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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"

45727 results found.

  1. GRB 241115C: Fermi GBM Observation
  2. GRB 241115A: Swift-XRT afterglow detection
  3. LIGO/Virgo/KAGRA S241116cq: Identification of a GW compact binary merger candidate
  4. EP241115a/GRB 241115D: Optical upper limits with Kinder observations
  5. GRB 241115A: Mephisto upper limits
  6. GRB 241113B: Mephisto upper limits
  7. EP241115a/GRB 241115D: Swift/XRT follow-up observation
  8. GRB 241115D / EP 241115a: SVOM/GRM observation
  9. The EP-WXT trigger 01709120856 is likely a flaring star
  10. EP241113a: Swift XRT weak detection
  11. GRB 241115A: Fermi GBM Observation
  12. GRB 241115A: LCOGT Optical Upper Limits
  13. GRB 241115C: Swift/BAT-GUANO localization skymap of a burst
  14. Fermi GRB 241115B: Global MASTER-Net observations report
  15. LIGO/Virgo/KAGRA S241114bi: Updated Sky localization and EM Bright Classification
  16. EP241115a: Global MASTER-Net observations report
  17. GRB 241115B: Fermi GBM Final Real-time Localization
  18. LIGO/Virgo/KAGRA S241113p: Updated Sky localization
  19. EP241115a: EP detection of a fast X-ray transient
  20. EP241113a: No Detection in Fermi-GBM Observations
  21. Swift GRB 241115A: Global MASTER-Net observations report
  22. Fermi GRB 241115A: Global MASTER-Net observations report
  23. GRB 241115A: Swift detection of a burst
  24. GRB 241115A: Fermi GBM Final Real-time Localization
  25. EP 241113a: LBT possible optical counterpart
  26. GRB 241113B: KAIT Optical Afterglow Candidate
  27. LIGO/Virgo/KAGRA S241114bi: Upper limits from Fermi-GBM Observations
  28. LIGO/Virgo/KAGRA S241114bi: Coverage and upper limits from MAXI/GSC observations
  29. GRB 241113A: Swift-BAT refined analysis
  30. LIGO/Virgo/KAGRA S241114bi: Identification of a GW compact binary merger candidate
  31. GRB 241113A: PRIME near-infrared upper limits
  32. Fermi GRB 241114A: Global MASTER-Net observations report
  33. EP241113a: Global MASTER-Net observations report
  34. GRB 241114A: Fermi GBM Final Real-time Localization
  35. GRB 241113B: J-band upper limit from WINTER
  36. GRB 241113A: J-band observations with WINTER
  37. EP241113a : J-band observations with WINTER
  38. GRB 241030A: LCO optical observation
  39. GRB 241113B: Swift-XRT observations
  40. IceCube-241113A: Upper limits from a search for additional neutrino events in IceCube
  41. GRB 241113A: 1.6m Mephisto and 50cm array optical upper limits
  42. GRB 241113A: KAIT optical observations
  43. EP241113b: Global MASTER-Net observations report
  44. EP241113b/GRB 241113B: EP detection of GRB 241113B
  45. Fermi-LAT gamma-ray observations of IceCube-241113A
  46. GRB 241113B: SVOM/GRM observation
  47. EP241113a: EP on-board trigger and autonomous follow-up observation
  48. LIGO/Virgo/KAGRA S241114y: Identification of a GW compact binary merger candidate
  49. GRB 241113A: Swift-XRT refined Analysis
  50. EP241107a: SOAR upper limits
  51. GRB 241113A: Swift/UVOT Detection
  52. GRB 241113A: REM detection of the optical/NIR afterglow
  53. Konus-Wind detection of GRB 241107A (short/hard)
  54. LIGO/Virgo/KAGRA S241113p: Identification of a GW compact binary merger candidate
  55. Fermi Gamma-ray Burst Monitor trigger 753166198/241113201 is not a GRB
  56. GRB 241113B: Swift ToO observations
  57. GRB 241113A: LCO optical observations
  58. IceCube-241113A - IceCube observation of a high-energy neutrino candidate track-like event
  59. GRB 241112B: GMG Optical Upper Limit
  60. GRB 241113A: Enhanced Swift-XRT position
  61. GRB241113A: LCOGT (40-cm) optical counterpart detection
  62. GRB 241113B : detection of a long GRB by SVOM/ECLAIRs
  63. GRB 241113A: MASTER010615.66-224018.2 optical counterpart detection
  64. GRB 241113A: Swift detection of a burst with an optical counterpart
  65. Swift GRB241113.33: Global MASTER-Net observations report
  66. SVOM/GRM detection of a short burst from SGR 1E1841-045
  67. Fermi trigger No 753166198: Global MASTER-Net observations report
  68. LIGO/Virgo/KAGRA S241111bn: Updated Sky localization
  69. GRB 241105A: ATCA Radio Upper Limits
  70. GRB 241112B: AbAO optical upper limit
  71. GRB 241107A: GROWTH-India telescope optical upper limit
  72. IceCube Alert 241113.02: Global MASTER-Net observations report
  73. Fermi GRB 241112A: Global MASTER-Net observations report
  74. Fermi-GBM Sub-Threshold Detection of GRB 241112B
  75. GRB 241112B: Optical afterglow detection confirmation in revisiting the Mephisto data
  76. GRB 241112B: Swift-XRT afterglow detection
  77. GRB 241112B: LCO optical detection of the SVOM/VT candidate
  78. GRB 241112B: SVOM/GRM observation
  79. GRB 241112B: SVOM/VT afterglow detection
  80. Fermi Gamma-ray Burst Monitor trigger 752995908/241111230 (GRB 241111A) is not a GRB
  81. GRB 241107A: Swift/BAT candidate arcminute localization of a short burst
  82. GRB 241112B: Mephisto optical upper limits
  83. GRB 241112B: GOTO optical upper limits
  84. GRB 241112B: Swift ToO observations
  85. GRB 241112B : detection of a long GRB by SVOM/ECLAIRs
  86. GRB 241107A: INTEGRAL IBIS localization
  87. EP241107a: EP-FXT follow-up observations
  88. GRB 241112A: Fermi GBM Final Real-time Localization
  89. LIGO/Virgo/KAGRA S241110br: NED Galaxies in the Localization Volume
  90. LIGO/Virgo/KAGRA S241109bn: ATLAS observations and discovery of the potential counterpart AT2024aawt
  91. GRB 241105A: VLT/FORS2 refined spectroscopic redshift z = 2.681
  92. LIGO/Virgo/KAGRA S241111bn: Identification of a GW compact binary merger candidate
  93. IPN triangulation of GRB 241107A (short/hard)
  94. GRB 241107A: INTEGRAL/IBIS/PICsIT detection of a short burst
  95. GRB 241025C: VZLUSAT-2 detection
  96. GRB 241025A: VZLUSAT-2 detection
  97. GRB 241018A: cubesat Avion detection
  98. Fermi trigger No 752990530: Global MASTER-Net observations report
  99. GRB 241111A: Fermi GBM Final Real-time Localization
  100. GRB 241030B: TESS detection of optical counterpart

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