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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"

19666 results found.

  1. GROND observations of GRB 171027A
  2. GRB 171027A: MASTER-OAFA (Argentina) early prompt optical observations
  3. GRB 171027A: Prompt enhanced Swift-XRT position
  4. GRB 171027A: Swift detection of a burst
  5. Swift trigger 781740: Further analysis from Swift and Fermi/GBM
  6. Numerous Fermi-GBM Subthreshold Notices are due to Swift J0243.6+6
  7. GRB 171022A: Fermi-LAT detection
  8. Swift Trigger 781740 is not a burst
  9. GRB 171020A: TAROT Calern observatory optical observations
  10. GRB 171020A: Swift/UVOT Upper Limits
  11. GRB 171020A: Swift-BAT refined analysis
  12. GRB 171020A: Swift-XRT refined Analysis
  13. GRB 171020A: Enhanced Swift-XRT position
  14. GRB 171020A: LT observations
  15. GRB 171020A: Mini-MegaTORTORA upper limits on simultaneous optical emission
  16. GRB 171020A: Swift detection of a burst
  17. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  18. Trigger 780207: Swift triggers again on AXP CXOU J164710.2-455216/PSR J1647-4552
  19. Swift Trigger on AXP CXOU J164710.2-455216/PSR J1647-4552
  20. GRB 171010B: Swift-XRT afterglow detection
  21. Trigger 779762: Swift detection of Vela X-1
  22. Trigger 779351: Swift detection of Swift J0243.6+6124
  23. Swift trigger 779171 is probably a noise fluctuation
  24. GRB 171010A: VLA Detection
  25. BAT trigger 778435 is not a GRB.
  26. GRB 171010B: Swift-XRT observations
  27. GRB 171013A: TAROT Calern observatory optical observations
  28. GRB 171013A: Swift detection of a possible burst
  29. GRB 171011A: Swift-BAT refined analysis
  30. GRB 171010A: Swift/UVOT Detection
  31. GRB 171010B: Fermi GBM detection
  32. IPN Triangulation of GRB 171011B (long/very bright)
  33. GRB 171010B: Swift ToO observations
  34. GRB 171011A: TAROT Calern observatory optical observations
  35. GRB 171010B: Swift detection of a burst
  36. GRB 171011A: MASTER-SAAO optical observations
  37. GRB 171011A: Swift detection of a burst
  38. GRB 171010A: Fermi GBM observation
  39. GRB 171010A: LCO 1m telescope observations
  40. GRB 171010A: Swift-XRT afterglow detection
  41. GRB 171010A: OT, spectrum, and possible host galaxy
  42. GRB 171010A: Swift ToO observations
  43. GRB 171010A: Fermi-LAT detection
  44. GRB 171007A: Swift/UVOT Upper Limits
  45. GRB 171007A: Swift-BAT refined analysis
  46. GRB 171007A: Fermi GBM observation
  47. GRB 171007A: Enhanced Swift-XRT position
  48. GRB 171007A: Swift-XRT refined Analysis
  49. GRB 171007A: RATIR Optical and NIR Observations
  50. GRB 171007A: Swift detection of a burst
  51. GRB 171004A: Swift/UVOT Upper Limits
  52. GRB 171004A: Swift-BAT refined analysis
  53. GRB 171004A: Swift-XRT refined Analysis
  54. GRB 171004A: Enhanced Swift-XRT position
  55. LIGO/Virgo G299232: SWASP optical imaging coverage
  56. GRB 171004A: RATIR Optical and NIR Observations
  57. GRB 171004A: Swift detection of a burst
  58. GRB 171003A: Enhanced Swift-XRT position
  59. LIGO/Virgo G299232: MAGIC Cherenkov Telescopes observations
  60. Swift Trigger 775946 is a Galactic transient, not GRB 171003
  61. LIGO/Virgo G299232: LOFAR follow-up
  62. GRB 171003A: LT early optical observations
  63. GRB 171003A: Swift detection of a burst or a Galactic Transient
  64. GRB 171001A: Swift-BAT refined analysis
  65. GRB 171001A: Swift-XRT refined Analysis
  66. GRB 171001A: Swift/UVOT Detection
  67. GRB171001A: D50 optical limit
  68. GRB 171001A: Enhanced Swift-XRT position
  69. GRB 170921A: 15 GHz upper limits from AMI
  70. GRB 170903A: 15 GHz upper limits from AMI
  71. GRB 170906C: 15 GHz upper limits from AMI
  72. GRB 170823A: 15 GHz upper limits from AMI
  73. GRB 170822A: 15 GHz upper limits from AMI
  74. GRB 171001A: Swift detection of a burst
  75. LIGO/VIRGO G299232: AMI-LA Observations of the optical transient Swift J014008.5+343403.6
  76. 3.6m Devasthal Optical Telescope observations of GRB 170428A
  77. Further Swift-XRT observations of IceCube 170922A
  78. LIGO/Virgo G299232/GW170825: serendipitous XMM-Newton slew observations
  79. LIGO/Virgo G298936/GW170823: serendipitous XMM-Newton slew observations
  80. IceCube-170922A: Swift-XRT observations
  81. Correction to GCN Circular 21919: GRB 170921C: Insight-HXMT detection
  82. GRB 170906A: Insight-HXMT detection
  83. IPN Triangulation of GRB 170921B
  84. GRB 170921A: RATIR Optical Afterglow Detection and NIR Observations
  85. GRB 170921A: Swift/UVOT Upper Limits
  86. GRB 170921A: Swift-BAT refined analysis
  87. GRB 170921A: LCO 2m telescope observations
  88. GRB 170921A: Enhanced Swift-XRT position
  89. GRB 170921A: Swift-XRT refined Analysis
  90. GRB 170921A: TAROT Calern observatory optical observations
  91. GRB 170921A: Swift detection of a burst
  92. LIGO/Virgo G298048: ATCA monitoring of SSS17a in NGC 4993
  93. Swift trigger 773082 is probably not astrophysical
  94. LIGO/Virgo G298048: ATCA monitoring of SSS17a in NGC 4993
  95. GRB 170912B: Swift/UVOT Upper Limits
  96. GRB 170912B: Swift-BAT refined analysis
  97. GRB 170912A: Swift-BAT refined analysis
  98. GRB 170912A: Swift-XRT refined Analysis
  99. GRB 170912A: Swift/UVOT Upper-Limits
  100. GRB 170912B: Swift-XRT refined Analysis

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