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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"

45782 results found.

  1. GRB 141212A iTelescope observation
  2. GRB 141212A: Zadko observatory - Gingin optical observations
  3. GRB 141212B: MITSuME Akeno upper limits
  4. Konus-Wind observation of GRB 141212B
  5. GRB 141212B: Swift-XRT refined Analysis
  6. GRB 141212A: Swift/UVOT Upper Limits
  7. GRB 141212B: Swift/UVOT Upper Limits
  8. GRB 141212A: VLA upper limit
  9. GRB 141212A: Gemini-N spectroscopy and photometry
  10. GRB 141212B: Swift-BAT refined analysis
  11. GRB 141212A: Swift-BAT refined analysis
  12. GRB 141212B: Enhanced Swift-XRT position
  13. Swift detection of 4U 1700+24 (= V934 Her)
  14. GRB 141212A: MITSuME Okayama upper limits
  15. GRB 141212A: Swift-XRT refined Analysis
  16. GRB 141212A: extended object within the XRT error circle
  17. GRB141212A: xinglong TNT upper limit
  18. GRB 141212A: Khureltogot optical upper limit
  19. GRB 141212A: 1.23m CAHA I-band observations
  20. GRB 141212B: initial Swift/UVOT observations
  21. GRB 141212B: Swift/XRT preliminary localization
  22. GRB 141212A: Enhanced Swift-XRT position
  23. GRB 141212A: Correction to GCN 17162
  24. GRB 141212A: MASTER early optical observations
  25. GRB 141212A: Skynet R-COP Observations
  26. GRB 141212A: MITSuME Akeno upper limits
  27. GRB 141212B: Swift detection of a burst
  28. GRB 141212A: Swift detection of a short burst
  29. GRB 141207A: Swift-XRT afterglow candidate detection
  30. GRB 141121A: further VLA observations
  31. Konus-Wind observation of GRB 141207A
  32. GRB141208.63: MASTER OT Detection During the Fermi Error Box inspection
  33. GRB141202A: Discovery Channel Telescope Optical Observations
  34. GRB141207A: Discovery Channel Telescope Optical Observations
  35. GRB 141207A: Swift-UVOT Observations
  36. GRB 141207A: Fermi GBM detection
  37. GRB 141207A: Swift-XRT observations
  38. Konus-Wind observation of GRB 141130A
  39. GRB 141207A Tiled Swift observations
  40. GRB 141207A: Fermi-LAT Detection
  41. GRB141121A: Discovery Channel Telescope Optical Observations
  42. GRB 141205A: Swift/UVOT Upper Limits
  43. GRB 141205A: Fermi GBM detection
  44. GRB 141205A: Nanshan optical upper limit
  45. GRB 141205A: XRT observations
  46. GRB 141205A Swift-BAT refined analysis
  47. GRB 141202A: Swift/UVOT Detection of a Variable Source Near the IPN Error Box
  48. GRB 141121A: Mondy optical observations
  49. GRB 141205A Short hard GRB found in ground analysis of BAT data
  50. Konus-Wind observation of GRB 141202A
  51. GRB 141130A: Mondy optical observations
  52. GRB 141202A: Swift XRT observations
  53. GRB 141202A: Fermi GBM Detection
  54. GRB 141202A Tiled Swift observations
  55. IPN Triangulation of GRB 141202A (short/hard)
  56. GRB 141130A: Mondy optical light curve
  57. GRB 141030A: Nanshan very early optical observations
  58. GRB 141121A: Continued RATIR Optical Observations
  59. GRB 141130A: Swift-BAT refined analysis
  60. GRB 141130A: Swift/UVOT Detection
  61. GRB 141130A: Swift-XRT refined Analysis
  62. GRB 141121A: VLA radio detection
  63. GRB 141130A: Enhanced Swift-XRT position
  64. GRB 141130A: Nanshan optical observations
  65. GRB 141130A: Mondy optical observations
  66. GRB 141130A: Swift detection of a burst with an optical counterpart
  67. GRB 141121A: Continued RATIR Optical Observations
  68. GRB 141121A: Mondy optical observations
  69. GRB 141121A: TSHAO optical observations
  70. GRB 141121A: Continued RATIR Optical Observations
  71. GRB 141121A: RATIR Optical Observations - Errata for GCN 17105
  72. GRB 141121A: MITSuME Ishigakijima Optical Observation after 7 days
  73. GRB 141121A: Khureltogot optical observations
  74. IPN Triangulation of GRB 141121A (initial episode)
  75. GRB 141121A: Mondy optical observations
  76. GRB 141121A: SPI-ACS/INTEGRAL observations
  77. GRB 141121A: RATIR Optical and NIR Observations
  78. Konus-Wind observation of GRB 141121A
  79. IPN Triangulation of GRB 141125A (short/hard)
  80. GRB 141121A: three epochs of SAO RAS optical observations
  81. GRB 141121A: Continued RATIR Optical Observations
  82. GRB 141121A: WSRT radio detection
  83. GRB 141121A: TSHAO optical observations
  84. GRB 141121A: Continued Mondy optical observations
  85. GRB 141121A: Continued RATIR Optical Observations
  86. GRB 141121A: RATIR Optical Observations - Steeper Fading
  87. GRB 141121A: AMI 15 GHz detection
  88. GRB 141121A: MITSuME Ishigakijima Optical Observation after 3 days
  89. GRB 141124A​: iPTF upper limits​
  90. GRB 141121A: RATIR Optical Observations - Fading Again
  91. GRB141124A: MASTER Detection of New Flare of QSO NVSS J075043+790917 During the Fermi Error Box inspection
  92. GRB 141118A: Fermi GBM Detection
  93. GRB 141121A: Mondy optical observations
  94. GRB 141121A: LCO-FTN rebrightening confirmation
  95. GRB 141121A: MITSuME Ishigakijima Optical Observation
  96. GRB 141121A: Continued RATIR Optical Observations - Rebrightening
  97. GRB 141121A: AAO optical observations
  98. GRB 141121A: MITSuME Akeno Optical observation
  99. GRB 141121A: Continued RATIR Optical Observations
  100. GRB 141121A: Swift-XRT refined Analysis

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