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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').
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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"

32711 results found.

  1. LIGO/Virgo/KAGRA S241122a: Updated Sky localization and Source Classification
  2. GRB 241105A: ATCA radio detection
  3. LIGO/Virgo/KAGRA S241122a: Identification of a GW compact binary merger candidate
  4. IPN triangulation of GRB 241117A
  5. GRB 241026A: VIRT Optical Upper Limit
  6. GRB 241025A: VIRT Optical Upper Limit
  7. Konus-Wind detection of GRB 241120A
  8. GRB241120A: OHP/T193 optical observations
  9. GRB 241120A: CALET Gamma-Ray Burst Monitor detection
  10. EP241021a and EP241026b: Keck/LRIS spectroscopic observations
  11. EP trigger ID 01709065118: Keck/LRIS spectroscopic observations
  12. EP-WXT trigger 01709018832: Lick/Kast spectroscopy with the 3 m Shane telescope
  13. GRB 241120A: Mondy and AbAO optical observations
  14. EP241119a: Optical upper limits with Kinder observations
  15. EP241119a: GIT optical upper limits
  16. GRB 241113A: Possible ATCA Radio detection
  17. EP241119a : J-band observations with WINTER
  18. GRB 241120A: Fermi GBM Observation
  19. EP241119a: Global MASTER-Net observations report
  20. GRB241120A: a long GRB detected by INTEGRAL
  21. GRB 241115A: CALET Gamma-Ray Burst Monitor detection
  22. GRB 241112B: Mephisto further optical observations
  23. GRB 241030A: J-band observations
  24. GRB 241115a: PRIME near-infrared upper limits
  25. GRB 241117A: Swift/BAT-GUANO localization skymap of a burst
  26. GRB 241115B: Fermi GBM Observation
  27. LIGO/Virgo/KAGRA S241114y: Updated Sky localization
  28. Fermi GRB 241118A: Global MASTER-Net observations report
  29. Updates to IceCube realtime alert system for muon tracks
  30. GRB 241117A: SVOM/GRM observation of a short burst with extended emission
  31. Fermi GRB 241117B: Global MASTER-Net observations report
  32. LIGO/Virgo/KAGRA S241116cq: Updated Sky localization
  33. GRB 241115B: Swift/BAT-GUANO localization skymap of a long burst
  34. Fermi GRB 241117A: Global MASTER-Net observations report
  35. GRB 241115C: Fermi GBM Observation
  36. LIGO/Virgo/KAGRA S241116cq: Identification of a GW compact binary merger candidate
  37. EP241115a/GRB 241115D: Optical upper limits with Kinder observations
  38. GRB 241115A: Mephisto upper limits
  39. GRB 241113B: Mephisto upper limits
  40. EP241115a/GRB 241115D: Swift/XRT follow-up observation
  41. GRB 241115D / EP 241115a: SVOM/GRM observation
  42. The EP-WXT trigger 01709120856 is likely a flaring star
  43. EP241113a: Swift XRT weak detection
  44. GRB 241115A: Fermi GBM Observation
  45. GRB 241115A: LCOGT Optical Upper Limits
  46. Fermi GRB 241115B: Global MASTER-Net observations report
  47. LIGO/Virgo/KAGRA S241114bi: Updated Sky localization and EM Bright Classification
  48. EP241115a: Global MASTER-Net observations report
  49. LIGO/Virgo/KAGRA S241113p: Updated Sky localization
  50. EP241113a: No Detection in Fermi-GBM Observations
  51. Swift GRB 241115A: Global MASTER-Net observations report
  52. Fermi GRB 241115A: Global MASTER-Net observations report
  53. EP 241113a: LBT possible optical counterpart
  54. GRB 241113B: KAIT Optical Afterglow Candidate
  55. LIGO/Virgo/KAGRA S241114bi: Upper limits from Fermi-GBM Observations
  56. GRB 241113A: Swift-BAT refined analysis
  57. LIGO/Virgo/KAGRA S241114bi: Identification of a GW compact binary merger candidate
  58. GRB 241113A: PRIME near-infrared upper limits
  59. Fermi GRB 241114A: Global MASTER-Net observations report
  60. EP241113a: Global MASTER-Net observations report
  61. GRB 241113B: J-band upper limit from WINTER
  62. GRB 241113A: J-band observations with WINTER
  63. EP241113a : J-band observations with WINTER
  64. GRB 241030A: LCO optical observation
  65. IceCube-241113A: Upper limits from a search for additional neutrino events in IceCube
  66. GRB 241113A: 1.6m Mephisto and 50cm array optical upper limits
  67. GRB 241113A: KAIT optical observations
  68. EP241113b: Global MASTER-Net observations report
  69. EP241113b/GRB 241113B: EP detection of GRB 241113B
  70. Fermi-LAT gamma-ray observations of IceCube-241113A
  71. GRB 241113B: SVOM/GRM observation
  72. LIGO/Virgo/KAGRA S241114y: Identification of a GW compact binary merger candidate
  73. EP241107a: SOAR upper limits
  74. GRB 241113A: Swift/UVOT Detection
  75. GRB 241113A: REM detection of the optical/NIR afterglow
  76. Konus-Wind detection of GRB 241107A (short/hard)
  77. LIGO/Virgo/KAGRA S241113p: Identification of a GW compact binary merger candidate
  78. GRB 241113B: Swift ToO observations
  79. GRB 241113A: LCO optical observations
  80. GRB 241112B: GMG Optical Upper Limit
  81. GRB241113A: LCOGT (40-cm) optical counterpart detection
  82. GRB 241113A: MASTER010615.66-224018.2 optical counterpart detection
  83. SVOM/GRM detection of a short burst from SGR 1E1841-045
  84. LIGO/Virgo/KAGRA S241111bn: Updated Sky localization
  85. GRB 241105A: ATCA Radio Upper Limits
  86. GRB 241112B: AbAO optical upper limit
  87. GRB 241107A: GROWTH-India telescope optical upper limit
  88. Fermi GRB 241112A: Global MASTER-Net observations report
  89. Fermi-GBM Sub-Threshold Detection of GRB 241112B
  90. GRB 241112B: Optical afterglow detection confirmation in revisiting the Mephisto data
  91. GRB 241112B: LCO optical detection of the SVOM/VT candidate
  92. GRB 241112B: SVOM/GRM observation
  93. GRB 241112B: SVOM/VT afterglow detection
  94. Fermi Gamma-ray Burst Monitor trigger 752995908/241111230 (GRB 241111A) is not a GRB
  95. GRB 241107A: Swift/BAT candidate arcminute localization of a short burst
  96. GRB 241112B: Mephisto optical upper limits
  97. GRB 241112B: GOTO optical upper limits
  98. GRB 241112B: Swift ToO observations
  99. GRB 241107A: INTEGRAL IBIS localization
  100. EP241107a: EP-FXT follow-up observations

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