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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"

24807 results found.

  1. Swift follow up of IceCube-160731A
  2. GRB 160801A: Enhanced Swift-XRT position
  3. GRB 160801A: MITSuME Okayama upper limits
  4. GRB 160801A: Swift detection of a burst
  5. HAWC follow up of IceCube 160731
  6. GRB 160716A: TAROT La Silla observatory optical observations
  7. GBM observation of SGR-like burst from the direction of PSR 1119-6127
  8. Trigger 706396: Swift detection of a short burst from PSR 1119-6127
  9. GRB 160726A, Swift-BAT refined analysis
  10. GRB 160726A: Fermi GBM observation
  11. GRB 160726A: Swift detection of a short burst
  12. GRB 160703, GRB 160705, GRB 160720, SGR1935+2154: First SGRs and GRBs detected by Lomonosov.
  13. GRB 160720A: Fermi GBM detection
  14. GRB 160716A: Swift/UVOT Detection
  15. GRB 160714A: Swift/UVOT Upper Limits
  16. GRB 160716A: Swift-BAT refined analysis
  17. GRB 160716A: Swift-XRT refined Analysis
  18. GRB 160716A: Enhanced Swift-XRT position
  19. GRB 160716A: Swift detection of a burst
  20. Swift Trigger 704444 is probably not an astrophysical event.
  21. GRB 160712A: Swift-BAT refined analysis
  22. GRB 160714A: TAROT Calern observatory optical observations
  23. GRB 160714A: Swift-XRT observations
  24. GRB 160714A: Fermi GBM observation
  25. GRB 160623A: optical astrometry, photometry, and redshift
  26. Swift-BAT trigger 704327 was due to noise
  27. GRB 160714A: Swift-BAT refined analysis,
  28. Swift Trigger 704327: MASTER syncronous optical observations
  29. GRB 160712A: Further GROND observations
  30. Swift Trigger 704327: a possible GRB
  31. GRB 160714A: Optical observations from OSN
  32. GRB 160714A: Swift-XRT observations
  33. GRB 160712A: Swift/UVOT Upper Limits
  34. GRB 160712A: RATIR Optical and NIR Observations
  35. GRB 160712A: GROND observations
  36. GRB 160712A: Swift-XRT refined Analysis
  37. GRB 160712A: Skynet R-COP observations
  38. GRB 160712A: Enhanced Swift-XRT position
  39. GRB 160712A: Swift-XRT observations
  40. GRB 160709A, Swift-BAT detection and localization
  41. GRB 160625B: TSHAO optical observations
  42. GRB 160709A: Swift-XRT observations
  43. GRB 160709A: Global MASTER Net Fermi GBM Alerts observations
  44. GRB 160709A: Fermi GBM Observations
  45. GRB 160709A: Fermi-LAT detection
  46. GRB 160705B: TAROT Calern observatory optical observations
  47. GRB 160628A CALET Gamma-Ray Burst Monitor detection
  48. GRB 160629A: Mondy optical observations
  49. GRB 160629A: AbAO optical observations
  50. GRB 160703A: Keck-I/LRIS Optical Observations
  51. IPN Triangulation of GRB 160702A (short/hard)
  52. GRB 160705B: Swift/UVOT Upper Limits
  53. GRB 160705B: RATIR Optical and NIR Observations and Confirmation of the Fading Afterglow
  54. GRB 160705B: Swift-BAT refined analysis
  55. GRB 160705B: Swift-XRT refined Analysis
  56. GRB 160705B: Enhanced Swift-XRT position
  57. GRB 160705B: Swift detection of a burst
  58. GRB 160703A: Swift/UVOT Detection
  59. GRB 160703A: Swift-XRT afterglow detection
  60. GRB 160705A/MAXI J0748-149: MAXI/GSC detection
  61. GRB 160703A: MITSuME Ishigakijima Optical Observation
  62. GRB 160625B: RTT150 optical observations
  63. GRB 160703A: Bassano Bresciano Observatory upper limits
  64. GRB 160703A: Swift-BAT refined analysis
  65. GRB 160703A: Zadko observatory - Gingin optical observations
  66. GRB 160629A: AbAO optical observations
  67. Swift trigger #702630 is not an astrophysical event
  68. GRB 160629A: Swift/UVOT Upper Limits
  69. GRB 160625B: SAO RAS monitoring
  70. GRB 160629A: Swift-XRT afterglow detection
  71. GRB 160630A: Swift-BAT refined analysis
  72. GRB 160629A: Global MASTER Net Prompt OT observations
  73. GRB 160630A: Skynet PROMPT-CTIO observations of the optical afterglow
  74. GRB 160630A: Zadko observatory - Gingin optical observations
  75. GRB 160630A: TAROT La Silla observatory optical observations
  76. GRB 160630A: Swift/UVOT Upper Limits
  77. GRB 160630A: Swift-XRT refined Analysis
  78. GRB 160625A: GROND upper limits
  79. GRB 160629A: Fermi GBM observation
  80. GRB 160630A: REM NIR observations
  81. GRB 160630A: Enhanced Swift-XRT position
  82. GRB 160630A: GROND Afterglow Detection
  83. GRB 160630A: Swift detection of a burst
  84. GRB 160629A: TAROT Calern observatory optical detection
  85. GRB 160629A: a long GBB detected by INTEGRAL
  86. GRB 160625B: TSHAO optical observations, correction GCN 19619
  87. GRB 160625B: TSHAO optical observations
  88. GRB 160625B CALET Gamma-Ray Burst Monitor detection
  89. GRB 160623A: SAO RAS optical observations
  90. Konus-Wind observation of a bright burst from SGR 1935+2154
  91. GRB 160625B: Global MASTER-Net prompt optical emission detection
  92. GRB 160625B: SAO RAS optical observations
  93. GRB 160625B: TSHAO optical observations
  94. Konus-Wind observation of GRB 160625B
  95. GRB 160625B: Mini-MegaTORTORA detection of bright optical flash simultaneous with LAT event
  96. GRB 160625B: RATIR Optical and NIR Observations
  97. GRB 160625B: MITSuME Ishigakijima Optical Observation
  98. Swift Trigger 701668 is probably not an astrophysical event
  99. IPN Triangulation of GRB 160620A (short/hard)
  100. GRB 160625A: Swift/UVOT Upper Limits

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