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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"

41907 results found.

  1. LIGO/Virgo G211117: HAWC follow-up of northern sky
  2. Trigger 677981: Swift detection of IGRJ17091-3624
  3. GRB 160303A: X-shooter spectroscopy
  4. Swift trigger 677890 is noise
  5. GRB 160303A: Continued optical monitoring from NOT
  6. GRB 160303A: JCMT SCUBA-2 sub-mm observation
  7. GRB160303A: further GROND observations
  8. GRB 160303A: 9.8 GHz VLA upper limit
  9. GRB 160303A, Swift-BAT refined analysis
  10. GRB 160303A: MMT Optical Detection
  11. GRB 160303A: Continued RATIR Optical and NIR Observations
  12. LIGO/Virgo G211117: GRAWITA LBT follow-up of PS15dpn
  13. GRB 160303A: GROND Optical Detection
  14. GRB 160303A: Observations from T150 OSN
  15. GRB 160303A: VLT/FORS2 afterglow obervations
  16. GRB 160303A: BOAO R-band Detection
  17. GRB 160303A: McDonald 2.1m CQUEAN Detection
  18. GRB 160303A SMA observation
  19. GRB 160303A iTelescope observation
  20. GRB 160303A: Swift-XRT refined Analysis
  21. GRB 160303A: Optical observations from the NOT
  22. Swift possibly triggered on IGR17091-3624
  23. GRB 160303A: Swift/UVOT Detection
  24. GRB 160303A: RAPTOR Observations During Gamma-Ray Emitting Interval
  25. GRB 160303A: RATIR Optical and NIR Afterglow Detection
  26. GRB 160303A: MITSuME Akeno optical upper limits
  27. GRB 160303A: LCOGT-FTN optical observations
  28. GRB 160303A: MITSuME Okayama upper limits
  29. GRB 160303A: ISON-NM early optical early limits
  30. GRB 160303A: Swift detection of a burst, possibly short
  31. GRB 160227A: LOAO 1.0m optical detection
  32. GRB 160227A: McDonald 0.8m Detection
  33. GRB 160228A: Swift/UVOT Upper Limits
  34. GRB 160227A: Swift/UVOT Detection
  35. GRB160228A: Further analyses on spectral lag and extended emission
  36. GRB 160228A: Mondy optcial observations
  37. GRB 160228A: RATIR Optical and NIR Observations
  38. GRB 160228A: MASTER-Amur prompt observations
  39. GRB 160228A: Swift-XRT refined Analysis
  40. GRB 160227A: MASTER prompt OT Detection and LC
  41. GRB 160227A: AROMA-N Optical Observation
  42. GRB 160228A: GROND Afterglow Candidate
  43. GRB 160228A: Swift-BAT refined analysis
  44. GRB 160228A: optical observations
  45. GRB 160227B: Fermi GBM detection
  46. GRB 160227A: NOT redshift
  47. GRB 160228A: Swift detection of a burst
  48. GRB 160227A, Swift-BAT refined analysis
  49. GRB 160227A: Swift-XRT refined Analysis
  50. GRB 160227A: MAXI/GSC detection
  51. GRB 160225A: TSHAO optical afterglow detection
  52. GRB 160227A: ISON-Kislovodsk optical observation
  53. GRB 160227A: Mt. Terskol observatory optical observation
  54. GRB 160227A: MASTER OT Detection
  55. GRB 160227A: Swift detection of a burst with an optical counterpart
  56. GRB 160225A: LOAO optical upper limit
  57. GRB 160225B: Fermi GBM detection
  58. IPN Triangulation of GRB 160225B
  59. GRB 160225A: Continued RATIR Optical and NIR Observations
  60. GRB 160225.81/FERMI Trigg 478121069: MASTER OT J095503.19-355149.4 detection
  61. GRB 160225A: Swift-BAT refined analysis
  62. Fermi GBM trigger 478156376/16022621 is not a GRB
  63. GRB 160225A: MASTER-Amur observations
  64. GRB 160225A: RATIR Optical and NIR Observations
  65. GRB 160225A: Swift/UVOT Upper Limits
  66. GRB 160225A: Xinglong TNT optical observation
  67. GRB 160223B: CALET Gamma-Ray Burst Monitor detection
  68. GRB 160225A: Swift-XRT refined Analysis
  69. GRB 160225A: NOT optical observations
  70. GRB 160225A: WHT LIRIS observations
  71. GRB 160225A: MITSuME Okayama Optical Observation
  72. GRB 160225A: MITSuME Akeno Optical Observation
  73. GRB 160223A: RATIR Optical and NIR Observations
  74. GRB 160225A: TSHAO optical upper limit
  75. GRB 160225A: MASTER-Amur early observations
  76. GRB 160225A: Swift detection of a burst
  77. GRB 160223A: Swift-XRT afterglow detection
  78. GRB 160221A: Swift-XRT afterglow detection
  79. GRB 160223A: AbAO optical observations
  80. Konus-Wind observation of GRB 160219A
  81. GRB 160223B: MASTER-Amur early observations
  82. Fermi GBM trigger 477460274/160218161 is not a GRB
  83. Fermi GBM trigger 477985003/160224234 is not a GRB
  84. GRB 160223A: Swift-BAT refined analysis
  85. GRB 160223B: Khureltogot optical observations
  86. GRB 160223A: Fermi GBM observation
  87. GRB 160223B: Swift-XRT observations
  88. GRB 160223B: LCOGT-FTN optical observations
  89. GRB 160223B: Fermi GBM observation
  90. GRB 160223B: Swift ToO observations
  91. GRB 160223B: A long GRB detected by INTEGRAL
  92. GRB 160223A: GROND optical/NIR afterglow
  93. GRB 160223A: Swift detection of a burst
  94. GRB 160221A: Fermi GBM observation
  95. LVC GW 150914: TAROT/TZAC Final analysis correction
  96. GRB 160221A: GROND upper limits
  97. Correction to the title of Swift GCN 19051
  98. GRB 160220B: Further GROND Observations
  99. Further Swift/UVOT observations of GRB 160220B
  100. GRB 160221A: Swift-XRT observations

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