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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"

37737 results found.

  1. Fermi trigger No 753166198: Global MASTER-Net observations report
  2. GRB 241105A: ATCA Radio Upper Limits
  3. GRB 241112B: AbAO optical upper limit
  4. GRB 241107A: GROWTH-India telescope optical upper limit
  5. Fermi GRB 241112A: Global MASTER-Net observations report
  6. Fermi-GBM Sub-Threshold Detection of GRB 241112B
  7. GRB 241112B: Optical afterglow detection confirmation in revisiting the Mephisto data
  8. GRB 241112B: Swift-XRT afterglow detection
  9. GRB 241112B: LCO optical detection of the SVOM/VT candidate
  10. GRB 241112B: SVOM/GRM observation
  11. GRB 241112B: SVOM/VT afterglow detection
  12. Fermi Gamma-ray Burst Monitor trigger 752995908/241111230 (GRB 241111A) is not a GRB
  13. GRB 241107A: Swift/BAT candidate arcminute localization of a short burst
  14. GRB 241112B: Mephisto optical upper limits
  15. GRB 241112B: GOTO optical upper limits
  16. GRB 241112B: Swift ToO observations
  17. GRB 241112B : detection of a long GRB by SVOM/ECLAIRs
  18. GRB 241107A: INTEGRAL IBIS localization
  19. GRB 241112A: Fermi GBM Final Real-time Localization
  20. GRB 241105A: VLT/FORS2 refined spectroscopic redshift z = 2.681
  21. IPN triangulation of GRB 241107A (short/hard)
  22. GRB 241107A: INTEGRAL/IBIS/PICsIT detection of a short burst
  23. GRB 241025C: VZLUSAT-2 detection
  24. GRB 241025A: VZLUSAT-2 detection
  25. GRB 241018A: cubesat Avion detection
  26. Fermi trigger No 752990530: Global MASTER-Net observations report
  27. GRB 241111A: Fermi GBM Final Real-time Localization
  28. GRB 241030B: TESS detection of optical counterpart
  29. Fermi trigger No 752878030: Global MASTER-Net observations report
  30. EP241109a: KAIT photometry and 3 m Shane spectroscopy from Lick observatory
  31. EP241107a: AbAO optical upper limit
  32. LIGO/Virgo/KAGRA S241109bn: Upper limits from Fermi-GBM Observations
  33. GRB 241108A: Further COLIBRÍ Upper Limits on the Optical Counterpart
  34. GRB 241108A: Swift-XRT observations
  35. EP241107A: MASTER optical observations of xray transient
  36. EP241107a: KAIT optical observations
  37. GRB 241108A: Swift ToO observations
  38. GRB 241030A: TESS observations
  39. GRB 241108A: COLIBRÍ Upper Limits on the Optical Counterpart
  40. GRB 241108A : a likely weak long GRB detected by SVOM/ECLAIRs
  41. GRB 241025A: radio detection with the VLA
  42. GRB 241104A: CALET Gamma-Ray Burst Monitor detection
  43. GRB 241107A: SVOM/GRM detection of a short burst
  44. GRB 241105A: EP-FXT follow-up observations
  45. GRB 241105A: SVOM/GRM observation
  46. GRB 241105a: PRIME near-infrared upper limits
  47. GRB 241105A: ePESSTO+ NTT optical afterglow detection
  48. GRB 241025A: LBT optical observations
  49. GRB241105A: Gemini-South Optical Afterglow Detection
  50. GRB 241105A: VLT/FORS2 optical afterglow rapid fading
  51. GRB 241105A: Swift/UVOT Detection
  52. EP241101a: CrAO ZTSH optical observations
  53. GRB 241105A: Swift/BAT-GUANO refined analysis of short burst with extended emission
  54. GRB 241030A: optical afterglow detection from the INAF Asiago Observatory
  55. GRB 241105A: BOOTES-7 optical detection
  56. GRB 241030A: Mondy optical observations
  57. GRB 241105A: Fermi GBM Observation of a Short Burst with Extended Emission
  58. Konus-Wind detection of GRB 241105A (short with extended emission)
  59. Konus-Wind detection of GRB 241021A
  60. GRB 241105A: SVOM/VT optical afterglow observations
  61. GRB 241105A: Swift-XRT afterglow detection
  62. GRB 241105A: VLT/FORS2 spectroscopic redshift z = 2.681
  63. GRB 241104A: Swift-XRT observations
  64. GRB 240511A: LCO upper limits
  65. GRB 241104A: Fermi GBM Observation
  66. GRB 241104A: The SVOM/VT candidate in GCN circular 38086 is not an astrophysical source
  67. GRB 241105A: Swift ToO observations
  68. GRB 241105A: Swift/BAT-GUANO arcminute localization of a short burst
  69. GRB 241104A: Swift ToO observations
  70. GRB 241104A: NOT optical non-detection
  71. GRB 241105A: GOTO tentative optical counterpart candidate
  72. Fermi GRB 241105A: Global MASTER-Net observations report
  73. GRB 241104A: SVOM/VT optical candidate
  74. GRB 241105A: Fermi GBM Final Real-time Localization
  75. GRB 241104A/EP241104a: Optical upper limits with Kinder observations
  76. GRB 241104A: COLIBRÍ Upper Limits on the Optical Counterpart
  77. GRB 241104A: SVOM/GRM observation
  78. EP241104a: EP detection of GRB 241104A X-ray emission
  79. GRB 241010A: host galaxy redshift z = 0.977
  80. GRB 241104A : Detection and localization by SVOM/ECLAIRs
  81. GRB 240821A: further radio observations with the VLA
  82. Fermi GRB 241104A: Global MASTER-Net observations report
  83. GRB 241104A: Fermi GBM Final Real-time Localization
  84. GRB 241030A: GRBAlpha detection
  85. Fermi trigger No 752365806: Global MASTER-Net observations report
  86. GRB 241030A: Swift-UVOT observations of the optical prompt flare
  87. GRB 241030A: Rapid release of TESS data.
  88. GRB 241029A: GRBAlpha detection
  89. Kinder optical follow-up observations of EP241021a, EP241026b, and EP241030a/GRB241030A
  90. GRB241030A: OHP/T193 optical observations
  91. EP241030a: Futher EP-FXT observation of the X-ray Afterglow of GRB 241030A
  92. Swift GRB 241101A: Global MASTER-Net observations report
  93. GRB 241101A: FRAM-ORM optical limit
  94. GRB 241030A/EP241030a: TNOT observations of the optical counterpart
  95. EP241021a: Upper limit from Konus-Wind observations
  96. GRB 241101A: Swift-BAT refined analysis
  97. GRB 241030A: further SAO RAS optical observations
  98. GRB 241030A: Optical Observations via Virtual Telescope Project
  99. GRB 241030B: Swift-XRT refined Analysis
  100. GRB 241026A: SAO RAS optical observations

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