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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

28121 results found.

  1. GRB 241117B: Fermi GBM Final Real-time Localization
  2. GRB 241117A: Fermi GBM Final Real-time Localization
  3. GRB 241115A: Swift-XRT afterglow detection
  4. EP241115a/GRB 241115D: Optical upper limits with Kinder observations
  5. GRB 241113B: Mephisto upper limits
  6. EP241115a/GRB 241115D: Swift/XRT follow-up observation
  7. EP241113a: Swift XRT weak detection
  8. GRB 241115A: LCOGT Optical Upper Limits
  9. GRB 241115B: Fermi GBM Final Real-time Localization
  10. EP241115a: EP detection of a fast X-ray transient
  11. EP241113a: No Detection in Fermi-GBM Observations
  12. GRB 241115A: Swift detection of a burst
  13. GRB 241115A: Fermi GBM Final Real-time Localization
  14. EP 241113a: LBT possible optical counterpart
  15. GRB 241113B: KAIT Optical Afterglow Candidate
  16. LIGO/Virgo/KAGRA S241114bi: Upper limits from Fermi-GBM Observations
  17. GRB 241113A: PRIME near-infrared upper limits
  18. GRB 241114A: Fermi GBM Final Real-time Localization
  19. GRB 241113A: J-band observations with WINTER
  20. GRB 241030A: LCO optical observation
  21. GRB 241113B: Swift-XRT observations
  22. GRB 241113A: 1.6m Mephisto and 50cm array optical upper limits
  23. GRB 241113A: KAIT optical observations
  24. EP241113b/GRB 241113B: EP detection of GRB 241113B
  25. EP241113a: EP on-board trigger and autonomous follow-up observation
  26. GRB 241113A: Swift-XRT refined Analysis
  27. GRB 241113A: Swift/UVOT Detection
  28. GRB 241113A: REM detection of the optical/NIR afterglow
  29. Konus-Wind detection of GRB 241107A (short/hard)
  30. GRB 241113B: Swift ToO observations
  31. IceCube-241113A - IceCube observation of a high-energy neutrino candidate track-like event
  32. GRB 241113A: Enhanced Swift-XRT position
  33. GRB241113A: LCOGT (40-cm) optical counterpart detection
  34. GRB 241113B : detection of a long GRB by SVOM/ECLAIRs
  35. GRB 241113A: MASTER010615.66-224018.2 optical counterpart detection
  36. GRB 241113A: Swift detection of a burst with an optical counterpart
  37. SVOM/GRM detection of a short burst from SGR 1E1841-045
  38. GRB 241112B: AbAO optical upper limit
  39. Fermi-GBM Sub-Threshold Detection of GRB 241112B
  40. GRB 241112B: Optical afterglow detection confirmation in revisiting the Mephisto data
  41. GRB 241112B: Swift-XRT afterglow detection
  42. GRB 241112B: LCO optical detection of the SVOM/VT candidate
  43. GRB 241112B: SVOM/VT afterglow detection
  44. GRB 241112B: Swift ToO observations
  45. GRB 241112B : detection of a long GRB by SVOM/ECLAIRs
  46. GRB 241112A: Fermi GBM Final Real-time Localization
  47. GRB 241105A: VLT/FORS2 refined spectroscopic redshift z = 2.681
  48. IPN triangulation of GRB 241107A (short/hard)
  49. GRB 241107A: INTEGRAL/IBIS/PICsIT detection of a short burst
  50. GRB 241025C: VZLUSAT-2 detection
  51. GRB 241025A: VZLUSAT-2 detection
  52. GRB 241018A: cubesat Avion detection
  53. GRB 241111A: Fermi GBM Final Real-time Localization
  54. GRB 241030B: TESS detection of optical counterpart
  55. INTEGRAL detection of a burst from 1E 1841-045
  56. EP241107a: AbAO optical upper limit
  57. LIGO/Virgo/KAGRA S241109bn: Upper limits from Fermi-GBM Observations
  58. GRB 241108A: Further COLIBRÍ Upper Limits on the Optical Counterpart
  59. EP241109a: confirmation of a stellar flare by BOOTES-7
  60. EP241109a: EP on-board trigger and autonomous follow-up observation
  61. GRB 241108A: Swift-XRT observations
  62. EP241107A: MASTER optical observations of xray transient
  63. EP241107a: KAIT optical observations
  64. GRB 241108A: Swift ToO observations
  65. GRB 241030A: TESS observations
  66. GRB 241108A : a likely weak long GRB detected by SVOM/ECLAIRs
  67. EP241107a: Kinder optical follow-up observations
  68. GRB 241025A: radio detection with the VLA
  69. GRB 241104A: CALET Gamma-Ray Burst Monitor detection
  70. EP241107a: AKO Optical Afterglow Follow-Up Observations
  71. EP241107a: GSP detects optical counterpart
  72. EP241107a: Gemini-South spectroscopic confirmation (z = 0.456)
  73. GRB 241107A: SVOM/GRM detection of a short burst
  74. GRB 241105A: EP-FXT follow-up observations
  75. EP241107a: OHP/T193 photometric and spectroscopic observations
  76. GRB 241105a: PRIME near-infrared upper limits
  77. GRB 241105A: ePESSTO+ NTT optical afterglow detection
  78. EP241107a: GIT optical observations
  79. EP241107a: AKO Optical Afterglow Detection
  80. GRB 241025A: LBT optical observations
  81. GRB241105A: Gemini-South Optical Afterglow Detection
  82. EP241107a: EP on-board trigger and autonomous follow-up observation
  83. GRB 241105A: VLT/FORS2 optical afterglow rapid fading
  84. GRB 241105A: Swift/UVOT Detection
  85. GRB 241105A: Swift/BAT-GUANO refined analysis of short burst with extended emission
  86. GRB 241030A: optical afterglow detection from the INAF Asiago Observatory
  87. GRB 241105A: BOOTES-7 optical detection
  88. GRB 241030A: Mondy optical observations
  89. GRB 241105A: Fermi GBM Observation of a Short Burst with Extended Emission
  90. Konus-Wind detection of GRB 241105A (short with extended emission)
  91. Konus-Wind detection of GRB 241021A
  92. GRB 241105A: SVOM/VT optical afterglow observations
  93. GRB 241105A: Swift-XRT afterglow detection
  94. GRB 241105A: VLT/FORS2 spectroscopic redshift z = 2.681
  95. GRB 241104A: Swift-XRT observations
  96. GRB 240511A: LCO upper limits
  97. GRB 241105A: Swift ToO observations
  98. GRB 241105A: Swift/BAT-GUANO arcminute localization of a short burst
  99. GRB 241104A: Swift ToO observations
  100. GRB 241104A: NOT optical non-detection

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