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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"

32740 results found.

  1. EP241107a: SOAR upper limits
  2. GRB 241113A: Swift/UVOT Detection
  3. GRB 241113A: REM detection of the optical/NIR afterglow
  4. Konus-Wind detection of GRB 241107A (short/hard)
  5. LIGO/Virgo/KAGRA S241113p: Identification of a GW compact binary merger candidate
  6. GRB 241113B: Swift ToO observations
  7. GRB 241113A: LCO optical observations
  8. GRB 241112B: GMG Optical Upper Limit
  9. GRB241113A: LCOGT (40-cm) optical counterpart detection
  10. GRB 241113A: MASTER010615.66-224018.2 optical counterpart detection
  11. SVOM/GRM detection of a short burst from SGR 1E1841-045
  12. LIGO/Virgo/KAGRA S241111bn: Updated Sky localization
  13. GRB 241105A: ATCA Radio Upper Limits
  14. GRB 241112B: AbAO optical upper limit
  15. GRB 241107A: GROWTH-India telescope optical upper limit
  16. Fermi GRB 241112A: Global MASTER-Net observations report
  17. Fermi-GBM Sub-Threshold Detection of GRB 241112B
  18. GRB 241112B: Optical afterglow detection confirmation in revisiting the Mephisto data
  19. GRB 241112B: LCO optical detection of the SVOM/VT candidate
  20. GRB 241112B: SVOM/GRM observation
  21. GRB 241112B: SVOM/VT afterglow detection
  22. Fermi Gamma-ray Burst Monitor trigger 752995908/241111230 (GRB 241111A) is not a GRB
  23. GRB 241107A: Swift/BAT candidate arcminute localization of a short burst
  24. GRB 241112B: Mephisto optical upper limits
  25. GRB 241112B: GOTO optical upper limits
  26. GRB 241112B: Swift ToO observations
  27. GRB 241107A: INTEGRAL IBIS localization
  28. EP241107a: EP-FXT follow-up observations
  29. LIGO/Virgo/KAGRA S241109bn: ATLAS observations and discovery of the potential counterpart AT2024aawt
  30. GRB 241105A: VLT/FORS2 refined spectroscopic redshift z = 2.681
  31. LIGO/Virgo/KAGRA S241111bn: Identification of a GW compact binary merger candidate
  32. IPN triangulation of GRB 241107A (short/hard)
  33. GRB 241107A: INTEGRAL/IBIS/PICsIT detection of a short burst
  34. GRB 241025C: VZLUSAT-2 detection
  35. GRB 241025A: VZLUSAT-2 detection
  36. GRB 241018A: cubesat Avion detection
  37. GRB 241030B: TESS detection of optical counterpart
  38. LIGO/Virgo/KAGRA S241110br: Updated Sky localization
  39. LIGO/Virgo/KAGRA S241110br: Identification of a GW compact binary merger candidate
  40. LIGO/Virgo/KAGRA S241109bn: Upper limits from EP-WXT observations
  41. LIGO/Virgo/KAGRA S241109bn: Coverage and upper limits from MAXI/GSC observations
  42. EP241109a: KAIT photometry and 3 m Shane spectroscopy from Lick observatory
  43. LIGO/Virgo/KAGRA S241109bn: Updated Sky localization and EM Bright Classification
  44. EP241107a: AbAO optical upper limit
  45. LIGO/Virgo/KAGRA S241109bn: Upper limits from Fermi-GBM Observations
  46. GRB 241108A: Further COLIBRÍ Upper Limits on the Optical Counterpart
  47. LIGO/Virgo/KAGRA S241109p: Updated Sky localization and Source Classification
  48. LIGO/Virgo/KAGRA S241109bn: Identification of a GW compact binary merger candidate
  49. EP241109a: confirmation of a stellar flare by BOOTES-7
  50. LIGO/Virgo/KAGRA S241109p: Identification of a GW compact binary merger candidate
  51. EP241107A: MASTER optical observations of xray transient
  52. EP241107a: KAIT optical observations
  53. GRB 241108A: Swift ToO observations
  54. GRB 241030A: TESS observations
  55. GRB 241108A: COLIBRÍ Upper Limits on the Optical Counterpart
  56. EP241107a: Kinder optical follow-up observations
  57. GRB 241025A: radio detection with the VLA
  58. GRB 241104A: CALET Gamma-Ray Burst Monitor detection
  59. EP241107a: AKO Optical Afterglow Follow-Up Observations
  60. EP241107a: GSP detects optical counterpart
  61. EP241107a: Gemini-South spectroscopic confirmation (z = 0.456)
  62. GRB 241105A: EP-FXT follow-up observations
  63. GRB 241105A: SVOM/GRM observation
  64. EP241107a: OHP/T193 photometric and spectroscopic observations
  65. GRB 241105a: PRIME near-infrared upper limits
  66. EP241107a: FTW Optical and NIR observations of the optical counterpart
  67. GRB 241105A: ePESSTO+ NTT optical afterglow detection
  68. EP241107a: GIT optical observations
  69. EP241107a: Global MASTER-Net observations report
  70. EP241107a: SVOM/C-GFT optical observations
  71. EP241107a: AKO Optical Afterglow Detection
  72. GRB 241025A: LBT optical observations
  73. GRB241105A: Gemini-South Optical Afterglow Detection
  74. GRB 241105A: VLT/FORS2 optical afterglow rapid fading
  75. GRB 241105A: Swift/UVOT Detection
  76. EP241101a: CrAO ZTSH optical observations
  77. GRB 241105A: Swift/BAT-GUANO refined analysis of short burst with extended emission
  78. GRB 241030A: optical afterglow detection from the INAF Asiago Observatory
  79. GRB 241030A: Mondy optical observations
  80. GRB 241105A: Fermi GBM Observation of a Short Burst with Extended Emission
  81. Konus-Wind detection of GRB 241105A (short with extended emission)
  82. Konus-Wind detection of GRB 241021A
  83. GRB 241105A: SVOM/VT optical afterglow observations
  84. GRB 241105A: Swift-XRT afterglow detection
  85. GRB 241105A: VLT/FORS2 spectroscopic redshift z = 2.681
  86. GRB 241104A: Swift-XRT observations
  87. GRB 240511A: LCO upper limits
  88. GRB 241104A: Fermi GBM Observation
  89. GRB 241104A: The SVOM/VT candidate in GCN circular 38086 is not an astrophysical source
  90. GRB 241105A: Swift ToO observations
  91. GRB 241105A: Swift/BAT-GUANO arcminute localization of a short burst
  92. GRB 241104A: Swift ToO observations
  93. GRB 241104A: NOT optical non-detection
  94. GRB 241105A: GOTO tentative optical counterpart candidate
  95. Fermi GRB 241105A: Global MASTER-Net observations report
  96. GRB 241104A: SVOM/VT optical candidate
  97. GRB 241104A/EP241104a: Optical upper limits with Kinder observations
  98. GRB 241104A: COLIBRÍ Upper Limits on the Optical Counterpart
  99. GRB 241104A: SVOM/GRM observation
  100. EP241104a: EP detection of GRB 241104A X-ray emission

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