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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"

37579 results found.

  1. GRB 240727B: AstroSat CZTI detection
  2. GRB 240726B: AstroSat CZTI detection of a short burst
  3. GRB240727A: Skynet Optical Afterglow Observations
  4. GRB 240727A: TRT optical afterglow detection
  5. GRB 240727A: KAIT Optical Afterglow Candidate
  6. GRB 240727A: Swift detection of a burst
  7. GRB 240726A: AstroSat CZTI detection of a short burst
  8. GRB 240726A: Fermi GBM Final Real-time Localization
  9. Fermi-LAT gamma-ray observations of IceCube-240725A
  10. IceCube-240725A - IceCube observation of a high-energy neutrino candidate track-like event
  11. Swift Trigger 1244778 is not a GRB
  12. GRB 240720A: Swift-BAT refined analysis
  13. Fermi trigger No 743418632: Global MASTER-Net observations report
  14. Fermi trigger No 743315411: Global MASTER-Net observations report
  15. LIGO/Virgo/KAGRA S240716b: Upper limits from Swift/BAT-GUANO
  16. LIGO/Virgo/KAGRA S240703ad: Upper limits from Swift/BAT-GUANO
  17. Fermi trigger No 743345551: Global MASTER-Net observations report
  18. Fermi-LAT gamma-ray observations of IceCube-240721A
  19. Fermi Gamma-ray Burst Monitor trigger 743271526/240721680 is not a GRB
  20. Fermi trigger No 743219692: Global MASTER-Net observations report
  21. IceCube-240721A - IceCube observation of a high-energy neutrino candidate track-like event
  22. Fermi Gamma-ray Burst Monitor trigger 743243582/240721356 (GRB 240721A) is not a GRB
  23. GRB 240720B: SVOM/GRM observation
  24. GRB 240721A: Fermi GBM Final Real-time Localization
  25. GRB 240720B: AstroSat CZTI detection of a short burst
  26. Fermi GRB 240720A: Global MASTER-Net observations report
  27. GRB 240720A: AstroSat CZTI detection
  28. GRB 240720A: Fermi GBM observation
  29. GRB 240720A: Swift detection of a burst
  30. Konus-Wind detection of GRB 240718A
  31. GRB 240713A: SVOM/GRM observation
  32. Fermi GRB 240718A: Global MASTER-Net observations report
  33. GRB 240718A: Fermi GBM Observation
  34. GRB 240718A: Fermi-LAT Detection
  35. GRB 240718A: SVOM/GRM observation
  36. GRB 240718A: BALROG localization (Fermi Trigger 742976945 / GRB 240718270)
  37. GRB 240718A: Fermi GBM Final Real-time Localization
  38. GRB 240712A: Swift-BAT refined analysis
  39. GRB 240716A: GECAM-B detection of a long burst
  40. SVOM/GRM In-Flight Trigger of GRB 240716A
  41. GRB 240713A: 2.2m CAHA optical limit
  42. Fermi-LAT gamma-ray observations of IceCube-cascade-240714A
  43. GRB 240715A: Swift/UVOT observations of the XRT sources.
  44. GRB 240715A: Swift-XRT observations
  45. GRB240713A: Swift/UVOT Upper LImits
  46. GRB 240715A: GECAM-C detection of a short burst
  47. Konus-Wind detection of GRB 240715A
  48. GRB 240713A: Swift-XRT observations
  49. GRB 240715A: TRT optical upper limit on one Swift/XRT candidate
  50. GRB 240712A: Swift-XRT refined Analysis
  51. SVOM/GRM In-Flight Trigger of GRB 240715A
  52. GRB 240713A: LAST optical upper limit
  53. GRB 240715A: Swift ToO observations
  54. Fermi GRB 240715A: Global MASTER-Net observations report
  55. GRB 240713A: optical upper limits from the INAF Asiago Observatory
  56. GRB 240715A: Fermi GBM Observation
  57. GRB 240712A ATCA radio observations
  58. GRB240715A: GRANDMA Optical Upper Limits
  59. IPN triangulation of GRB 240715A (short)
  60. GRB 240712A: Swift/UVOT Upper Limits
  61. GRB 240715A: Fermi GBM Final Real-time Localization
  62. GRB 240713A: Tiled Swift observations
  63. GRB 240713A: J-band upper limit from WINTER
  64. GRB 240713A: NOT optical upper limits on three EP/FXT candidates
  65. GRB 240713A: JinShan optical upper limits
  66. GRB 240713A: OHP/T120 optical upper limit
  67. GRB240713A: X-ray follow-up observation with EP-FXT
  68. GRB 240713B: AstroSat CZTI detection of a long burst
  69. Fermi Sub-threshold Observation of GRB240713A
  70. GRB240713A : The first probable GRB Located on-Board SVOM by ECLAIRs
  71. Fermi Gamma-ray Burst Monitor trigger 742413075/240711744 is not a GRB
  72. GRB 240712A: Swift detection of a burst
  73. GRB 240711A: Fermi GBM Final Real-time Localization
  74. Fermi trigger No 742405878: Global MASTER-Net observations report
  75. Fermi trigger No 742317942: Global MASTER-Net observations report
  76. EP240708a: KAIT optical upper limit
  77. Fermi GRB 240710A: Global MASTER-Net observations report
  78. GRB 240710A: Fermi GBM Final Real-time Localization
  79. EP240708a: SVOM/C-GFT optical upper limit
  80. Fermi Gamma-ray Burst Monitor trigger 741911057/240705933 is not a GRB
  81. GRB 240705A: Fermi GBM Final Real-time Localization
  82. Konus-Wind detection of GRB 240627A
  83. IPN triangulation of GRB 240628B (short)
  84. EP240703a: KAIT optical upper limit
  85. EP240703a: BTA observations
  86. EP240703a/GRB 240703A: TRT optical candidate likely not real
  87. EP240703a/GRB 240703A: TRT and JinShan decaying optical afterglow candidate
  88. IPN triangulation of GRB 240627A
  89. GRB 240619A: Host galaxy redshift from VLT/X-shooter
  90. The first three GRBs detected by SVOM: X-ray Upper Limits from EP-WXT
  91. Konus-Wind detection of GRB 240703A (a counterpart of EP240703a)
  92. The first three GRBs detected by SVOM: GRB 240627B, GRB 240629A and GRB 240702A
  93. GRB 240702A: BALROG localization (Fermi Trigger / GRB 240702885)
  94. Fermi GRB 240702A: Global MASTER-Net observations report
  95. GRB 240702A: Fermi GBM Final Real-time Localization
  96. LIGO/Virgo/KAGRA S240627by: Upper limits from Swift/BAT-GUANO
  97. Fermi Gamma-ray Burst Monitor trigger 741448122/240630575 is not a GRB
  98. GRB 240627A: CALET Gamma-Ray Burst Monitor detection
  99. Fermi trigger No 741448122: Global MASTER-Net observations report
  100. LIGO/Virgo/KAGRA S240629by: Upper limits from Fermi-GBM Observations

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