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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"

5164 results found.

  1. Konus-Wind observation of hard X-ray counterpart of the radio burst from SGR 1935+2154
  2. SGR 1935+2154: INTEGRAL hard X-ray counterpart of radio burst
  3. A Forest of Bursts from SGR 1935+2154
  4. SGR 1935+2154 the Insight-HXMT observation plan
  5. IceCube-200425A: No significant detection in HAWC
  6. IceCube-200425A: Upper limits from a search for additional neutrino events in IceCube
  7. Gagarin-day GRB 200412B: observations with the 3.6m Devasthal Optical Telescope
  8. GRB 200424A: Swift/UVOT Upper Limits
  9. GRB 200424A: AstroSat CZTI detection
  10. GRB 200425A: Swift-XRT refined Analysis
  11. GRB 200424A: LCO Optical Upper Limit
  12. GRB 200424A: a long GRB detected by INTEGRAL
  13. Fermi GRB 200423A: Global MASTER-Net observations report
  14. Konus-Wind observation of a bright burst from SGR 1935+2154
  15. Fermi GRB 200421A: Global MASTER-Net observations report
  16. IceCube-200421A: No significant detection in HAWC
  17. IceCube-200421A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  18. Fermi trigger No 608935505: Global MASTER-Net observations report
  19. GRB 200415A: MASTER imspection and possible localisation
  20. Konus-Wind observation of GRB 200415A (a magnetar Giant Flare in Sculptor Galaxy?)
  21. GRB 200416A: Swift-XRT refined Analysis
  22. GRB 200412B: Mondy optical observations
  23. Konus-Wind observation of GRB 200412B
  24. GRB 200412B: Swift-XRT afterglow detection
  25. Fermi GRB 200412A: Global MASTER-Net observations report
  26. Swift GRB 200411A: Global MASTER-Net observations report
  27. GRB 200411A: Swift-XRT refined Analysis
  28. IceCube Alert 200410.97: Global MASTER-Net observations report
  29. Fermi trigger No 608204639: Global MASTER-Net observations report
  30. GRB 200410A: Swift-XRT refined Analysis
  31. Baksan Neutrino Observatory Alert 200408.26: Global MASTER-Net observations report
  32. Baksan Neutrino Observatory Alert 200409.23: Global MASTER-Net observations report
  33. GRB 200409A: Swift-XRT refined Analysis
  34. Fermi GRB 200407B: Global MASTER-Net observations report
  35. Fermi GRB 200403A: Global MASTER-Net observations report
  36. LIGO/Virgo S200224ca: Upper limits from Konus-Wind observations
  37. Fermi GRB 200402C: Global MASTER-Net observations report
  38. Fermi GRB 200402A: Global MASTER-Net observations report
  39. Fermi GRB 200401A: Global MASTER-Net observations report
  40. IPN triangulation of GRB 200327A (short)
  41. GRB 200326B: AstroSat LAXPC detection
  42. Fermi trigger No 606799116: Global MASTER-Net observations report
  43. GRB 200326A: Fermi GBM Final Real-time Localization
  44. GRB 200324A: AROMA-N Optical Observation
  45. Fermi trigger No 606840801: Global MASTER-Net observations report
  46. GRB 200324A:: TSHAO optical upper limit
  47. GRB 200324A: Swift-XRT refined Analysis
  48. Swift GRB200324.69: Global MASTER-Net observations report
  49. Fermi trigger No 606681997: Global MASTER-Net observations report
  50. LIGO/Virgo S200316bj : No significant candidates in TAROT - FRAM - GRANDMA observations.
  51. LIGO/Virgo S200316bj: no counterpart candidate in SVOM/GWAC observations
  52. LIGO/Virgo S200316bj: No neutrino candidates at Pierre Auger Observatory
  53. LIGO/Virgo S200316bj: No Counterparts in DDOTI/OAN Optical Observations
  54. LIGO/Virgo S200316bj: Coverage and upper limits from MAXI/GSC observations
  55. IPN triangulation of GRB 200313A
  56. Fermi trigger No 605756501: Global MASTER-Net observations report
  57. LIGO/Virgo S200224ca: DESGW Summary of DECam Observations
  58. GRB 200310A: MAXI/GSC detection
  59. Fermi trigger No 605309224: Global MASTER-Net observations report
  60. GRB 200306C: Swift-XRT refined Analysis
  61. GRB 200306A: Swift-XRT refined Analysis
  62. LIGO/Virgo S200302c : No significant candidates in FRAM - TAROT - GRANDMA observations.
  63. Swift GRB200306.01: Global MASTER-Net observations report
  64. GRB 200303A: Swift-XRT refined Analysis
  65. LIGO/Virgo S200302c: No counterpart candidates in KAIT observations
  66. LIGO/Virgo S200302c: Coverage and upper limits from MAXI/GSC observations
  67. GRB 200228B: Mondy, TSHAO, AbAO and CrAO optical observations, afterglow candidate
  68. LIGO/Virgo S200225q : No significant candidates in TAROT - FRAM - GRANDMA observations.
  69. GRB 200228B: Swift-XRT refined Analysis
  70. GRB 200227A: Swift-XRT refined Analysis
  71. GRB 200224A: Mondy optical upper limit
  72. GRB 200227A: Fermi GBM observation
  73. LIGO/Virgo S200224ca : No significant candidates in TAROT - FRAM - GRANDMA observations
  74. LIGO/Virgo S200224ca: Upper limits from CALET observations.
  75. LIGO/Virgo S200225q: no counterpart candidate in SVOM/GWAC observations
  76. GRB 200224B: DDOTI/OAN optical observations report
  77. LIGO/Virgo S200224ca: No counterpart candidates in KAIT observations
  78. LIGO/Virgo S200224ca: GRAWITA-Campo Imperatore observations.
  79. Fermi trigger No 604231129: Global MASTER-Net observations report
  80. LIGO/Virgo S200224ca: Subaru/Hyper Suprime-Cam follow-up observations
  81. LIGO/Virgo S200224ca: No counterpart candidates in Fermi-LAT observations
  82. LIGO/Virgo S200225q: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  83. LIGO/Virgo S200224ca: upper limits from AGILE/GRID observations
  84. GRB 200224A: LCO Upper Limits
  85. LIGO/Virgo S200224ca: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  86. LIGO/Virgo S200224ca: Coverage and upper limits from MAXI/GSC observations
  87. LIGO/Virgo S200224ca: upper limits from AGILE/MCAL observations
  88. LIGO/Virgo S200224ca: Global MASTER-Net observations report
  89. LIGO/Virgo S200224ca: Upper limits from IceCube neutrino searches
  90. LIGO/Virgo S200224ca: Identification of a GW compact binary merger candidate The LIGO Scientific Collaboration and the Virgo Collaboration
  91. Correction in name: GRB 200224B and GRB 200224C (not GRB 200224A)
  92. GRB 200224A: Swift-XRT refined Analysis
  93. GRB 200224C: Fermi GBM Final Real-time Localization
  94. GRB 200224A: Tautenburg observations
  95. Fermi trigger No 604213554: Global MASTER-Net observations report
  96. GRB 200224B: Fermi GBM Final Real-time Localization
  97. GRB 200224A: Swift detection of a burst
  98. Swift GRB200224.14: Global MASTER-Net observations report
  99. LIGO/Virgo S200219ac: no counterpart candidate in SVOM/GWAC-F30 observations
  100. LIGO/Virgo S200219ac: no counterpart candidate in SVOM/GWAC observations

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