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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

20540 results found.

  1. GMRT Radio detection of GRB 171205A
  2. GRB 171216A: Swift/UVOT Upper Limits
  3. GRB 171210A: Further Swift-XRT observations
  4. GRB 171205A: RATAN observations
  5. Swift Trigger 797070: KAIT Optical Observations
  6. Swift Trigger 797070 is probably not a GRB
  7. GRB 171205A: ALMA observations
  8. GRB 171212A/Swift J1935.7+2036: Swift/UVOT Upper Limits
  9. GRB 171212A/Swift J1935.7+2036: TSHAO optical observations
  10. GRB 171205A: JCMT SCUBA-2 sub-mm observations
  11. GRB 171211A: Swift/UVOT Upper Limits
  12. GRB 171210A: MASTER-Net optical observations
  13. GRB 171209A: MASTER-Net optical observations
  14. GRB 171210A: Swift-XRT and UVOT observations
  15. GRB 171210A: Swift ToO observations
  16. GRB 171209A: Lulin 1m telescope observations
  17. GRB 171205A: iTelescope optical observations
  18. GRB 171205A: Mondy optical observations
  19. GRB 171205A: SAO-RAS optical observations
  20. GMRT upper limit on GRB 171205A
  21. GRB 171209A: Swift/UVOT Analysis of the burst
  22. Swift Trigger 796115 is probably not a GRB
  23. GRB 171205A: VLA detection
  24. GRB 171205A: UKIRT near-IR observations
  25. GRB 171209A: LCO 1-m telescope observations
  26. Swift Trigger 796098 is probably a noise peak near M31
  27. LIGO/Virgo GW170817: X-ray observations confirm prediction made from radio data
  28. LIGO/Virgo GW170817: Further Hubble Space Telescope observations
  29. LIGO/Virgo G298048: Brightening X-ray Emission from GW170817/GRB170817A/SSS17a
  30. GRB 171205A: TSHAO optical observations
  31. LIGO/Virgo GW170817: Chandra X-ray brightening of the counterpart 108 days since merger
  32. GRB 171205A: Continued Swift/UVOT Observations
  33. LIGO/Virgo G298048: Late-time detection of the X-ray afterglow with Chandra
  34. GRB 171205A: MASTER-SAAO optical observations of unusual OT
  35. GRB 171205A: GROND observations of the optical/NIR transient
  36. GRB 171205A: LCO 1-m telescope observations
  37. GRB171205A hyperluminal radio afterglow?
  38. GRB 171205A: GMG observations (2nd night)
  39. GRB 171205A: Host galaxy photometric properties
  40. GRB 171205A: CHILESCOPE optical observations
  41. GRB 171205A: SMARTS optical/IR afterglow observations
  42. GRB 171205A: GOTO detection of the optical counterpart
  43. GRB 171205A: TNG NIR detections
  44. GRB 171205A: LSGT optical afterglow follow-up observation
  45. GRB 171205A: NOEMA detection of a bright mm afterglow
  46. GRB 171205A: GMG observation
  47. GRB 171205A: RATIR Optical and NIR Observations
  48. GRB 171205A: Swift/UVOT Detection
  49. GRB 171205A: VLT/X-shooter optical counterpart and spectroscopic observations
  50. GRB 171205A: Likely association with low-z spiral galaxy
  51. GRB 171124A: TShAO optical observations
  52. GRB 171124A: Swift-XRT afterglow detection
  53. Pan-STARRS follow-up of IceCube-171106A
  54. LIGO/Virgo G299232: LOFAR follow-up
  55. INTEGRAL pointed follow-up of IceCube-171106A
  56. GRB 171123A: OSN Upper Limit
  57. GRB 171124A: Swift-XRT observations
  58. GRB 171123A: Tautenburg observations
  59. GRB 171123A: RATIR Optical and NIR Observations
  60. GRB 171123A: Swift/UVOT Upper Limits
  61. GRB 171123A: GMG observation limit
  62. GRB 171124A: Swift ToO observations
  63. GRB 171123A: Confirmation of the X-ray afterglow
  64. GRB 171120A: Swift/UVOT Upper Limits
  65. Fermi-LAT Gamma-ray Observations of IceCube-171106A
  66. GRB 171115A: RATIR Optical and NIR Observations
  67. FACT follow-up of IceCube20171106
  68. IceCube-171106A: Swift Observations
  69. GRB 171010A: afterglow and SN 2017htp optical observations
  70. GRB 171030A: MASTER OT J034412.48-263556.5 featureless continuum spectrum from Lijiang 2.4m (China) telescope and 2m the Himalayan Chandra
  71. GRB 171010A: possible SN component
  72. AMON ICECUBE EHE 130214 (close by time to Fermi trigger): MASTER early follow-up observations
  73. GRB 171030A: MASTER inspection of the IPN error box of the short GRB.
  74. GRB 171010A: VLT spectroscopic identification of the associated SN 2017htp
  75. GRB 171102B: RATIR Optical and NIR Observations
  76. GRB 171102B: Swift/UVOT Upper Limits
  77. GRB 171030A: Swift non-localization with BAT, XRT and UVOT
  78. GRB 171030A: Swift ToO observations
  79. Swift Trigger 783893: KAIT Optical Observations
  80. GRB 171027A: KAIT Optical Upper Limit
  81. AMI-LA observations of the new Be X-ray binary Swift J0243.6+6124
  82. Swift Trigger 783893: LCO 1-m telescope observations
  83. GRB 171027A: Swift/UVOT Upper Limits
  84. GRB 171027A: VLT optical upper limits
  85. GRB 171027A: LCO 1-m telescope observations
  86. GROND observations of GRB 171027A: correction
  87. GRB 171027A: RATIR Detection of a NIR Afterglow Candidate
  88. GROND observations of GRB 171027A
  89. GRB 171027A: MASTER-OAFA (Argentina) early prompt optical observations
  90. Swift trigger 781740: Further analysis from Swift and Fermi/GBM
  91. Swift Trigger 781740 is not a burst
  92. Fermi GBM Observations of IceCube-171015A
  93. GRB 171020A: Continued RATIR Optical and NIR Observation
  94. GRB 171020A: TAROT Calern observatory optical observations
  95. GRB 171020A: Swift/UVOT Upper Limits
  96. GRB 171020A: RATIR Optical and NIR Observations
  97. GRB 171020A: LT observations
  98. GRB 171020A: NOT optical afterglow detection
  99. Swift Trigger on AXP CXOU J164710.2-455216/PSR J1647-4552
  100. GRB 171010B: Swift-XRT afterglow detection

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