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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"

18393 results found.

  1. GRB 070330 - Watcher Observations
  2. GRB 070328: Swift/UVOT Upper Limits
  3. GRB 070328 : Suzaku ToO follow up starts
  4. GRB 070328: Swift detection of a burst
  5. GRB 070311, deep optical photometry
  6. Short-Hard GRB 070209: PROMPT Observations
  7. GRB 070318: absorption-line redshift
  8. GRB070318: Swift UVOT continuing observations
  9. GRB070318: Swift-XRT refined analysis
  10. GRB 070318: Swift detection of a burst with an optical afterglow
  11. VLA observation of GRB 070311
  12. GRB 070311: Optical observation.
  13. GRB 070306: possible emission-line redshift
  14. GRB 070311: SARA upper limit
  15. GRB070311: FRAM early follow-up limit
  16. GRB 070311: P60 Observations
  17. GRB 070311: Swift/UVOT Upper Limits
  18. GRB 070311: MITSuME Okayama Optical Observation
  19. GRB 070311: PAIRITEL confirmation of variability of REM candidate
  20. GRB 070311: REM candidate afterglow
  21. GRB060901: Candidate optical afterglow
  22. GRB 070125: Chandra X-ray Confirmation of Jet Break
  23. GRB 070309: Swift/UVOT Upper Limits
  24. GRB 070306, optical observation
  25. Swift UVOT Finding Charts for GRB 070309
  26. GRB 070309: A long GRB detected by INTEGRAL
  27. VLA observation of GRB 070306
  28. GRB 070306: NOT observations
  29. GRB 070306 Swift/UVOT refined analysis
  30. GRB 070306: IR observations and candidate afterglow
  31. GRB 070306: XRT Team Refined Analysis
  32. GRB 070306: Optical and IR observations with KANATA
  33. GRB070306 - SDSS Pre-burst Observations
  34. GRB 070306: Swift detection of a burst
  35. GRB 060605 new redshift
  36. GRB 070125, deep late-time optical observation
  37. VLA observation of GRB 070224
  38. GRB 070227: Swift/UVOT Upper Limits
  39. GRB 070227: TAROT La Silla observatory optical observations
  40. GRB 070227: Swift detection of a burst in ground analysis
  41. GRB 070224: Swift/UVOT Upper Limits
  42. VLA observation of GRB 070223
  43. VLA observation of GRB 070220
  44. GRB070224: Magellan Imaging Observations
  45. GRB 070224: WHT K-band imaging
  46. GRB 070224: MDM Observations
  47. GRB070224: Gemini Imaging Observations
  48. GRB 070224: SARA upper limit
  49. GRB 070224: optical afterglow candidate
  50. GRB 070224: MASTER-Net refind analysis
  51. GRB 070224: MASTER-VWF-Kislovodsk observations
  52. GRB 070224: Swift detection of a burst
  53. GRB 070223: Optical observations
  54. GRB070223: Swift/UVOT refined analysis
  55. GRB 070223: Optical-IR observation with KANATA
  56. GRB070223: MASTER-VWF-Kislovodsk observations
  57. GRB070223 - SDSS Pre-Burst Observations
  58. GRB070223: Swift burst
  59. GRB 070220: MITSuME Okayama Optical Observation
  60. Swift/UVOT refined analysis of GRB070220
  61. GRB 070209: Swift XRT refined analysis
  62. GRB 070220: Swift-XRT Refined Analysis
  63. GRB 070220: Observation with the KANATA 1.5m telescope
  64. GRB 070219: Gemini Observations
  65. GRB 070220: Swift detection of a burst
  66. GRB070219: MASTER-VWF-Kislovodsk observations
  67. GRB 070219: Swift/UVOT Upper limits
  68. GRB 070219: I-band observations
  69. GRB 070219: optical TNG observations
  70. GRB070219 - SDSS Pre-Burst Observations
  71. GRB 070125 observations with the GMRT
  72. GRB 070129: MDM I-band Detection
  73. GRB070208 - SDSS Pre-Burst Observations
  74. GRB 070208: Swift detection of a burst
  75. GRB 070125 detection with CARMA
  76. GRB 070129: afterglow confirmation
  77. GRB070126: Swift-XRT Observation
  78. GRB 070129: Swift/UVOT Upper limits
  79. GRB070129: MITSuME optical observation
  80. GRB 070129: Xinglong TNT optical Upper Limit
  81. GRB 070129: Swift-XRT Refined Analysis
  82. GRB 070129: VLT observations
  83. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  84. GRB 070129: Swift detection of a burst
  85. GRB 070126: Swift/UVOT refined analysis
  86. GRB 070125: optical observations
  87. GRB 070126: VLT observations
  88. GRB070125: Optical observation by Kanata
  89. GRB070124: Swift-XRT Observation
  90. Possible GRB 070126: Swift/UVOT Upper Limit
  91. GRB 070125: UVOT Observations of a Fading Optical Afterglow
  92. GRB 070125: Xinglong TNT optical observations
  93. GRB 070125: Continued P60 Observations
  94. GRB070125: Swift-XRT Refined Analysis
  95. GRB 070125: SARA detection in R
  96. GRB 070125: P60 Optical Afterglow Candidate
  97. GRB 070126?: Swift detection of a possible burst
  98. GRB070125 redshift request
  99. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  100. GRB 070110: Swift detection of a burst with a possible optical afterglow

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