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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"

36353 results found.

  1. GRB 241120A: Mondy and AbAO optical observations
  2. GRB 241113A: Possible ATCA Radio detection
  3. GRB 241120A: Fermi GBM Observation
  4. GRB 241114B: Insight-HXMT/HE detection
  5. GRB241120A: a long GRB detected by INTEGRAL
  6. GRB 241120A: Fermi GBM Final Real-time Localization
  7. GRB 241115A: CALET Gamma-Ray Burst Monitor detection
  8. GRB 241112B: Mephisto further optical observations
  9. GRB 241119A: Fermi GBM Final Real-time Localization
  10. GRB 241030A: J-band observations
  11. GRB 241115a: PRIME near-infrared upper limits
  12. GRB 241117A: Swift/BAT-GUANO localization skymap of a burst
  13. LIGO/Virgo/KAGRA S241116cq: Upper limits from Swift/BAT-GUANO
  14. GRB 241115B: Fermi GBM Observation
  15. Fermi GRB 241118A: Global MASTER-Net observations report
  16. GRB 241118A: Fermi GBM Final Real-time Localization
  17. Updates to IceCube realtime alert system for muon tracks
  18. GRB 241117A: SVOM/GRM observation of a short burst with extended emission
  19. GRB 241117A: Fermi GBM Detection
  20. Fermi GRB 241117B: Global MASTER-Net observations report
  21. GRB 241117B: Fermi GBM Final Real-time Localization
  22. GRB 241115B: Swift/BAT-GUANO localization skymap of a long burst
  23. Fermi GRB 241117A: Global MASTER-Net observations report
  24. GRB 241117A: Fermi GBM Final Real-time Localization
  25. GRB 241115C: Fermi GBM Observation
  26. GRB 241115A: Swift-XRT afterglow detection
  27. EP241115a/GRB 241115D: Optical upper limits with Kinder observations
  28. GRB 241115A: Mephisto upper limits
  29. GRB 241113B: Mephisto upper limits
  30. EP241115a/GRB 241115D: Swift/XRT follow-up observation
  31. GRB 241115D / EP 241115a: SVOM/GRM observation
  32. GRB 241115A: Fermi GBM Observation
  33. GRB 241115A: LCOGT Optical Upper Limits
  34. GRB 241115C: Swift/BAT-GUANO localization skymap of a burst
  35. Fermi GRB 241115B: Global MASTER-Net observations report
  36. GRB 241115B: Fermi GBM Final Real-time Localization
  37. EP241113a: No Detection in Fermi-GBM Observations
  38. Swift GRB 241115A: Global MASTER-Net observations report
  39. Fermi GRB 241115A: Global MASTER-Net observations report
  40. GRB 241115A: Swift detection of a burst
  41. GRB 241115A: Fermi GBM Final Real-time Localization
  42. GRB 241113B: KAIT Optical Afterglow Candidate
  43. LIGO/Virgo/KAGRA S241114bi: Upper limits from Fermi-GBM Observations
  44. GRB 241113A: Swift-BAT refined analysis
  45. GRB 241113A: PRIME near-infrared upper limits
  46. Fermi GRB 241114A: Global MASTER-Net observations report
  47. GRB 241114A: Fermi GBM Final Real-time Localization
  48. GRB 241113B: J-band upper limit from WINTER
  49. GRB 241113A: J-band observations with WINTER
  50. GRB 241030A: LCO optical observation
  51. GRB 241113B: Swift-XRT observations
  52. IceCube-241113A: Upper limits from a search for additional neutrino events in IceCube
  53. GRB 241113A: 1.6m Mephisto and 50cm array optical upper limits
  54. GRB 241113A: KAIT optical observations
  55. EP241113b/GRB 241113B: EP detection of GRB 241113B
  56. GRB 241113B: SVOM/GRM observation
  57. GRB 241113A: Swift-XRT refined Analysis
  58. GRB 241113A: Swift/UVOT Detection
  59. GRB 241113A: REM detection of the optical/NIR afterglow
  60. Konus-Wind detection of GRB 241107A (short/hard)
  61. Fermi Gamma-ray Burst Monitor trigger 753166198/241113201 is not a GRB
  62. GRB 241113B: Swift ToO observations
  63. GRB 241113A: LCO optical observations
  64. GRB 241112B: GMG Optical Upper Limit
  65. GRB 241113A: Enhanced Swift-XRT position
  66. GRB241113A: LCOGT (40-cm) optical counterpart detection
  67. GRB 241113B : detection of a long GRB by SVOM/ECLAIRs
  68. GRB 241113A: MASTER010615.66-224018.2 optical counterpart detection
  69. GRB 241113A: Swift detection of a burst with an optical counterpart
  70. GRB 241105A: ATCA Radio Upper Limits
  71. GRB 241112B: AbAO optical upper limit
  72. GRB 241107A: GROWTH-India telescope optical upper limit
  73. Fermi GRB 241112A: Global MASTER-Net observations report
  74. Fermi-GBM Sub-Threshold Detection of GRB 241112B
  75. GRB 241112B: Optical afterglow detection confirmation in revisiting the Mephisto data
  76. GRB 241112B: Swift-XRT afterglow detection
  77. GRB 241112B: LCO optical detection of the SVOM/VT candidate
  78. GRB 241112B: SVOM/GRM observation
  79. GRB 241112B: SVOM/VT afterglow detection
  80. Fermi Gamma-ray Burst Monitor trigger 752995908/241111230 (GRB 241111A) is not a GRB
  81. GRB 241107A: Swift/BAT candidate arcminute localization of a short burst
  82. GRB 241112B: Mephisto optical upper limits
  83. GRB 241112B: GOTO optical upper limits
  84. GRB 241112B: Swift ToO observations
  85. GRB 241112B : detection of a long GRB by SVOM/ECLAIRs
  86. GRB 241107A: INTEGRAL IBIS localization
  87. GRB 241112A: Fermi GBM Final Real-time Localization
  88. GRB 241105A: VLT/FORS2 refined spectroscopic redshift z = 2.681
  89. IPN triangulation of GRB 241107A (short/hard)
  90. GRB 241107A: INTEGRAL/IBIS/PICsIT detection of a short burst
  91. GRB 241025C: VZLUSAT-2 detection
  92. GRB 241025A: VZLUSAT-2 detection
  93. GRB 241018A: cubesat Avion detection
  94. GRB 241111A: Fermi GBM Final Real-time Localization
  95. GRB 241030B: TESS detection of optical counterpart
  96. EP241109a: KAIT photometry and 3 m Shane spectroscopy from Lick observatory
  97. EP241107a: AbAO optical upper limit
  98. LIGO/Virgo/KAGRA S241109bn: Upper limits from Fermi-GBM Observations
  99. GRB 241108A: Further COLIBRÍ Upper Limits on the Optical Counterpart
  100. EP241109a: confirmation of a stellar flare by BOOTES-7

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