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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"

27270 results found.

  1. GRB 171020A: Swift/UVOT Upper Limits
  2. GRB 171020A: NOT spectroscopic redshift
  3. GRB 171020A: Swift-BAT refined analysis
  4. GRB 171020A: RATIR Optical and NIR Observations
  5. GRB 171020A: Swift-XRT refined Analysis
  6. GRB 171020A: LT observations
  7. GRB 171020A: Confirmation of OT fading
  8. GRB 171020A: Mini-MegaTORTORA upper limits on simultaneous optical emission
  9. GRB 171020A: NOT optical afterglow detection
  10. GRB 171020A: Swift detection of a burst
  11. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  12. GRB 171011B: Insight-HXMT detection
  13. Trigger 780207: Swift triggers again on AXP CXOU J164710.2-455216/PSR J1647-4552
  14. Swift Trigger on AXP CXOU J164710.2-455216/PSR J1647-4552
  15. GRB 171011B CALET Gamma-Ray Burst Monitor detection
  16. Trigger 779762: Swift detection of Vela X-1
  17. Trigger 779351: Swift detection of Swift J0243.6+6124
  18. Swift trigger 779171 is probably a noise fluctuation
  19. GRB 171010A: RATIR Optical and NIR Observations
  20. BAT trigger 778435 is not a GRB.
  21. GRB 171013A: TAROT Calern observatory optical observations
  22. GRB 171013A: Swift detection of a possible burst
  23. GRB 171011A: Swift-BAT refined analysis
  24. GRB 171010A: Swift/UVOT Detection
  25. GRB 171010A: NOT optical observations
  26. GRB 171010B: Fermi GBM detection
  27. GRB 171011A: TAROT Calern observatory optical observations
  28. GRB 171010B: Swift detection of a burst
  29. GRB 171011A: MASTER-SAAO optical observations
  30. GRB 171011A: Swift detection of a burst
  31. GRB 171010A: Fermi GBM observation
  32. GRB 171010A: LCO 1m telescope observations
  33. GRB171010A: AstroSat CZTI detection
  34. GRB 171010A: optical observations
  35. GRB 171010A: Fermi-LAT detection
  36. GRB 171007A: Swift/UVOT Upper Limits
  37. GRB 171007A: Swift-BAT refined analysis
  38. GRB 171007A: Fermi GBM observation
  39. GRB 171007A: Swift-XRT refined Analysis
  40. GRB 171007A: RATIR Optical and NIR Observations
  41. GRB 171007A: Swift detection of a burst
  42. GRB 171004A: Swift/UVOT Upper Limits
  43. GRB 171004A: Swift-BAT refined analysis
  44. GRB 171004A: Swift-XRT refined Analysis
  45. GRB 171004A: RATIR Optical and NIR Observations
  46. GRB 171004A: Swift detection of a burst
  47. Swift Trigger 775946 is a Galactic transient, not GRB 171003
  48. LIGO/Virgo G299232: LOFAR follow-up
  49. GRB 171003A: LT early optical observations
  50. GRB 171003A: Swift detection of a burst or a Galactic Transient
  51. GRB 171001A: RATIR Optical and NIR Observations
  52. GRB 171001A: Swift-BAT refined analysis
  53. GRB 171001A: Nanshan-0.36m optical afterglow detections
  54. GRB 171001A: Swift-XRT refined Analysis
  55. GRB 171001A: Swift/UVOT Detection
  56. GRB171001A: D50 optical limit
  57. GRB 171001A: Swift detection of a burst
  58. LIGO/VIRGO G299232: AMI-LA Observations of the optical transient Swift J014008.5+343403.6
  59. Fermi Gamma-ray Burst Monitor trigger 528508320/170930994 is not a GRB
  60. Fermi Gamma-ray Burst Monitor trigger 528330888/170929011 is not a GRB
  61. 3.6m Devasthal Optical Telescope observations of GRB 170428A
  62. Further Swift-XRT observations of IceCube 170922A
  63. Fermi-GBM GRB misclassifications
  64. LIGO/VIRGO G298048: VLA detection of the radio counterpart at 6 GHz
  65. GRB 170728B: Kottamia R-band observation
  66. IceCube-170922A: Swift-XRT observations
  67. LIGO/VIRGO G298048: Latest 3 GHz Detection of Radio Counterpart to SSS17a
  68. GRB 170921B: AstroSat CZTI detection
  69. GRB 170906A: Insight-HXMT detection
  70. GRB 170921C: Insight-HXMT detection
  71. IPN Triangulation of GRB 170921B
  72. GRB 170921A: RATIR Optical Afterglow Detection and NIR Observations
  73. GRB 170921A: Swift/UVOT Upper Limits
  74. GRB 170921A: Swift-BAT refined analysis
  75. GRB 170918A: Insight-HXMT detection
  76. GRB 170921A: LCO 2m telescope observations
  77. LIGO/Virgo G298048: LCO FLOYDS and Gemini Spectroscopy
  78. GRB 170921A: Swift-XRT refined Analysis
  79. GRB 170921A: TAROT Calern observatory optical observations
  80. GRB 170921B: Fermi GBM detection
  81. GRB 170921A: Swift detection of a burst
  82. LIGO/Virgo G298048: SSS17a photometry of CHILESCOPE observatory
  83. Swift trigger 773082 is probably not astrophysical
  84. LIGO/Virgo G298048: TOROS photometry of SSS17a
  85. LIGO/Virgo G298048: Desert Fireball Network simultaneous optical observations of the SSS17a/DLT17ck.
  86. Fermi-GBM GRB misclassifications
  87. GRB 170912C: Insight-HXMT detection
  88. LIGO/Virgo G297595: NIR Observations following GW170814
  89. LIGO/Virgo G297595: PIRATE observations
  90. Fermi GBM trigger 527149931/170915272 is not a GRB
  91. GRB 170906A CALET Gamma-Ray Burst Monitor detection
  92. GRB 170912B: Swift/UVOT Upper Limits
  93. Fermi GBM trigger 526978609/170913289 is not a GRB
  94. GRB 170912B: Swift-BAT refined analysis
  95. LIGO/Virgo G297595: DLT40 follow-up observation
  96. GRB 170912A: Swift-BAT refined analysis
  97. GRB 170912A: Swift-XRT refined Analysis
  98. LIGO/Virgo G299232: Khureltogot observations
  99. GRB 170912A: Swift/UVOT Upper-Limits
  100. GRB 170912B: Swift-XRT refined Analysis

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