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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"

5039 results found.

  1. Fermi GRB 200803A: Global MASTER-Net observations report
  2. Fermi GRB 200801A: Global MASTER-Net observations report
  3. Swift Detection of an SGR-like flare from AX J1846.4-0258
  4. GRB 200729A: RT-22 observations at 36.8 GHz
  5. GRB 200729A: Swift-XRT refined Analysis
  6. GRB 200724A: Fermi GBM Final Real-time Localization
  7. GRB 200723A: BALROG localization (Fermi Trigger 617214929 / GRB 200723691)
  8. GRB 200723A: Fermi GBM Final Real-time Localization
  9. GRB 200716C: Kitab optical observations
  10. GRB 200716C: CrAO, Terskol, Assy-Turgen optical observations
  11. GRB 200716C: Swift-XRT refined Analysis
  12. GRB 200715A: Swift-XRT afterglow detection
  13. Fermi GRB 200714D: Global MASTER-Net observations report
  14. Fermi GRB 200714A: Global MASTER-Net observations report
  15. GRB 200713A: Swift-XRT refined Analysis
  16. Fermi trigger No 616370565: Global MASTER-Net observations report
  17. GRB 200711A: Swift-XRT refined Analysis
  18. Fermi GRB 200705A: Global MASTER-Net observations report
  19. Fermi-LAT-ANTARES 200407a Coincidence
  20. GRB 200702A: Fermi GBM Final Real-time Localization
  21. GRB 200630A: Swift-XRT refined Analysis
  22. GRB 200623A: LBT optical observations
  23. Fermi GRB 200625A: Global MASTER-Net observations report
  24. GRB 200623A: Swift/BAT-GUANO detection and arcminute localization of a short GRB
  25. Fermi trigger No 614239407: Global MASTER-Net observations report
  26. Fermi trigger No 614226976: Global MASTER-Net observations report
  27. Fermi trigger No 614103490: Global MASTER-Net observations report
  28. Baksan Neutrino Observatory Alert 200617.47: Global MASTER-Net observations report
  29. Fermi GRB 200616A: Global MASTER-Net observations report
  30. Fermi GRB 200615A: Global MASTER-Net observations report
  31. GRB 200615A: Fermi GBM Final Real-time Localization
  32. Baksan Neutrino Observatory Alert 200614.34: Global MASTER-Net observations report
  33. Fermi GRB 200614A: Global MASTER-Net observations report
  34. GRB 200612A: Swift-XRT refined Analysis
  35. GRB 200612A: Swift detection of a burst
  36. GRB 200609A: Fermi GBM Final Real-time Localization
  37. GRB 200608A: BOOTES-3 and BOOTES-4 optical upper limit
  38. GRB 200608A: Swift detection of a burst
  39. Fermi GRB 200607B: Global MASTER-Net observations report
  40. Fermi GRB 200607A: Global MASTER-Net observations report
  41. Baksan Neutrino Observatory Alert 200603.12: Global MASTER-Net observations report
  42. GRB 200529A: Swift-XRT refined Analysis
  43. GRB 200528A: Swift-XRT refined Analysis
  44. GRB 200529A: Swift detection of a burst
  45. GRB 200528A: Fermi GBM Final Real-time Localization
  46. IceCube-200523A: Upper limits from a search for additional neutrino events in IceCube
  47. GRB 200522A: Gemini North optical imaging
  48. GRB 200524A: CrAO optical observations
  49. GRB 200524A: Kitab observatory afterglow observations
  50. GRB 200524A: AstroSat CZTI detection
  51. GRB 200524A: OAJ multicolor afterglow detection
  52. GRB 200524A: Fermi GBM detection
  53. GRB 200524A: Liverpool Telescope observations
  54. GRB 200524A: CrAO observations of ZTF20abbiixp
  55. Fermi GRB 200524A: Global MASTER-Net observations report
  56. ZTF Discovery of ZTF20abbiixp: The Likely Optical Afterglow to GRB 200524A
  57. GRB 200524A: Fermi-LAT detection
  58. CGBM-SPI-ACS triangulation of short GRB 200521A
  59. GRB 200522A: Swift-XRT refined Analysis
  60. Fermi GRB 200522B: Global MASTER-Net observations report
  61. GRB 200514B: Fermi GBM observation
  62. GRB 200519A: Swift-BAT refined analysis
  63. Fermi trigger No 611676654: Global MASTER-Net observations report
  64. GRB 200519A: Swift-XRT refined Analysis
  65. IPN triangulation of GRB 200514B (short)
  66. Fermi trigger No 611434353: Global MASTER-Net observations report
  67. GRB 200517A: MAXI/GSC detection
  68. GRB 200514A: MITSuME Akeno optical upper limits
  69. GRB 200514A: MAXI/GSC detection
  70. GRB 200512A: Swift-XRT refined Analysis
  71. Konus-Wind observation of SGR 1935+2154 activity on 2020 May 10
  72. FRB/X-ray bursts from SGR 1935+2154: No Neutrino Counterpart in ANTARES data
  73. GRB 200506A: Fermi GBM Final Real-time Localization
  74. No optical bursts detected from SGR J1935+2154 by 24 fps observations with Tomo-e Gozen
  75. SGR 1935+2154: MASTER optical observations
  76. Konus-Wind observation of hard X-ray counterpart of the radio burst from SGR 1935+2154
  77. SGR 1935+2154: INTEGRAL hard X-ray counterpart of radio burst
  78. A Forest of Bursts from SGR 1935+2154
  79. SGR 1935+2154 the Insight-HXMT observation plan
  80. IceCube-200425A: No significant detection in HAWC
  81. IceCube-200425A: Upper limits from a search for additional neutrino events in IceCube
  82. Gagarin-day GRB 200412B: observations with the 3.6m Devasthal Optical Telescope
  83. GRB 200424A: Swift/UVOT Upper Limits
  84. GRB 200424A: AstroSat CZTI detection
  85. GRB 200425A: Swift-XRT refined Analysis
  86. GRB 200424A: LCO Optical Upper Limit
  87. GRB 200424A: a long GRB detected by INTEGRAL
  88. Fermi GRB 200423A: Global MASTER-Net observations report
  89. Konus-Wind observation of a bright burst from SGR 1935+2154
  90. Fermi GRB 200421A: Global MASTER-Net observations report
  91. IceCube-200421A: No significant detection in HAWC
  92. IceCube-200421A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  93. Fermi trigger No 608935505: Global MASTER-Net observations report
  94. GRB 200415A: MASTER imspection and possible localisation
  95. Konus-Wind observation of GRB 200415A (a magnetar Giant Flare in Sculptor Galaxy?)
  96. GRB 200416A: Swift-XRT refined Analysis
  97. GRB 200412B: Mondy optical observations
  98. Konus-Wind observation of GRB 200412B
  99. GRB 200412B: Swift-XRT afterglow detection
  100. Fermi GRB 200412A: Global MASTER-Net observations report

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