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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"

5175 results found.

  1. IPN triangulation of GRB 200514B (short)
  2. Fermi trigger No 611434353: Global MASTER-Net observations report
  3. GRB 200517A: MAXI/GSC detection
  4. GRB 200514A: MITSuME Akeno optical upper limits
  5. GRB 200514A: MAXI/GSC detection
  6. GRB 200512A: Swift-XRT refined Analysis
  7. Konus-Wind observation of SGR 1935+2154 activity on 2020 May 10
  8. FRB/X-ray bursts from SGR 1935+2154: No Neutrino Counterpart in ANTARES data
  9. GRB 200506A: Fermi GBM Final Real-time Localization
  10. No optical bursts detected from SGR J1935+2154 by 24 fps observations with Tomo-e Gozen
  11. SGR 1935+2154: MASTER optical observations
  12. Konus-Wind observation of hard X-ray counterpart of the radio burst from SGR 1935+2154
  13. SGR 1935+2154: INTEGRAL hard X-ray counterpart of radio burst
  14. A Forest of Bursts from SGR 1935+2154
  15. SGR 1935+2154 the Insight-HXMT observation plan
  16. IceCube-200425A: No significant detection in HAWC
  17. IceCube-200425A: Upper limits from a search for additional neutrino events in IceCube
  18. Gagarin-day GRB 200412B: observations with the 3.6m Devasthal Optical Telescope
  19. GRB 200424A: Swift/UVOT Upper Limits
  20. GRB 200424A: AstroSat CZTI detection
  21. GRB 200425A: Swift-XRT refined Analysis
  22. GRB 200424A: LCO Optical Upper Limit
  23. GRB 200424A: a long GRB detected by INTEGRAL
  24. Fermi GRB 200423A: Global MASTER-Net observations report
  25. Konus-Wind observation of a bright burst from SGR 1935+2154
  26. Fermi GRB 200421A: Global MASTER-Net observations report
  27. IceCube-200421A: No significant detection in HAWC
  28. IceCube-200421A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  29. Fermi trigger No 608935505: Global MASTER-Net observations report
  30. GRB 200415A: MASTER imspection and possible localisation
  31. Konus-Wind observation of GRB 200415A (a magnetar Giant Flare in Sculptor Galaxy?)
  32. GRB 200416A: Swift-XRT refined Analysis
  33. GRB 200412B: Mondy optical observations
  34. Konus-Wind observation of GRB 200412B
  35. GRB 200412B: Swift-XRT afterglow detection
  36. Fermi GRB 200412A: Global MASTER-Net observations report
  37. Swift GRB 200411A: Global MASTER-Net observations report
  38. GRB 200411A: Swift-XRT refined Analysis
  39. IceCube Alert 200410.97: Global MASTER-Net observations report
  40. Fermi trigger No 608204639: Global MASTER-Net observations report
  41. GRB 200410A: Swift-XRT refined Analysis
  42. Baksan Neutrino Observatory Alert 200408.26: Global MASTER-Net observations report
  43. Baksan Neutrino Observatory Alert 200409.23: Global MASTER-Net observations report
  44. GRB 200409A: Swift-XRT refined Analysis
  45. Fermi GRB 200407B: Global MASTER-Net observations report
  46. Fermi GRB 200403A: Global MASTER-Net observations report
  47. LIGO/Virgo S200224ca: Upper limits from Konus-Wind observations
  48. Fermi GRB 200402C: Global MASTER-Net observations report
  49. Fermi GRB 200402A: Global MASTER-Net observations report
  50. Fermi GRB 200401A: Global MASTER-Net observations report
  51. IPN triangulation of GRB 200327A (short)
  52. GRB 200326B: AstroSat LAXPC detection
  53. Fermi trigger No 606799116: Global MASTER-Net observations report
  54. GRB 200326A: Fermi GBM Final Real-time Localization
  55. GRB 200324A: AROMA-N Optical Observation
  56. Fermi trigger No 606840801: Global MASTER-Net observations report
  57. GRB 200324A:: TSHAO optical upper limit
  58. GRB 200324A: Swift-XRT refined Analysis
  59. Swift GRB200324.69: Global MASTER-Net observations report
  60. Fermi trigger No 606681997: Global MASTER-Net observations report
  61. LIGO/Virgo S200316bj : No significant candidates in TAROT - FRAM - GRANDMA observations.
  62. LIGO/Virgo S200316bj: no counterpart candidate in SVOM/GWAC observations
  63. LIGO/Virgo S200316bj: No neutrino candidates at Pierre Auger Observatory
  64. LIGO/Virgo S200316bj: No Counterparts in DDOTI/OAN Optical Observations
  65. LIGO/Virgo S200316bj: Coverage and upper limits from MAXI/GSC observations
  66. IPN triangulation of GRB 200313A
  67. Fermi trigger No 605756501: Global MASTER-Net observations report
  68. LIGO/Virgo S200224ca: DESGW Summary of DECam Observations
  69. GRB 200310A: MAXI/GSC detection
  70. Fermi trigger No 605309224: Global MASTER-Net observations report
  71. GRB 200306C: Swift-XRT refined Analysis
  72. GRB 200306A: Swift-XRT refined Analysis
  73. LIGO/Virgo S200302c : No significant candidates in FRAM - TAROT - GRANDMA observations.
  74. Swift GRB200306.01: Global MASTER-Net observations report
  75. GRB 200303A: Swift-XRT refined Analysis
  76. LIGO/Virgo S200302c: No counterpart candidates in KAIT observations
  77. LIGO/Virgo S200302c: Coverage and upper limits from MAXI/GSC observations
  78. GRB 200228B: Mondy, TSHAO, AbAO and CrAO optical observations, afterglow candidate
  79. LIGO/Virgo S200225q : No significant candidates in TAROT - FRAM - GRANDMA observations.
  80. GRB 200228B: Swift-XRT refined Analysis
  81. GRB 200227A: Swift-XRT refined Analysis
  82. GRB 200224A: Mondy optical upper limit
  83. GRB 200227A: Fermi GBM observation
  84. LIGO/Virgo S200224ca : No significant candidates in TAROT - FRAM - GRANDMA observations
  85. LIGO/Virgo S200224ca: Upper limits from CALET observations.
  86. LIGO/Virgo S200225q: no counterpart candidate in SVOM/GWAC observations
  87. GRB 200224B: DDOTI/OAN optical observations report
  88. LIGO/Virgo S200224ca: No counterpart candidates in KAIT observations
  89. LIGO/Virgo S200224ca: GRAWITA-Campo Imperatore observations.
  90. Fermi trigger No 604231129: Global MASTER-Net observations report
  91. LIGO/Virgo S200224ca: Subaru/Hyper Suprime-Cam follow-up observations
  92. LIGO/Virgo S200224ca: No counterpart candidates in Fermi-LAT observations
  93. LIGO/Virgo S200225q: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  94. LIGO/Virgo S200224ca: upper limits from AGILE/GRID observations
  95. GRB 200224A: LCO Upper Limits
  96. LIGO/Virgo S200224ca: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  97. LIGO/Virgo S200224ca: Coverage and upper limits from MAXI/GSC observations
  98. LIGO/Virgo S200224ca: upper limits from AGILE/MCAL observations
  99. LIGO/Virgo S200224ca: Global MASTER-Net observations report
  100. LIGO/Virgo S200224ca: Upper limits from IceCube neutrino searches

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