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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"

15742 results found.

  1. GRB 090417B: optical observations
  2. GRB090417B: optical observations
  3. GRB 090410: MITSuME optical upper limits
  4. GRB090408 : TAOS optical observations
  5. GRB090408, RIMOTS optical upper limits
  6. GRB 090408: Xinglong TNT optical Upper Limit
  7. GRB 090408B: MASTER II-Kourovka optical observations
  8. GRB 090407: Swift UVOT Upper Limits
  9. GRB 090407: ROTSE-III Optical Limits
  10. GRB 090404: millimeter detection
  11. Swift/UVOT observations of GRB090404
  12. GRB 090404: optical observations at BOOTES-3 and 1.5-m OSN
  13. GRB 090404: Xinglong TNT optical Upper Limit
  14. GRB 090401B: Xinglong TNT optical Upper Limit
  15. GRB 090401B: Upper limits of MITSuME optical observation
  16. GRB090401B, RIMOTS optical upper limits
  17. GRB 090401B: NOT optical observations
  18. Swift/UVOT observations of GRB090401B
  19. Swift/UVOT observations of GRB090401B
  20. Swift/UVOT detection of GRB090401B
  21. GRB 090401B: Swift detection of a burst
  22. GRB 090328B: MASTER-Irkutsk prompt optical short burst observations
  23. GRB 090323: Further TLS detections - a break?
  24. GRB 090328: Radio afterglow detection
  25. GRB 090328: BOOTES-3 optical observations
  26. GRB 090328: GROND Detection of the Optical/NIR Afterglow
  27. GRB 090328: Gemini South Redshift
  28. GRB090323: Optical observations from NOT
  29. GRB 090328: Swift UVOT observations
  30. GRB 090323: WSRT Radio Detection
  31. GRB 090328: Updated position/optical afterglow candidate
  32. GRB 090323: Radio afterglow detection
  33. GRB 090320B: MASTER-Net prompt optical observations
  34. GRB 090323: RTT150 optical observations
  35. GRB 090323: Lick observations
  36. GRB 090323: Optical observation of xinglong TNT
  37. GRB 090323: UVOT Detection of Afterglow
  38. Further 15GHz observations of GRB090313
  39. GRB 090313: WSRT Radio Detection
  40. GRB 090313: VLT spectroscopy
  41. GRB090313: radio detection with the VLA
  42. GRB 090313, SMARTS optical/IR observations
  43. Further Swift/UVOT observations of GRB 090313
  44. GRB 090313: detection with CARMA in 3mm band
  45. GRB090305B: MASTER-net prompt optical short burst observations
  46. Radio detection of GRB090313
  47. GRB 090313: MITSuME Okayama observation
  48. GRB 090313: Additional Gemini-S photometry
  49. GRB 090313: WSRT Radio Observations
  50. GRB 090313: Light curve steepening
  51. GRB 090313: TAROT La Silla observatory optical detection
  52. GRB 090313: Gemini-S photometry
  53. GRB 090313: Zadko Telescope observations
  54. GRB 090313 - PAIRITEL NIR detections
  55. GRB 090313: Gemini-S redshift
  56. GRB 090313 optical observations
  57. GRB 090313: Ongoing plateau phase
  58. GRB 090313: Swift-XRT refined analysis
  59. GRB 090313: Swift/UVOT upper limits
  60. GRB 090313: Faulkes Telescope North observations
  61. GRB 090313: Sustained optical brightness (correction)
  62. GRB 090313: Sustained optical brightness
  63. GRB 090313: SDSS object underlying the optical afterglow position
  64. GRB 090309A: GROND upper limits
  65. GRB 090307A: TAROT Calern observatory optical observations
  66. GRB 090309: Swift/UVOT Upper Limits
  67. GRB 090308: Swift/UVOT Upper Limits
  68. GRB 090307: GROND Upper Limits
  69. Radio observation of GRB 090201 with ATCA
  70. Radio observation of GRB 081226a with ATCA
  71. Radio observation of GRB 081007 with ATCA
  72. GRB 090305: Swift-XRT refined analysis
  73. GRB 090305, Swift-BAT refined analysis
  74. GRB 090305: Magellan confirmation of the optical afterglow
  75. GRB090305: GMOS-S Candidate Optical Afterglow
  76. GRB 090205: VLT optical decay
  77. GRB 090205: Swift/UVOT Upper Limits
  78. GRB 090205: VLT refined redshift
  79. GRB 090205: Swift burst of interest
  80. GRB 090205: VLT spectroscopic redshift
  81. GRB090201: Swift UVOT upper limits
  82. GRB 090201: object inside the enhanced XRT error circle
  83. GRB 090201: VLT NIR observations
  84. GRB090113: MAGIC telescope GeV observation
  85. GRB 090201: ROTSE-III Optical Limits
  86. GRB 090102: HST observations and host galaxy
  87. GRB 090118: no afterglow candidate
  88. GRB 090123: Swift/UVOT Observations
  89. GRB 090118 (BATSS): GRT Optical Observation
  90. GRB 090118: Possible burst detection from Swift-BAT slew data
  91. GRB090102: MAGIC telescope GeV observation
  92. GRB 090113: LOAO Detection Limits in R, I, z, Y-band
  93. GRB 090113: GROND Upper Limits
  94. GRB 090113: ROTSE-III Optical Limits
  95. GRB 090102: WSRT Radio Observations
  96. GRB 090107B: Swift/UVOT Observations
  97. GRB 090107B optical observations
  98. GRB 090107B: ROTSE-III Optical Limits
  99. GRB 090102: optical decay
  100. GRB 090102: GRT Optical Observation

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