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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"

37680 results found.

  1. Swift detection of a dust-scattered halo around GRB 160623A
  2. GRB 160623A: Swift-XRT afterglow detection
  3. GROND observations of GRB 160622A/SNR RCW 103/SGR 1617-5103
  4. GRB 160623A: Fermi GBM detection/observation
  5. Konus-Wind observation of GRB 160623A
  6. GRB 160623A / Galactic transient: Fermi-LAT detection
  7. GRB 160623A: Swift ToO observations
  8. Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
  9. Fermi GBM Trigger 160622573 is not a GRB
  10. BAT trigger 700791 (possible GRB 160622A) is SNR RCW 103
  11. GRB 160622A: Swift detection of a possible short GRB or a new SGR
  12. More FERMI GBM bursts from the magnetar SGR 1935+2154
  13. Fermi GBM trigger 488128598/160620637 is not a GRB
  14. Fermi GBM trigger 487974449/160618852 is not a GRB
  15. Konus-Wind observation of GRB 160612A
  16. GRB 160612A: Swift-XRT observations
  17. BAT detection and localization of GRB 160612A
  18. GRB 160612A: Swift ToO observations
  19. IPN Triangulation of GRB 160612A (short/hard)
  20. GRB 160521A: 15 GHz detections and upper limit from AMI
  21. GRB 160519A: 15 GHz upper limits from AMI
  22. GRB 160509A: 15 GHz upper limits from AMI
  23. GRB 160612A: Fermi GBM detection
  24. GRB 160611A: Swift/UVOT observations
  25. GRB 160611A: Swift-BAT refined analysis
  26. GRB 160611A: Swift-XRT refined Analysis
  27. GRB 160611A: GCN19525 OT is known star
  28. GRB 160611A: Enhanced Swift-XRT position
  29. GRB 160611A: Swift-XRT observations
  30. GRB 160611A: Swift detection of a burst
  31. GRB 160525C: Astrosat CZTI detection
  32. GRB 160508A: Astrosat CZTI detection
  33. GRB 160607A CALET Gamma-Ray Burst Monitor detection
  34. GRB 160607A: Swift/UVOT Upper Limits
  35. GRB 160607A: GROND confirmation of the afterglow
  36. Konus-Wind observation of GRB 160607A
  37. GRB 160504A: 15 GHz upper limits from AMI
  38. GRB 160417A: 15 GHz upper limits from AMI
  39. GRB 160408A: 15 GHz upper limits from AMI
  40. GRB 160607A: candidate optical afterglow from the NOT
  41. GRB 160607A: Swift-BAT refined analysis
  42. GRB 160607A: Swift-XRT refined Analysis
  43. GRB 160607A: Enhanced Swift-XRT position
  44. GRB 160607A: Swift detection of a bright burst
  45. GRB 160530A: further Swift-XRT follow-up observations
  46. Fermi GBM trigger 486907024/160606498 is not a GRB
  47. GRB 160601A: AbAO optical observations
  48. GRB 160601A: Discovery Channel Telescope Limits
  49. GRB 160601A: Swift/UVOT Upper Limits
  50. GRB 160601A: MITSuME Akeno optical upper limits
  51. GRB 160601A: Swift-BAT refined analysis
  52. Fermi GBM trigger 486562774/160602514 is not a GRB
  53. GRB 160601A: GTC observations confirming transient source decay
  54. GRB 160601A: Mondy optical observations, photometry of NOT sources
  55. GRB160601A: Kanata Telescope I- and Ks-bands upper limits
  56. GRB160601A: NOT afterglow confirmation
  57. GRB 160530B CALET Gamma-Ray Burst Monitor detection
  58. GRB 160601A: Swift-XRT refined Analysis
  59. GRB160601A: NOT detection of an afterglow candidate
  60. GRB 160601A: Enhanced Swift-XRT position
  61. GRB 160601A: Mondy optical observations
  62. GRB 160601A: MITSuME Okayama Ks-band upper-limit
  63. GRB 160530A: Swift follow-up and X-ray afterglow candidate
  64. GRB 160601A: MITSuME Okayama upper limits
  65. GRB 160601A: MASTER-Net observations
  66. GRB 160601A: Swift detection of a short hard burst
  67. Konus-Wind observation of GRB 160530A
  68. IPN Triangulation of GRB 160530A
  69. GRB 160525B: MITSuME Akeno optical upper limits
  70. GRB 160530B: Fermi GBM Detection
  71. GRB 160530A: discovery with the Compton Spectrometer and Imager
  72. GRB 160530A: Tiled Swift observations
  73. GRB 160525C: CALET Gamma-Ray Burst Monitor detection
  74. GRB 160525B: Mondy optical upper limit
  75. GRB 160525B: Khureltogot optical upper limit
  76. GRB 160525B: Swift-BAT refined analysis
  77. GRB 160525B: Swift-XRT refined Analysis
  78. GRB 160525B: Nanshan optical upper limit
  79. GRB 160525B: Swift/UVOT Detection
  80. GRB 160521B: Swift-XRT afterglow detection
  81. GRB 160525B: Enhanced Swift-XRT position
  82. Konus-Wind observation of GRB 160521B
  83. GRB 160525A: Swift-BAT refined analysis
  84. GRB 160525B: Prompt enhanced Swift-XRT position
  85. GRB 160525B: Swift detection of a burst
  86. GRB 160525A: Swift detection of a probable burst
  87. Correction - Fermi/GBM trigger 160523919 is a GRB
  88. GRB 160521B: Theoretical estimate of the redshift and urgent need for further x-ray observations
  89. The nature of the Fermi/GBM trigger 160523919 is unknown.
  90. GRB 160425A: SMARTS late-time observations
  91. GRB 160327A: 15 GHz upper limits from AMI
  92. GRB 160321A: 15 GHz upper limits from AMI
  93. GRB 160314A: 15 GHz upper limits from AMI
  94. GRB 160313A: 15 GHz upper limits from AMI
  95. GRB 160521B: Swift/UVOT Upper Limits
  96. GRB 160521B: Swift-XRT observations
  97. GRB 160521B: Swift ToO observations
  98. GRB 160521B: Fermi-LAT detection
  99. GRB 160521B: Fermi GBM detection
  100. GRB 160521A: a long GRB detected by INTEGRAL

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