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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"

12402 results found.

  1. GRB170104.78 MASTER-Net OT detection
  2. LIGO/Virgo G268556: INTEGRAL search of temporally coincident prompt hard X-ray emission
  3. LIGO/Virgo G268556: Fermi GBM Observations
  4. GRB 161214B: MASTER-Kislovodsk early optical observations
  5. GRB 161214A: MASTER-IAC early optical observations
  6. GRB 161224A: Swift/UVOT Upper limits
  7. GRB161219.78 MASTER-Net OT detection
  8. GRB 161214B: optical spectroscopy of the foreground SDSS object
  9. GRB 161202A: 15 GHz upper limits from AMI
  10. GRB 161129A: 15 GHz upper limits from AMI
  11. GRB 161220A: GROND Upper Limits
  12. GRB 161220A: Swift/UVOT Upper Limits
  13. GRB 161220A: Swift detection of a burst
  14. Swift Trigger 727422 is not an astrophysical event.
  15. GRB 161217A: MITSuME Okayama upper limits
  16. GRB 161217A: Swift/UVOT Upper Limits
  17. Fermi-LAT Gamma-ray Observations of IceCube-161210
  18. IceCube-161210: Konus-Wind upper limits
  19. IceCube-161210: CALET Gamma-Ray Burst Monitor upper limits
  20. HAWC follow-up on IceCube-161210
  21. INTEGRAL SPI-ACS and IBIS/Veto observation of IceCube-161210
  22. IceCube-161210: MAXI/GSC non-detection
  23. GRB 161129A: KWFC z-band photometry
  24. Konus-Wind observation of GRB 161202A
  25. GRB 161202A: RATIR Optical and NIR Observations
  26. GRB 161202A: Swift/UVOT Upper Limits
  27. GRB 161202A: MITSuME Okayama upper limits
  28. GRB 161202A: Swift detection of a burst
  29. GRB 161129A: MITSuME Okayama Optical Observation
  30. GRB 161129A: Swift/UVOT Detection
  31. GRB 161123A: Swift-XRT observations
  32. GRB 161123A: MAXI/GSC detection
  33. GRB 161119A: MASTER-SAAO possible OT detection during Fermi Alert
  34. GRB 161108A: 15 GHz upper limits from AMI
  35. Swift Trigger 723124 is probably not a GRB
  36. Konus-Wind observation of GRB 161117A
  37. GRB 161117A iTelescope observation
  38. GRB 161117A: MASTER-OAFA (Argentina) prompt OT observations
  39. GRB 161117B: Swift/UVOT Upper Limits
  40. GRB 161117A: Swift/UVOT Detection
  41. Swift Trigger 722681 is probably not a GRB
  42. GRB 161117B: Swift detection of a burst
  43. GRB 161113A: Swift/UVOT Upper Limits
  44. GRB 161113A: Kuban State University optical upper limit
  45. GRB 161113A: RATIR Optical and NIR Observations
  46. GRB 161113A: Swift detection of a burst
  47. GRB 161109A: Swift/UVOT Upper Limits
  48. GRB 161109A: Swift-XRT observations
  49. GRB 161108A: MITSuME Okayama upper limits
  50. IceCube-161103: CALET Gamma-Ray Burst Monitor upper limits
  51. GRB 161108A: Swift/UVOT Upper Limits
  52. GRB 161105A: Swift/UVOT Upper Limits
  53. GRB 161108A: RATIR Afterglow Confirmation
  54. GRB 161108A: Swift detection of a burst
  55. Fermi LAT Gamma-ray Observations of IceCube-161103
  56. GRB 161022A: 15 GHz upper limits from AMI
  57. GRB 161017A: 15 GHz upper limits from AMI
  58. IceCube-161103: Konus-Wind upper limits
  59. Search for counterpart to IceCube-161103A with ANTARES
  60. GRB 161105A: MASTER-IAC early optical observations
  61. GRB 161105A: Swift detection of a burst
  62. GRB 161104A: Swift/UVOT Upper Limits
  63. Fermi GBM Observations of IceCube-161103
  64. IceCube-161103: Swift-XRT observations
  65. INTEGRAL SPI-ACS and IBIS/Veto observation of IceCube-161103
  66. IceCube-161103: MASTER follow-up observations
  67. HAWC follow up of IceCube-161103
  68. GRB 161015A: 15 GHz upper limits from AMI
  69. GRB 161014A: 15 GHz upper limits from AMI
  70. Radio upper limit on the GRB 161011A with the GMRT
  71. GRB 161023A (Integral trigger 7613) MASTER-Net bright OT detection
  72. Swift Trigger 718919 is not an astrophysical event.
  73. GRB 161022A: RATIR Optical and NIR Observations
  74. GRB 161022A: Swift/UVOT Upper Limits
  75. GRB 161011A: 15 GHz upper limits from AMI
  76. GRB 161007A: 15 GHz upper limits from AMI
  77. GRB 161017A: Lomonosov Gamma Ray and MASTER Optical prompt observations
  78. GRB 161014A: Continued RATIR Optical and NIR Observations
  79. GRB 161015A: Swift/UVOT observations
  80. GRB161017.74 MASTER-Net OT detection
  81. Konus-Wind observation of GRB 161015A
  82. Konus-Wind observation of GRB 161014A
  83. GRB 161014A: RATIR Optical and NIR Observations
  84. GRB 161014A: AROMA-N Optical Observation
  85. GRB 161011A: RATIR Optical and NIR Observations
  86. GRB 161014A: Kanata optical observation
  87. GRB 161011A: Swift/UVOT Upper Limits
  88. GRB 161011A: Swift detection of a burst
  89. GRB 161007A: Swift/UVOT Upper Limits
  90. GRB 161007A: MASTER-net early optical observations
  91. GRB 161007A: Swift detection of a burst
  92. Konus-Wind observation of GRB 161004B
  93. GRB 161001A: IRSF upper limits
  94. GRB 161004B: Swift/UVOT Upper Limits
  95. GRB 161004A: RATIR Optical and NIR Observations
  96. GRB 161004B: Swift detection of a burst
  97. GRB 161004A: SAO RAS optical upper limit
  98. GRB 161004A: Swift/UVOT Detection
  99. GRB 161004A: Bassano Bresciano Observatory upper limit
  100. GRB 160927A: 15 GHz upper limits from AMI

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