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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"

27241 results found.

  1. GRB 160630A: Swift-XRT refined Analysis
  2. GRB 160625A: GROND upper limits
  3. GRB 160629A: Fermi GBM observation
  4. GRB 160630A: GROND Afterglow Detection
  5. GRB 160630A: Swift detection of a burst
  6. GRB 160629A: SAO RAS independent OT detection
  7. GRB 160629A: TAROT Calern observatory optical detection
  8. GRB 160625B CALET Gamma-Ray Burst Monitor detection
  9. Pi of the Sky detection of an optical flash accompanying GRB 160625B
  10. GRB 160623A: SAO RAS optical observations
  11. GRB 160625B: Global MASTER-Net prompt optical emission detection
  12. GRB 160625B: SAO RAS optical observations
  13. GRB 160625B: TSHAO optical observations
  14. GRB 160625B: Mini-MegaTORTORA detection of bright optical flash simultaneous with LAT event
  15. GRB 160625B: RATIR Optical and NIR Observations
  16. GRB 160625B: TNG redshift confirmation
  17. GRB 160625B: VLT/X-shooter redshift
  18. Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
  19. GRB 160623A CALET Gamma-Ray Burst Monitor detection
  20. Swift-BAT refined analysis on the bright event from SGR 1935+2154
  21. Swift Trigger 701668 is probably not an astrophysical event
  22. GRB 160625A: Swift/UVOT Upper Limits
  23. GRB 160625A: Swift-BAT refined analysis
  24. GRB 160625A: Swift-XRT refined Analysis
  25. Trigger 701590: Swift detection of a bright outburst from SGR 1935+2154
  26. GRB 160625B: Swift/UVOT Detection
  27. GRB 160625B: RATIR Optical and NIR Afterglow Detection
  28. GRB 160625B: Fermi GBM refined analysis
  29. GRB 160625B: Fermi-LAT refined analysis
  30. GRB 160623A: SMA submm afterglow observations
  31. GRB 160625B: Fermi GBM initial observations
  32. GRB 160625B: Fermi-LAT detection of a bright burst
  33. GRB 160625A - two different events?
  34. GRB 160625A: Swift-XRT observations
  35. GRB 160625A: Swift detection of a burst
  36. GRB 160624A: Swift/UVOT Upper Limits
  37. GRB 160624A: Swift-XRT refined Analysis
  38. GRB 160624A: Fermi GBM observation
  39. GRB 160624A, Swift-BAT refined analysis
  40. GRB 160623A: Swift/UVOT Upper Limits
  41. GRB 160623A: RATIR Optical and NIR Observations, Afterglow Confirmation
  42. GRB 160624A: Swift detection of a short burst
  43. Swift detection of a dust-scattered halo around GRB 160623A
  44. GROND observations of GRB 160622A/SNR RCW 103/SGR 1617-5103
  45. Trigger 701182: Swift detection of SGR 1935+2154
  46. GRB 160623A: Fermi GBM detection/observation
  47. GRB 160623A / Galactic transient: Fermi-LAT detection
  48. SGR 1617-5103 (BAT trigger 700791): Enhanced Swift-XRT position.
  49. Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
  50. Fermi GBM Trigger 160622573 is not a GRB
  51. BAT trigger 700791 (possible GRB 160622A) is SNR RCW 103
  52. GRB 160622A: Swift detection of a possible short GRB or a new SGR
  53. More FERMI GBM bursts from the magnetar SGR 1935+2154
  54. Fermi GBM trigger 488128598/160620637 is not a GRB
  55. Fermi GBM trigger 487974449/160618852 is not a GRB
  56. Konus-Wind observation of GRB 160612A
  57. BAT detection and localization of GRB 160612A
  58. GRB 160612A: Fermi GBM detection
  59. GRB 160611A: Swift/UVOT observations
  60. GRB 160611A: Swift-BAT refined analysis
  61. Swift Trigger 690738 is not an astrophysical event
  62. GRB 160611A: Swift-XRT refined Analysis
  63. GRB160611.9 MASTER-Net OT detection
  64. GRB 160611A: Swift-XRT observations
  65. GRB 160611A: Swift detection of a burst
  66. SWIFT J174540.2-290037, Swift-BAT refined analysis (trigger 690197)
  67. GRB 160525C: Astrosat CZTI detection
  68. GRB 160508A: Astrosat CZTI detection
  69. SWIFT J174540.2-290037, Swift-BAT refined analysis (trigger 689956)
  70. GRB 160607A CALET Gamma-Ray Burst Monitor detection
  71. Swift detection of SWIFT J174540.2-290037
  72. Swift detection of SWIFT J174540.2-290037
  73. Trigger 689956: Swift detection of a source near the Galactic center
  74. GRB 160607A: Swift/UVOT Upper Limits
  75. GRB 160607A: GROND confirmation of the afterglow
  76. Konus-Wind observation of GRB 160607A
  77. GRB 160607A: candidate optical afterglow from the NOT
  78. GRB 160607A: Swift-BAT refined analysis
  79. Trigger 689353 (possible transient near Sgr A*), Swift-BAT refined analysis
  80. GRB 160607A: Swift-XRT refined Analysis
  81. GRB 160607A: Swift detection of a bright burst
  82. Fermi GBM trigger 486907024/160606498 is not a GRB
  83. Trigger 689353: Swift detection of a transient near Sgr A*
  84. GRB 160601A: Discovery Channel Telescope Limits
  85. GRB 160601A: Swift/UVOT Upper Limits
  86. GRB 160601A: Swift-BAT refined analysis
  87. Fermi GBM trigger 486562774/160602514 is not a GRB
  88. GRB160601A: Gemini Imaging
  89. GRB 160601A: GTC observations confirming transient source decay
  90. GRB 160601A: Mondy optical observations, photometry of NOT sources
  91. GRB 160530B CALET Gamma-Ray Burst Monitor detection
  92. GRB 160601A: Swift-XRT refined Analysis
  93. GRB 160601A: MITSuME Okayama Ks-band upper-limit
  94. GRB 160601A: MASTER-Net observations
  95. GRB 160601A: Swift detection of a short hard burst
  96. GRB 160530B: Fermi GBM Detection
  97. GRB 160525C: CALET Gamma-Ray Burst Monitor detection
  98. GRB 160525B: Swift-BAT refined analysis
  99. GRB 160525B: Swift-XRT refined Analysis
  100. GRB 160525B: Swift/UVOT Detection

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