst in ground analysis
  68. GRB 070224: Swift/UVOT Upper Limits
  69. VLA observation of GRB 070223
  70. VLA observation of GRB 070220
  71. GRB070224: Magellan Imaging Observations
  72. GRB 070224: WHT K-band imaging
  73. GRB 070224: MDM Observations
  74. GRB070224: Gemini Imaging Observations
  75. GRB 070224: SARA upper limit
  76. GRB 070224: optical afterglow candidate
  77. GRB 070224: MASTER-Net refind analysis
  78. GRB 070224: MASTER-VWF-Kislovodsk observations
  79. GRB 070224: Swift detection of a burst
  80. GRB 070223: Optical observations
  81. GRB070223: Swift/UVOT refined analysis
  82. GRB 070223: Optical-IR observation with KANATA
  83. GRB070223: MASTER-VWF-Kislovodsk observations
  84. GRB070223 - SDSS Pre-Burst Observations
  85. GRB070223: Swift burst
  86. GRB 070220: MITSuME Okayama Optical Observation
  87. Swift/UVOT refined analysis of GRB070220
  88. GRB 070209: Swift XRT refined analysis
  89. GRB 070220: Observation with the KANATA 1.5m telescope
  90. GRB 070219: Gemini Observations
  91. GRB 070220: Swift detection of a burst
  92. GRB070219: MASTER-VWF-Kislovodsk observations
  93. GRB 070219: XRT Refined Analysis
  94. GRB 070219: Swift/UVOT Upper limits
  95. GRB 070219: I-band observations
  96. GRB 070219, Swift-BAT refined analysis
  97. GRB 070219: optical TNG observations
  98. GRB070219 - SDSS Pre-Burst Observations
  99. GRB 070125 observations with the GMRT
  100. GRB 070129: MDM I-band Detection

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