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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"

27240 results found.

  1. LIGO/Virgo/KAGRA S241114bi: Upper limits from Fermi-GBM Observations
  2. LIGO/Virgo/KAGRA S241114bi: Coverage and upper limits from MAXI/GSC observations
  3. GRB 241113A: Swift-BAT refined analysis
  4. Fermi GRB 241114A: Global MASTER-Net observations report
  5. EP241113a: Global MASTER-Net observations report
  6. GRB 241114A: Fermi GBM Final Real-time Localization
  7. GRB 241113B: J-band upper limit from WINTER
  8. GRB 241030A: LCO optical observation
  9. EP241113b: Global MASTER-Net observations report
  10. EP241113b/GRB 241113B: EP detection of GRB 241113B
  11. GRB 241113B: SVOM/GRM observation
  12. EP241113a: EP on-board trigger and autonomous follow-up observation
  13. GRB 241113A: Swift-XRT refined Analysis
  14. EP241107a: SOAR upper limits
  15. GRB 241113A: Swift/UVOT Detection
  16. GRB 241113A: REM detection of the optical/NIR afterglow
  17. Konus-Wind detection of GRB 241107A (short/hard)
  18. Fermi Gamma-ray Burst Monitor trigger 753166198/241113201 is not a GRB
  19. GRB 241113A: LCO optical observations
  20. GRB 241112B: GMG Optical Upper Limit
  21. GRB241113A: LCOGT (40-cm) optical counterpart detection
  22. GRB 241113B : detection of a long GRB by SVOM/ECLAIRs
  23. GRB 241113A: Swift detection of a burst with an optical counterpart
  24. Swift GRB241113.33: Global MASTER-Net observations report
  25. SVOM/GRM detection of a short burst from SGR 1E1841-045
  26. Fermi trigger No 753166198: Global MASTER-Net observations report
  27. GRB 241107A: GROWTH-India telescope optical upper limit
  28. IceCube Alert 241113.02: Global MASTER-Net observations report
  29. Fermi GRB 241112A: Global MASTER-Net observations report
  30. Fermi-GBM Sub-Threshold Detection of GRB 241112B
  31. GRB 241112B: Optical afterglow detection confirmation in revisiting the Mephisto data
  32. GRB 241112B: SVOM/GRM observation
  33. GRB 241112B: SVOM/VT afterglow detection
  34. Fermi Gamma-ray Burst Monitor trigger 752995908/241111230 (GRB 241111A) is not a GRB
  35. GRB 241107A: Swift/BAT candidate arcminute localization of a short burst
  36. GRB 241112B: Mephisto optical upper limits
  37. GRB 241112B: GOTO optical upper limits
  38. GRB 241112B : detection of a long GRB by SVOM/ECLAIRs
  39. GRB 241107A: INTEGRAL IBIS localization
  40. EP241107a: EP-FXT follow-up observations
  41. GRB 241112A: Fermi GBM Final Real-time Localization
  42. LIGO/Virgo/KAGRA S241109bn: ATLAS observations and discovery of the potential counterpart AT2024aawt
  43. IPN triangulation of GRB 241107A (short/hard)
  44. Fermi trigger No 752990530: Global MASTER-Net observations report
  45. GRB 241111A: Fermi GBM Final Real-time Localization
  46. GRB 241030B: TESS detection of optical counterpart
  47. LIGO/Virgo/KAGRA S241110bk: 1 counterpart neutrino candidate event from an IceCube neutrino search
  48. LIGO/Virgo/KAGRA S241109bn: Upper limits from EP-WXT observations
  49. Fermi trigger No 752878030: Global MASTER-Net observations report
  50. Integral GRB241109.89: Global MASTER-Net observations report
  51. LIGO/Virgo/KAGRA S241109bn: Coverage and upper limits from MAXI/GSC observations
  52. EP241109a: KAIT photometry and 3 m Shane spectroscopy from Lick observatory
  53. LIGO/Virgo/KAGRA S241109bn: Upper limits from Fermi-GBM Observations
  54. GRB 241108A: Further COLIBRÍ Upper Limits on the Optical Counterpart
  55. LIGO/Virgo/KAGRA S241109bn: Global MASTER-Net observations report
  56. EP241109a: confirmation of a stellar flare by BOOTES-7
  57. EP241109a: EP on-board trigger and autonomous follow-up observation
  58. EP241107a: KAIT optical observations
  59. GRB 241030A: TESS observations
  60. GRB 241108A: COLIBRÍ Upper Limits on the Optical Counterpart
  61. GRB 241108A : a likely weak long GRB detected by SVOM/ECLAIRs
  62. EP241107a: Kinder optical follow-up observations
  63. GRB 241104A: CALET Gamma-Ray Burst Monitor detection
  64. EP241107a: AKO Optical Afterglow Follow-Up Observations
  65. EP241107a: GSP detects optical counterpart
  66. EP241107a: Gemini-South spectroscopic confirmation (z = 0.456)
  67. GRB 241107A: SVOM/GRM detection of a short burst
  68. GRB 241105A: EP-FXT follow-up observations
  69. GRB 241105A: SVOM/GRM observation
  70. EP241107a: FTW Optical and NIR observations of the optical counterpart
  71. EP241107a: GIT optical observations
  72. EP241107a: Global MASTER-Net observations report
  73. EP241107a: SVOM/C-GFT optical observations
  74. EP241107a: AKO Optical Afterglow Detection
  75. GRB241105A: Gemini-South Optical Afterglow Detection
  76. EP241107a: EP on-board trigger and autonomous follow-up observation
  77. GRB 241105A: VLT/FORS2 optical afterglow rapid fading
  78. GRB 241105A: Swift/UVOT Detection
  79. GRB 241030A: optical afterglow detection from the INAF Asiago Observatory
  80. GRB 241105A: BOOTES-7 optical detection
  81. GRB 241105A: Fermi GBM Observation of a Short Burst with Extended Emission
  82. LIGO/Virgo/KAGRA S241106ba: 1 counterpart neutrino candidate event from an IceCube neutrino search
  83. LIGO/Virgo/KAGRA S241102o: 1 counterpart neutrino candidate event from an IceCube neutrino search
  84. GRB 241105A: SVOM/VT optical afterglow observations
  85. GRB 241105A: VLT/FORS2 spectroscopic redshift z = 2.681
  86. GRB 240511A: LCO upper limits
  87. GRB 241104A: Fermi GBM Observation
  88. GRB 241104A: The SVOM/VT candidate in GCN circular 38086 is not an astrophysical source
  89. GRB 241105A: Swift/BAT-GUANO arcminute localization of a short burst
  90. GRB 241104A: NOT optical non-detection
  91. GRB 241105A: GOTO tentative optical counterpart candidate
  92. Fermi GRB 241105A: Global MASTER-Net observations report
  93. GRB 241104A: SVOM/VT optical candidate
  94. GRB 241105A: Fermi GBM Final Real-time Localization
  95. GRB 241104A/EP241104a: Optical upper limits with Kinder observations
  96. GRB 241104A: COLIBRÍ Upper Limits on the Optical Counterpart
  97. GRB 241104A: SVOM/GRM observation
  98. EP241104a: EP detection of GRB 241104A X-ray emission
  99. GRB 241104A : Detection and localization by SVOM/ECLAIRs
  100. Fermi GRB 241104A: Global MASTER-Net observations report

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