Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

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"

32686 results found.

  1. GRB 241115B: Fermi GBM Observation
  2. LIGO/Virgo/KAGRA S241114y: Updated Sky localization
  3. Fermi GRB 241118A: Global MASTER-Net observations report
  4. Updates to IceCube realtime alert system for muon tracks
  5. GRB 241117A: SVOM/GRM observation of a short burst with extended emission
  6. Fermi GRB 241117B: Global MASTER-Net observations report
  7. LIGO/Virgo/KAGRA S241116cq: Updated Sky localization
  8. GRB 241115B: Swift/BAT-GUANO localization skymap of a long burst
  9. Fermi GRB 241117A: Global MASTER-Net observations report
  10. GRB 241115C: Fermi GBM Observation
  11. LIGO/Virgo/KAGRA S241116cq: Identification of a GW compact binary merger candidate
  12. EP241115a/GRB 241115D: Optical upper limits with Kinder observations
  13. GRB 241115A: Mephisto upper limits
  14. GRB 241113B: Mephisto upper limits
  15. EP241115a/GRB 241115D: Swift/XRT follow-up observation
  16. GRB 241115D / EP 241115a: SVOM/GRM observation
  17. The EP-WXT trigger 01709120856 is likely a flaring star
  18. EP241113a: Swift XRT weak detection
  19. GRB 241115A: Fermi GBM Observation
  20. GRB 241115A: LCOGT Optical Upper Limits
  21. Fermi GRB 241115B: Global MASTER-Net observations report
  22. LIGO/Virgo/KAGRA S241114bi: Updated Sky localization and EM Bright Classification
  23. EP241115a: Global MASTER-Net observations report
  24. LIGO/Virgo/KAGRA S241113p: Updated Sky localization
  25. EP241113a: No Detection in Fermi-GBM Observations
  26. Swift GRB 241115A: Global MASTER-Net observations report
  27. Fermi GRB 241115A: Global MASTER-Net observations report
  28. EP 241113a: LBT possible optical counterpart
  29. GRB 241113B: KAIT Optical Afterglow Candidate
  30. LIGO/Virgo/KAGRA S241114bi: Upper limits from Fermi-GBM Observations
  31. GRB 241113A: Swift-BAT refined analysis
  32. LIGO/Virgo/KAGRA S241114bi: Identification of a GW compact binary merger candidate
  33. GRB 241113A: PRIME near-infrared upper limits
  34. Fermi GRB 241114A: Global MASTER-Net observations report
  35. EP241113a: Global MASTER-Net observations report
  36. GRB 241113B: J-band upper limit from WINTER
  37. GRB 241113A: J-band observations with WINTER
  38. EP241113a : J-band observations with WINTER
  39. GRB 241030A: LCO optical observation
  40. IceCube-241113A: Upper limits from a search for additional neutrino events in IceCube
  41. GRB 241113A: 1.6m Mephisto and 50cm array optical upper limits
  42. GRB 241113A: KAIT optical observations
  43. EP241113b: Global MASTER-Net observations report
  44. EP241113b/GRB 241113B: EP detection of GRB 241113B
  45. Fermi-LAT gamma-ray observations of IceCube-241113A
  46. GRB 241113B: SVOM/GRM observation
  47. LIGO/Virgo/KAGRA S241114y: Identification of a GW compact binary merger candidate
  48. EP241107a: SOAR upper limits
  49. GRB 241113A: Swift/UVOT Detection
  50. GRB 241113A: REM detection of the optical/NIR afterglow
  51. Konus-Wind detection of GRB 241107A (short/hard)
  52. LIGO/Virgo/KAGRA S241113p: Identification of a GW compact binary merger candidate
  53. GRB 241113B: Swift ToO observations
  54. GRB 241113A: LCO optical observations
  55. GRB 241112B: GMG Optical Upper Limit
  56. GRB241113A: LCOGT (40-cm) optical counterpart detection
  57. GRB 241113A: MASTER010615.66-224018.2 optical counterpart detection
  58. SVOM/GRM detection of a short burst from SGR 1E1841-045
  59. LIGO/Virgo/KAGRA S241111bn: Updated Sky localization
  60. GRB 241105A: ATCA Radio Upper Limits
  61. GRB 241112B: AbAO optical upper limit
  62. GRB 241107A: GROWTH-India telescope optical upper limit
  63. Fermi GRB 241112A: Global MASTER-Net observations report
  64. Fermi-GBM Sub-Threshold Detection of GRB 241112B
  65. GRB 241112B: Optical afterglow detection confirmation in revisiting the Mephisto data
  66. GRB 241112B: LCO optical detection of the SVOM/VT candidate
  67. GRB 241112B: SVOM/GRM observation
  68. GRB 241112B: SVOM/VT afterglow detection
  69. Fermi Gamma-ray Burst Monitor trigger 752995908/241111230 (GRB 241111A) is not a GRB
  70. GRB 241107A: Swift/BAT candidate arcminute localization of a short burst
  71. GRB 241112B: Mephisto optical upper limits
  72. GRB 241112B: GOTO optical upper limits
  73. GRB 241112B: Swift ToO observations
  74. GRB 241107A: INTEGRAL IBIS localization
  75. EP241107a: EP-FXT follow-up observations
  76. LIGO/Virgo/KAGRA S241109bn: ATLAS observations and discovery of the potential counterpart AT2024aawt
  77. GRB 241105A: VLT/FORS2 refined spectroscopic redshift z = 2.681
  78. LIGO/Virgo/KAGRA S241111bn: Identification of a GW compact binary merger candidate
  79. IPN triangulation of GRB 241107A (short/hard)
  80. GRB 241107A: INTEGRAL/IBIS/PICsIT detection of a short burst
  81. GRB 241025C: VZLUSAT-2 detection
  82. GRB 241025A: VZLUSAT-2 detection
  83. GRB 241018A: cubesat Avion detection
  84. GRB 241030B: TESS detection of optical counterpart
  85. LIGO/Virgo/KAGRA S241110br: Updated Sky localization
  86. LIGO/Virgo/KAGRA S241110br: Identification of a GW compact binary merger candidate
  87. LIGO/Virgo/KAGRA S241109bn: Upper limits from EP-WXT observations
  88. LIGO/Virgo/KAGRA S241109bn: Coverage and upper limits from MAXI/GSC observations
  89. EP241109a: KAIT photometry and 3 m Shane spectroscopy from Lick observatory
  90. LIGO/Virgo/KAGRA S241109bn: Updated Sky localization and EM Bright Classification
  91. EP241107a: AbAO optical upper limit
  92. LIGO/Virgo/KAGRA S241109bn: Upper limits from Fermi-GBM Observations
  93. GRB 241108A: Further COLIBRÍ Upper Limits on the Optical Counterpart
  94. LIGO/Virgo/KAGRA S241109p: Updated Sky localization and Source Classification
  95. LIGO/Virgo/KAGRA S241109bn: Identification of a GW compact binary merger candidate
  96. EP241109a: confirmation of a stellar flare by BOOTES-7
  97. LIGO/Virgo/KAGRA S241109p: Identification of a GW compact binary merger candidate
  98. EP241107A: MASTER optical observations of xray transient
  99. EP241107a: KAIT optical observations
  100. GRB 241108A: Swift ToO observations

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov