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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"

37729 results found.

  1. IPN triangulation of GRB 241114B
  2. GRB 241113B: EP-FXT afterglow detection
  3. Konus-Wind detection of GRB 241115D / EP 241115a
  4. LIGO/Virgo/KAGRA S241125n: Upper limits from Konus-Wind observations
  5. GRB 241026A: radio detection with the VLA
  6. LIGO/Virgo/KAGRA S241125n: Upper limits from Fermi-GBM Observations
  7. LIGO/Virgo/KAGRA S241125n: Updated Coincidence with External Event
  8. LIGO/Virgo/KAGRA S241125n: No counterpart candidates in INTEGRAL SPI-ACS prompt observation, comparisong with Swift/BAT counterpart
  9. LIGO/Virgo/KAGRA S241125n: Updated Sky localization and Coincidence with External Event
  10. LIGO/Virgo/KAGRA S241125n: Swift/BAT-GUANO candidate counterpart
  11. GRB 241120A: GRBAlpha detection
  12. GRB 241113B: SVOM/VT optical afterglow observations
  13. Konus-Wind detection of GRB 241117A
  14. GRB 241105A: ATCA radio detection
  15. IPN triangulation of GRB 241117A
  16. GRB 241026A: VIRT Optical Upper Limit
  17. GRB 241025A: VIRT Optical Upper Limit
  18. Konus-Wind detection of GRB 241120A
  19. GRB241120A: OHP/T193 optical observations
  20. GRB 241120A: CALET Gamma-Ray Burst Monitor detection
  21. EP241021a and EP241026b: Keck/LRIS spectroscopic observations
  22. EP trigger ID 01709065118: Keck/LRIS spectroscopic observations
  23. EP-WXT trigger 01709018832: Lick/Kast spectroscopy with the 3 m Shane telescope
  24. GRB 241120A: Mondy and AbAO optical observations
  25. GRB 241113A: Possible ATCA Radio detection
  26. GRB 241120A: Fermi GBM Observation
  27. GRB 241114B: Insight-HXMT/HE detection
  28. GRB241120A: a long GRB detected by INTEGRAL
  29. GRB 241120A: Fermi GBM Final Real-time Localization
  30. GRB 241115A: CALET Gamma-Ray Burst Monitor detection
  31. GRB 241112B: Mephisto further optical observations
  32. GRB 241119A: Fermi GBM Final Real-time Localization
  33. GRB 241030A: J-band observations
  34. GRB 241115a: PRIME near-infrared upper limits
  35. GRB 241117A: Swift/BAT-GUANO localization skymap of a burst
  36. LIGO/Virgo/KAGRA S241116cq: Upper limits from Swift/BAT-GUANO
  37. GRB 241115B: Fermi GBM Observation
  38. Fermi GRB 241118A: Global MASTER-Net observations report
  39. GRB 241118A: Fermi GBM Final Real-time Localization
  40. GRB 241117A: SVOM/GRM observation of a short burst with extended emission
  41. GRB 241117A: Fermi GBM Detection
  42. Fermi GRB 241117B: Global MASTER-Net observations report
  43. GRB 241117B: Fermi GBM Final Real-time Localization
  44. GRB 241115B: Swift/BAT-GUANO localization skymap of a long burst
  45. Fermi GRB 241117A: Global MASTER-Net observations report
  46. GRB 241117A: Fermi GBM Final Real-time Localization
  47. GRB 241115C: Fermi GBM Observation
  48. GRB 241115A: Swift-XRT afterglow detection
  49. EP241115a/GRB 241115D: Optical upper limits with Kinder observations
  50. GRB 241115A: Mephisto upper limits
  51. GRB 241113B: Mephisto upper limits
  52. EP241115a/GRB 241115D: Swift/XRT follow-up observation
  53. GRB 241115D / EP 241115a: SVOM/GRM observation
  54. GRB 241115A: Fermi GBM Observation
  55. GRB 241115A: LCOGT Optical Upper Limits
  56. GRB 241115C: Swift/BAT-GUANO localization skymap of a burst
  57. Fermi GRB 241115B: Global MASTER-Net observations report
  58. GRB 241115B: Fermi GBM Final Real-time Localization
  59. EP241113a: No Detection in Fermi-GBM Observations
  60. Swift GRB 241115A: Global MASTER-Net observations report
  61. Fermi GRB 241115A: Global MASTER-Net observations report
  62. GRB 241115A: Swift detection of a burst
  63. GRB 241115A: Fermi GBM Final Real-time Localization
  64. GRB 241113B: KAIT Optical Afterglow Candidate
  65. LIGO/Virgo/KAGRA S241114bi: Upper limits from Fermi-GBM Observations
  66. GRB 241113A: Swift-BAT refined analysis
  67. GRB 241113A: PRIME near-infrared upper limits
  68. Fermi GRB 241114A: Global MASTER-Net observations report
  69. GRB 241114A: Fermi GBM Final Real-time Localization
  70. GRB 241113B: J-band upper limit from WINTER
  71. GRB 241113A: J-band observations with WINTER
  72. GRB 241030A: LCO optical observation
  73. GRB 241113B: Swift-XRT observations
  74. GRB 241113A: 1.6m Mephisto and 50cm array optical upper limits
  75. GRB 241113A: KAIT optical observations
  76. EP241113b/GRB 241113B: EP detection of GRB 241113B
  77. Fermi-LAT gamma-ray observations of IceCube-241113A
  78. GRB 241113B: SVOM/GRM observation
  79. GRB 241113A: Swift-XRT refined Analysis
  80. GRB 241113A: Swift/UVOT Detection
  81. GRB 241113A: REM detection of the optical/NIR afterglow
  82. Konus-Wind detection of GRB 241107A (short/hard)
  83. Fermi Gamma-ray Burst Monitor trigger 753166198/241113201 is not a GRB
  84. GRB 241113B: Swift ToO observations
  85. GRB 241113A: LCO optical observations
  86. IceCube-241113A - IceCube observation of a high-energy neutrino candidate track-like event
  87. GRB 241112B: GMG Optical Upper Limit
  88. GRB 241113A: Enhanced Swift-XRT position
  89. GRB241113A: LCOGT (40-cm) optical counterpart detection
  90. GRB 241113B : detection of a long GRB by SVOM/ECLAIRs
  91. GRB 241113A: MASTER010615.66-224018.2 optical counterpart detection
  92. GRB 241113A: Swift detection of a burst with an optical counterpart
  93. Fermi trigger No 753166198: Global MASTER-Net observations report
  94. GRB 241105A: ATCA Radio Upper Limits
  95. GRB 241112B: AbAO optical upper limit
  96. GRB 241107A: GROWTH-India telescope optical upper limit
  97. Fermi GRB 241112A: Global MASTER-Net observations report
  98. Fermi-GBM Sub-Threshold Detection of GRB 241112B
  99. GRB 241112B: Optical afterglow detection confirmation in revisiting the Mephisto data
  100. GRB 241112B: Swift-XRT afterglow detection

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