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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"

43849 results found.

  1. GRB 160401A: a long GRB detected by INTEGRAL
  2. GRB 160327A: Continued RATIR Optical and NIR Observations
  3. LIGO/Virgo G211117: LOFAR follow-up
  4. GRB 160324A: CALET Gamma-Ray Burst Monitor detection
  5. GRB 160327A: Imaging and spectroscopy from GTC
  6. Konus-Wind observation of GRB 160325A
  7. GRB 160327A: Continued RATIR Optical and NIR Observations
  8. GRB 160327A: KAIT optical afterglow confirmation
  9. GRB 160327A: Mondy optical upper limit
  10. GRB 160327A: Swift-BAT refined analysis
  11. GRB 160327A: Swift-XRT refined Analysis
  12. GRB 160327A: Enhanced Swift-XRT position
  13. GRB 160327A: RATIR Optical and NIR Afterglow Detection
  14. GRB 160327A: Swift detection of a burst
  15. GRB 160325A, Swift-BAT refined analysis
  16. GRB 160325A: GROND Upper Limits
  17. GRB 160325A: Swift-XRT refined Analysis
  18. GRB 160325A: Further Swift/UVOT Observations
  19. GRB 160325A: afterglow confirmation
  20. GRB 160325A: Enhanced Swift-XRT position
  21. GRB160325A Swift/UVOT Detection
  22. GRB 160325A: Fermi-LAT detection
  23. Swift Trigger 680457 is not a GRB
  24. LIGO/Virgo G211117: CALET GBM Observations
  25. GRB 160325A: Fermi GBM detection
  26. GRB160325A: REM NIR observations
  27. GRB 160325A: Swift detection of a burst
  28. Swift detects GX 301-2 in very high state
  29. Fermi Gamma-ray Burst Monitor trigger 160323546 is not a GRB
  30. GRB 160321A: AbAO optical observations
  31. GRB 160321A: Possible RATIR Optical and NIR Detections
  32. GRB 160321A: Swift-BAT refined analysis
  33. GRB 160321A: Swift-XRT refined Analysis
  34. GRB 160316A: CALET Gamma-Ray Burst Monitor detection
  35. GRB 160321A: Enhanced Swift-XRT position
  36. GRB 160321A: MASTER observations zero Galaxy latitude GRB
  37. GRB 160321A: Swift detection of a probable burst
  38. GRB 160310A: Terskol 2-m observations
  39. IPN Triangulation of GRB 160310A
  40. LIGO/Virgo G211117: EWE for NOWT follow-up of northern sky
  41. SGR 0755-2933, Swift-BAT refined analysis
  42. GRB 160131A: 15 GHz upper limits from AMI-LA
  43. GRB 160310A: A further Swift-XRT observation, no afterglow detected
  44. Swift detection of a likely new SGR: SGR 0755-2933
  45. GRB 160314A: Continued RATIR Optical and NIR Observations
  46. GRB 160313A: Mondy optical upper limit
  47. GRB 160314A: GROND optical/NIR observations
  48. GRB 160314A: ISON-Ussuriysk optical upper limit, updated photometry and correction of GCN 19184
  49. GRB 160314B: Fermi GBM observation
  50. GRB 160314B: Fermi-LAT detection
  51. GRB 160314A: RATIR Optical and NIR Observations
  52. GRB 160314A: Mondy optical observations
  53. GRB 160313A: Swift/UVOT Upper Limits
  54. LIGO/Virgo G194575: EWE for NOWT follow-up of northern sky
  55. GRB 160314A: VLT/X-shooter redshift
  56. GRB 160314A: NOT afterglow observations
  57. GRB 160314A: Swift-XRT refined Analysis
  58. GRB 160314A: Optical observations from OSN
  59. GRB 160314A: Swift-BAT refined analysis
  60. GRB 160314A: Swift/UVOT Detection
  61. GRB 160228A: GROND afterglow confirmation and X-shooter host candidate redshift
  62. GRB 160314A: Enhanced Swift-XRT position
  63. GRB 160314A: ISON-Ussuriysk optical upper limit
  64. GRB 160314A: Weihai optical upper limit
  65. GRB 160314A: Swift detection of a burst
  66. GRB 160313A, Swift-BAT refined analysis
  67. Fermi GBM trigger 479509107/160312874 is not a GRB
  68. GRB 160313A: Chante-Perdrix Observatory optical observations
  69. GRB 160313A: MASTER-Net optical observations
  70. GRB 160313A: LT observations
  71. GRB 160313A: Swift-XRT refined Analysis
  72. GRB 160313A: TAROT Calern observatory optical observations
  73. GRB 160313A: Enhanced Swift-XRT position
  74. GRB 160313A: RATIR Optical and NIR Observations
  75. GRB 160313A: SAO RAS observations
  76. GRB 160313A: Swift detection of a burst
  77. GRB 160310A: MASTER-Kislovods observations
  78. GRB 160310A: Further NOT observations
  79. GRB 160310A: Swift/UVOT Upper Limits
  80. Konus-Wind observation of GRB 160310A (possible ultra-long GRB?)
  81. GRB 160310A: RATIR Optical and NIR Observations
  82. GRB 160307A: CALET Gamma-Ray Burst Monitor detection of a possible short GRB
  83. GRB 160310A: NOT optical observations
  84. GRB 160310A: LCOGT-SAAO optical upper limits
  85. GRB 160310A: Swift-XRT observations
  86. GRB 160310A: Fermi GBM observation
  87. GRB 160303A: GTC imaging of possible host galaxy
  88. GRB 160310A: Swift ToO observations
  89. GRB 160310A: Fermi-LAT detection
  90. Swift Trigger 678197 is a noise fluctuation
  91. LIGO/Virgo G211117: HAWC follow-up of northern sky
  92. Trigger 677981: Swift detection of IGRJ17091-3624
  93. GRB 160303A: X-shooter spectroscopy
  94. Swift trigger 677890 is noise
  95. GRB 160303A: Continued optical monitoring from NOT
  96. GRB160303A: further GROND observations
  97. GRB 160303A: 9.8 GHz VLA upper limit
  98. GRB 160303A, Swift-BAT refined analysis
  99. GRB 160303A: MMT Optical Detection
  100. GRB 160303A: Continued RATIR Optical and NIR Observations

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