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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"

19718 results found.

  1. GRB 160630A: GROND Afterglow Detection
  2. GRB 160630A: Swift detection of a burst
  3. GRB 160629A: TAROT Calern observatory optical detection
  4. GRB 160625B: TSHAO optical observations, correction GCN 19619
  5. GRB 160625B: TSHAO optical observations
  6. GRB 160623A: SAO RAS optical observations
  7. GRB 160625B: Global MASTER-Net prompt optical emission detection
  8. GRB 160625B: SAO RAS optical observations
  9. GRB 160625B: TSHAO optical observations
  10. GRB 160625B: Mini-MegaTORTORA detection of bright optical flash simultaneous with LAT event
  11. GRB 160625B: RATIR Optical and NIR Observations
  12. GRB 160625B: MITSuME Ishigakijima Optical Observation
  13. Swift Trigger 701668 is probably not an astrophysical event
  14. IPN Triangulation of GRB 160620A (short/hard)
  15. GRB 160625A: Swift/UVOT Upper Limits
  16. Trigger 701590: Swift detection of a bright outburst from SGR 1935+2154
  17. GRB 160625B: Swift/UVOT Detection
  18. GRB 160625B: RATIR Optical and NIR Afterglow Detection
  19. GRB 160625B: Swift-XRT afterglow detection
  20. GRB 160625A: Enhanced Swift-XRT position
  21. GRB 160625B: Tiled Swift observations
  22. GRB 160625B: Fermi-LAT detection of a bright burst
  23. GRB 160625A: Swift-XRT observations
  24. GRB 160624A: Swift/UVOT Upper Limits
  25. GRB 160624A: Lulin observation
  26. GRB 160623A: MITSuME Ishigakijima Optical Observation
  27. GRB 160624A: MITSuME Ishigakijima upper limits
  28. GRB 160624A, Swift-BAT refined analysis
  29. GRB 160623A: Swift/UVOT Upper Limits
  30. GRB 160623A: RATIR Optical and NIR Observations, Afterglow Confirmation
  31. GRB 160624A: Enhanced Swift-XRT position
  32. GRB160624A:possible GRB host redshift
  33. GRB 160623A: Mondy optical observations
  34. GRB 160624A: Swift detection of a short burst
  35. GROND observations of GRB 160622A/SNR RCW 103/SGR 1617-5103
  36. Trigger 701182: Swift detection of SGR 1935+2154
  37. GRB 160623A / Galactic transient: Fermi-LAT detection
  38. GRB 160623A: Swift ToO observations
  39. SGR 1617-5103 (BAT trigger 700791): Enhanced Swift-XRT position.
  40. Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
  41. BAT trigger 700791 (possible GRB 160622A) is SNR RCW 103
  42. GRB 160622A: Swift detection of a possible short GRB or a new SGR
  43. GRB 160612A: Swift-XRT observations
  44. GRB 160612A: Swift ToO observations
  45. IPN Triangulation of GRB 160612A (short/hard)
  46. GRB 160611A: Swift/UVOT observations
  47. GRB 160611A: Swift-BAT refined analysis
  48. GRB 160611A: Enhanced Swift-XRT position
  49. GRB 160611A: Swift-XRT observations
  50. SWIFT J174540.2-290037, Swift-BAT refined analysis (trigger 690197)
  51. SWIFT J174540.2-290037, Swift-BAT refined analysis (trigger 689956)
  52. Trigger 689956: Swift detection of a source near the Galactic center
  53. GRB 160607A: Swift/UVOT Upper Limits
  54. GRB 160607A: GROND confirmation of the afterglow
  55. GRB 160607A: candidate optical afterglow from the NOT
  56. Trigger 689353 (possible transient near Sgr A*), Swift-BAT refined analysis
  57. GRB 160607A: Enhanced Swift-XRT position
  58. GRB 160607A: Swift detection of a bright burst
  59. Trigger 689353: Swift detection of a transient near Sgr A*
  60. GRB 160601A: AbAO optical observations
  61. GRB 160601A: Swift/UVOT Upper Limits
  62. GRB 160601A: GTC observations confirming transient source decay
  63. GRB 160601A: Mondy optical observations, photometry of NOT sources
  64. GRB160601A: NOT afterglow confirmation
  65. GRB160601A: NOT detection of an afterglow candidate
  66. GRB 160601A: Enhanced Swift-XRT position
  67. GRB 160601A: Mondy optical observations
  68. GRB 160601A: MITSuME Okayama Ks-band upper-limit
  69. GRB 160601A: MITSuME Okayama upper limits
  70. GRB 160601A: Swift detection of a short hard burst
  71. GRB 160530A: discovery with the Compton Spectrometer and Imager
  72. GRB 160530A: Tiled Swift observations
  73. GRB 160525B: Mondy optical upper limit
  74. GRB 160525B: Khureltogot optical upper limit
  75. GRB 160525B: Swift-BAT refined analysis
  76. GRB 160525B: Nanshan optical upper limit
  77. GRB 160525B: Swift/UVOT Detection
  78. GRB 160521B: Swift-XRT afterglow detection
  79. GRB 160525B: Enhanced Swift-XRT position
  80. GRB 160525B: Swift detection of a burst
  81. GRB 160521B: Theoretical estimate of the redshift and urgent need for further x-ray observations
  82. Another Swift detection of SGR 1935+2154 (trigger #687124)
  83. Swift detection of SGR 1935+2154
  84. GRB 160521B: Swift ToO observations
  85. Konus-Wind observation of a bright burst from SGR 1935+2154
  86. SGR 1935+2154: AbAO optical upper limit
  87. Trigger 686761: Swift detection of a bright burst from SGR 1935+2154
  88. Trigger 686443: Swift detection of SGR 1935+2154
  89. GRB 160509A: CALET Gamma-Ray Burst Monitor detection
  90. GRB 160509A: non-observation of VHE emission with HAWC
  91. GRB 160508A: CALET Gamma-Ray Burst Monitor detection
  92. GRB 160509A Gemini North redshift
  93. GRB 160509A: Fermi GBM Detection
  94. GRB 160509A Gemini North candidate afterglow
  95. GRB 160509A: optical observations
  96. GRB 160509A: Swift-XRT afterglow detection
  97. GRB 160509A: Preliminary XRT positon
  98. GRB 160509A: Tiled Swift observations
  99. GRB 160506A: TAROT La Silla observatory optical observations
  100. GRB 160506A: IRSF upper limits

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