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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"

3119 results found.

  1. LIGO/Virgo S190412m: SVOM/GWAC observations of the initial skymap
  2. Fermi GRB190419.41 Global MASTER-Net observations report
  3. GRB 190406B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 576241792)
  4. GRB 190404C: MITSuME Akeno and Okayama optical upper limits
  5. GRB190404C: GROWTH-India discovery of optical counterpart
  6. GRB 140404B: MAXI/GSC detection
  7. GRB 190330A: MITSuME Akeno and Okayama optical upper limits
  8. GRB 190331A: Fermi GBM detection
  9. MAGIC follow-up of the X-ray flares of LS I +61�303 dete
  10. GRB 190324A: Swift/UVOT Observations
  11. GRB 190326A: Swift detection of a short burst
  12. GRB 190324A: Swift/UVOT afterglow candidate
  13. Swift detection of LS I +61 303
  14. Trigger 890732: Swift detection of MAXI J1631-479
  15. IceCube-190221A: MASTER Global Robotic Net optical observation
  16. Trigger 888312: Swift detection of 4U 1901+03
  17. GRB 190204A: Swift detection of a burst with a possible optical counterpart
  18. GRB 190202A: SAO RAS optical observations
  19. GRB 190129A: MAXI/GSC detection
  20. Swift Trigger 886157: MASTER optical observation
  21. IPN Triangulation of GRB 190117A (long)
  22. GRB 190114C: UKIRT JHK observation (CORRECTIONS)
  23. GRB 190114C: Continued UKIRT JHK observation
  24. GRB 190114C: UKIRT JHK observation
  25. GRB 190114C: REM optical/NIR detection
  26. GRB 190114B: Liverpool Telescope near-IR observations
  27. CORRECTED TARGET NAME: GRB 190114C: Planned XMM-Newton observation
  28. GRB 190114C: MASTER afterglow Detection
  29. IceCube-190104A: Swift-XRT observations
  30. GRB 190106A: GMG photometry in the 2nd night
  31. GRB 190106A: Swift detection of a burst with an optical counterpart
  32. GRB 181228A: Global MASTER Net OT detection
  33. GRB 181225A: KAIT Follow-Up Observations with Upper Limit
  34. Trigger 878548: Swift detection of AX 1631.9-4752
  35. Konus-Wind observation of GRB 181212A
  36. IPN Triangulation of GRB 181212A (long)
  37. MASTER: OTs detection during Fermi alert trigger 565936249 early observations
  38. GRB 181126B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 564897175)
  39. GRB 181203A: Swift detection of a burst
  40. Konus-Wind observation of GRB 181121A
  41. GRB 181125A: Swift detection of a burst
  42. GRB 181030A: MASTER Net OT detection
  43. GRB 181030A: SAO RAS optical observations
  44. IPN Triangulation of GRB 181028A (long)
  45. GRB 180728B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 554505003)
  46. GRB 181022A: Swift-XRT refined Analysis
  47. GRB 181020A: Swift/UVOT Detection
  48. GRB 181020A: Global MASTER Net OT observations
  49. GRB 181020A: VLT/X-shooter spectroscopy and redshift
  50. GRB 181020A: Swift detection of a burst with an optical counterpart
  51. GRB 181011A: Global MASTER Net optical inspection
  52. GRB 181011A: MAXI/GSC detection
  53. GRB180913A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 558557292)
  54. GRB 181008B: Global MASTER Net optical inspection
  55. GRB 180930A: Swift-XRT refined Analysis
  56. GRB 180930A: Swift detection of a burst
  57. GRB 180914B: OAJ multi-color follow-up
  58. IPN Triangulation of GRB 180914A (long)
  59. GRB 180914B: MASTER OT automatic dtection
  60. GRB 180914B: KAIT Optical Afterglow Candidate
  61. GRB 180828A: RATIR Optical and NIR Observations
  62. GRB 180828A: Swift-BAT refined analysis
  63. GRB 180828A: Swift-XRT refined Analysis
  64. GRB 180828A / Swift J1754.9-2548: Enhanced Swift-XRT position
  65. GRB 180828A: Swift detection of a GRB or possible Galactic Transient Swift J1754.9-2548
  66. GRB 180821A: BOOTES-3/YA optical observations
  67. GRB 180809A: Swift-XRT afterglow detection
  68. GRB 180701A/MAXI J2119-045: CALET Gamma-Ray Burst Monitor data search
  69. GRB 180720B: MASTER Global Net OT observations
  70. GRB 180715B: AstroSat CZTI detection
  71. FRB 180714: MASTER optical inspection of the Fast Rado Burst Transient
  72. GRB 180721A: Swift detection of a burst
  73. GRB 180720C: LT observations
  74. GRB 180718A: MASTER optical observation
  75. GRB180715B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 553369644)
  76. GRB 180718A short GRB detected by IPN and found in ground analysis of BAT data
  77. Swift Trigger 848621 is not an astrophysical event
  78. IceCube-171106A: MASTER optical observation
  79. GRB 180709A: Optical limits
  80. GRB 180703A: Swift/UVOT Upper Limits
  81. GRB 180701A: MAXI/GSC detection
  82. GRB 180626C: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 551697835)
  83. Konus-Wind observation of GRB 180626B
  84. IPN Triangulation of GRB 180626B (short)
  85. GRB 180624A: Swift-BAT refined analysis
  86. GRB 180624A: MITSuME Okayama optical upper limits
  87. Konus-Wind observation of GRB 180618A (a short GRB with extended emission)
  88. GRB 180614A: MASTER observation
  89. Konus-Wind observation of GRB 180611A
  90. GRB 180602A: MITSuME Okayama optical upper limits
  91. IPN Triangulation of GRB 180526A (long)
  92. GRB180523B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 548793993)
  93. GRB 180512A: NOT upper limits
  94. GRB 180512A: Swift detection of a burst
  95. Swift trigger 831888: misidentification of 4U 1416-62
  96. GRB 180425A: Swift detection of a burst
  97. GRB 180410A: Fermi GBM observation
  98. GRB 180411A: Swift-BAT refined analysis
  99. GRB 180411A: Swift-XRT refined Analysis
  100. GRB 180411A: Swift detection of a burst

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