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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"

23685 results found.

  1. LIGO/Virgo/KAGRA S241127aj: NED Galaxies in the Localization Volume
  2. EP241126a: Optical Upper limits with Kinder observations
  3. EP241126a: EP-FXT follow-up observation update
  4. EP241126a: GSP detects optical counterpart
  5. EP241126a: TRT optical counterpart detection
  6. LIGO/Virgo/KAGRA S241127aj: Identification of a GW compact binary merger candidate
  7. EP241126a: EP detection of a fast X-ray transient
  8. LIGO/Virgo/KAGRA S241125n: COLIBRÍ Upper Limits on Optical Counterparts to Two of the Swift/XRT Sources
  9. GRB 241113B: EP-FXT afterglow detection
  10. LIGO/Virgo/KAGRA S241125n: DDOTI Optical Upper Limits
  11. LIGO/Virgo S241125n: Swift XRT observations, 5 X-ray sources
  12. Konus-Wind detection of GRB 241115D / EP 241115a
  13. LIGO/Virgo/KAGRA S241125n: Upper limits from Konus-Wind observations
  14. GRB 241026A: radio detection with the VLA
  15. EP241125a: Optical upper limit with Kinder observations
  16. LIGO/Virgo/KAGRA S241125n: COLIBRÍ Upper Limits on a Optical Counterpart at the BAT Position
  17. LIGO/Virgo/KAGRA S241125n: Kinder optical upper limit in the BAT error region
  18. GRB 241120A: GRBAlpha detection
  19. GRB 241113B: SVOM/VT optical afterglow observations
  20. LIGO/Virgo/KAGRA S241125n: Identification of a GW compact binary merger candidate
  21. Konus-Wind detection of GRB 241117A
  22. IPN triangulation of GRB 241117A
  23. Konus-Wind detection of GRB 241120A
  24. GRB241120A: OHP/T193 optical observations
  25. GRB 241120A: CALET Gamma-Ray Burst Monitor detection
  26. EP241021a and EP241026b: Keck/LRIS spectroscopic observations
  27. EP trigger ID 01709065118: Keck/LRIS spectroscopic observations
  28. EP-WXT trigger 01709018832: Lick/Kast spectroscopy with the 3 m Shane telescope
  29. EP241119a: Optical upper limits with Kinder observations
  30. EP trigger ID 01709122294: the X-ray transient is likely a stellar flare event
  31. EP241119a : J-band observations with WINTER
  32. GRB 241115A: CALET Gamma-Ray Burst Monitor detection
  33. GRB 241115A: Swift-XRT afterglow detection
  34. LIGO/Virgo/KAGRA S241116cq: Identification of a GW compact binary merger candidate
  35. EP241115a/GRB 241115D: Optical upper limits with Kinder observations
  36. GRB 241113B: Mephisto upper limits
  37. EP241115a/GRB 241115D: Swift/XRT follow-up observation
  38. The EP-WXT trigger 01709120856 is likely a flaring star
  39. GRB 241115A: Fermi GBM Observation
  40. EP241115a: EP detection of a fast X-ray transient
  41. EP241113a: No Detection in Fermi-GBM Observations
  42. Swift GRB 241115A: Global MASTER-Net observations report
  43. GRB 241115A: Swift detection of a burst
  44. GRB 241113B: KAIT Optical Afterglow Candidate
  45. LIGO/Virgo/KAGRA S241114bi: Coverage and upper limits from MAXI/GSC observations
  46. GRB 241113A: Swift-BAT refined analysis
  47. LIGO/Virgo/KAGRA S241114bi: Identification of a GW compact binary merger candidate
  48. GRB 241113B: J-band upper limit from WINTER
  49. GRB 241113A: J-band observations with WINTER
  50. EP241113a : J-band observations with WINTER
  51. GRB 241030A: LCO optical observation
  52. GRB 241113B: Swift-XRT observations
  53. GRB 241113A: 1.6m Mephisto and 50cm array optical upper limits
  54. GRB 241113A: KAIT optical observations
  55. EP241113b: Global MASTER-Net observations report
  56. EP241113b/GRB 241113B: EP detection of GRB 241113B
  57. Fermi-LAT gamma-ray observations of IceCube-241113A
  58. EP241113a: EP on-board trigger and autonomous follow-up observation
  59. LIGO/Virgo/KAGRA S241114y: Identification of a GW compact binary merger candidate
  60. GRB 241113A: Swift-XRT refined Analysis
  61. GRB 241113A: Swift/UVOT Detection
  62. GRB 241113A: REM detection of the optical/NIR afterglow
  63. Konus-Wind detection of GRB 241107A (short/hard)
  64. GRB 241113A: LCO optical observations
  65. GRB 241112B: GMG Optical Upper Limit
  66. GRB241113A: LCOGT (40-cm) optical counterpart detection
  67. GRB 241113A: Swift detection of a burst with an optical counterpart
  68. GRB 241112B: Swift-XRT afterglow detection
  69. GRB 241112B: SVOM/VT afterglow detection
  70. GRB 241112B: Mephisto optical upper limits
  71. GRB 241112B: GOTO optical upper limits
  72. LIGO/Virgo/KAGRA S241110br: NED Galaxies in the Localization Volume
  73. LIGO/Virgo/KAGRA S241109bn: ATLAS observations and discovery of the potential counterpart AT2024aawt
  74. LIGO/Virgo/KAGRA S241111bn: Identification of a GW compact binary merger candidate
  75. IPN triangulation of GRB 241107A (short/hard)
  76. GRB 241025C: VZLUSAT-2 detection
  77. GRB 241025A: VZLUSAT-2 detection
  78. GRB 241018A: cubesat Avion detection
  79. LIGO/Virgo/KAGRA S241110bk: 1 counterpart neutrino candidate event from an IceCube neutrino search
  80. LIGO/Virgo/KAGRA S241110br: Identification of a GW compact binary merger candidate
  81. LIGO/Virgo/KAGRA S241109bn: Upper limits from EP-WXT observations
  82. LIGO/Virgo/KAGRA S241109bn: Coverage and upper limits from MAXI/GSC observations
  83. EP241109a: KAIT photometry and 3 m Shane spectroscopy from Lick observatory
  84. GRB 241108A: Further COLIBRÍ Upper Limits on the Optical Counterpart
  85. EP241109a: confirmation of a stellar flare by BOOTES-7
  86. GRB 241108A: Swift-XRT observations
  87. EP241107a: KAIT optical observations
  88. GRB 241108A: COLIBRÍ Upper Limits on the Optical Counterpart
  89. EP241107a: Kinder optical follow-up observations
  90. GRB 241025A: radio detection with the VLA
  91. GRB 241104A: CALET Gamma-Ray Burst Monitor detection
  92. EP241107a: GSP detects optical counterpart
  93. EP241107a: OHP/T193 photometric and spectroscopic observations
  94. GRB 241105A: ePESSTO+ NTT optical afterglow detection
  95. GRB 241105A: Swift/UVOT Detection
  96. GRB 241105A: Swift/BAT-GUANO refined analysis of short burst with extended emission
  97. GRB 241030A: optical afterglow detection from the INAF Asiago Observatory
  98. GRB 241105A: BOOTES-7 optical detection
  99. Konus-Wind detection of GRB 241105A (short with extended emission)
  100. LIGO/Virgo/KAGRA S241106ba: 1 counterpart neutrino candidate event from an IceCube neutrino search

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