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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"

5548 results found.

  1. Fermi trigger 574140965 / GRB190313.15: MASTER Global Robotic Net optical observation
  2. GRB190305A: MASTER Global Robotic Net optical observation
  3. GRB190219A: MASTER Global Robotic Net optical observation
  4. Trigger 889483: Swift detection of Swift J1858.6-0814
  5. Trigger 888312: Swift detection of 4U 1901+03
  6. GRB 190203A: COATLI Optical Observations
  7. GRB 190204A: Swift detection of a burst with a possible optical counterpart
  8. GRB 190203A: Swift detection of a burst with an optical counterpart
  9. GRB 190202A: Swift/UVOT Detection
  10. GRB 190202A: Koshka Zeiss-1000 optical observations
  11. GRB 190202A: Swift detection of a burst with an optical counterpart
  12. GRB 190129B: MASTER Global Robotic Net optical observation
  13. GRB 190129A: MAXI/GSC detection
  14. Trigger 886486: Swift detection of MAXI J1631-479
  15. Trigger 886266: Another Swift trigger on MAXI J1348-630
  16. Swift Trigger 886157: Swift detection of a new transient Swift J1728.9-3613
  17. INTEGRAL triggers from 8205 to 8211 are due to MAXI J1348-630, NOT to a GRB
  18. Swift Trigger 885960: A third Swift trigger on MAXI J1348-630
  19. Trigger 885845: A second Swift trigger on MAXI J1348-630
  20. GRB 190123A: IKI-GRB-FuN optical upper limit
  21. Trigger 884906: Swift detection of MAXI J1631-479
  22. GRB 190114A: Swift detection of a burst
  23. GRB 190109B: Fermi GBM observation
  24. GRB 190109A: Fermi GBM observation
  25. GRB 190109B: COATLI Optical Observations
  26. GRB 190109B: Mondy optical upper limit
  27. INTEGRAL Weak#8189: AROMA-N Optical Observation
  28. GRB 190109B: Swift detection of a burst
  29. GRB 190109A: Swift detection of a burst
  30. GRB 190103B: Swift detection of a burst
  31. GRB 181228A: MITSuME Akeno optical upper limits
  32. GRB 181228A: Global MASTER Net OT detection
  33. GRB 181222B: Global MASTER Net observations of short bright Fermi GRB
  34. GRB 181222B: Global MASTER Net observations of the short bright Fermi GRB error box.
  35. Swift Trigger 878504 is not astrophysical
  36. GRB 181222A: MAXI/GSC detection
  37. GRB 181126B: KAIT Follow-Up Observations of a Fermi Short GRB (Trigger 564897175)
  38. MASTER: OTs detection during Fermi alert trigger 565936249 early observations
  39. GRB 181126B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 564897175)
  40. GRB 181201A: continued optical observations in SAAO and Chilesope
  41. GRB 181202A: Global MASTER-Net optical observations
  42. GRB 181201A: NOT optical observations
  43. Short-duration GRB 181121.4: MASTER-Tavrida possible OT detection near the PGC galaxy during large Fermi error box inspection
  44. GRB 181126A: Fermi GBM observation
  45. GRB 181126A: Prompt enhanced Swift-XRT position
  46. GRB 181126A: Swift detection of a burst
  47. GRB 181123B: Global MASTER Net optical inspection
  48. GRB 181110A: Swift/UVOT Detection
  49. GRB 181110A: optical observations from iTelescope SSO
  50. GRB 181110A: MITSuME Akeno optical observation
  51. GRB 181110A: Swift detection of a burst with an optical counterpart
  52. GRB 181028A: Insight-HXMT/HE detection
  53. GRB 181028A: CALET Gamma-Ray Burst Monitor detection
  54. Konus-Wind observation of GRB 181028A
  55. GRB 181030A: SAO RAS optical observations
  56. GRB 181030A: Swift detection of a burst with a possible optical counterpart
  57. IPN Triangulation of GRB 181028A (long)
  58. GRB 181028A: Fermi GBM observation
  59. GRB 181028A: Fermi-LAT detection
  60. IceCube-181023A: HAWC follow-up
  61. Search for counterparts to IceCube-181023A with IceCube
  62. GRB 181022A: MITSuME Akeno optical upper limits
  63. Baksan Neutrino BNO 181021: Global MASTER-net Optical Follow-up Observations
  64. GRB 181020A: Swift detection of a burst with an optical counterpart
  65. GRB 181016A: Swift detection of a burst
  66. Search for counterparts to IceCube-181014A with IceCube
  67. GRB 181011A: MAXI/GSC detection
  68. GRB180913A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 558557292)
  69. GRB 181008B: Global MASTER Net optical inspection
  70. GRB 180930A: TSHAO optical upper limit
  71. INTEGRAL detections of the prompt gamma-ray emission of GRB 180914B
  72. GRB 180925A: Insight-HXMT/HE detection
  73. GRB 180925A: Swift detection of a burst
  74. GRB 180924A: MASTER inspection
  75. GRB 180924A: Swift detection of a burst
  76. GRB 180923A: MASTER inspection MAXI/GSC error box
  77. GRB 180923A: MAXI/GSC detection
  78. GRB 180914B: DDOTI/OAN Detection and Confirmation of Fading
  79. GRB 180914B: GOTO optical detection
  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. GRB 180914B: AGILE/MCAL refined analysis
  85. GRB180914B: Swift UVOT detection of an optical afterglow
  86. GRB 180914B: RATIR Optical and NIR Observations
  87. GRB 180914B: KAIT Optical Afterglow Candidate
  88. GRB 180914A: RATIR Optical and NIR Observations
  89. GRB 180914A: MASTER automatic inspection
  90. GRB 180914B: AGILE/MCAL detection of a burst
  91. Fermi-LAT Gamma-ray Observations of IceCube-180908A
  92. INTEGRAL observation of IceCube-180908A
  93. Search for counterparts to IceCube-180908A with IceCube
  94. IceCube-180908A: HAWC follow-up
  95. IceCube-180908A - IceCube observation of a high-energy neutrino candidate event
  96. GRB 180905A: RATIR Optical and NIR Observations
  97. GRB 180905A: MITSuME Akeno optical upper limits
  98. GRB 180904A: AbAO optical upper limit
  99. GRB 180904A: RATIR Optical and NIR Observations
  100. GRB 180905A: Swift detection of a burst

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