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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"

45721 results found.

  1. GRB 240718A: GRBAlpha detection
  2. GRB 240710B: GRBAlpha detection
  3. GRB 240627A: GRBAlpha detection
  4. Fermi GRB 240726A: Global MASTER-Net observations report
  5. GRB 240727A: Enhanced Swift-XRT position
  6. GRB 240727B: Fermi GBM Observation
  7. Swift GRB240727.16: Global MASTER-Net observations report
  8. GRB240529A: VIRT optical transient detection
  9. GRB 240727B: Swift ToO observations
  10. GRB 240727B: Swift/BAT-GUANO arcminute localization of a long burst
  11. GRB 240726A: SVOM/GRM observation
  12. GRB 240727B: AstroSat CZTI detection
  13. GRB 240726B: AstroSat CZTI detection of a short burst
  14. GRB240727A: Skynet Optical Afterglow Observations
  15. GRB 240727A: TRT optical afterglow detection
  16. GRB 240727A: KAIT Optical Afterglow Candidate
  17. GRB 240727A: Swift detection of a burst
  18. GRB 240726A: AstroSat CZTI detection of a short burst
  19. IceCube-240725A: Upper limits from a search for additional neutrino events in IceCube
  20. GRB 240726A: Fermi GBM Final Real-time Localization
  21. Fermi-LAT gamma-ray observations of IceCube-240725A
  22. IceCube Alert 240725.22: Global MASTER-Net observations report
  23. IceCube-240725A - IceCube observation of a high-energy neutrino candidate track-like event
  24. Swift Trigger 1244778 is not a GRB
  25. Swift GRB240725.11: Global MASTER-Net observations report
  26. IceCube-240721A: Two candidates from the Zwicky Transient Facility
  27. GRB 240720A: Swift-BAT refined analysis
  28. IceCube-240721A: Upper limits from a search for additional neutrino events in IceCube
  29. Fermi trigger No 743418632: Global MASTER-Net observations report
  30. Fermi trigger No 743315411: Global MASTER-Net observations report
  31. LIGO/Virgo/KAGRA S240716b: Upper limits from Swift/BAT-GUANO
  32. LIGO/Virgo/KAGRA S240703ad: Upper limits from Swift/BAT-GUANO
  33. Fermi trigger No 743345551: Global MASTER-Net observations report
  34. Fermi-LAT gamma-ray observations of IceCube-240721A
  35. Fermi Gamma-ray Burst Monitor trigger 743271526/240721680 is not a GRB
  36. Fermi trigger No 743219692: Global MASTER-Net observations report
  37. IceCube-240721A - IceCube observation of a high-energy neutrino candidate track-like event
  38. IceCube Alert 240721.68: Global MASTER-Net observations report
  39. Fermi Gamma-ray Burst Monitor trigger 743243582/240721356 (GRB 240721A) is not a GRB
  40. GRB 240720B: SVOM/GRM observation
  41. GRB 240721A: Fermi GBM Final Real-time Localization
  42. GRB 240720B: AstroSat CZTI detection of a short burst
  43. Fermi GRB 240720A: Global MASTER-Net observations report
  44. GRB 240720A: AstroSat CZTI detection
  45. GRB 240720A: Fermi GBM observation
  46. GRB 240720A: Swift detection of a burst
  47. Swift GRB240720.02: Global MASTER-Net observations report
  48. Konus-Wind detection of GRB 240718A
  49. GRB 240713A: SVOM/GRM observation
  50. Fermi GRB 240718A: Global MASTER-Net observations report
  51. LAT GRB240718.27: Global MASTER-Net observations report
  52. GRB 240718A: Fermi GBM Observation
  53. IceCube-Cascade 240714A: TRT optical observations on the EP/FXT positions
  54. GRB 240718A: Fermi-LAT Detection
  55. GRB 240718A: SVOM/GRM observation
  56. GRB 240718A: BALROG localization (Fermi Trigger 742976945 / GRB 240718270)
  57. GRB 240718A: Fermi GBM Final Real-time Localization
  58. GRB 240712A: Swift-BAT refined analysis
  59. GRB 240716A: GECAM-B detection of a long burst
  60. SVOM/GRM In-Flight Trigger of GRB 240716A
  61. IceCube-Cascade 240714A: X-ray follow-up observation with EP-FXT
  62. GRB 240713A: 2.2m CAHA optical limit
  63. Fermi-LAT gamma-ray observations of IceCube-cascade-240714A
  64. GRB 240715A: Swift/UVOT observations of the XRT sources.
  65. GRB 240715A: Swift-XRT observations
  66. GRB240713A: Swift/UVOT Upper LImits
  67. EP240708a: X-ray follow-up observations with Swift/XRT
  68. GRB 240715A: GECAM-C detection of a short burst
  69. Konus-Wind detection of GRB 240715A
  70. LIGO/Virgo/KAGRA S240716b: Updated Sky localization
  71. GRB 240713A: Swift-XRT observations
  72. GRB 240715A: TRT optical upper limit on one Swift/XRT candidate
  73. GRB 240712A: Swift-XRT refined Analysis
  74. SVOM/GRM In-Flight Trigger of GRB 240715A
  75. GRB 240713A: LAST optical upper limit
  76. LIGO/Virgo/KAGRA S240716b: Identification of a GW compact binary merger candidate
  77. GRB 240715A: Swift ToO observations
  78. Fermi GRB 240715A: Global MASTER-Net observations report
  79. GRB 240713A: optical upper limits from the INAF Asiago Observatory
  80. GRB 240715A: Fermi GBM Observation
  81. GRB 240712A ATCA radio observations
  82. GRB240715A: GRANDMA Optical Upper Limits
  83. IPN triangulation of GRB 240715A (short)
  84. GW s240422ed: Swift UVOT follow-up
  85. GRB 240712A: Swift/UVOT Upper Limits
  86. EP-WXT flaring star and the optical flaring activity during its decay phase
  87. JinShan confirmation of the EP-WXT source triggered on July 14th due to a flaring star
  88. The EP-WXT source triggered on July 14th is likely a flaring star
  89. GRB 240715A: Fermi GBM Final Real-time Localization
  90. GRB 240713A: Tiled Swift observations
  91. GRB 240713A: J-band upper limit from WINTER
  92. GRB 240713A: NOT optical upper limits on three EP/FXT candidates
  93. GRB 240713A: JinShan optical upper limits
  94. GRB 240713A: OHP/T120 optical upper limit
  95. GRB240713A: X-ray follow-up observation with EP-FXT (duplicate submission of GCN 36859)
  96. GRB240713A: X-ray follow-up observation with EP-FXT
  97. GRB 240713B: AstroSat CZTI detection of a long burst
  98. GRB240713A: Optical upper limit with Kinder observations
  99. Fermi Sub-threshold Observation of GRB240713A
  100. GRB240713A: TAROT and GRANDMA Observations of SVOM/ECLAIRs GRB240713A

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