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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"

16146 results found.

  1. GRB 141220A: LT optical afterglow observations
  2. GRB 141220A: Swift detection of a burst with an optical afterglow
  3. GRB 141121A: Keck observations
  4. GRB 141212A iTelescope observation
  5. GRB 141212A: Zadko observatory - Gingin optical observations
  6. GRB 141212B: MITSuME Akeno upper limits
  7. GRB 141212A: Swift/UVOT Upper Limits
  8. GRB 141212B: Swift/UVOT Upper Limits
  9. GRB 141212A: MITSuME Okayama upper limits
  10. GRB 141212A: extended object within the XRT error circle
  11. GRB141212A: xinglong TNT upper limit
  12. GRB 141212A: Khureltogot optical upper limit
  13. GRB 141212A: MASTER early optical observations
  14. GRB 141212A: Skynet R-COP Observations
  15. GRB 141212A: MITSuME Akeno upper limits
  16. GRB141208.63: MASTER OT Detection During the Fermi Error Box inspection
  17. GRB141202A: Discovery Channel Telescope Optical Observations
  18. GRB141207A: Discovery Channel Telescope Optical Observations
  19. GRB 141207A: Swift-UVOT Observations
  20. GRB141121A: Discovery Channel Telescope Optical Observations
  21. GRB 141205A: Nanshan optical upper limit
  22. GRB 141202A: Swift/UVOT Detection of a Variable Source Near the IPN Error Box
  23. GRB 141121A: Mondy optical observations
  24. GRB 141130A: Mondy optical observations
  25. GRB 141130A: Mondy optical light curve
  26. GRB 141030A: Nanshan very early optical observations
  27. GRB 141121A: Continued RATIR Optical Observations
  28. GRB 141121A: VLA radio detection
  29. GRB 141130A: Nanshan optical observations
  30. GRB 141130A: Mondy optical observations
  31. GRB 141130A: Swift detection of a burst with an optical counterpart
  32. GRB 141121A: Continued RATIR Optical Observations
  33. GRB 141121A: Mondy optical observations
  34. GRB 141121A: TSHAO optical observations
  35. GRB 141121A: Continued RATIR Optical Observations
  36. GRB 141121A: RATIR Optical Observations - Errata for GCN 17105
  37. GRB 141121A: MITSuME Ishigakijima Optical Observation after 7 days
  38. GRB 141121A: Khureltogot optical observations
  39. GRB 141121A: Mondy optical observations
  40. GRB 141121A: RATIR Optical and NIR Observations
  41. GRB 141121A: three epochs of SAO RAS optical observations
  42. GRB 141121A: Continued RATIR Optical Observations
  43. GRB 141121A: WSRT radio detection
  44. GRB 141121A: TSHAO optical observations
  45. GRB 141121A: Continued Mondy optical observations
  46. GRB 141121A: Continued RATIR Optical Observations
  47. GRB 141121A: RATIR Optical Observations - Steeper Fading
  48. GRB 141121A: AMI 15 GHz detection
  49. GRB 141121A: MITSuME Ishigakijima Optical Observation after 3 days
  50. GRB 141124A​: iPTF upper limits​
  51. GRB 141121A: RATIR Optical Observations - Fading Again
  52. GRB 141118A: Fermi GBM Detection
  53. GRB 141121A: Mondy optical observations
  54. GRB 141121A: LCO-FTN rebrightening confirmation
  55. GRB 141121A: MITSuME Ishigakijima Optical Observation
  56. GRB 141121A: Continued RATIR Optical Observations - Rebrightening
  57. GRB 141121A: AAO optical observations
  58. GRB 141121A: MITSuME Akeno Optical observation
  59. GRB 141121A: Continued RATIR Optical Observations
  60. GRB 141121A: Swift/UVOT Detections
  61. GRB 141121A: RATIR Optical Observations
  62. GRB 141121A: LCO-FTN observations
  63. GRB 141118A: iPTF Optical Observations
  64. GRB 141109A: further VLA observations
  65. GRB 141109A: VLA detection
  66. Trigger 618634: Swift detection of Vela X-1
  67. GRB 141109B: optical upper limits
  68. GRB 141015A: TAROT La Silla observatory optical observations
  69. GRB 141022A: TAROT La Silla observatory optical observations
  70. GRB 141031A: TAROT La Silla observatory optical observations
  71. GRB 141109A: TAROT La Silla observatory optical observations
  72. GRB 141109A: AAO optical observations
  73. GRB 141109A: Terskol photometry
  74. GRB 141109B: Swift/UVOT Upper Limits
  75. GRB 141109A: Swift/UVOT Detection
  76. GRB 141109A: NOT r-band observation
  77. GRB 141109B: MITSuME Akeno upper limits
  78. GRB141109A : Xinglong TNT optical observation
  79. GRB 141109A: MITSuME Ishigakijima upper limits
  80. GRB 141109B: BOOTES-4 and TERSKOL optical upper limit
  81. GRB 141109A: CQUEAN Detection at 0.85 - 1.05 micron
  82. GRB 141109A: GROND afterglow observation
  83. X-shooter redshift of GRB 141109A
  84. GRB 141109A: REM NIR candidate afterglow
  85. GRB 141104A: Swift-XRT observations
  86. GRB 141028A: Mondy optical observations
  87. GRB 141026A: CrAO optical observation
  88. GRB
  89. GRB 141026A: Gemini-North optical and NIR imaging
  90. GRB 141028A: TShAO optical observation
  91. GRB 141031B: TShAO optical observations
  92. GRB 141017A: Skynet PROMPT-CTIO/SSO Observations
  93. GRB 141022A: Skynet PROMPT-CTIO Observations
  94. GRB 141026A: VLA observations
  95. GRB 141031B: RATIR Optical and NIR Observation
  96. GRB 141031B: Swift/UVOT Upper Limits
  97. MAXI GRB 141029A is likely an X-ray flare from 1RXS J043657.1-161258
  98. GRB 141031B: Bassano Bresciano Observatory upper limit
  99. GRB 141031B: NOT optical observations
  100. GRB 141031B: MITSuME Ishigakijima upper limits

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