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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"

23705 results found.

  1. GRB 240727A: NOT optical observation
  2. GRB 240727A: Swift-XRT refined Analysis
  3. GRB 240720B: GRBAlpha detection
  4. GRB 240718A: GRBAlpha detection
  5. GRB 240710B: GRBAlpha detection
  6. GRB 240627A: GRBAlpha detection
  7. Fermi GRB 240726A: Global MASTER-Net observations report
  8. Swift GRB240727.16: Global MASTER-Net observations report
  9. GRB 240727B: AstroSat CZTI detection
  10. GRB 240727A: TRT optical afterglow detection
  11. GRB 240727A: KAIT Optical Afterglow Candidate
  12. GRB 240727A: Swift detection of a burst
  13. IceCube Alert 240725.22: Global MASTER-Net observations report
  14. Swift Trigger 1244778 is not a GRB
  15. Swift GRB240725.11: Global MASTER-Net observations report
  16. GRB 240720A: Swift-BAT refined analysis
  17. Fermi trigger No 743418632: Global MASTER-Net observations report
  18. Fermi trigger No 743315411: Global MASTER-Net observations report
  19. Fermi trigger No 743345551: Global MASTER-Net observations report
  20. Fermi trigger No 743219692: Global MASTER-Net observations report
  21. IceCube Alert 240721.68: Global MASTER-Net observations report
  22. GRB 240720B: AstroSat CZTI detection of a short burst
  23. Fermi GRB 240720A: Global MASTER-Net observations report
  24. GRB 240720A: AstroSat CZTI detection
  25. GRB 240720A: Swift detection of a burst
  26. Swift GRB240720.02: Global MASTER-Net observations report
  27. Konus-Wind detection of GRB 240718A
  28. Fermi GRB 240718A: Global MASTER-Net observations report
  29. LAT GRB240718.27: Global MASTER-Net observations report
  30. IceCube-Cascade 240714A: TRT optical observations on the EP/FXT positions
  31. GRB 240712A: Swift-BAT refined analysis
  32. GRB 240716A: GECAM-B detection of a long burst
  33. IceCube-Cascade 240714A: X-ray follow-up observation with EP-FXT
  34. GRB 240713A: 2.2m CAHA optical limit
  35. GRB 240715A: GECAM-C detection of a short burst
  36. Konus-Wind detection of GRB 240715A
  37. GRB 240713A: Swift-XRT observations
  38. GRB 240715A: TRT optical upper limit on one Swift/XRT candidate
  39. GRB 240713A: LAST optical upper limit
  40. Fermi GRB 240715A: Global MASTER-Net observations report
  41. GRB 240713A: optical upper limits from the INAF Asiago Observatory
  42. GRB240715A: GRANDMA Optical Upper Limits
  43. IPN triangulation of GRB 240715A (short)
  44. GW s240422ed: Swift UVOT follow-up
  45. GRB 240712A: Swift/UVOT Upper Limits
  46. EP-WXT flaring star and the optical flaring activity during its decay phase
  47. The EP-WXT source triggered on July 14th is likely a flaring star
  48. GRB 240713A: J-band upper limit from WINTER
  49. GRB 240713A: NOT optical upper limits on three EP/FXT candidates
  50. GRB 240713A: JinShan optical upper limits
  51. GRB 240713A: OHP/T120 optical upper limit
  52. GRB240713A: X-ray follow-up observation with EP-FXT
  53. GRB 240713B: AstroSat CZTI detection of a long burst
  54. GRB240713A: Optical upper limit with Kinder observations
  55. Fermi Sub-threshold Observation of GRB240713A
  56. GRB240713A: TAROT and GRANDMA Observations of SVOM/ECLAIRs GRB240713A
  57. EP240708a: GSP optical upper limit
  58. GRB 240712A: Swift detection of a burst
  59. LIGO/Virgo/KAGRA S240711cm: Coverage and upper limits from MAXI/GSC observations
  60. Fermi trigger No 742405878: Global MASTER-Net observations report
  61. Fermi trigger No 742317942: Global MASTER-Net observations report
  62. EP240708a: KAIT optical upper limit
  63. Fermi GRB 240710A: Global MASTER-Net observations report
  64. EP240708a: NOT optical observations
  65. EP240708a: X-ray follow-up observations with EP/FXT and Swift/XRT
  66. EP240708a: Optical upper limits with Kinder observations
  67. EP240708a: EP-WXT detection of a fast X-ray transient
  68. LIGO/Virgo S240615dg: Swift XRT observations, 28 futher X-ray sources
  69. EP240703b: GSP optical upper limit
  70. EP240703b: TRT optical upper limits
  71. EP240703a: TRT further optical observation
  72. EP240702a: TRT optical upper limits
  73. Konus-Wind detection of GRB 240627A
  74. IPN triangulation of GRB 240628B (short)
  75. EP240703a and EP240703b: Swift/XRT upper limits
  76. LIGO/Virgo/KAGRA S240705at: Identification of a GW compact binary merger candidate
  77. EP240703a: KAIT optical upper limit
  78. EP240703c: Kinder optical follow-up and Swift XRT observations
  79. EP240703a: BOOTES-3 optical upper limit
  80. EP240703a: Kinder optical follow-up observations
  81. EP240703c: EP-WXT detection of an X-ray transient
  82. IPN triangulation of GRB 240627A
  83. The first three GRBs detected by SVOM: X-ray Upper Limits from EP-WXT
  84. EP240703b: EP-WXT detection of a fast X-ray transient
  85. Konus-Wind detection of GRB 240703A (a counterpart of EP240703a)
  86. EP240702a: Swift/XRT upper limit
  87. EP240703a: EP-WXT detection of a fast X-ray transient
  88. EP240702a: GSP optical upper limit
  89. Fermi GRB 240702A: Global MASTER-Net observations report
  90. EP240702a: EP-WXT detection of a fast X-ray transient
  91. GRB 240627A: CALET Gamma-Ray Burst Monitor detection
  92. Fermi trigger No 741448122: Global MASTER-Net observations report
  93. LIGO/Virgo/KAGRA S240629by: Coverage and upper limits from MAXI/GSC observations
  94. Fermi trigger No 741356809: Global MASTER-Net observations report
  95. Fermi GRB 240629A: Global MASTER-Net observations report
  96. Fermi trigger No 741296200: Global MASTER-Net observations report
  97. Fermi trigger No 741251380: Global MASTER-Net observations report
  98. IPN triangulation of GRB 240619C
  99. Fermi trigger No 741211696: Global MASTER-Net observations report
  100. EP240626a: Montarrenti Observatory optical upper limit

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