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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"

16119 results found.

  1. EP241119a: GIT optical upper limits
  2. GRB 241113A: Possible ATCA Radio detection
  3. GRB 241112B: Mephisto further optical observations
  4. GRB 241117A: SVOM/GRM observation of a short burst with extended emission
  5. EP241115a/GRB 241115D: Optical upper limits with Kinder observations
  6. GRB 241115A: Mephisto upper limits
  7. GRB 241113B: Mephisto upper limits
  8. GRB 241115D / EP 241115a: SVOM/GRM observation
  9. GRB 241115A: LCOGT Optical Upper Limits
  10. EP 241113a: LBT possible optical counterpart
  11. GRB 241113B: KAIT Optical Afterglow Candidate
  12. GRB 241113A: J-band observations with WINTER
  13. GRB 241030A: LCO optical observation
  14. GRB 241113A: 1.6m Mephisto and 50cm array optical upper limits
  15. GRB 241113A: KAIT optical observations
  16. GRB 241113B: SVOM/GRM observation
  17. EP241107a: SOAR upper limits
  18. GRB 241113A: REM detection of the optical/NIR afterglow
  19. GRB 241113A: LCO optical observations
  20. GRB 241112B: GMG Optical Upper Limit
  21. GRB241113A: LCOGT (40-cm) optical counterpart detection
  22. GRB 241113A: MASTER010615.66-224018.2 optical counterpart detection
  23. GRB 241113A: Swift detection of a burst with an optical counterpart
  24. SVOM/GRM detection of a short burst from SGR 1E1841-045
  25. GRB 241105A: ATCA Radio Upper Limits
  26. GRB 241112B: AbAO optical upper limit
  27. GRB 241107A: GROWTH-India telescope optical upper limit
  28. GRB 241112B: Optical afterglow detection confirmation in revisiting the Mephisto data
  29. GRB 241112B: LCO optical detection of the SVOM/VT candidate
  30. GRB 241112B: SVOM/GRM observation
  31. GRB 241112B: SVOM/VT afterglow detection
  32. GRB 241112B: Mephisto optical upper limits
  33. GRB 241112B: GOTO optical upper limits
  34. GRB 241030B: TESS detection of optical counterpart
  35. EP241107a: AbAO optical upper limit
  36. GRB 241108A: Further COLIBRÍ Upper Limits on the Optical Counterpart
  37. EP241107A: MASTER optical observations of xray transient
  38. EP241107a: KAIT optical observations
  39. GRB 241030A: TESS observations
  40. GRB 241108A: COLIBRÍ Upper Limits on the Optical Counterpart
  41. EP241107a: Kinder optical follow-up observations
  42. GRB 241025A: radio detection with the VLA
  43. EP241107a: AKO Optical Afterglow Follow-Up Observations
  44. EP241107a: GSP detects optical counterpart
  45. EP241107a: Gemini-South spectroscopic confirmation (z = 0.456)
  46. GRB 241105A: EP-FXT follow-up observations
  47. EP241107a: FTW Optical and NIR observations of the optical counterpart
  48. GRB 241105A: ePESSTO+ NTT optical afterglow detection
  49. EP241107a: GIT optical observations
  50. EP241107a: SVOM/C-GFT optical observations
  51. EP241107a: AKO Optical Afterglow Detection
  52. GRB 241025A: LBT optical observations
  53. GRB241105A: Gemini-South Optical Afterglow Detection
  54. GRB 241105A: VLT/FORS2 optical afterglow rapid fading
  55. GRB 241105A: Swift/UVOT Detection
  56. EP241101a: CrAO ZTSH optical observations
  57. GRB 241030A: optical afterglow detection from the INAF Asiago Observatory
  58. GRB 241105A: BOOTES-7 optical detection
  59. GRB 241030A: Mondy optical observations
  60. GRB 241105A: Fermi GBM Observation of a Short Burst with Extended Emission
  61. GRB 241105A: SVOM/VT optical afterglow observations
  62. GRB 241105A: Swift-XRT afterglow detection
  63. GRB 241105A: VLT/FORS2 spectroscopic redshift z = 2.681
  64. GRB 240511A: LCO upper limits
  65. GRB 241105A: Swift/BAT-GUANO arcminute localization of a short burst
  66. GRB 241104A: NOT optical non-detection
  67. GRB 241105A: GOTO tentative optical counterpart candidate
  68. GRB 241104A: SVOM/VT optical candidate
  69. GRB 241104A/EP241104a: Optical upper limits with Kinder observations
  70. GRB 241104A: COLIBRÍ Upper Limits on the Optical Counterpart
  71. GRB 241010A: host galaxy redshift z = 0.977
  72. EP241101a NUTTelA-TAO / BSTI Measurements 2024-11-02
  73. EP241101a: EP-FXT observations update
  74. EP241103a: GIT optical upper limit
  75. EP241021a: OHP/T193 further optical observations
  76. LIGO/Virgo/KAGRA S241102br: OHP/T193 optical observations
  77. EP241103a: GOTO optical upper limit
  78. EP241101a: Possible detection of an optical counterpart with FTW
  79. EP241021a: continued SOAR observations
  80. EP241101a: Optical upper limits with Kinder observations
  81. EP241101a: OHP/T193 optical observations
  82. EP241103a: Gemini optical limits
  83. GRB 241030A: Swift-UVOT observations of the optical prompt flare
  84. EP241103a: GSP optical upper limit
  85. EP241103A: LCO optical observations
  86. EP241101a: BOOTES-7 optical upper limit
  87. Kinder optical follow-up observations of EP241021a, EP241026b, and EP241030a/GRB241030A
  88. GRB241030A: OHP/T193 optical observations
  89. GRB 241101A: FRAM-ORM optical limit
  90. GRB 241030A/EP241030a: TNOT observations of the optical counterpart
  91. GRB 241030A: further SAO RAS optical observations
  92. GRB 241030A: Optical Observations via Virtual Telescope Project
  93. EP241021a: Liverpool Telescope optical follow-up observations
  94. GRB 241026A: SAO RAS optical observations
  95. GRB 241030A / EP241030a: GMG possible spectroscopic redshift at z ~ 1.4
  96. GRB 241030B: NUTTelA-TAO / BSTI Optical Limits (duplicate submission of 38023)
  97. GRB 241030B: NUTTelA-TAO / BSTI Optical Limits
  98. EP241021a: OHP/T193 optical observations
  99. GRB 241030A: Palomar 1-m telescope COSMOS optical observations
  100. GRB 241030B: Montarrenti Observatory optical upper limit

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