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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"

21090 results found.

  1. GRB 181201A: VLT/FORS2 tentative spectroscopic redshift
  2. GRB 181201A: GROND detection of the afterglow and redshift upper limit of z < 3
  3. GRB 181201A: optical observations in Chilescope observatory
  4. GRB 181201A: Global MASTER-Net prompt optical descovery and afterglow observations
  5. GRB 181201A: Zeiss-1000/CrAO optical observations
  6. GRB 181201A: NOT optical observations
  7. GRB 181201A: optical observations in SAAO
  8. GRB 181201A MASTER-Net OT continued observation
  9. GRB 181201A: Swift-XRT afterglow detection
  10. GRB 181201A: Swift ToO observations
  11. GRB 181201A MASTER-Net OT detection
  12. GRB 181123B: ATCA 5/9 GHz rapid-response radio observation
  13. Short-duration GRB 181121.4: MASTER-Tavrida possible OT detection near the PGC galaxy during large Fermi error box inspection
  14. GRB 181123B: Keck further near-infrared imaging
  15. GRB 181126A: Swift/UVOT Upper Limits
  16. GRB 181126A deep Gemini imaging
  17. GRB 181123B: Global MASTER Net optical inspection
  18. GRB 181123B: Keck near-infrared imaging
  19. GRB 181123B: Gemini-North optical detection
  20. GRB 181123B: Swift/UVOT Upper Limits
  21. Swift Trigger 872470: further Swift analysis
  22. GRB 181110A: optical observations in Chilescope observatory
  23. GROND observations of GRB181110A
  24. GRB 181110A: Swift/UVOT Detection
  25. GRB 181110A: optical observations from iTelescope SSO
  26. Swift Trigger 871103 is not an astrophysical event
  27. Fermi GRB 181105.31: Global MASTER Net optical observations
  28. GRB 181103A: Swift/UVOT Detection
  29. GRB 181030A: Swift/UVOT Detection
  30. GRB 181030A: RATIR Optical and NIR Observations
  31. GRB 181030A: MASTER Net OT detection
  32. GRB 181030A: SAO RAS optical observations
  33. IceCube-181023A: MASTER Net optical alert and follow up observations
  34. GRB 180728B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 554505003)
  35. Fermi-LAT Gamma-ray Observations of IceCube-181023A
  36. GRB 181023A: Swift/UVOT Upper Limits
  37. GRB 181022A: GROND upper limits
  38. GRB 181022A: LCO Sutherland observations
  39. GRB 181023A: KAIT Optical Upper Limit
  40. GRB 181022A: Swift/UVOT Upper Limits
  41. GRB 181020A: REM detection
  42. Baksan Neutrino BNO 181021: Global MASTER-net Optical Follow-up Observations
  43. GRB 181020A: Swift/UVOT Detection
  44. GRB 181020A: Global MASTER Net OT observations
  45. GRB 181020A: LCO Cerro Tololo observations
  46. GRB 181020A: VLT/X-shooter spectroscopy and redshift
  47. Fermi-LAT Gamma-ray Observations of IceCube-181014A
  48. GRB 181013A: Swift/UVOT Upper Limits
  49. GRB 181013A: Swift-XRT afterglow detection
  50. GRB 181013A: Global MASTER Net optical observations
  51. GROND afterglow detection of GRB 181010A
  52. GRB180913A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 558557292)
  53. GRB 181010A: REM optical and NIR afterglow detection
  54. GRB 181008B: Global MASTER Net optical inspection
  55. GRB 181010A: ePESSTO NTT optical observations
  56. GRB 181010A: Swift/UVOT Detection
  57. GRB 181010A: RATIR Optical and NIR Afterglow Detection
  58. GRB 181010A: LCO Cerro Tololo observations
  59. GRB 181010A: MASTER-Argentina OT detection
  60. GRB 181003A: RATIR Optical and NIR Observations
  61. GRB 181003A: Swift-XRT afterglow detection
  62. GRB 181003A: Swift/UVOT Upper Limits
  63. GRB 181003A: LCO Cerro Tololo observations
  64. GRB 181003A: MASTER optical observation
  65. GRB181002A: GOTO optical limits
  66. GRB 181002A: Swift/UVOT Upper Limits
  67. GRB 181003A: Swift-XRT observations
  68. GRB 181002A: MASTER optical observation
  69. GRB 180914B: RTT150 optical observations
  70. GRB 180914B: RTT150 optical observations
  71. GRB 180930A: NOT optical upper limits
  72. GRB 180930A: Swift/UVOT Upper Limits
  73. GRB 180930A: KAIT Optical Upper Limit
  74. GRB 180924A: Swift/UVOT Upper Limits
  75. GRB 180925A: VLT optical observations
  76. GRB 180925A: Swift/UVOT Detection
  77. GRB 180924A: MASTER inspection
  78. GRB 180923A: MASTER inspection MAXI/GSC error box
  79. GRB 180914B: OAJ multi-color follow-up
  80. GRB 180914B : continued TSHAO optical observations
  81. GRB 180914B: MASTER OT automatic dtection
  82. GRB 180914B : TSHAO optical observations
  83. GRB 180914B: Continued RATIR Optical and NIR Observations
  84. GRB180914B: Swift UVOT detection of an optical afterglow
  85. GRB 180914B: RATIR Optical and NIR Observations
  86. GRB 180914B: KAIT Optical Afterglow Candidate
  87. GRB 180914B: Swift-XRT afterglow detection
  88. GRB 180914A: RATIR Optical and NIR Observations
  89. GRB 180914B: Tiled Swift observations
  90. GRB 180914A: MASTER automatic inspection
  91. GRB 180914A: Swift-XRT observations
  92. GRB 180914A: Tiled Swift observations
  93. Fermi-LAT Gamma-ray Observations of IceCube-180908A
  94. Search for counterparts to IceCube-180908A with IceCube
  95. GRB 180715A: 15 GHz upper limits from the AMI Short GRB Program
  96. GRB 180718A: 15 GHz upper limits from the AMI Short GRB Program
  97. GRB 180905A: Swift/UVOT Upper Limits
  98. GRB 180905A: RATIR Optical and NIR Observations
  99. GRB 180904A: BOOTES-2/TELMA early observations
  100. GRB 180905A: BOOTES-3/YA optical observations

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