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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"

16160 results found.

  1. GRB 100522A: BOOTES-2 optical limit
  2. GRB 100418A: CrAO optical observations
  3. GRB 100518A: GROND afterglow observation and photo-z
  4. GRB 100518A: Swift/UVOT Upper Limits
  5. GRB 100518A: optical afterglow decay
  6. GRB 100518A: BOOTES-3 optical observations
  7. GRB 100513A: MITSuME Akeno Optical Observation
  8. GRB 100517A: MASTER-Net wide field camera prompt optical observations
  9. GRB 100514A: optical afterglow confirmation
  10. GRB 100514A: Swift/UVOT Observations
  11. GRB 100514A: YNAO-GMG observations
  12. GRB 100514A: MASTER-Net optical observations
  13. GRB 100514A: Faulkes Telescope South observations
  14. GRB 100513A, RIMOTS optical upper limits
  15. GRB 100513A: Gemini/GMOS Spectroscopic Redshift
  16. GRB 100513A: PAIRITEL continued observations and confirmation of fading
  17. GRB100504A: Optical upper limits at IAO
  18. GRB 100511A, RIMOTS optical upper limits
  19. GRB100508A: Further Swift/UVOT Observations
  20. GRB 100508A: GROND Detection of the optical afterglow
  21. GRB 100508A: ROTSE-III Optical Limits
  22. GRB 100418A: RTT150 optical observations
  23. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  24. GRB 100418A: Flattening of the Swift/UVOT Optical Light Curve
  25. GRB 100423A: xinglong TNT optical upper limit
  26. GRB 100420A: Terskol optical upper limit
  27. GRB 100418A: RTT150 optical observations
  28. GRB 100414A : EVLA Radio Detection
  29. GRB 100414A : WSRT Radio Detection
  30. GRB 100423A: CrAO optical observations
  31. GRB 100418A: Terskol optical observations
  32. GRB 100424A: CrAO optical observations
  33. GRB 100424A: Swift/UVOT Upper Limits
  34. GRB 100425A: VLT/X-shooter redshift
  35. GRB 100425A: GROND afterglow observation
  36. GRB 100424A: D50 optical limits
  37. GRB 100425A: candidate optical afterglow from the VLT
  38. GRB100424A: MITSuME optical upper limits
  39. GRB100423A: MITSuME optical upper limits
  40. GRB 100424A: GROND Upper Limits
  41. GRB 100424A: NOT optical observations
  42. GRB 100420A: GRT Optical Observation
  43. GRB 100418A: ROVOR optical measurements at 35 hours
  44. Swift Trigger 420256: D50 optical limits
  45. Swift Trigger 420256: ROTSE-III Optical Limits
  46. Radio afterglow detection of GRB 100418A with the EVLA
  47. GRB 100418A: Continued PAIRITEL NIR Observations
  48. GRB 100418A: WSRT Radio Detection
  49. GRB100418A: REM possible afterglow detection
  50. GRB 100418A: Continuing Swift/UVOT Observations
  51. GRB 100418A: RTT150 optical observations
  52. GRB100420A: MITSuME optical upper limits
  53. GRB 100414A: CFHT optical observations
  54. GRB 100420A: Swift/UVOT Upper Limits
  55. GRB 100418A: RTT150 observations during the optical afterglow maximum
  56. GRB 100418A: optical observations
  57. GRB 100418A: MASTER-Net optical observations
  58. GRB 100418A: VLT optical observations
  59. GRB 100420A: ROTSE-III Optical Limits
  60. GRB 100418A PAIRITEL NIR Observations
  61. GRB 100418A: ROVOR optical afterglow detection
  62. GRB 100418A: host galaxy detection in the SDSS
  63. GRB100414A: SAO RAS optical observations
  64. GRB 100418A: ROTSE-III Optical Limits
  65. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  66. GRB 100413A: Radio Afterglow Detection with the EVLA
  67. GRB 100414A: Gemini-N observation (correction)
  68. GRB 100414A: GROND Detection of the Optical Afterglow
  69. GRB 100413A: GROND Upper limits
  70. GRB 100413A: Swift/UVOT Upper Limits
  71. GRB 100413: xinglong TNT optical upper limit
  72. GRB 100413A: MASTER-Net optical observations
  73. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  74. MASTER observations on the Swift second trigger on LS V +44 17
  75. GRB 100331B: GROND Upper limits
  76. Master-Net observations on the Swift trigger on LS V +44 17
  77. GRB 100401A: Swift/UVOT Upper Limit
  78. GRB 100316A: R-band limit
  79. GRB 100331B: Swift/UVOT Upper Limits
  80. GROND observations of GRB100316D/SN2010bh
  81. Emerging Supernova in the Afterglow of GRB 100316D
  82. SGR 1833-0832: Swift/UVOT Upper Limits
  83. GRB 100319A: correction to GCN 10527
  84. GRB 100219A: MASTER-Net optical alert observations
  85. GRB 100316D: Pre-burst emission measured by BAT
  86. GRB 100219A: optical upper limit
  87. GRB 100316A: optical observations in CrAO
  88. GRB 100316D: Swift XRT enhanced position and further refined analysis
  89. GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
  90. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
  91. GRB 100316B: Swift/UVOT observations
  92. GRB 100316A: TAROT Calern observatory optical observations
  93. GRB 100316B: VLT/X-shooter redshift
  94. GRB 100316B: GROND Detection of the Optical/NIR Afterglow Candidate
  95. GRB 100316B: Swift detection of a burst with optical counterpart
  96. GRB 100316 optical candidate from 1.23m CAHA telescope
  97. GRB 100316 optical candidate from 1.23m CAHA telescope
  98. GRB100305A: Optical upper limits at IAO
  99. GRB 100305A: Gemini z'-band observation
  100. GRB 100305A Optical Observations

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