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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"

28201 results found.

  1. GRB 241113B: Swift-XRT observations
  2. GRB 241113A: 1.6m Mephisto and 50cm array optical upper limits
  3. GRB 241113A: KAIT optical observations
  4. EP241113b/GRB 241113B: EP detection of GRB 241113B
  5. EP241113a: EP on-board trigger and autonomous follow-up observation
  6. GRB 241113A: Swift-XRT refined Analysis
  7. GRB 241113A: Swift/UVOT Detection
  8. GRB 241113A: REM detection of the optical/NIR afterglow
  9. Konus-Wind detection of GRB 241107A (short/hard)
  10. GRB 241113B: Swift ToO observations
  11. IceCube-241113A - IceCube observation of a high-energy neutrino candidate track-like event
  12. GRB 241113A: Enhanced Swift-XRT position
  13. GRB241113A: LCOGT (40-cm) optical counterpart detection
  14. GRB 241113B : detection of a long GRB by SVOM/ECLAIRs
  15. GRB 241113A: MASTER010615.66-224018.2 optical counterpart detection
  16. GRB 241113A: Swift detection of a burst with an optical counterpart
  17. SVOM/GRM detection of a short burst from SGR 1E1841-045
  18. GRB 241112B: AbAO optical upper limit
  19. Fermi-GBM Sub-Threshold Detection of GRB 241112B
  20. GRB 241112B: Optical afterglow detection confirmation in revisiting the Mephisto data
  21. GRB 241112B: Swift-XRT afterglow detection
  22. GRB 241112B: LCO optical detection of the SVOM/VT candidate
  23. GRB 241112B: SVOM/VT afterglow detection
  24. GRB 241112B: Swift ToO observations
  25. GRB 241112B : detection of a long GRB by SVOM/ECLAIRs
  26. GRB 241112A: Fermi GBM Final Real-time Localization
  27. GRB 241105A: VLT/FORS2 refined spectroscopic redshift z = 2.681
  28. IPN triangulation of GRB 241107A (short/hard)
  29. GRB 241107A: INTEGRAL/IBIS/PICsIT detection of a short burst
  30. GRB 241025C: VZLUSAT-2 detection
  31. GRB 241025A: VZLUSAT-2 detection
  32. GRB 241018A: cubesat Avion detection
  33. GRB 241111A: Fermi GBM Final Real-time Localization
  34. GRB 241030B: TESS detection of optical counterpart
  35. INTEGRAL detection of a burst from 1E 1841-045
  36. EP241107a: AbAO optical upper limit
  37. LIGO/Virgo/KAGRA S241109bn: Upper limits from Fermi-GBM Observations
  38. GRB 241108A: Further COLIBRÍ Upper Limits on the Optical Counterpart
  39. EP241109a: confirmation of a stellar flare by BOOTES-7
  40. EP241109a: EP on-board trigger and autonomous follow-up observation
  41. GRB 241108A: Swift-XRT observations
  42. EP241107A: MASTER optical observations of xray transient
  43. EP241107a: KAIT optical observations
  44. GRB 241108A: Swift ToO observations
  45. GRB 241030A: TESS observations
  46. GRB 241108A : a likely weak long GRB detected by SVOM/ECLAIRs
  47. EP241107a: Kinder optical follow-up observations
  48. GRB 241025A: radio detection with the VLA
  49. GRB 241104A: CALET Gamma-Ray Burst Monitor detection
  50. EP241107a: AKO Optical Afterglow Follow-Up Observations
  51. EP241107a: GSP detects optical counterpart
  52. EP241107a: Gemini-South spectroscopic confirmation (z = 0.456)
  53. GRB 241107A: SVOM/GRM detection of a short burst
  54. GRB 241105A: EP-FXT follow-up observations
  55. EP241107a: OHP/T193 photometric and spectroscopic observations
  56. GRB 241105a: PRIME near-infrared upper limits
  57. GRB 241105A: ePESSTO+ NTT optical afterglow detection
  58. EP241107a: GIT optical observations
  59. EP241107a: AKO Optical Afterglow Detection
  60. GRB 241025A: LBT optical observations
  61. GRB241105A: Gemini-South Optical Afterglow Detection
  62. EP241107a: EP on-board trigger and autonomous follow-up observation
  63. GRB 241105A: VLT/FORS2 optical afterglow rapid fading
  64. GRB 241105A: Swift/UVOT Detection
  65. GRB 241105A: Swift/BAT-GUANO refined analysis of short burst with extended emission
  66. GRB 241030A: optical afterglow detection from the INAF Asiago Observatory
  67. GRB 241105A: BOOTES-7 optical detection
  68. GRB 241030A: Mondy optical observations
  69. GRB 241105A: Fermi GBM Observation of a Short Burst with Extended Emission
  70. Konus-Wind detection of GRB 241105A (short with extended emission)
  71. Konus-Wind detection of GRB 241021A
  72. GRB 241105A: SVOM/VT optical afterglow observations
  73. GRB 241105A: Swift-XRT afterglow detection
  74. GRB 241105A: VLT/FORS2 spectroscopic redshift z = 2.681
  75. GRB 241104A: Swift-XRT observations
  76. GRB 240511A: LCO upper limits
  77. GRB 241105A: Swift ToO observations
  78. GRB 241105A: Swift/BAT-GUANO arcminute localization of a short burst
  79. GRB 241104A: Swift ToO observations
  80. GRB 241104A: NOT optical non-detection
  81. GRB 241104A: SVOM/VT optical candidate
  82. GRB 241105A: Fermi GBM Final Real-time Localization
  83. EP241104a: EP detection of GRB 241104A X-ray emission
  84. GRB 241010A: host galaxy redshift z = 0.977
  85. EP241101a NUTTelA-TAO / BSTI Measurements 2024-11-02
  86. GRB 241104A : Detection and localization by SVOM/ECLAIRs
  87. GRB 241104A: Fermi GBM Final Real-time Localization
  88. GRB 241030A: GRBAlpha detection
  89. EP241101a: EP-FXT observations update
  90. EP241103a: GIT optical upper limit
  91. LIGO/Virgo/KAGRA S241104a: Retraction of GW compact binary merger candidate
  92. EP241103a: GOTO optical upper limit
  93. EP241101a: Possible detection of an optical counterpart with FTW
  94. EP241103a: Swift XRT detection and improved X-ray position
  95. EP241101a: OHP/T193 optical observations
  96. LIGO/Virgo/KAGRA S241102br: MASTER observations and OT detection
  97. LIGO/Virgo/KAGRA S241102br: EP-WXT X-ray follow-up and flux limits
  98. GRB 241030A: Swift-UVOT observations of the optical prompt flare
  99. EP241103a: GSP optical upper limit
  100. EP241103a: an X-ray transient detected by Einstein Probe

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