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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"

27268 results found.

  1. Fermi trigger No 743418632: Global MASTER-Net observations report
  2. Fermi trigger No 743315411: Global MASTER-Net observations report
  3. LIGO/Virgo/KAGRA S240716b: Upper limits from Swift/BAT-GUANO
  4. LIGO/Virgo/KAGRA S240703ad: Upper limits from Swift/BAT-GUANO
  5. Fermi trigger No 743345551: Global MASTER-Net observations report
  6. Fermi Gamma-ray Burst Monitor trigger 743271526/240721680 is not a GRB
  7. Fermi trigger No 743219692: Global MASTER-Net observations report
  8. IceCube Alert 240721.68: Global MASTER-Net observations report
  9. Fermi Gamma-ray Burst Monitor trigger 743243582/240721356 (GRB 240721A) is not a GRB
  10. GRB 240720B: SVOM/GRM observation
  11. GRB 240721A: Fermi GBM Final Real-time Localization
  12. GRB 240720B: AstroSat CZTI detection of a short burst
  13. Fermi GRB 240720A: Global MASTER-Net observations report
  14. GRB 240720A: AstroSat CZTI detection
  15. GRB 240720A: Fermi GBM observation
  16. GRB 240720A: Swift detection of a burst
  17. Swift GRB240720.02: Global MASTER-Net observations report
  18. GRB 240713A: SVOM/GRM observation
  19. Fermi GRB 240718A: Global MASTER-Net observations report
  20. LAT GRB240718.27: Global MASTER-Net observations report
  21. GRB 240718A: Fermi GBM Observation
  22. GRB 240718A: Fermi-LAT Detection
  23. GRB 240718A: SVOM/GRM observation
  24. GRB 240718A: BALROG localization (Fermi Trigger 742976945 / GRB 240718270)
  25. GRB 240718A: Fermi GBM Final Real-time Localization
  26. GRB 240712A: Swift-BAT refined analysis
  27. GRB 240716A: GECAM-B detection of a long burst
  28. SVOM/GRM In-Flight Trigger of GRB 240716A
  29. IceCube-Cascade 240714A: X-ray follow-up observation with EP-FXT
  30. GRB 240713A: 2.2m CAHA optical limit
  31. GRB 240715A: Swift/UVOT observations of the XRT sources.
  32. GRB240713A: Swift/UVOT Upper LImits
  33. GRB 240715A: GECAM-C detection of a short burst
  34. Konus-Wind detection of GRB 240715A
  35. GRB 240715A: TRT optical upper limit on one Swift/XRT candidate
  36. GRB 240712A: Swift-XRT refined Analysis
  37. SVOM/GRM In-Flight Trigger of GRB 240715A
  38. Fermi GRB 240715A: Global MASTER-Net observations report
  39. GRB 240715A: Fermi GBM Observation
  40. GRB240715A: GRANDMA Optical Upper Limits
  41. IPN triangulation of GRB 240715A (short)
  42. GRB 240712A: Swift/UVOT Upper Limits
  43. EP-WXT flaring star and the optical flaring activity during its decay phase
  44. JinShan confirmation of the EP-WXT source triggered on July 14th due to a flaring star
  45. The EP-WXT source triggered on July 14th is likely a flaring star
  46. GRB 240715A: Fermi GBM Final Real-time Localization
  47. GRB 240713A: J-band upper limit from WINTER
  48. GRB 240713A: NOT optical upper limits on three EP/FXT candidates
  49. GRB 240713A: JinShan optical upper limits
  50. GRB 240713A: OHP/T120 optical upper limit
  51. GRB240713A: X-ray follow-up observation with EP-FXT
  52. GRB240713A: Optical upper limit with Kinder observations
  53. Fermi Sub-threshold Observation of GRB240713A
  54. GRB240713A: TAROT and GRANDMA Observations of SVOM/ECLAIRs GRB240713A
  55. GRB240713A : The first probable GRB Located on-Board SVOM by ECLAIRs
  56. Fermi Gamma-ray Burst Monitor trigger 742413075/240711744 is not a GRB
  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. GRB 240711A: Fermi GBM Final Real-time Localization
  61. Fermi trigger No 742405878: Global MASTER-Net observations report
  62. Fermi trigger No 742317942: Global MASTER-Net observations report
  63. EP240708a: KAIT optical upper limit
  64. Fermi GRB 240710A: Global MASTER-Net observations report
  65. GRB 240710A: Fermi GBM Final Real-time Localization
  66. EP240708a: NOT optical observations
  67. EP240708a: SVOM/C-GFT optical upper limit
  68. EP240708a: X-ray follow-up observations with EP/FXT and Swift/XRT
  69. EP240708a: Optical upper limits with Kinder observations
  70. EP240708a: EP-WXT detection of a fast X-ray transient
  71. LIGO/Virgo S240615dg: Swift XRT observations, 28 futher X-ray sources
  72. EP240703b: GSP optical upper limit
  73. Fermi Gamma-ray Burst Monitor trigger 741911057/240705933 is not a GRB
  74. GRB 240705A: Fermi GBM Final Real-time Localization
  75. EP240703b: TRT optical upper limits
  76. EP240703a: TRT further optical observation
  77. EP240702a: TRT optical upper limits
  78. IPN triangulation of GRB 240628B (short)
  79. EP240703a: KAIT optical upper limit
  80. EP240703c: Kinder optical follow-up and Swift XRT observations
  81. EP240703a: Kinder optical follow-up observations
  82. EP240703c: EP-WXT detection of an X-ray transient
  83. EP240703a/GRB 240703A: TRT and JinShan decaying optical afterglow candidate
  84. The first three GRBs detected by SVOM: X-ray Upper Limits from EP-WXT
  85. EP240703b: EP-WXT detection of a fast X-ray transient
  86. EP240703a: EP-WXT detection of a fast X-ray transient
  87. EP240702a: GSP optical upper limit
  88. The first three GRBs detected by SVOM: GRB 240627B, GRB 240629A and GRB 240702A
  89. GRB 240702A: BALROG localization (Fermi Trigger / GRB 240702885)
  90. Fermi GRB 240702A: Global MASTER-Net observations report
  91. GRB 240702A: Fermi GBM Final Real-time Localization
  92. EP240702a: EP-WXT detection of a fast X-ray transient
  93. LIGO/Virgo/KAGRA S240627by: Upper limits from Swift/BAT-GUANO
  94. Fermi Gamma-ray Burst Monitor trigger 741448122/240630575 is not a GRB
  95. GRB 240627A: CALET Gamma-Ray Burst Monitor detection
  96. Fermi trigger No 741448122: Global MASTER-Net observations report
  97. LIGO/Virgo/KAGRA S240629by: Upper limits from Fermi-GBM Observations
  98. LIGO/Virgo/KAGRA S240629by: Coverage and upper limits from MAXI/GSC observations
  99. Fermi trigger No 741356809: Global MASTER-Net observations report
  100. Fermi GRB 240629A: Global MASTER-Net observations report

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