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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"

27276 results found.

  1. GRB 240727B: AstroSat CZTI detection
  2. GRB240727A: Skynet Optical Afterglow Observations
  3. GRB 240727A: Swift detection of a burst
  4. GRB 240726A: Fermi GBM Final Real-time Localization
  5. IceCube Alert 240725.22: Global MASTER-Net observations report
  6. Swift Trigger 1244778 is not a GRB
  7. Swift GRB240725.11: Global MASTER-Net observations report
  8. GRB 240720A: Swift-BAT refined analysis
  9. Fermi trigger No 743418632: Global MASTER-Net observations report
  10. Fermi trigger No 743315411: Global MASTER-Net observations report
  11. LIGO/Virgo/KAGRA S240716b: Upper limits from Swift/BAT-GUANO
  12. LIGO/Virgo/KAGRA S240703ad: Upper limits from Swift/BAT-GUANO
  13. Fermi trigger No 743345551: Global MASTER-Net observations report
  14. Fermi Gamma-ray Burst Monitor trigger 743271526/240721680 is not a GRB
  15. Fermi trigger No 743219692: Global MASTER-Net observations report
  16. IceCube Alert 240721.68: Global MASTER-Net observations report
  17. Fermi Gamma-ray Burst Monitor trigger 743243582/240721356 (GRB 240721A) is not a GRB
  18. GRB 240720B: SVOM/GRM observation
  19. GRB 240721A: Fermi GBM Final Real-time Localization
  20. GRB 240720B: AstroSat CZTI detection of a short burst
  21. Fermi GRB 240720A: Global MASTER-Net observations report
  22. GRB 240720A: AstroSat CZTI detection
  23. GRB 240720A: Fermi GBM observation
  24. GRB 240720A: Swift detection of a burst
  25. Swift GRB240720.02: Global MASTER-Net observations report
  26. GRB 240713A: SVOM/GRM observation
  27. Fermi GRB 240718A: Global MASTER-Net observations report
  28. LAT GRB240718.27: Global MASTER-Net observations report
  29. GRB 240718A: Fermi GBM Observation
  30. GRB 240718A: Fermi-LAT Detection
  31. GRB 240718A: SVOM/GRM observation
  32. GRB 240718A: BALROG localization (Fermi Trigger 742976945 / GRB 240718270)
  33. GRB 240718A: Fermi GBM Final Real-time Localization
  34. GRB 240712A: Swift-BAT refined analysis
  35. GRB 240716A: GECAM-B detection of a long burst
  36. SVOM/GRM In-Flight Trigger of GRB 240716A
  37. IceCube-Cascade 240714A: X-ray follow-up observation with EP-FXT
  38. GRB 240713A: 2.2m CAHA optical limit
  39. GRB 240715A: Swift/UVOT observations of the XRT sources.
  40. GRB240713A: Swift/UVOT Upper LImits
  41. GRB 240715A: GECAM-C detection of a short burst
  42. Konus-Wind detection of GRB 240715A
  43. GRB 240715A: TRT optical upper limit on one Swift/XRT candidate
  44. GRB 240712A: Swift-XRT refined Analysis
  45. SVOM/GRM In-Flight Trigger of GRB 240715A
  46. Fermi GRB 240715A: Global MASTER-Net observations report
  47. GRB 240715A: Fermi GBM Observation
  48. GRB240715A: GRANDMA Optical Upper Limits
  49. IPN triangulation of GRB 240715A (short)
  50. GRB 240712A: Swift/UVOT Upper Limits
  51. EP-WXT flaring star and the optical flaring activity during its decay phase
  52. JinShan confirmation of the EP-WXT source triggered on July 14th due to a flaring star
  53. The EP-WXT source triggered on July 14th is likely a flaring star
  54. GRB 240715A: Fermi GBM Final Real-time Localization
  55. GRB 240713A: J-band upper limit from WINTER
  56. GRB 240713A: NOT optical upper limits on three EP/FXT candidates
  57. GRB 240713A: JinShan optical upper limits
  58. GRB 240713A: OHP/T120 optical upper limit
  59. GRB240713A: X-ray follow-up observation with EP-FXT
  60. GRB240713A: Optical upper limit with Kinder observations
  61. Fermi Sub-threshold Observation of GRB240713A
  62. GRB240713A: TAROT and GRANDMA Observations of SVOM/ECLAIRs GRB240713A
  63. GRB240713A : The first probable GRB Located on-Board SVOM by ECLAIRs
  64. Fermi Gamma-ray Burst Monitor trigger 742413075/240711744 is not a GRB
  65. EP240708a: GSP optical upper limit
  66. GRB 240712A: Swift detection of a burst
  67. LIGO/Virgo/KAGRA S240711cm: Coverage and upper limits from MAXI/GSC observations
  68. GRB 240711A: Fermi GBM Final Real-time Localization
  69. Fermi trigger No 742405878: Global MASTER-Net observations report
  70. Fermi trigger No 742317942: Global MASTER-Net observations report
  71. EP240708a: KAIT optical upper limit
  72. Fermi GRB 240710A: Global MASTER-Net observations report
  73. GRB 240710A: Fermi GBM Final Real-time Localization
  74. EP240708a: NOT optical observations
  75. EP240708a: SVOM/C-GFT optical upper limit
  76. EP240708a: X-ray follow-up observations with EP/FXT and Swift/XRT
  77. EP240708a: Optical upper limits with Kinder observations
  78. EP240708a: EP-WXT detection of a fast X-ray transient
  79. LIGO/Virgo S240615dg: Swift XRT observations, 28 futher X-ray sources
  80. EP240703b: GSP optical upper limit
  81. Fermi Gamma-ray Burst Monitor trigger 741911057/240705933 is not a GRB
  82. GRB 240705A: Fermi GBM Final Real-time Localization
  83. EP240703b: TRT optical upper limits
  84. EP240703a: TRT further optical observation
  85. EP240702a: TRT optical upper limits
  86. IPN triangulation of GRB 240628B (short)
  87. EP240703a: KAIT optical upper limit
  88. EP240703c: Kinder optical follow-up and Swift XRT observations
  89. EP240703a: Kinder optical follow-up observations
  90. EP240703c: EP-WXT detection of an X-ray transient
  91. EP240703a/GRB 240703A: TRT and JinShan decaying optical afterglow candidate
  92. The first three GRBs detected by SVOM: X-ray Upper Limits from EP-WXT
  93. EP240703b: EP-WXT detection of a fast X-ray transient
  94. EP240703a: EP-WXT detection of a fast X-ray transient
  95. EP240702a: GSP optical upper limit
  96. The first three GRBs detected by SVOM: GRB 240627B, GRB 240629A and GRB 240702A
  97. GRB 240702A: BALROG localization (Fermi Trigger / GRB 240702885)
  98. Fermi GRB 240702A: Global MASTER-Net observations report
  99. GRB 240702A: Fermi GBM Final Real-time Localization
  100. EP240702a: EP-WXT detection of a fast X-ray transient

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