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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"

19090 results found.

  1. GRB070406: Swift UVOT observations
  2. GRB 070406: NOT observations
  3. GRB 070406: SARA upper limit
  4. GRB 070406: Xinglong TNT optical Upper Limit
  5. GRB 070328: Suzaku WAM observation of the prompt emission
  6. UVOT observations of GRB070330
  7. GRB 070330: TAROT La Silla observatory optical observations
  8. GRB 070330 - Watcher Observations
  9. GRB 070330: Swift detection of a burst
  10. GRB 070328: Swift/UVOT Upper Limits
  11. long burst from SGR 1806-20 detected on March 26
  12. GRB 070328 : Suzaku ToO follow up starts
  13. GRB 070328: Swift detection of a burst
  14. GRB070220: optical observations
  15. GRB070208: optical observations
  16. GRB 070311, deep optical photometry
  17. Short-Hard GRB 070209: PROMPT Observations
  18. GRB 070318: absorption-line redshift
  19. GRB070318: Swift UVOT continuing observations
  20. GRB 070318: Swift detection of a burst with an optical afterglow
  21. VLA observation of GRB 070311
  22. GRB 070311: Optical observation.
  23. GRB 070306: possible emission-line redshift
  24. GRB 070311: SARA upper limit
  25. GRB070311: FRAM early follow-up limit
  26. GRB 070311: P60 Observations
  27. GRB 070311: Swift/UVOT Upper Limits
  28. GRB 070311: MITSuME Okayama Optical Observation
  29. GRB 070311: PAIRITEL confirmation of variability of REM candidate
  30. GRB 070311: REM candidate afterglow
  31. GRB060901: Candidate optical afterglow
  32. GRB 070125: Chandra X-ray Confirmation of Jet Break
  33. GRB 070309: Swift/UVOT Upper Limits
  34. GRB 070306, optical observation
  35. Swift UVOT Finding Charts for GRB 070309
  36. VLA observation of GRB 070306
  37. GRB 070306: NOT observations
  38. GRB 070306 Swift/UVOT refined analysis
  39. GRB 070306: IR observations and candidate afterglow
  40. GRB 070306: Optical and IR observations with KANATA
  41. GRB070306 - SDSS Pre-burst Observations
  42. GRB 070306: Swift detection of a burst
  43. GRB 060605 new redshift
  44. GRB 070125, deep late-time optical observation
  45. VLA observation of GRB 070224
  46. GRB 070227: Swift/UVOT Upper Limits
  47. GRB 070227: TAROT La Silla observatory optical observations
  48. GRB 070227, Swift-BAT refined analysis
  49. GRB070227: possible X-ray afterglow detection
  50. GRB 070227: Swift detection of a burst in ground analysis
  51. GRB 070224: Swift/UVOT Upper Limits
  52. VLA observation of GRB 070223
  53. VLA observation of GRB 070220
  54. GRB070224: Magellan Imaging Observations
  55. GRB 070224: WHT K-band imaging
  56. GRB 070224: MDM Observations
  57. GRB070224: Gemini Imaging Observations
  58. GRB 070224: SARA upper limit
  59. GRB 070224: optical afterglow candidate
  60. GRB 070224: MASTER-Net refind analysis
  61. GRB 070224: MASTER-VWF-Kislovodsk observations
  62. GRB 070224: Swift detection of a burst
  63. GRB 070223: Optical observations
  64. GRB070223: Swift/UVOT refined analysis
  65. GRB 070223: Optical-IR observation with KANATA
  66. GRB070223: MASTER-VWF-Kislovodsk observations
  67. GRB070223 - SDSS Pre-Burst Observations
  68. GRB070223: Swift burst
  69. GRB 070220: MITSuME Okayama Optical Observation
  70. Swift/UVOT refined analysis of GRB070220
  71. GRB 070209: Swift XRT refined analysis
  72. GRB 070220: Observation with the KANATA 1.5m telescope
  73. GRB 070219: Gemini Observations
  74. GRB 070220: Swift detection of a burst
  75. GRB070219: MASTER-VWF-Kislovodsk observations
  76. GRB 070219: Swift/UVOT Upper limits
  77. GRB 070219: I-band observations
  78. GRB 070219: optical TNG observations
  79. GRB070219 - SDSS Pre-Burst Observations
  80. GRB 070125 observations with the GMRT
  81. GRB 070129: MDM I-band Detection
  82. GRB 070201: IPN constraints and nearby galaxies
  83. GRB 070208: MARGE Optical Observations
  84. GRB 070209, Swift-BAT refined analysis of the short hard burst
  85. GRB 070209: Swift detection of a short hard burst
  86. GRB070208: Absorption and emission redshift from Gemini
  87. GRB 070208: MDM Optical Decay
  88. GRB070208 - SDSS Pre-Burst Observations
  89. GRB 070208: MDM Observations
  90. GRB 070208: Swift detection of a burst
  91. GRB 070125 detection with CARMA
  92. GRB 070129: afterglow confirmation
  93. GRB070126: Swift-XRT Observation
  94. GRB 070129: Swift/UVOT Upper limits
  95. GRB 070129: Xinglong TNT optical Upper Limit
  96. GRB 070129: Swift-XRT Refined Analysis
  97. GRB 070129: VLT observations
  98. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  99. GRB 070129: Swift detection of a burst
  100. GRB 070126: Swift/UVOT refined analysis

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